DATA SHEET
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High Efficiency, High
Current Serial LED Driver
with 30 V Integrated Switch
FAN5333A, FAN5333B
SOT−23, LEAD−5
CASE 527AH
Description
The FAN5333A/FAN5333B is a general purpose LED driver that
features fixed frequency mode operation and an integrated FET
switch. The device’s high output power makes it suitable to drive flash
LEDs in serial connections. This device is designed to operate at high
switching frequencies in order to minimize switching noise measured
at the battery terminal of hand−held communications equipment.
Quiescent current in both normal and shutdown mode is designed to be
minimal in order to extend battery life. Normal or shutdown mode can
be selected by a logic level shutdown circuitry.
The low ON−resistance of the internal N−channel switch ensures
high efficiency and low power dissipation. A cycle−by−cycle current
limit circuit keeps the peak current of the switch below a typical value
of 1.5 A. The FAN5333A/FAN5333B is available in a 5−lead SOT23
package.
MARKING DIAGRAM
33BM
33B
M
ORDERING INFORMATION
Package
Shipping†
FAN5333ASX
SOT−23−5
(Pb-Free/
Halide Free)
3000 /
Tape & Reel
FAN5333BSX
SOT−23−5
(Pb-Free/
Halide Free)
3000 /
Tape & Reel
Device
Features
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•
1.5 MHz Switching Frequency
Low Noise
Adjustable Output Voltage
Up to 1.5 A Peak Switch Current
1.5 W Output Power Capability
Low Shutdown Current: < 1 A
Cycle−by−Cycle Current Limit
Low Feedback Voltage
Over−Voltage Protection
Fixed−Frequency PWM Operation
Internal Compensation
FAN5333A has 110 mV Feedback Voltage
FAN5333B has 315 mV Feedback Voltage
Thermal Shutdown
5−Lead SOT23 Package
These Devices are Pb−Free and Halide Free
= Specific Device Code
= Date Code
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specifications
Brochure, BRD8011/D.
Applications
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Cell Phones
PDAs
Handheld Equipment
Display Bias
LED Bias
Flash LED
© Semiconductor Components Industries, LLC, 2005
February, 2022 − Rev. 2
1
Publication Order Number:
FAN5333B/D
FAN5333A, FAN5333B
TYPICAL APPLICATION
BAT54
L
VIN
CIN
5
ON
OFF
0.1 F
to
2.2 F
SW 1
VIN
FAN5333
4.7 F
to
10 F
6.8 H to 10 H
FB
VOUT
COUT
ILED
3
R
GND 2
4 SHDN
ILED2
ILED1
R1
R2
Figure 1. Typical Application Diagram
PIN ASSIGNMENT & DESCRIPTION
SW
1
GND
2
FB
3
5
4
VIN
SHDN
SOT−23 LEAD−5
Figure 2. Pin Assignment
Table 1. PIN DESCRIPTION
Pin
Name
1
SW
2
GND
3
FB
4
SHDN
5
VIN
Description
Switching Node
Analog and Power Ground
Feedback Pin. Feedback node that connects to an external current set resistor
Shutdown Control Pin. Logic HIGH enables, logic LOW disables the device
Input Voltage Pin
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2
FAN5333A, FAN5333B
Table 2. ABSOLUTE MAXIMUM RATINGS
Parameter
Min
Max
Unit
6.0
V
FB, SHDN to GND
−0.3
VIN + 0.3
V
SW to GND
−0.3
35
V
Lead Soldering Temperature (10 seconds)
300
°C
Junction Temperature
150
°C
VIN to GND
Storage Temperature
−55
Thermal Resistance (JA)
Electrostatic Discharge Protection (ESD) Level (Note 1)
HBM
CDM
150
°C
210
°C/W
kV
2
1
Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality
should not be assumed, damage may occur and reliability may be affected.
1. Using EIA/JESD22A114B (Human Body Model) and EIA/JESD22C101−A (Charge Device Model).
Table 3. RECOMMENDED OPERATING CONDITIONS
Max
Unit
Input Voltage
Parameter
Min
1.8
5.5
V
Output Voltage
VIN
30
V
Operating Ambient Temperature
−40
Output Capacitance Rated at the Required Output (Note 2) for Maximum Load Current
0.47
Type
25
85
°C
F
Functional operation above the stresses listed in the Recommended Operating Ranges is not implied. Extended exposure to stresses beyond
the Recommended Operating Ranges limits may affect device reliability.
2. This load capacitance value is required for the loop stability. Tolerance, temperature variation, and voltage dependency of the capacitance
must be considered. Typically a 1 F ceramic capacitor is required to achieve specified value at VOUT = 30 V.
Table 4. ELECTRICAL CHARACTERISTICS
Unless otherwise noted, VIN = 3.6 V, VOUT = 20 V, ILED = 20 mA, TA = −40°C to 85°C, Typical values are at TA = 25°C, Test Circuit,
Figure 3.
Parameter
Conditions
Min
Type
Max
Unit
121
331
mV
Feedback Voltage
FAN5333A
FAN5333B
99
299
110
315
Switch Current Limit
VIN = 3.2 V
1.1
1.5
Load Current Capability
VOUT ≤ 20 V, VIN = 3.2 V
65
Switch On−resistance
VIN = 5 V
VIN = 3.6 V
0.6
0.7
Quiescent Current
VSHDN = 3.6 V, No Switching
0.6
OFF Mode Current
VSHDN = 0 V
0.1
Shutdown Threshold
Device ON
Device OFF
Shutdown Pin Bias Current
VSHDN = 0 V or VSHDN = 5.5 V
1.5
Feedback Pin Bias Current
Feedback Voltage Line Regulation
2.7 V < VIN < 5.5 V, VOUT ≤ 20 V
mA
3
0.5
A
V
1
300
nA
1
300
nA
0.3
Switching Frequency
1.2
1.5
Maximum Duty Cycle
87
93
Switch Leakage Current
A
mA
No Switching, VIN = 5.5 V
%
1.8
MHz
%
1
A
OVP
15
%
Thermal Shutdown Temperature
150
°C
Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product
performance may not be indicated by the Electrical Characteristics if operated under different conditions.
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3
FAN5333A, FAN5333B
TEST CIRCUIT
BAT54
L
VIN
CIN
10 H
1 F
10 F
4
ON
OFF
SHDN
COUT
ILED
1
SW
VIN
FAN5333
5
VOUT
Electronic Load
FB
GND
3
R
2
Figure 3. Test Circuit
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4
FAN5333A, FAN5333B
TYPICAL CHARACTERISTICS
TA = 25°C, CIN = 4.7 F, COUT = 0.47 F, L = 10 H, unless otherwise noted.
100
100
VOUT = 15 V
VOUT = 9 V
90
Efficiency (%)
Efficiency (%)
90
80
ILED = 40 mA
ILED = 10 mA
70
ILED = 30 mA
ILED = 20 mA
60
50
2.0
2.5
80
ILED = 40 mA
ILED = 30 mA
70
ILED = 20 mA
60
3.0
3.5
4.0
5.0
4.5
50
5.5
ILED = 10 mA
2.0
3.0
2.5
Figure 4. Efficiency vs. Input Voltage
200
COUT = 1 F
150
VOUT = 15 V
Maximum Load Current (mA)
Maximum Load Current (mA)
200
CIN = 10 F
COUT = 1 F
TA = 25°C
TA = 40°C
100
TA = 85°C
50
0
2
3
CIN = 10 F
COUT = 1 F
150
100
VOUT = 12.3 V
VOUT = 9.3 V
50
VOUT = 14.2 V
2.0
2.5
Input Voltage(V)
2.0
VIN = 2.2 V
VOUT = 15 V
SW Frequency (MHz)
LED Current (mA)
3.5
4.0
Figure 7. Maximum Load Current vs. Input Voltage
10.8
10.4
VIN = 3.6 V
10.2
3.0
Input Voltage(V)
Figure 6. Maximum Load Current vs. Input Voltage
10.6 VIN = 5.5 V
5.5
ILED 5%
0
5
4
5.0
4.5
Figure 5. Efficiency vs. Input Voltage
300
250
4.0
Input Voltage(V)
Input Voltage(V)
ILED 5%
3.5
10.0
9.8
VOUT = 15 V
1.8
VIN = 5.5 V
1.6
VIN = 3.6 V
1.4
VIN = 2.2 V
9.6
−40
−20
0
20
40
1.2
−40
80
60
−20
0
20
40
60
80
Temperature (5C)
Temperature (5C)
Figure 9. SW Frequency vs Temperature
Figure 8. LED Current vs Temperature
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FAN5333A, FAN5333B
TYPICAL CHARACTERISTICS (Continued)
TA = 25°C, CIN = 4.7 F, COUT = 0.47 F, L = 10 H, unless otherwise noted.
25
Output
Voltage
(5 V/div)
VOUT = 15 V
L = 10 F
CIN = 10 F
COUT = 1 F
VIN = 2.7 V
15
EN
Battery
Voltage
Current
(5 V/div) (0.5 A/div)
LED Current (mA)
20
10
5
0
3
2
5
4
Input Voltage(V)
Time (100 ms/div)
Figure 10. Load Current vs. Input Voltage
Figure 11. Start−Up Response
BLOCK DIAGRAM
SHDN
V IN
SW
5
1
4
Shutdown
Circuitry
FB
+
Over
Voltage
−
1.15 x VREF
Thermal
Shutdown
R
FB
−
Error
Amp
+
3
+
Comp
S
n
Driver
−
Reference
R
Ramp
Generator
Q
R
S
Current Limit
Comparator
−
+
Oscillator
+
Amp
30m
−
2
Figure 12. Block Diagram
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6
GND
FAN5333A, FAN5333B
APPLICATIONS INFORMATION
CIRCUIT DESCRIPTION
The FAN5333A/FAN5333B is a pulse−width modulated
(PWM) current−mode boost converter. The FAN5333A/
FAN5333B improves the performance of battery powered
equipment by significantly minimizing the spectral
distribution of noise at the input caused by the switching
action of the regulator. In order to facilitate effective noise
filtering, the switching frequency was chosen to be high,
1.5 MHz. The device architecture is that of a current mode
controller with an internal sense resistor connected in series
with the N−channel switch. The voltage at the feedback pin
tracks the output voltage at the cathode of the external
Schottky diode (shown in the test circuit). The error
amplifier amplifies the difference between the feedback
voltage and the internal band− gap reference. The amplified
error voltage serves as a reference voltage to the PWM
comparator. The inverting input of the PWM comparator
consists of the sum of two components: the amplified
control signal received from the 30 m current sense
resistor and the ramp generator voltage derived from the
oscillator. The oscillator sets the latch, and the latch turns on
the FET switch. Under normal operating conditions, the
PWM comparator resets the latch and turns off the FET, thus
terminating the pulse. Since the comparator input contains
information about the output voltage and the control loop is
arranged to form a negative feedback loop, the value of the
peak inductor current will be adjusted to maintain
regulation.
Every time the latch is reset, the FET is turned off and the
current flow through the switch is terminated. The latch can
be reset by other events as well. Over−current condition is
monitored by the current limit comparator which resets the
latch and turns off the switch instantaneously within each
clock cycle.
Setting the Output Current
The internal reference (VREF) is 110 mV (Typical) for
FAN5333A and 315 mV (Typical) for FAN5333B. The
output current is set by a resistor divider R connected
between FB pin and ground. The output current is given by:
I LED +
V FB
R
(eq. 1)
Inductor Selection
The inductor parameters directly related to device
performances are saturation current and dc resistance. The
FAN5333A/ FAN5333B operates with a typical inductor
value of 10 H. The lower the dc resistance, the higher the
efficiency. Usually a trade−off between inductor size, cost
and overall efficiency is needed to make the optimum
choice.
The inductor saturation current should be rated around
1 A, in an application having the LED current near the
maximum current as indicated in “Typical Performance
Characteristics”. The peak inductor current is limited to
1.5 A by the current sense loop. This limit is reached only
during the start−up and with heavy load condition; when this
event occurs the converter can shift over in discontinuous
conduction mode due to the automatic turn−off of the
switching transistor, resulting in higher ripple and reduced
efficiency
Some recommended inductors are suggested in the table
below:
Table 5. RECOMMENDED INDUCTORS
Over−Voltage Protection
The voltage on the feedback pin is sensed by an OVP
Comparator. When the feedback voltage is 15% higher than
the nominal voltage, the OVP Comparator stops switching
of the power transistor, thus preventing the output voltage
from going higher.
Inductor
Value
Vendor
Part Number
10 H
TDK
SLF6025&−100M1R0
10 H
MURATA
LQH66SN100M01C
Highest
Efficiency
10 H
COOPER
SD414−100
Small Size
Comment
Capacitors Selection
For best performance, low ESR input and output
capacitors are required. Ceramic capacitors of CIN = 10 F
and COUT = 1 F placed as close to the IC pins, are required
for the maximum load (65 mA). For the lighter load
(≤ 20 mA) the capacitances may be reduced to CIN = 4.7 F
and COUT = 0.47 F or even to 0.1 F, if higher ripple is
acceptable. The output capacitor voltage rating should be
according to the VOUT setting. Some capacitors are
suggested in the table below:
OPEN−CIRCUIT PROTECTION
As in any current regulator, if the feedback loop is open,
the output voltage increases until it is limited by some
additional external circuitry. In the particular case of the
FAN5333, the output voltage is limited by the switching
transistor breakdown at around 45 V, typically (assuming
that COUT and the Schottky diode rating voltage are higher).
Since at such high output voltage the output current is
inherently limited by the discontinuous conduction mode, in
most cases, the switching transistor enters non−destructive
breakdown and the IC survives.
However, to ensure 100% protection for LED
disconnection, we recommend limiting VOUT with an
external Zener diode or stopping the boost switching with an
external voltage supervisory circuit.
Table 6. RECOMMENDED CAPACITORS
Capacitor Value
Vendor
Part Number
0.47 H
Panasonic
ECJ−3YB1E474K
1 H
MURATA
GRM21BR61E105K
10 H
MURATA
GRM21BR61A106K
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FAN5333A, FAN5333B
Diode Selection
2. Dimming Using DC Voltage
The external diode used for rectification is usually
a Schottky diode. Its average forward current and reverse
voltage maximum ratings should exceed the load current
and the voltage at the output of the converter respectively.
A barrier Schottky diode such as BAT54 is preferred, due to
its lower reverse current over the temperature range. Care
should be taken to avoid any short circuit of VOUT to GND,
even with the IC disabled, since the diode can be instantly
damaged by the excessive current
An external adjustable DC voltage (See Figure 15)
between 0 V to 2 V can control the LED’s current from
15 mA to 0 mA, respectively.
FAN5333B
FAN5333A
FB
FB
1.6 k
5
VDC
90 k
15
4.7 k
VDC
90 k
Figure 15. Dimming Using DC Voltage
BRIGHTNESS CONTROL
1. Dimming Using PWM Logic Signal
A PWM signal applied to SHDN (See Figure 14) can
control the LED’s brightness in direct dependence with the
duty cycle. The maximum frequency should not exceed
1kHz to ensure a linear dependence of the LED’s average
current. The amplitude of the PWM signal should be suitable
to turn the FAN5333 ON and OFF. Alternatively, a PWM
logic signal can be used to switch a FET ON/OFF to change
the resistance that sets the LED’s current (See Figure 14).
Adjusting the duty cycle from 0% to 100% results in varying
the LED’s current between IMIN and IMAX.
Where:
V FB
V FB
I MIN +
and I MAX +
R MIN
R MIN ø R SET
3. Dimming Using Filtered PWM Signal
This method allows the use of a greater than 1 kHz PWM
frequency signal with minimum impact on the battery
ripple. The filtered PWM signal (See Figure 16) acts as an
adjustable DC voltage as long as its frequency is
significantly higher than the corner frequency of the RC low
pass filter.
FAN5333A
FB
5
20 k 15 k
1.6 k
0.1 F
(eq. 2)
FAN5333B
FB
FAN5333
SHDN
15
4.7 k
20 k
15 k
0.1 F
Figure 16. Dimming Using Filtered PWM Signal
Figure 13. Dimming Using a PWM Signal
THERMAL SHUTDOWN
When the die temperature exceeds 150°C, a reset occurs
and will remain in effect until the die cools to 130°C, at that
time the circuit will be allowed to restart.
FAN5333
PCB LAYOUT RECOMMENDATIONS
The inherently high peak currents and switching
frequency of power supplies require careful PCB layout
design. Therefore, use wide traces for high current paths and
place the input capacitor, the inductor, and the output
capacitor as close as possible to the integrated circuit
terminals. The FB pin connection should be routed away
from the inductor proximity to prevent RF coupling. A PCB
with at least one ground plane connected to pin 2 of the IC
is recommended. This ground plane acts as an
electromagnetic shield to reduce EMI and parasitic coupling
between components.
FB
RSET
RMIN
Figure 14. Dimming Using a PWM Logic Signal
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8
MECHANICAL CASE OUTLINE
PACKAGE DIMENSIONS
SOT−23, 5 Lead
CASE 527AH
ISSUE A
DATE 09 JUN 2021
q
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q
q1
q2
GENERIC
MARKING DIAGRAM*
XXXM
XXX = Specific Device Code
M = Date Code
*This information is generic. Please refer to
device data sheet for actual part marking.
Pb−Free indicator, “G” or microdot “G”, may
or may not be present. Some products may
not follow the Generic Marking.
DOCUMENT NUMBER:
DESCRIPTION:
98AON34320E
SOT−23, 5 LEAD
Electronic versions are uncontrolled except when accessed directly from the Document Repository.
Printed versions are uncontrolled except when stamped “CONTROLLED COPY” in red.
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