S-8337/8338 Series
www.ablic.com
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL
SWITCHING REGULATOR CONTROLLER
© ABLIC Inc., 2003-2019
Rev.5.0_00
The S-8337/8338 Series is a CMOS step-up switching regulator which mainly consists of a reference voltage
circuit, an oscillator, an error amplifier, a PWM controller, an under voltage lockout circuit (UVLO), and a timer
latch short-circuit protection circuit. Because its minimum operating voltage is as low as 1.8 V, this switching
regulator is ideal for the power supply of an LCD or for portable systems that operate on a low voltage. The
internal oscillation frequency can be set up to 1.133 MHz, via the resistor connected to the ROSC pin.
With the S-8337 Series, the maximum duty ratio of PWM control can be controlled by the resistor connected to
the RDuty pin. With the S-8338 Series, the maximum duty ratio is fixed (to 88%). The phase compensation
and gain value can be adjusted according to the values of the resistor and capacitor connected to the CC pin.
Therefore, the operation stability and transient response can be correctly set for each application. The
reference voltage accuracy is as high as 1.0 V±1.5%, and any voltage can be output by using an external
output voltage setting resistor.
In addition, the delay time of the short-circuit protection circuit can be set by using the capacitor connected to
the CSP pin. If the maximum duty condition continues because of short-circuiting, the capacitor externally
connected to the CSP pin is charged, and oscillation stops after a specific time. This condition is cleared by
re-application of power or by setting the switching regulator (S-8338 Series) to the shutdown status. A ceramic
capacitor or a tantalum capacitor is used as the output capacitor, depending on the setting. This controller IC
allows various settings and selections and employs a small package, making it very easy to use.
Features
1.8 V to 6.0 V
286 kHz to 1.133 MHz (selectable by external resistor)
47 to 88.5% (selectable by external resistor) (S-8337 Series)
Fixed to 88% typ. (S-8338 Series)
Reference voltage:
1.0 V±1.5%
UVLO (under-voltage lockout) function:
Detection voltage can be selected from between 1.5 V and 2.3 V in 0.1 V steps.
Hysteresis width can be selected from between 0.1 V and 0.3 V in 0.1 V steps.
Timer latch short-circuit protection circuit:
Delay time can be set using an external capacitor.
Soft-start time can be selected in three steps, 10 ms, 15 ms, and 20 ms.
Soft-start function:
Phase compensation external setting:
Adjustable by connecting resistor and capacitor in series to GND.
Shutdown function:
S-8338 Series, shutdown current consumption: 1.0 μA max.
Lead-free, Sn 100%, halogen-free*1
• Low voltage operation:
• Oscillation frequency:
• Maximum duty:
•
•
•
•
•
•
•
*1. Refer to “ Product Name Structure” for details.
Applications
• Power supplies for LCDs and CCDs
• Power supplies for portable equipment
Package
• 8-Pin TSSOP
1
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
S-8337/8338 Series
Rev.5.0_00
Block Diagram
SD
RDuty (S-8337) or
ON/OFF (S-8338)
L
VIN
ROSC
UVLO
M1
CIN
VOUT
+
PWM −
comparator
EXT
Timer latch
short-circuit
protection circuit
VSS
CSP
+
Error amplifier
−
Reference voltage
(1.0 V) soft-start
circuit
CC
RZ CZ
Figure 1 Block Diagram
2
CFB RFB1
Oscillator
Maximum duty circuit
CL
FB
RFB2
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.5.0_00
S-8337/8338 Series
Product Name Structure
S-833 x A x
x
x
-
T8T1
x
Environmental code
U: Lead-free (Sn 100%), halogen-free
G: Lead-free (for details, please contact our sales representatives.)
Package name (abbreviation) and packing specification
T8T1: 8-Pin TSSOP, tape
Soft-start time setting
A: 10 ms
B: 15 ms
C: 20 ms
UVLO setting
A: 2.3 V
B: 2.2 V
C: 2.1 V
D: 2.0 V
E: 1.9 V
F: 1.8 V
G: 1.7 V
H: 1.6 V
I: 1.5 V
UVLO hysteresis setting
A: 0.1 V
B: 0.2 V
C: 0.3 V
Pin setting
7: With MaxDuty setting function
8: With Shutdown function
2. Package
Package Name
8-Pin TSSOP
Environmental code = G
Environmental code = U
Package
FT008-A-P-SD
FT008-A-P-SD
Drawing Code
Tape
FT008-E-C-SD
FT008-E-C-SD
Reel
FT008-E-R-SD
FT008-E-R-S1
3
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
S-8337/8338 Series
Rev.5.0_00
Pin Configuration
1. 8-Pin TSSOP
Table 1
Top view
1
2
3
4
Pin No.
8
7
6
5
Figure 2
Symbol
1
CC
2
FB
3
CSP
4
5
6
VIN
EXT
VSS
7
ROSC
8
RDuty
ON/OFF
4
Description
Error amplifier circuit output phase
compensation pin
Output voltage feedback pin
Short-circuit protection delay time
setting pin
Power supply input pin
External transistor connection pin
GND pin
Oscillation frequency setting resistor
connection pin
Maximum duty setting resistor
connection pin (S-8337 Series)
Shutdown pin (S-8338 Series)
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.5.0_00
S-8337/8338 Series
Absolute Maximum Ratings
Table 2
(Unless otherwise specified: Ta = 25°C, VSS = 0 V)
Symbol
Absolute Maximum Rating
Unit
V
VIN
VSS – 0.3 to VSS + 6.5
V
VFB
VSS – 0.3 to VSS + 6.5
V
VEXT
VSS – 0.3 to VIN + 0.3
V
VCSP
VSS – 0.3 to VIN + 0.3
V
VCC
VSS – 0.3 to VIN + 0.3
ICC
mA
±10
V
VROSC
VSS – 0.3 to VIN + 0.3
IROSC
mA
±10
V
VRDuty
VSS – 0.3 to VIN + 0.3
IRDuty
mA
±10
V
VON/OFF
VSS – 0.3 to VSS + 6.5
mW
300 (When not mounted on board)
PD
700*1
mW
Topr
–40 to +85
°C
Tstg
–40 to +125
°C
Parameter
VIN pin voltage
FB pin voltage
EXT pin voltage
CSP pin voltage
CC pin voltage
CC pin current
ROSC pin voltage
ROSC pin current
RDuty pin voltage
RDuty pin current
ON/OFF pin voltage
Power dissipation
Operating ambient temperature
Storage temperature
*1. When mounted on board
[Mounted board]
(1) Board size : 114.3 mm × 76.2 mm × t1.6 mm
(2) Board name : JEDEC STANDARD51-7
Caution
The absolute maximum ratings are rated values exceeding which the product
could suffer physical damage. These values must therefore not be exceeded
under any conditions.
(2) When not mounted on board
400
Power Dissipation PD (mW)
Power Dissipation PD (mW)
(1) When mounted on board
800
700
600
500
400
300
200
100
0
0
50
100
150
Ambient Temperature Ta (°C)
300
200
100
0
0
50
100
150
Ambient Temperature Ta (°C)
Figure 3 Power Dissipation of Package
5
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
S-8337/8338 Series
Rev.5.0_00
Electrical Characteristics
1. S-8337 Series
Table 3 Electrical Characteristics
(Unless otherwise specified: VIN = 3.3 V, Ta = 25°C)
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Unit
Test
Circuit
Operating input voltage
FB voltage
VIN
VFB
⎯
⎯
1.8
0.985
⎯
1.000
6.0
1.015
V
V
2
2
Current consumption
ISS1
⎯
400
700
μA
1
⎯
100
−100
160
−60
⎯
mA
mA
1
1
⎯
±100
⎯
ppm/°C
2
−0.1
⎯
+0.1
μA
1
fosc
× 0.9
fosc
fosc
× 1.1
kHz
1
⎯
1000
⎯
ppm/°C
1
%
1
EXT pin output current
FB voltage temperature
coefficient
FB pin input current
IEXTH
IEXTL
ΔVFB
ΔTa
IFB
fosc = 700 kHz
VFB = 0.95 V
VEXT = VIN − 0.4 V
VEXT = 0.4 V
Ta = −40°C to +85°C
⎯
fosc = 1133 kHz (ROSC = 120 kΩ)
fosc = 700 kHz (ROSC = 200 kΩ)
fosc = 286 kHz (ROSC = 510 kΩ)
Oscillation frequency*1
fosc
VFB = 0.9 V
Waveform on EXT pin is measured.
Δf
Ta = −40°C to +85°C
Oscillation frequency
osc
ΔTa
f
temperature coefficient
osc = 700 kHz
fosc = 700 kHz (ROSC = 200 kΩ)
MaxDuty = 88.5% (RDuty = 100 kΩ)
*2
Max. duty
MaxDuty
MaxDuty = 77% (RDuty = 300 kΩ)
MaxDuty = 47% (RDuty = 820 kΩ)
tSS = 10 ms, 15 ms, 20 ms
Soft-start time
tSS
Selected in three steps
tPRO = 50 ms
Short-circuit protection
tPRO
(CSP = 0.1 μF)
delay time*3
VUVLO = 1.5 V to 2.3 V
UVLO detection voltage VUVLO
Selected in 0.1 V steps
VUVLOHYS = 0.1 V to 0.3 V
UVLO hysteresis width VUVLOHYS
Selected in 0.1 V steps
VFB = 2 V
ICCH
CC pin output current
VFB = 0 V
ICCL
⎯
Timer latch reset voltage
VRTLT
MaxDuty
MaxDuty
MaxDuty
−5
+5
tSS
× 0.75
tSS
tSS
× 1.5
ms
1
37.5
50
75
ms
1
V
1
mV
1
μA
μA
V
1
1
1
VUVLO
VUVLO
VUVLO
× 0.95
× 1.05
VUVLOHYS
VUVLOHYS
VUVLOHYS
× 0.6
× 1.4
−75
−50
−37.5
37.5
50
75
0.7
1.0
1.3
*1. The recommended range of the resistance (Rosc) for setting the oscillation frequency is Rosc = 120 kΩ to 510 kΩ (fOSC = 286 kHz to
1.133 MHz). However, the oscillation frequency is in the range of typical values when an ideal resistor is externally connected, so
actually the fluctuation of the IC (±10%) must be considered.
*2. The recommended range of the resistance (RDuty/Rosc) for setting the maximum duty is RDuty/Rosc = 0.5 to 4.1 (MaxDuty = 47 to 88.5%).
However, the maximum duty is in the range of typical values when an ideal resistor is externally connected, so actually the fluctuation
of the IC (±5%) must be considered.
*3. The short-circuit protection time can be set by the external capacitor, and the maximum set value by the external capacitor is unlimited
when an ideal case is assumed. But, use CSP = approximately 0.47 μF as a target maximum value due to the need to consider the
discharge time of the capacitor.
6
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.5.0_00
S-8337/8338 Series
2. S-8338 Series
Table 4 Electrical Characteristics
(Unless otherwise specified: VIN = 3.3 V, Ta = 25°C)
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Unit
Test
Circuit
Operating input voltage
FB voltage
VIN
VFB
⎯
⎯
1.8
0.985
⎯
1.000
6.0
1.015
V
V
2
2
Current consumption
ISS1
fosc = 700 kHz
VFB = 0.95 V
⎯
400
700
μA
1
Shutdown current
consumption
ISSS
VIN = 6.0 V
⎯
⎯
1.0
μA
1
IEXTH
IEXTL
ΔVFB
ΔTa
IFB
VEXT = VIN − 0.4 V
VEXT = 0.4 V
⎯
100
−100
160
−60
⎯
mA
mA
1
1
⎯
±100
⎯
ppm/°C
2
⎯
−0.1
⎯
+0.1
μA
fosc = 1133 kHz (ROSC = 120 kΩ)
fosc = 700 kHz (ROSC = 200 kΩ)
fosc
fosc
fosc = 286 kHz (ROSC = 510 kΩ)
Oscillation frequency*1
fosc
fosc
kHz
× 0.9
× 1.1
VFB = 0.9 V
Waveform on EXT pin is measured
Δfosc
Ta = −40°C to +85°C
Oscillation frequency
⎯
⎯
ppm/°C
1000
ΔTa
fosc = 700 kHz
temperature coefficient
Max. duty ratio
MaxDuty fosc = 700 kHz (ROSC = 200 kΩ)
83
88
93
%
tSS = 10 ms, 15 ms, 20 ms
tSS
tSS
tSS
ms
Soft-start time
tSS
× 0.75
× 1. 5
Selectable in three steps
tPRO = 50 ms
Short-circuit protection
tPRO
37.5
50
75
ms
(CSP = 0.1 μF)
delay time*2
VUVLO = 1.5 V to 2.3 V
VUVLO
VUVLO
UVLO detection voltage VUVLO
VUVLO
V
× 0.95
× 1.05
Selected in 0.1 V steps
VUVLOHYS = 0.1 V to 0.3 V
VUVLOHYS
VUVLOHYS
UVLO hysteresis width VUVLOHYS
VUVLOHYS
mV
× 0.6
× 1.4
Selected in 0.1 V steps
VFB = 2 V
−75
−50
−37.5
μA
ICCH
CC pin output current
VFB = 0 V
μA
ICCL
37.5
50
75
Timer latch reset
⎯
VRTLT
0.7
1.0
1.3
V
voltage
Shutdown pin input
⎯
⎯
⎯
VSH
1.8
V
voltage (High level)
Shutdown pin input
⎯
⎯
⎯
VSL
0.3
V
voltage (Low level)
Shutdown pin input
⎯
−0.1
⎯
+0.1
μA
ISH
current (High level)
Shutdown pin input
⎯
−0.1
⎯
+0.1
μA
ISL
current (Low level)
1
EXT pin output current
FB voltage temperature
coefficient
FB pin input current
Ta = −40°C to +85°C
1
1
1
1
1
1
1
1
1
1
1
1
1
1
*1. The recommended range of the resistance (Rosc) for setting the oscillation frequency is Rosc = 120 kΩ to 510 kΩ (fosc = 286 kHz to 1.133
MHz). However, the oscillation frequency is in the range of typical values when an ideal resistor is externally connected, so actually
the fluctuation of the IC (±10%) must be considered.
*2. The short-circuit protection time can be set by the external capacitor, and the maximum set value by the external capacitor is unlimited
when an ideal case is assumed. But, use CSP = approximately 0.47 μF as a target maximum value due to the need to consider the
discharge time of the capacitor.
7
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
S-8337/8338 Series
Rev.5.0_00
External Parts When Measuring Electrical Characteristics
Table 5 External Parts
Element Name
Inductor
Diode
Output capacitor
Transistor
Oscillation frequency setting resistor
Maximum duty ratio setting resistor
Short-circuit protection delay time
setting capacitor
Output voltage setting resistor 1
Output voltage setting resistor 2
FB pin capacitor
Phase compensation resistor
Phase compensation capacitor
8
Symbol
L
SD
CL
M1
ROSC
RDuty
Manufacturer
TDK Corporation
Rohm Co., Ltd.
⎯
Sanyo Electric Co., Ltd.
⎯
⎯
Part Number
LDR655312T 4.7 μH
RB491D
Ceramic 10 μF
MCH3406
200 kΩ (when fOSC = 700 kHz)
300 kΩ (when MaxDuty = 77%)
CSP
⎯
0.1 μF (when tPRO = 50 ms)
RFB1
RFB2
CFB
RZ
CZ
⎯
⎯
⎯
⎯
⎯
8.2 kΩ (when VOUT = 9.2 V)
1.0 kΩ (when VOUT = 9.2 V)
180 pF
200 kΩ
0.01 μF
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.5.0_00
S-8337/8338 Series
Measurement Circuits
1.
RZ
A
CZ
CSP
CC
RDuty
(ON/OFF)
FB
ROSC
CSP
VSS
VIN
EXT
CIN
ROSC RDuty
Oscilloscope
Figure 4
2.
RFB1
RDuty
(ON/OFF)
FB
ROSC
CFB
RZ
CZ
CC
SD
RFB2
CL
L
M1 CIN
CSP
VSS
VIN
EXT
ROSC RDuty
CSP
V
Figure 5
9
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
S-8337/8338 Series
Rev.5.0_00
Operation
1. Switching control method
PWM control (S-8337/8338 Series)
The S-8337/8338 Series is a DC-DC converter using a pulse width modulation method (PWM).
The pulse width of the S-8337/8338 Series varies from 0% to the maximum duty set by RDuty
depending on the load current (the pulse width of the S-8338 Series is fixed to 88%), but its switching
frequency does not change. Consequently, the ripple voltage generated from switching can be
removed easily via a filter.
2. Soft-start function
For this IC, the built-in soft-start circuit controls the rush current and overshoot of the output voltage
when powering on or when the ON/ OFF pin is switched to the “H” level. A reference voltage
adjustment method is adopted as the soft-start method. The following describes the soft-start
function.
The raising of the output voltage is controlled by slowly raising the reference voltage of the error
amplifier input from 0 V at power on as shown in Figure 6. The soft-start function is realized by
controlling the voltage of the FB pin so that it is the same potential as the reference voltage that is
slowly raised. A Rail-to-Rail amplifier is adopted as the error amplifier, which means that the voltage
is loop controlled so that it can be the same as the reference voltage.
The following explains the operation at power on (refer to Figure 7).
When VIN is raised from 0 V to 3.3 V, the VOUT voltage rises to a value close to VIN via the inductor L
and diode SD. This raises the voltage of the FB pin (VFB) by approximately 0.35 V (when RFB1 = 8.2
kΩ, RFB2 = 1.0 kΩ). Because the reference voltage rises from 0 V, the VFB voltage is higher than the
reference voltage while the voltage rises from 0 V to 0.35 V. During this period, the EXT output is low.
The EXT output is in the stepped-up status between high and low after the reference voltage reaches
0.35 V and VOUT is slowly raised in accordance with the rising of the reference voltage.
Once the reference voltage rises, the voltage cannot be reset (the reference voltage is 0 V) unless the
power supply voltage is the UVLO detection voltage or lower or the shutdown pin is the “L” level.
Conversely, when the power supply voltage rises up to the reset voltage after it is lowered to the
UVLO detection voltage or lower, the output voltage is stepped up by the soft-start function.
SD
VOUT
L
PWM
Comparator
VIN
M1
–
EXT
RFB1
0.5 V
0V
+
Error amplifier
FB
CL
+
CC
–
RZ
Vref
CZ
Figure 6
10
Error amplifier
reference voltage
RFB2
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.5.0_00
S-8337/8338 Series
(VIN = 0 V→3.3 V, VOUT = 9.2 V, RFB1 = 8.2 kΩ, RFB2 = 1.0 kΩ)
3.3 V
Input voltage
(VIN)
0V
tSS
9.2 V
Output voltage
(VOUT)
VOUT × 0.95 V
2.9 V
0V
1.0 V
Error amplifier
reference voltage 0.35 V
0V
1.0 V
FB pin voltage
(VFB)
0.3 V
0V
4.0 V
EXT pin voltage
(VEXT)
0V
t (ms)
Figure 7
11
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
S-8337/8338 Series
Rev.5.0_00
3. Shutdown pin (S-8338 Series only)
This pin stops or starts step-up operations.
Switching the shutdown pin to the “L” level stops operation of all the internal circuits and reduces the
current consumption significantly.
DO NOT use the shutdown pin in a floating state because it is not pulled up or pulled down internally.
DO NOT apply voltage of between 0.3 V and 1.8 V to the shutdown pin because applying such a
voltage increases the current consumption. If the shutdown pin is not used, connect it to the VIN pin.
Table 6
Shutdown Pin
CR Oscillator
Output Voltage
“H”
Operates
Fixed
“L”
Stopped
≅ VIN*1
*1. Voltage of VIN from which the voltage drop from the
DC resistance of the inductor and the forward
voltage of the diode are subtracted
VIN
ON/OFF
VSS
Figure 8
4. Timer latch short-circuit protection function
This IC has a timer latch short-circuit protection circuit that stops the switching operation when the
output voltage drops for a specific time due to output short-circuiting. A capacitor (CSP) that is used
to set the delay time of this short-circuit protection circuit is connected to the CSP pin.
This IC operates at the maximum duty ratio if the output voltage drops due to output short-circuiting.
At the maximum duty ratio, constant-current charging of CSP starts. If this status lasts for a specific
time and the CSP pin voltage rises above the reference voltage (1 V), the latch mode is set. Note that
the latch mode is different from the shutdown status in that the switching operation is stopped but the
internal circuitry operates normally.
To reset the latch operation to protect the IC from short-circuiting, either lower VIN to the timer latch
reset voltage or lower or lower the level of the shutdown pin to “L”. Note that the latch operation is not
reset even if VIN falls below the UVLO voltage.
5. UVLO function
This IC includes a UVLO (under-voltage lockout) circuit to prevent the IC from malfunctioning due to a
transient status when power is applied or a momentary drop of the supply voltage. When UVLO is in
the detection state, switching is stopped and the external FET is held in the off status. Once UVLO
enters the detection state, the soft-start function is reset.
Note that the other internal circuits operate normally and that the status is different from the power-off
status.
12
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.5.0_00
S-8337/8338 Series
6. Error amplifier
The error amplifier outputs the PWM control signal so that the voltage of the FB pin is held at a specific
value (1 V). By connecting a resistor (RZ) and capacitor (CZ) to the output pin (CC pin) of the error
amplifier in series, an optional loop gain can be set, enabling stabilized phase compensation.
7. Operation
The following are basic equations [(1) through (7)] of the step-up switching regulator (refer to
Figure 9).
L
CONT
VIN
M1
D
VOUT
EXT
FB
CL
VSS
Figure 9 Step-up Switching Regulator Circuit for Basic Equations
Voltage at the CONT pin at the moment M1 is turned ON (current IL flowing through L is zero), VA:
VA = VS*1……………………………………………………………………………………………….…(1)
*1.
VS: Non-saturated voltage of M1
Change in IL over time:
dlL VL VIN − VS
=
=
dt
L
L
…………………………………………………………………………………..…(2)
Integration of the above equation:
VIN − VS
IL =
•t
L
…………………………………………………………………….…………….……(3)
IL flows while M1 is ON (ton). This time is determined by the oscillation frequency of OSC.
Peak current (IPK) after tON:
VIN − VS
IPK =
• tON
L
……………………………………………………………………………………(4)
The energy stored in L is represented by
1
• L(IPK)2.
2
When M1 is turned OFF (tOFF), the energy stored in L is released via a diode, generating a reverse
voltage (VL).
VL:
VL = VOUT + VD *2 − VIN ……….………………………………………………………..………………(5)
(
*2.
)
VD: Diode forward voltage
The voltage on the CONT pin rises only by VOUT + VD.
13
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
S-8337/8338 Series
Rev.5.0_00
Change in current (IL) flowing through the diode into VOUT during tOFF:
dlL VL VOUT + VD − VIN
=
=
dt
L
L
…………………………………………………………..…………………(6)
Integration of the above equation is as follows:
VOUT + VD − VIN
IL = IPK −
•t
L
…………………………………………………………………………(7)
During tON, energy is stored in L and is not transmitted to VOUT. When receiving output current (IOUT)
from VOUT, the energy of the capacitor (CL) is used. As a result, the pin voltage of CL is reduced, and
goes to the lowest level after M1 is turned ON (tON). When M1 is turned OFF, the energy stored in L is
transmitted via the diode to CL, and the pin voltage of CL rises drastically. Because VOUT is a time
function indicating the maximum value (ripple voltage: Vp-p) when the current flowing through the
diode into VOUT and the load current IOUT match.
Next, this ripple voltage is determined as follows.
IOUT vs t1 (time) from when M1 is turned OFF (after tON) to when VOUT reaches the maximum level:
VOUT + VD − VIN
IOUT = IPK −
• t1
L
………………………………………………….………………...…(8)
L
∴ t1 = (IPK − IOUT ) •
VOUT + VD − VIN ……………………………………………………………...…...(9)
When M1 is turned ON (after tOFF), IL = 0 (when the energy of the inductor is completely transmitted):
Based on equation (7),
L
tOFF
=
V
OUT
+
V
D
−
V
IN
IPK …………………………………………………………………..………….(10)
When substituting equation (10) for equation (9):
IOUT
t1 = tOFF −
• tOFF
IPK
…………………………………………………………………………………(11)
Electrical charge ΔQ1 which is charged in CL during t1:
VOUT + VD − VIN t1
VOUT + VD − VIN 1 2
ΔQ1 = 0t1 ILdt = IPK • 0t1 dt −
• 0 tdt = IPK • t1 −
• t1
L
L
2 ……….…...(12)
When substituting equation (12) for equation (9):
1
IPK + IOUT
ΔQ1 = IPK − (IPK − IOUT ) • t1 =
• t1
2
2
…………………………………………………….…….(13)
A rise voltage (Vp-p) due to ΔQ1:
1 IPK + IOUT
ΔQ1
=
•
• t1 …………………………………………………………..……………(14)
CL
CL
2
When taking into consideration IOUT consumed during t1 and ESR*1 (RESR) of CL:
Vp − p =
Vp − p =
*1.
14
1 IPK + IOUT
IOUT • t1
ΔQ1
IPK + IOUT
=
•
…………….………………….(15)
• RESR −
• t1 +
CL
CL
2
2
CL
Equivalent Series Resistance
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.5.0_00
S-8337/8338 Series
When substituting equation (11) for equation (15):
Vp − p =
(IPK − IOUT )2 • tOFF + IPK + IOUT • RESR …………………………………………………..…(16)
2IPK
CL
2
Therefore to reduce the ripple voltage, it is important that the capacitor connected to the output pin
has a large capacity and a small ESR.
15
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
S-8337/8338 Series
Rev.5.0_00
External Parts Selection
1. Inductor
The inductance has a strong influence on the maximum output current (IOUT) and efficiency (η).
The peak current (IPK) increases by decreasing L and the stability of the circuit improves and IOUT
increases. If L is decreased further, the efficiency falls, and IOUT decreases if the current drive
capability of the external transistor is insufficient.
The loss of IPK by the switching transistor decreases by increasing L and the efficiency becomes
maximum at a certain L value. Further increasing L decrease the efficiency due to the loss of the DC
resistance of the inductor. IOUT also decreases.
If the oscillation frequency is higher, a smaller L value can be chosen, making the inductor smaller. In
the S-8337/8338 Series, the oscillation frequency can be varied within the range of 286 kHz to 1.133
MHz by the external resistor, so select an L value best suited to the frequency. The recommended
value is between 2.2 μH and 22 μH.
When selecting an inductor, note the allowable current of the inductor. If a current exceeding this
allowable current flows through the inductor, magnetic saturation occurs, substantially lowering the
efficiency and increasing the current, which results in damage to the IC.
Therefore, select an inductor so that IPK does not exceed the allowable current. IPK is expressed by
the following equations in the discontinuous mode and continuous mode.
IPK =
IPK =
2 IOUT(VOUT + VD − VIN)
( discontinuous mode ) .................................................................. (17)
fosc • L
VOUT + VD
(VOUT + VD − VIN) • VIN
• IOUT +
(continuou s mode)
VIN
2 • (VOUT + VD) • fosc • L
................................................................ (18)
fOSC = Oscillation frequency, VD ≅ 0.4 V.
2. Diode
Use an external diode that meets the following requirements.
• Low forward voltage
• High switching speed
• Reverse breakdown voltage: VOUT + [Spike voltage] or more
• Rated current: IPK or more
3. Capacitors (CIN, CL)
The capacitor on the input side (CIN) can lower the supply impedance and level the input current for
better efficiency. Select CIN according to the impedance of the power supply to be used.
The capacitor on the output side (CL) is used to smooth the output voltage. Select an appropriate
capacitance value based on the I/O conditions and load conditions. A capacitance of 10 μF or more is
recommended.
By adjusting the phase compensation of the feedback loop using the external resistor (RZ) and
capacitor (CZ), a ceramic capacitor can be used as the capacitor on the output side. If a capacitor
whose equivalent series resistance is between 30 mΩ and 500 mΩ is used as the output capacitor, the
adjustable range of the phase compensation is wider; however, note that other characteristics may be
affected by ripple voltage or other conditions at this time. The optimal capacitor differs depending on
the L value, capacitance value, wiring, and application (output load), so select the capacitor after
performing sufficient evaluation under the actual usage conditions.
16
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.5.0_00
S-8337/8338 Series
4. External transistor
A bipolar (NPN) or enhancement (N-channel) MOS FET transistor can be used as the external
transistor.
4. 1 Bipolar (NPN) type
The driving capability when the output current is increased by using a bipolar transistor is
determined by hFE and Rb of the bipolar transistor. Figure 10 shows a peripheral circuit.
VIN
Pch
Cb
2200 pF
IPK
Rb
EXT
1 kΩ
Nch
Figure 10 External Transistor Periphery
1 kΩ is recommended for Rb. Actually, calculate the necessary base current (Ib) from hFE of the
bipolar transistor as follows and select an Rb value lower than this.
Ib =
Rb =
IPK
hFE
VIN – 0.7
Ib
–
0.4
IEXTH
A small Rb increases the output current, but the efficiency decreases. Actually, a pulsating
current flows and a voltage drop occurs due to the wiring capacitance. Determine the optimum
value by experiment.
A speed-up capacitor (Cb) connected in parallel with Rb resistance as shown in Figure 10
decreases the switching loss and improves the efficiency.
Select Cb by observing the following equation.
Cb ≤
1
2π • Rb • fOSC • 0.7
However, in practice, the optimum Cb value also varies depending on the characteristics of the
bipolar transistor employed. Therefore, determine the optimum value of Cb by experiment.
17
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
S-8337/8338 Series
Rev.5.0_00
4. 2 Enhancement MOS FET type
Use an Nch power MOS FET. For high efficiency, using a MOS FET with a low ON resistance
(RON) and small input capacitance (CISS) is ideal, however, ON resistance and input capacitance
generally share a trade-off relationship. The ON resistance is efficient in a range in which the
output current is relatively great during low-frequency switching, and the input capacitance is
efficient in a range in which the output current is middling during high-frequency switching. Select
a MOS FET whose ON resistance and input capacitance are optimal depending on the usage
conditions.
The input voltage (VIN) is supplied for the gate voltage of the MOS FET, so select a MOS FET with
a gate withstanding voltage that is equal to the maximum usage value of the input voltage or
higher and a drain withstanding voltage that is equal to the amount of the output voltage (VOUT)
and diode voltage (VD) or higher.
If a MOS FET with a threshold that is near the UVLO detection voltage is used, a large current
may flow, stopping the output voltage from rising and possibly generating heat in the worst case.
Select a MOS FET with a threshold that is sufficiently lower than the UVLO detection voltage
value.
18
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.5.0_00
S-8337/8338 Series
5. Oscillation frequency and maximum duty ratio setting resistors (ROSC, RDuty)
With the S-8337/8338 Series, the oscillation frequency can be set in a range of 286 kHz to 1.133 MHz
using external resistance. Connect a resistor across the ROSC and VSS pins. Select the resistor by
using the following equation and referring to Figure 11. However, the following equation and figure
assume that the resistance value is the desired value and show the theoretical values when the IC is
in the typical conditions. Note that fluctuations of resistance and IC are not considered.
140 • 103
fOSC [kHz]
1400
1200
fOSC [kHz]
ROSC [kΩ] ≅
1000
800
600
400
200
0
0
600
400
200
ROSC [kΩ]
Figure 11 ROSC vs. fOSC
With the S-8337 Series, the maximum duty ratio can be set in a range of 47% to 88.5% by an external
resistor. Connect the resistor across the RDuty and VSS pins. Select the resistance by using the
following equation and referring to Figure 12. The maximum duty ratio fluctuates according to the
oscillation frequency. If the value of ROSC is changed, therefore, be sure to change the value of
RDuty so that it is always in proportion to ROSC. However, the following equation and figure assume
that the resistance value is the desired value and show the theoretical values when the IC is in the
typical conditions. Note that fluctuations of resistance and IC are not considered.
≅
(94.5 − MaxDuty)
11.5
100
90
MaxDuty [%]
RDuty
ROSC
80
70
60
50
40
0
1
2
3
4
5
RDuty/ROSC
Figure 12 RDuty/ROSC vs. MaxDuty
Connect resistors ROSC and RDuty as close to the IC as possible.
19
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
S-8337/8338 Series
Rev.5.0_00
6. Short-circuit protection delay time setting capacitor (CSP)
With the S-8337/8338 Series, the short-circuit protection delay time can be set to any value by an
external capacitor. Connect the capacitor across the CSP and VSS pins. Select the capacitance by
using the following equation and referring to Figure 13. However, the following equation and figure
assume that the capacitor value is the desired value and show the theoretical values when the IC is in
the typical conditions. Note that fluctuations of capacitor and IC are not considered.
tPRO [ms] • 2 • 10−
1.0
3
120
100
tPRO [ms]
CSP [μF] ≅
80
60
40
20
0
0
0.05
0.10
0.15
0.20
0.25
CSP [μF]
Figure 13 CSP vs. tPRO
7. Output voltage setting resistors (RFB1, RBF2)
With the S-8337/8338 Series, the output voltage can be set to any value by external divider resistors.
Connect the divider resistors across the VOUT and VSS pins. Because VFB = 1 V, the output voltage
can be calculated by this equation.
VOUT =
(RFB1 + RFB2)
RFB2
Connect divider resistors RFB1 and RFB2 as close to the IC to minimize effects from of noise. If noise
does have an effect, adjust the values of RFB1 and RFB2 so that RFB1 + RFB2 < 100 kΩ.
CFB connected in parallel with RFB1 is a capacitor for phase compensation. Select the optimum
value of this capacitor at which the stable operation can be ensured from the values of the inductor
and output capacitor.
8. Phase compensation setting resistor and capacitor (RZ, CZ)
The S-8337/8338 Series needs appropriate compensation for the voltage feedback loop to prevent
excessive output ripple and unstable operation from deteriorating the efficiency. This compensation is
implemented by connecting RZ and CZ in series across the CC and VSS pins. RZ sets the
high-frequency gain for a high-speed transient response. CZ sets the pole and zero of the error
amplifier and keeps the loop stable. Adjust RZ and CZ, taking into consideration conditions such as
the inductor, output capacitor, and load current, so that the optimum transient characteristics can be
obtained.
20
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.5.0_00
S-8337/8338 Series
Standard Circuits
SD
L
VOUT
RDuty (S-8337)
VIN
UVLO
M1
CIN
ROSC
PWM −
comparator
EXT
+
Timer latch
short-circuit
protection circuit
0.1 μF
VSS
CSP
CFB RFB1
Oscillator
Maximum duty circuit
+
Error amplifier
−
CL
ROSC RDuty
FB
Reference voltage
(1.0 V)
soft-start circuit
RFB2
CC
RZ
CZ
Ground point
Figure 14 Standard Circuit (S-8337 Series)
SD
L
VOUT
ON/OFF (S-8338)
VIN
UVLO
M1
CIN
ROSC
+
CFB RFB1
Oscillator
Maximum duty circuit
CL
−
EXT
PWM
comparator
+
Timer latch
short-circuit
protection circuit
0.1 μF
VSS
CSP
Error amplifier
−
Reference voltage
(1.0 V)
soft-start circuit
ROSC
FB
RFB2
CC
RZ
CZ
Ground point
Figure 15 Standard Circuit (S-8338 Series)
Caution
The above connection diagrams and constants will not guarantee successful operation.
Perform thorough evaluation using the actual application to set the constants.
21
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
S-8337/8338 Series
Rev.5.0_00
Precaution
• Mount external capacitors, diodes, and inductor as close as possible to the IC.
• Characteristics ripple voltage and spike noise occur in IC containing switching regulators. Moreover
rush current flows at the time of a power supply injection. Because these largely depend on the inductor,
the capacitor and impedance of power supply used, fully check them using an actually mounted model.
• Make sure the dissipation of the switching transistor (especially at a high temperature) does not exceed
the allowable power dissipation of the package.
• The performance of a switching regulator varies depending on the design of the PCB patterns,
peripheral circuits, and external parts. Thoroughly test all settings with your device.
• This IC builds in soft start function, starts reference voltage gradually, and it is controlled so that FB pin
voltage and reference voltage become this potential. Therefore, keep in mind that it will be in a
maximum duty state according to the factor of IC exterior if FB pin voltage is held less than reference
voltage.
• Although the IC contains a static electricity protection circuit, static electricity or voltage that exceeds
the limit of the protection circuit should not be applied.
• ABLIC Inc. assumes no responsibility for the way in which this IC is used on products created using this
IC or for the specifications of that product, nor does ABLIC Inc. assume any responsibility for any
infringement of patents or copyrights by products that include this IC either in Japan or in other
countries.
22
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.5.0_00
S-8337/8338 Series
Characteristics (Typical Data)
1. Example of Major Temperature Characteristics (Ta = −40 to 85°C)
700
600
500
ISS1
ISS1 vs. Ta (VIN = 3.3 V)
fOSC = 1133 kHz (ROSC = 120 kΩ)
fOSC = 700 kHz (ROSC = 200 kΩ)
400
[μA] 300
200
fOSC = 286 kHz (ROSC = 510 kΩ)
100
0
−40
−20
0
20
40
Ta [°C]
60
80
100
IEXTH vs. Ta (VIN = 3.3 V)
–200
f OSC = 700 kHz, MaxDuty = 77% (ROSC = 200 kΩ, RDuty = 300 kΩ)
–180
–160
–140
IEXTH –120
–100
[mA]
–80
–60
–40
–20
0
−40 −20 0
20
40
60
80 100
Ta [°C]
0.10
0.08
0.06
0.04
IFB 0.02
0
[μA]
–0.02
–0.04
–0.06
–0.08
–0.10
−40
IFB vs. Ta (VIN = 3.3 V)
1.0
0.9
0.8
0.7
ISSS 0.6
0.5
[μA]
0.4
0.3
0.2
0.1
0
−40
ISSS vs. Ta (VIN = 3.3 V)
fOSC = 700 kHz (ROSC = 200 kΩ)
−20
0
20
40
Ta [°C]
60
80
100
IEXTL vs. Ta (VIN = 3.3 V)
200
f OSC = 700 kHz, MaxDuty = 77% (ROSC = 200 kΩ, RDuty = 300 kΩ)
180
160
140
IEXTL 120
100
[mA]
80
60
40
20
0
−40 −20 0
20
40
60
80 100
Ta [°C]
fOSC vs. Ta (VIN = 3.3 V)
1400
fOSC = 1133 kHz (ROSC = 120 kΩ)
1200
1000
fOSC = 700 kHz (ROSC = 200 kΩ)
fOSC 800
[kHz] 600
fOSC = 286 kHz (ROSC = 510 kΩ)
400
200
−20
0
20
40
Ta [°C]
60
80
100
0
−40
−20
0
20
40
Ta [°C]
60
80
100
23
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
S-8337/8338 Series
Rev.5.0_00
100
90
80
70
MaxDuty 60
50
[%]
40
30
20
10
0
−40
MaxDuty vs. Ta (VIN = 3.3 V)
tSS vs. Ta (VIN = 3.3 V)
25.0
tSS = 20 ms
20.0
MaxDuty = 88.5% (ROSC = 200 kΩ, RDuty = 100 kΩ)
MaxDuty = 77% (ROSC = 200 kΩ, RDuty = 300 kΩ)
tSS 15.0
[ms]
MaxDuty = 47% (ROSC = 200 kΩ, RDuty = 820 kΩ)
tSS = 10 ms
10.0
5.0
−20
0
20
40
Ta [°C]
60
80
0
−40
100
tPRO vs. Ta (VIN = 3.3 V)
70.0
0
2.0
VUVLO 1.5
[ms] 30.0
[V]
60
80
100
80
100
80
100
80
100
VUVLO = 2.3 V
50.0
tPRO 40.0
20
40
Ta [°C]
VUVLO vs. Ta
2.5
tPRO = 50 ms (CSP = 0.1 μF)
60.0
−20
VUVLO = 1.5 V
1.0
20.0
0.5
10.0
0
−40
−20
0
20
40
Ta [°C]
60
80
100
0
−40
100
–100
–90
–80
–70
ICCH –60
–50
[μA]
–40
–30
–20
–10
0
−40
VUVLOHYS vs. Ta
0.35
0.30
VUVLOHYS = 0.3 V
0.25
VUVLOHYS 0.20
[V]
0.15
0.10
VUVLOHYS = 0.1 V
0.05
0
−40
ICCL
[μA]
24
100
90
80
70
60
50
40
30
20
10
0
−40
−20
0
20
40
Ta [°C]
60
80
ICCL vs. Ta (VIN = 3.3 V)
−20
0
20
40
Ta [°C]
60
ICCH vs. Ta (VIN = 3.3 V)
−20
0
20
40
Ta [°C]
60
VRTLT vs. Ta (VIN = 3.3 V)
1.2
1.0
0.8
VRTLT
[V]
0.6
0.4
0.2
−20
0
20
40
Ta [°C]
60
80
100
0
−40
−20
0
20
40
Ta [°C]
60
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.5.0_00
S-8337/8338 Series
VSH
[V]
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
−40
VSH vs. Ta (VIN = 3.3 V)
VSL
[V]
−20
ISH
20
40
Ta [°C]
60
80
100
ISH vs. Ta (VIN = 3.3 V)
0.1
[μA]
0
ISL
[μA]
−20
0
20
40
Ta [°C]
60
VSL vs. Ta (VIN = 3.3 V)
−20
80
100
0
20
40
Ta [°C]
60
80
100
80
100
ISL vs. Ta (VIN = 3.3 V)
0.1
0
–0.1
−40
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
−40
0
–0.1
−40
−20
0
20
40
Ta [°C]
60
25
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
S-8337/8338 Series
Rev.5.0_00
2. Example of Major Power Supply Dependence Characteristics (Ta = 25°C)
ISS1 vs. VIN
1200
fOSC = 1133 kHz
1000 (ROSC = 120 kΩ)
fOSC = 700 kHz
800 (ROSC = 200 kΩ)
ISS1
[μA]
600
400
200 fOSC = 286 kHz
(ROSC = 510 kΩ)
0
0
1
2
5
6
7
1
2
3
4
VIN [V]
5
6
0
1
2
3
4
VIN [V]
5
6
7
IEXTL vs. VIN
f OSC = 700 kHz, MaxDuty = 77% (ROSC = 200 kΩ, RDuty = 300 kΩ)
0
7
IFB vs. VIN
0.10
0.08
0.06
0.04
IFB 0.02
0
[μA]
–0.02
–0.04
–0.06
–0.08
–0.10
fOSC = 700 kHz (ROSC = 200 kΩ)
200
180
160
140
IEXTL 120
100
[mA]
80
60
40
20
0
f OSC = 700 kHz, MaxDuty = 77% (ROSC = 200 kΩ, RDuty = 300 kΩ)
0
1
2
3
4
VIN [V]
5
6
7
5
6
7
fOSC vs. VIN
1400
fOSC = 1133 kHz (ROSC = 120 kΩ)
1200
1000
fOSC = 700 kHz (ROSC = 200 kΩ)
fOSC 800
[kHz] 600
fOSC = 286 kHz (ROSC = 510 kΩ)
400
200
0
0
1
2
3
4
VIN [V]
5
6
0
7
MaxDuty vs. VIN
100
90
80
70
MaxDuty 60
50
[%]
40
30
20
10
0
1
2
3
4
VIN [V]
tSS vs. VIN
25.0
tSS = 20 ms
20.0
MaxDuty = 88.5%
(ROSC = 200 kΩ, RDuty = 100 kΩ)
MaxDuty = 77%
(ROSC = 200 kΩ, RDuty = 300 kΩ)
tSS 15.0
[ms]
MaxDuty = 47%
(ROSC = 200 kΩ, RDuty = 820 kΩ)
tSS = 10 ms
10.0
5.0
0
0
26
3
4
VIN [V]
IEXTH vs. VIN
–200
–180
–160
–140
IEXTH –120
–100
[mA]
–80
–60
–40
–20
0
ISSS vs. VIN
1.0
0.9
0.8
0.7
ISSS 0.6
0.5
[μA]
0.4
0.3
0.2
0.1
0
1
2
3
4
VIN [V]
5
6
7
0
1
2
3
4
VIN [V]
5
6
7
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.5.0_00
S-8337/8338 Series
tPRO vs. VIN
70.0
tPRO = 50 ms (CSP = 0.1 μF)
60.0
50.0
tPRO 40.0
[ms] 30.0
20.0
10.0
0
0
ICCL
[μA]
[V]
2
3
4
VIN [V]
5
6
0
7
ICCL vs. VIN
100
90
80
70
60
50
40
30
20
10
0
VSH
[V]
0
VSL
1
1
2
3
4
VIN [V]
5
6
ICCH vs. VIN
–100
–90
–80
–70
ICCH –60
–50
[μA]
–40
–30
–20
–10
0
1
2
0
1
2
VSL vs. VIN
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
5
6
7
5
6
7
5
6
7
VSH vs. VIN
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
7
3
4
VIN [V]
3
4
VIN [V]
ISH vs. VIN
0.1
ISH
[μA]
0
–0.1
0
1
2
3
4
VIN [V]
5
6
7
5
6
7
0
1
2
3
4
VIN [V]
ISL vs. VIN
0.1
ISL
[μA]
0
–0.1
0
1
2
3
4
VIN [V]
27
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
S-8337/8338 Series
Rev.5.0_00
3. Example of External Parts Dependence Characteristics
fOSC vs. ROSC (VIN = 3.3 V)
1600
Ta = –40°C
Ta = 25°C
Ta = 85°C
1400
1200
fOSC
1000
[kHz]
1200
600
400
200
200
0
0
100
200
300
400
ROSC [kΩ]
500
Ta = –40°C
Ta = 25°C
Ta = 85°C
0 0.5 1 1.5 2 2.5 3 3.5 4
RDuty/ROSC
0
600
MaxDuty vs. RDuty/ROSC (ROSC = 200 kΩ, VIN = 3.3 V)
100
90
80
70
MaxDuty 60
50
[%]
40
30
20
10
0
300
400
ROSC [kΩ]
500
300
300
250
250
tPRO
600
Ta = –40°C
Ta = 25°C
Ta = 85°C
4.5 5
tPRO vs. CSP (VIN = 5.0 V)
350
[ms] 150
200
0 0.5 1 1.5 2 2.5 3 3.5 4
RDuty/ROSC
4.5 5
200
100
MaxDuty vs. RDuty/ROSC (ROSC = 200 kΩ, VIN = 5.0 V)
100
90
80
70
MaxDuty 60
50
[%]
40
30
20
10
0
tPRO vs. CSP (VIN = 3.3 V)
350
200
[ms] 150
100
Ta = –40°C
Ta = 25°C
Ta = 85°C
50
0
0
28
800
400
0
tPRO
1000
[kHz]
600
Ta = –40°C
Ta = 25°C
Ta = 85°C
1400
fOSC
800
fOSC vs. ROSC (VIN = 5.0 V)
1600
0.1
0.2
0.3
CSP [μF]
0.4
0.5
100
Ta = –40°C
Ta = 25°C
Ta = 85°C
50
0
0
0.1
0.2
0.3
CSP [μF]
0.4
0.5
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.5.0_00
S-8337/8338 Series
4. Examples of Transient Response Characteristics
4. 1 Powering ON (VOUT = 9.2 V, VIN = 0 V→3.3 V, Ta = 25°C)
(1) fOSC = 1133 kHz, IOUT = 0 mA, tSS = 10 ms
VIN
[V]
4
(2) fOSC = 1133 kHz, IOUT = 100 mA, tSS = 10 ms
12
12
8 VOUT
8 VOUT
4 [V]
4 [V]
0
2
VIN
[V]
0
0
5
10
time [ms]
15
4
–5
5
10
time [ms]
15
20
(4) fOSC = 700 kHz, IOUT = 100 mA, tSS = 10 ms
12
8 VOUT
8 VOUT
4 [V]
4 [V]
0
2
VIN
[V]
4
0
2
0
–5
0
5
10
time [ms]
15
20
(5) fOSC = 286 kHz, IOUT = 0 mA, tSS = 10 ms
[V]
0
12
0
VIN
2
20
(3) fOSC = 700 kHz, IOUT = 0 mA, tSS = 10 ms
[V]
0
0
–5
VIN
4
4
–5
0
5
10
time [ms]
15
20
(6) fOSC = 286 kHz, IOUT = 100 mA, tSS = 10 ms
12
12
8 VOUT
8 VOUT
4 [V]
4 [V]
0
2
VIN
[V]
0
4
0
2
0
–5
0
5
10
time [ms]
15
20
–5
0
5
10
time [ms]
15
20
29
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
S-8337/8338 Series
Rev.5.0_00
4. 2 Responses of shutdown pin (VOUT = 9.2 V, VON/OFF = 0 V→3.3 V)
(1) fOSC = 1133 kHz, IOUT = 0 mA, tSS = 10 ms
VON/OFF
[V]
4
(2) fOSC = 1133 kHz, IOUT = 100 mA, tSS = 10 ms
12
12
8 VOUT
8 VOUT
4 [V]
4 [V]
0
2
VON/OFF
[V]
0
0
5
10
time [ms]
15
4
–5
15
20
12
8 VOUT
8 VOUT
4 [V]
4 [V]
2
VON/OFF
[V]
4
0
2
0
0
5
10
time [ms]
15
20
(5) fOSC = 286 kHz, IOUT = 0 mA, tSS = 10 ms
4
–5
0
5
10
time [ms]
15
20
(6) fOSC = 286 kHz, IOUT = 100 mA, tSS = 10 ms
12
12
8 VOUT
8 VOUT
4 [V]
4 [V]
0
2
VON/OFF
[V]
0
4
0
2
0
–5
30
5
10
time [ms]
(4) fOSC = 700 kHz, IOUT = 100 mA, tSS = 10 ms
0
–5
[V]
0
12
0
VON/OFF
2
20
(3) fOSC = 700 kHz, IOUT = 0 mA, tSS = 10 ms
[V]
0
0
–5
VON/OFF
4
0
5
10
time [ms]
15
20
–5
0
5
10
time [ms]
15
20
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.5.0_00
S-8337/8338 Series
4. 3 Load fluctuations (VOUT = 9.2 V, VIN = 3.3 V, Ta = 25°C, RZ = 200 kΩ, CZ = 0.01 μF)
(1) fOSC = 1133 kHz, IOUT = 0.1 mA→100 mA
(2) fOSC = 1133 kHz, IOUT = 100 mA→0.1 mA
10.0
IOUT
IOUT
10.0
100 mA
9.8
100 mA
9.8
0.1 mA
9.6
0.1 mA
9.6
9.4
VOUT
9.2
[0.2 V/div]
9.4
VOUT
9.2
[0.2 V/div]
9.0
–20
–10
0
time [ms]
10
8.8
20
(3) fOSC = 700 kHz, IOUT = 0.1 mA→100 mA
–20
–10
0
time [ms]
10
(4) fOSC = 700 kHz, IOUT = 100 mA→0.1 mA
10.0
IOUT
9.0
IOUT
8.8
20
10.0
100 mA
9.8
100 mA
9.8
0.1 mA
9.6
0.1 mA
9.6
9.4
VOUT
9.2
[0.2 V/div]
–20
9.0
–10
0
time [ms]
10
9.2
[0.2 V/div]
9.0
8.8
20
(5) fOSC = 286 kHz, IOUT = 0.1 mA→100 mA
–20
–10
0
time [ms]
10
(6) fOSC = 286 kHz, IOUT = 100 mA→0.1 mA
10.0
IOUT
9.4
VOUT
IOUT
8.8
20
10.0
100 mA
9.8
100 mA
9.8
0.1 mA
9.6
0.1 mA
9.6
9.4
VOUT
9.2
[0.2 V/div]
–20
9.0
–10
0
time [ms]
10
8.8
20
9.4
VOUT
9.2
[0.2 V/div]
9.0
–20
–10
0
time [ms]
10
8.8
20
31
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
S-8337/8338 Series
Rev.5.0_00
4. 4 Input voltage fluctuations (VOUT = 9.2 V, IOUT = 100 mA, RZ = 200 kΩ, CZ = 0.01 μF)
(1) fOSC = 1133 kHz, VIN = 2.7 V→3.7 V
(2) fOSC = 1133 kHz, VIN = 3.7 V→2.7 V
4.0
4.0
VIN 3.5
VIN 3.5
[V] 3.0
[V] 3.0
2.5
–20
9.30
–10
0
time [ms]
10
2.5
9.25 VOUT
9.25 VOUT
9.20 [V]
9.20 [V]
9.15
9.15
20
(3) fOSC = 700 kHz, VIN = 2.7 V→3.7 V
–20
4.0
VIN 3.5
VIN 3.5
[V] 3.0
[V] 3.0
–20
9.30
–10
0
time [ms]
10
9.25 VOUT
9.15
9.15
20
–20
VIN 3.5
[V] 3.0
32
–10
0
time [ms]
10
20
(6) fOSC = 286 kHz, VIN = 3.7 V→2.7 V
[V] 3.0
9.30
10
9.30
9.20 [V]
VIN 3.5
0
time [ms]
20
9.25 VOUT
4.0
–10
10
2.5
4.0
–20
0
time [ms]
9.20 [V]
(5) fOSC = 286 kHz, VIN = 2.7 V→3.7 V
2.5
–10
(4) fOSC = 700 kHz, VIN = 3.7 V→2.7 V
4.0
2.5
9.30
2.5
9.30
9.25 VOUT
9.25 VOUT
9.20 [V]
9.20 [V]
9.15
9.15
20
–20
–10
0
time [ms]
10
20
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.5.0_00
S-8337/8338 Series
Reference Data
1. Reference data for external parts
Table 7 Properties of External Parts
Element Name
Inductor
Diode
Output capacitor
Transistor
*1. DCR :
*2. IMAX :
*3. VF :
*4. IF :
*5. VDSS :
*6. VGSS :
*7. Ciss :
*8. RDS(ON)
*9. VGS :
*10. ID :
Product Name
Manufacture
LDR655312T
TDK Corporation
RB491D
⎯
Rohm Co., Ltd.
⎯
MCH3406
Sanyo Electric Co., Ltd.
Characteristics
4.7 μH, DCR*1 = 206 mΩ, IMAX*2 = 0.9 A,
Height = 1.2 mm
VF*3 = 0.45 V, IF*4 = 1.0 A
16 V, 10 μF
VDSS*5 = 20 V, VGSS*6 = ±10 V, Ciss*7 = 280 pF,
RDS(ON)*8 = 82 mΩ max. (VGS*9 = 2.5 V, ID*10 = 1 A)
DC resistance
Maximum allowable current
Forward voltage
Forward current
Drain to source voltage (When between gate and source short circuits)
Gate to source voltage (When between drain and source short circuits)
Input capacitance
: Drain to source on resistance
Gate to source voltage
Drain current
Caution The values shown in the characteristics column of Table 7 above are based on the
materials provided by each manufacturer. However, consider the characteristics of the
original materials when using the above products.
33
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
S-8337/8338 Series
Rev.5.0_00
2. Reference data (1)
The data of (a) output current (IOUT) vs. efficiency (η) characteristics and (b) output current (IOUT) vs.
output voltage (VOUT) characteristics is shown below.
2. 1 VOUT = 13.1 V (RFB1 = 7.5 kΩ, RFB2 = 620 Ω)
(1) fOSC = 1133 kHz, MaxDuty = 77 % (ROSC = 120 kΩ, RDuty = 180 kΩ)
(a) IOUT vs. η
(b) IOUT vs. VOUT
100
90
80
70
60
η
50
[%]
40
30
20
10
0
0.01
13.20
13.15
13.10
VOUT
13.05
[V]
13.00
VIN = 5.0 V
0.1
1
10
IOUT [mA]
100
1000
12.95
12.90
0.01
VIN = 5.0 V
0.1
1
10
IOUT [mA]
100
1000
100
1000
100
1000
(2) fOSC = 700 kHz, MaxDuty = 77 % (ROSC = 200 kΩ, RDuty = 300 kΩ)
(a) IOUT vs. η
(b) IOUT vs. VOUT
100
90
80
70
60
η
[%] 50
40
30
20
10
0
0.01
13.20
13.15
13.10
VOUT
13.05
[V]
13.00
VIN = 5.0 V
0.1
1
10
IOUT [mA]
100
1000
12.95
12.90
0.01
VIN = 5.0 V
0.1
1
10
IOUT [mA]
(3) fOSC = 286 kHz, MaxDuty = 77 % (ROSC = 510 kΩ, RDuty = 750 kΩ)
(a) IOUT vs. η
(b) IOUT vs. VOUT
100
90
80
70
60
η
50
[%]
40
30
20
10
0
0.01
13.20
34
13.15
13.10
VOUT
13.05
[V]
13.00
VIN = 5.0 V
0.1
1
10
IOUT [mA]
100
1000
12.95
12.90
0.01
VIN = 5.0 V
0.1
1
10
IOUT [mA]
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.5.0_00
S-8337/8338 Series
2. 2 VOUT = 9.2 V (RFB1 = 8.2 kΩ, RFB2 = 1.0 kΩ)
(1) fOSC = 1133 kHz, MaxDuty = 77 % (ROSC = 120 kΩ, RDuty = 180 kΩ)
(a) IOUT vs. η
(b) IOUT vs. VOUT
100
90
80
70
60
η
50
[%]
40
30
20
10
0
0.01
9.30
9.25
VOUT
[V]
9.20
9.15
9.10
VIN = 3.3 V
VIN = 5.0 V
0.1
1
10
IOUT [mA]
100
9.05
9.00
0.01
1000
VIN = 3.3 V
VIN = 5.0 V
0.1
1
10
IOUT [mA]
100
1000
100
1000
100
1000
(2) fOSC = 700 kHz, MaxDuty = 77 % (ROSC = 200 kΩ, RDuty = 300 kΩ)
(a) IOUT vs. η
(b) IOUT vs. VOUT
100
90
80
70
60
η
50
[%]
40
30
20
10
0
0.01
9.30
9.25
VOUT
[V]
9.20
9.15
9.10
VIN = 3.3 V
VIN = 5.0 V
0.1
1
10
IOUT [mA]
100
9.05
9.00
0.01
1000
VIN = 3.3 V
VIN = 5.0 V
0.1
1
10
IOUT [mA]
(3) fOSC = 286 kHz, MaxDuty = 77 % (ROSC = 510 kΩ, RDuty = 750 kΩ)
(a) IOUT vs. η
(b) IOUT vs. VOUT
100
90
80
70
60
η
50
[%]
40
30
20
10
0
0.01
9.30
9.25
VOUT
[V]
9.20
9.15
9.10
VIN = 3.3 V
VIN = 5.0 V
0.1
1
10
IOUT [mA]
100
1000
9.05
9.00
0.01
VIN = 3.3 V
VIN = 5.0 V
0.1
1
10
IOUT [mA]
35
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
S-8337/8338 Series
Rev.5.0_00
2. 3 VOUT = 6.1 V (RFB1 = 5.1 kΩ, RFB2 = 1.0 kΩ)
(1) fOSC = 1133 kHz, MaxDuty = 77 % (ROSC = 120 kΩ, RDuty = 180 kΩ)
(a) IOUT vs. η
(b) IOUT vs. VOUT
100
90
80
70
60
η
50
[%]
40
30
20
10
0
0.01
6.20
6.15
VOUT
[V]
6.10
6.05
6.00
VIN = 1.8 V
VIN = 3.3 V
0.1
1
10
IOUT [mA]
100
5.95
5.90
0.01
1000
VIN = 1.8 V
VIN = 3.3 V
0.1
1
10
IOUT [mA]
100
1000
100
1000
100
1000
(2) fOSC = 700 kHz, MaxDuty = 77 % (ROSC = 200 kΩ, RDuty = 300 kΩ)
(a) IOUT vs. η
(b) IOUT vs. VOUT
100
90
80
70
60
η
50
[%]
40
30
20
10
0
0.01
6.20
6.15
VOUT
[V]
6.10
6.05
6.00
VIN = 1.8 V
VIN = 3.3 V
0.1
1
10
IOUT [mA]
100
5.95
5.90
0.01
1000
VIN = 1.8 V
VIN = 3.3 V
0.1
1
10
IOUT [mA]
(3) fOSC = 286 kHz, MaxDuty = 77 % (ROSC = 510 kΩ, RDuty = 750 kΩ)
(a) IOUT vs. η
(b) IOUT vs. VOUT
100
90
80
70
60
η
[%] 50
40
30
20
10
0
0.01
6.20
36
6.15
VOUT
[V]
6.10
6.05
6.00
VIN = 1.8 V
VIN = 3.3 V
0.1
1
10
IOUT [mA]
100
1000
5.95
5.90
0.01
VIN = 1.8 V
VIN = 3.3 V
0.1
1
10
IOUT [mA]
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.5.0_00
S-8337/8338 Series
3. Reference data (2)
The data of output current (IOUT) vs. ripple voltage (Vr) characteristics is shown below.
3. 1 VOUT = 13.1 V (RFB1 = 7.5 kΩ, RFB2 = 620 Ω)
(1) fOSC = 1133 kHz, MaxDuty = 77 % (ROSC = 120 kΩ, RDuty = 180 kΩ)
100
90
80
70
60
Vr
50
[mV]
40
30
20
10
0
0.01
VIN = 5.0 V
0.1
1
10
IOUT [mA]
100
1000
(2) fOSC = 700 kHz, MaxDuty = 77 % (ROSC = 200 kΩ, RDuty = 300 kΩ)
100
90
80
70
60
Vr
50
[mV]
40
30
20
10
0
0.01
VIN = 5.0 V
0.1
1
10
IOUT [mA]
100
1000
(3) fOSC = 286 kHz, MaxDuty = 77 % (ROSC = 510 kΩ, RDuty = 750 kΩ)
100
90
80
70
60
Vr
50
[mV]
40
30
20
10
0
0.01
VIN = 5.0 V
0.1
1
10
IOUT [mA]
100
1000
3. 2 VOUT = 9.2 V (RFB1 = 8.2 kΩ, RFB2 = 1.0 kΩ)
(1) fOSC = 1133 kHz, MaxDuty = 77 % (ROSC = 120 kΩ, RDuty = 180 kΩ)
100
90
80
70
60
Vr
50
[mV]
40
30
20
10
0
0.01
VIN = 3.3 V
VIN = 5.0 V
0.1
1
10
IOUT [mA]
100
1000
(2) fOSC = 700 kHz, MaxDuty = 77 % (ROSC = 200 kΩ, RDuty = 300 kΩ)
100
90
80
70
60
Vr
50
[mV]
40
30
20
10
0
0.01
VIN = 3.3 V
VIN = 5.0 V
0.1
1
10
IOUT [mA]
100
1000
(3) fOSC = 286 kHz, MaxDuty = 77 % (ROSC = 510 kΩ, RDuty = 750 kΩ)
100
90
80
70
60
Vr
50
[mV]
40
30
20
10
0
0.01
VIN = 3.3 V
VIN = 5.0 V
0.1
1
10
IOUT [mA]
100
1000
37
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
S-8337/8338 Series
Rev.5.0_00
3. 3 VOUT = 6.1 V (RFB1 = 5.1 kΩ, RFB2 = 1.0 kΩ)
(1) fOSC = 1133 kHz, MaxDuty = 77 % (ROSC = 120 kΩ, RDuty = 180 kΩ)
100
90
80
70
Vr 60
50
[mV]
40
30
20
10
0
0.01
VIN = 1.8 V
VIN = 3.3 V
0.1
1
10
IOUT [mA]
100
1000
(3) fOSC = 286 kHz, MaxDuty = 77 % (ROSC = 510 kΩ, RDuty = 750 kΩ)
100
90
80
70
Vr 60
50
[mV]
40
30
20
10
0
0.01
38
VIN = 1.8 V
VIN = 3.3 V
0.1
1
10
IOUT [mA]
100
1000
(2) fOSC = 700 kHz, MaxDuty = 77 % (ROSC = 200 kΩ, RDuty = 300 kΩ)
100
90
80
70
Vr 60
50
[mV]
40
30
20
10
0
0.01
VIN = 1.8 V
VIN = 3.3 V
0.1
1
10
IOUT [mA]
100
1000
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.5.0_00
S-8337/8338 Series
Marking Specification
1. 8-Pin TSSOP
Top view
(1) to (4)
1
2
3
4
8
(1) (2) (3) (4)
7
(5) (6) (7) (8)
6
(9) (10) (11) (12) (13) (14)
(5) to (8)
(9) to (14)
Product name: 8337 or 8338 (Fixed)
8337 indicates S-8337 Series.
8338 indicates S-8338 Series.
Function code (Refer to Product name vs. Function code)
Lot number
5
Product name vs. Function code
(a) S-8337 Series
Product name
S-8337AAAA-T8T1x
S-8337AAAB-T8T1x
S-8337AAAC-T8T1x
S-8337AABA-T8T1x
S-8337AABB-T8T1x
S-8337AABC-T8T1x
S-8337AACA-T8T1x
S-8337AACB-T8T1x
S-8337AACC-T8T1x
S-8337AADA-T8T1x
S-8337AADB-T8T1x
S-8337AADC-T8T1x
S-8337AAEA-T8T1x
S-8337AAEB-T8T1x
S-8337AAEC-T8T1x
S-8337AAFA-T8T1x
S-8337AAFB-T8T1x
S-8337AAFC-T8T1x
S-8337AAGA-T8T1x
S-8337AAGB-T8T1x
S-8337AAGC-T8T1x
S-8337AAHA-T8T1x
S-8337AAHB-T8T1x
S-8337AAHC-T8T1x
S-8337AAIA-T8T1x
S-8337AAIB-T8T1x
S-8337AAIC-T8T1x
S-8337ABAA-T8T1x
S-8337ABAB-T8T1x
S-8337ABAC-T8T1x
S-8337ABBA-T8T1x
S-8337ABBB-T8T1x
S-8337ABBC-T8T1x
S-8337ABCA-T8T1x
S-8337ABCB-T8T1x
S-8337ABCC-T8T1x
S-8337ABDA-T8T1x
S-8337ABDB-T8T1x
S-8337ABDC-T8T1x
S-8337ABEA-T8T1x
S-8337ABEB-T8T1x
(5)
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
Function code
(6) (7) (8)
A
A
A
A
A
B
A
A
C
A
B
A
A
B
B
A
B
C
A
C
A
A
C
B
A
C
C
A
D
A
A
D
B
A
D
C
A
E
A
A
E
B
A
E
C
A
F
A
A
F
B
A
F
C
A
G
A
A
G
B
A
G
C
A
H
A
A
H
B
A
H
C
A
I
A
A
I
B
A
I
C
B
A
A
B
A
B
B
A
C
B
B
A
B
B
B
B
B
C
B
C
A
B
C
B
B
C
C
B
D
A
B
D
B
B
D
C
B
E
A
B
E
B
Product name
S-8337ABEC-T8T1x
S-8337ABFA-T8T1x
S-8337ABFB-T8T1x
S-8337ABFC-T8T1x
S-8337ABGA-T8T1x
S-8337ABGB-T8T1x
S-8337ABGC-T8T1x
S-8337ABHA-T8T1x
S-8337ABHB-T8T1x
S-8337ABHC-T8T1x
S-8337ABIA-T8T1x
S-8337ABIB-T8T1x
S-8337ABIC-T8T1x
S-8337ACAA-T8T1x
S-8337ACAB-T8T1x
S-8337ACAC-T8T1x
S-8337ACBA-T8T1x
S-8337ACBB-T8T1x
S-8337ACBC-T8T1x
S-8337ACCA-T8T1x
S-8337ACCB-T8T1x
S-8337ACCC-T8T1x
S-8337ACDA-T8T1x
S-8337ACDB-T8T1x
S-8337ACDC-T8T1x
S-8337ACEA-T8T1x
S-8337ACEB-T8T1x
S-8337ACEC-T8T1x
S-8337ACFA-T8T1x
S-8337ACFB-T8T1x
S-8337ACFC-T8T1x
S-8337ACGA-T8T1x
S-8337ACGB-T8T1x
S-8337ACGC-T8T1x
S-8337ACHA-T8T1x
S-8337ACHB-T8T1x
S-8337ACHC-T8T1x
S-8337ACIA-T8T1x
S-8337ACIB-T8T1x
S-8337ACIC-T8T1x
(5)
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
Function code
(6)
(7)
B
E
B
F
B
F
B
F
B
G
B
G
B
G
B
H
B
H
B
H
B
I
B
I
B
I
C
A
C
A
C
A
C
B
C
B
C
B
C
C
C
C
C
C
C
D
C
D
C
D
C
E
C
E
C
E
C
F
C
F
C
F
C
G
C
G
C
G
C
H
C
H
C
H
C
I
C
I
C
I
(8)
C
A
B
C
A
B
C
A
B
C
A
B
C
A
B
C
A
B
C
A
B
C
A
B
C
A
B
C
A
B
C
A
B
C
A
B
C
A
B
C
Remark 1. x: G or U
2. Please select products of environmental code = U for Sn 100%, halogen-free products.
39
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
S-8337/8338 Series
Rev.5.0_00
(b) S-8338 Series
Product name
S-8338AAAA-T8T1x
S-8338AAAB-T8T1x
S-8338AAAC-T8T1x
S-8338AABA-T8T1x
S-8338AABB-T8T1x
S-8338AABC-T8T1x
S-8338AACA-T8T1x
S-8338AACB-T8T1x
S-8338AACC-T8T1x
S-8338AADA-T8T1x
S-8338AADB-T8T1x
S-8338AADC-T8T1x
S-8338AAEA-T8T1x
S-8338AAEB-T8T1x
S-8338AAEC-T8T1x
S-8338AAFA-T8T1x
S-8338AAFB-T8T1x
S-8338AAFC-T8T1x
S-8338AAGA-T8T1x
S-8338AAGB-T8T1x
S-8338AAGC-T8T1x
S-8338AAHA-T8T1x
S-8338AAHB-T8T1x
S-8338AAHC-T8T1x
S-8338AAIA-T8T1x
S-8338AAIB-T8T1x
S-8338AAIC-T8T1x
S-8338ABAA-T8T1x
S-8338ABAB-T8T1x
S-8338ABAC-T8T1x
S-8338ABBA-T8T1x
S-8338ABBB-T8T1x
S-8338ABBC-T8T1x
S-8338ABCA-T8T1x
S-8338ABCB-T8T1x
S-8338ABCC-T8T1x
S-8338ABDA-T8T1x
S-8338ABDB-T8T1x
S-8338ABDC-T8T1x
S-8338ABEA-T8T1x
S-8338ABEB-T8T1x
(5)
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
Function code
(6) (7) (8)
A
A
A
A
A
B
A
A
C
A
B
A
A
B
B
A
B
C
A
C
A
A
C
B
A
C
C
A
D
A
A
D
B
A
D
C
A
E
A
A
E
B
A
E
C
A
F
A
A
F
B
A
F
C
A
G
A
A
G
B
A
G
C
A
H
A
A
H
B
A
H
C
A
I
A
A
I
B
A
I
C
B
A
A
B
A
B
B
A
C
B
B
A
B
B
B
B
B
C
B
C
A
B
C
B
B
C
C
B
D
A
B
D
B
B
D
C
B
E
A
B
E
B
Product name
S-8338ABEC-T8T1x
S-8338ABFA-T8T1x
S-8338ABFB-T8T1x
S-8338ABFC-T8T1x
S-8338ABGA-T8T1x
S-8338ABGB-T8T1x
S-8338ABGC-T8T1x
S-8338ABHA-T8T1x
S-8338ABHB-T8T1x
S-8338ABHC-T8T1x
S-8338ABIA-T8T1x
S-8338ABIB-T8T1x
S-8338ABIC-T8T1x
S-8338ACAA-T8T1x
S-8338ACAB-T8T1x
S-8338ACAC-T8T1x
S-8338ACBA-T8T1x
S-8338ACBB-T8T1x
S-8338ACBC-T8T1x
S-8338ACCA-T8T1x
S-8338ACCB-T8T1x
S-8338ACCC-T8T1x
S-8338ACDA-T8T1x
S-8338ACDB-T8T1x
S-8338ACDC-T8T1x
S-8338ACEA-T8T1x
S-8338ACEB-T8T1x
S-8338ACEC-T8T1x
S-8338ACFA-T8T1x
S-8338ACFB-T8T1x
S-8338ACFC-T8T1x
S-8338ACGA-T8T1x
S-8338ACGB-T8T1x
S-8338ACGC-T8T1x
S-8338ACHA-T8T1x
S-8338ACHB-T8T1x
S-8338ACHC-T8T1x
S-8338ACIA-T8T1x
S-8338ACIB-T8T1x
S-8338ACIC-T8T1x
(5)
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
Function code
(6)
(7)
B
E
B
F
B
F
B
F
B
G
B
G
B
G
B
H
B
H
B
H
B
I
B
I
B
I
C
A
C
A
C
A
C
B
C
B
C
B
C
C
C
C
C
C
C
D
C
D
C
D
C
E
C
E
C
E
C
F
C
F
C
F
C
G
C
G
C
G
C
H
C
H
C
H
C
I
C
I
C
I
Remark 1. x: G or U
2. Please select products of environmental code = U for Sn 100%, halogen-free products.
40
(8)
C
A
B
C
A
B
C
A
B
C
A
B
C
A
B
C
A
B
C
A
B
C
A
B
C
A
B
C
A
B
C
A
B
C
A
B
C
A
B
C
+0.3
3.00 -0.2
8
5
1
4
0.17±0.05
0.2±0.1
0.65
No. FT008-A-P-SD-1.2
TITLE
TSSOP8-E-PKG Dimensions
No.
FT008-A-P-SD-1.2
ANGLE
UNIT
mm
ABLIC Inc.
4.0±0.1
2.0±0.05
ø1.55±0.05
0.3±0.05
+0.1
8.0±0.1
ø1.55 -0.05
(4.4)
+0.4
6.6 -0.2
1
8
4
5
Feed direction
No. FT008-E-C-SD-1.0
TITLE
TSSOP8-E-Carrier Tape
FT008-E-C-SD-1.0
No.
ANGLE
UNIT
mm
ABLIC Inc.
13.4±1.0
17.5±1.0
Enlarged drawing in the central part
ø21±0.8
2±0.5
ø13±0.5
No. FT008-E-R-SD-1.0
TITLE
TSSOP8-E-Reel
No.
FT008-E-R-SD-1.0
QTY.
ANGLE
UNIT
mm
ABLIC Inc.
3,000
13.4±1.0
17.5±1.0
Enlarged drawing in the central part
ø21±0.8
2±0.5
ø13±0.5
No. FT008-E-R-S1-1.0
TITLE
TSSOP8-E-Reel
No.
FT008-E-R-S1-1.0
QTY.
ANGLE
UNIT
mm
ABLIC Inc.
4,000
Disclaimers (Handling Precautions)
1.
All the information described herein (product data, specifications, figures, tables, programs, algorithms and
application circuit examples, etc.) is current as of publishing date of this document and is subject to change without
notice.
2.
The circuit examples and the usages described herein are for reference only, and do not guarantee the success of
any specific mass-production design.
ABLIC Inc. is not liable for any losses, damages, claims or demands caused by the reasons other than the products
described herein (hereinafter "the products") or infringement of third-party intellectual property right and any other
right due to the use of the information described herein.
3.
ABLIC Inc. is not liable for any losses, damages, claims or demands caused by the incorrect information described
herein.
4.
Be careful to use the products within their ranges described herein. Pay special attention for use to the absolute
maximum ratings, operation voltage range and electrical characteristics, etc.
ABLIC Inc. is not liable for any losses, damages, claims or demands caused by failures and / or accidents, etc. due to
the use of the products outside their specified ranges.
5.
Before using the products, confirm their applications, and the laws and regulations of the region or country where they
are used and verify suitability, safety and other factors for the intended use.
6.
When exporting the products, comply with the Foreign Exchange and Foreign Trade Act and all other export-related
laws, and follow the required procedures.
7.
The products are strictly prohibited from using, providing or exporting for the purposes of the development of
weapons of mass destruction or military use. ABLIC Inc. is not liable for any losses, damages, claims or demands
caused by any provision or export to the person or entity who intends to develop, manufacture, use or store nuclear,
biological or chemical weapons or missiles, or use any other military purposes.
8.
The products are not designed to be used as part of any device or equipment that may affect the human body, human
life, or assets (such as medical equipment, disaster prevention systems, security systems, combustion control
systems, infrastructure control systems, vehicle equipment, traffic systems, in-vehicle equipment, aviation equipment,
aerospace equipment, and nuclear-related equipment), excluding when specified for in-vehicle use or other uses by
ABLIC, Inc. Do not apply the products to the above listed devices and equipments.
ABLIC Inc. is not liable for any losses, damages, claims or demands caused by unauthorized or unspecified use of
the products.
9.
In general, semiconductor products may fail or malfunction with some probability. The user of the products should
therefore take responsibility to give thorough consideration to safety design including redundancy, fire spread
prevention measures, and malfunction prevention to prevent accidents causing injury or death, fires and social
damage, etc. that may ensue from the products' failure or malfunction.
The entire system in which the products are used must be sufficiently evaluated and judged whether the products are
allowed to apply for the system on customer's own responsibility.
10. The products are not designed to be radiation-proof. The necessary radiation measures should be taken in the
product design by the customer depending on the intended use.
11. The products do not affect human health under normal use. However, they contain chemical substances and heavy
metals and should therefore not be put in the mouth. The fracture surfaces of wafers and chips may be sharp. Be
careful when handling these with the bare hands to prevent injuries, etc.
12. When disposing of the products, comply with the laws and ordinances of the country or region where they are used.
13. The information described herein contains copyright information and know-how of ABLIC Inc. The information
described herein does not convey any license under any intellectual property rights or any other rights belonging to
ABLIC Inc. or a third party. Reproduction or copying of the information from this document or any part of this
document described herein for the purpose of disclosing it to a third-party is strictly prohibited without the express
permission of ABLIC Inc.
14. For more details on the information described herein or any other questions, please contact ABLIC Inc.'s sales
representative.
15. This Disclaimers have been delivered in a text using the Japanese language, which text, despite any translations into
the English language and the Chinese language, shall be controlling.
2.4-2019.07
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