RAA23022x RAA23023x
Datasheet
RAA23022x RAA23023x
16V Input, 3A, Dual Step-Down DC/DC Converter
+ Battery Backup
R18DS0017EJ0100
REV.1.00
Apr.21.2015
Description
The RAA23022x and RAA23023x are dual step-down DC/DC converter, 4.5V to 16V input voltage rage and 3A
output current. Auto PFM mode makes devices low power operation at light load, so it makes a system lower
power.
The RAA23022x is suitable for battery backup system using lithium primary cell with built-in battery backup
circuit.
Features
z DC/DC
Input voltage range
4.5V to 16V
Shutdown current
1uA (typ.)
Auto PFM mode
Maximum output current
3A
Synchronous rectification type step-down DC/DC
Integrated power MOSFETs
Switching frequency
1.1MHz (fixed)
Output voltage range
0.8V to 6V
Internal phase compensator
Soft start
2ms (fixed)
Discharge circuit
Power Good
Battery backup circuit (RAA23022x)
z Protection circuit
Short circuit protection (latch type)
Thermal shutdown circuit
165°C (typ.)
Under voltage lockout circuit (recovery type)
z Package
20-pin HTSSOP
Application
Communication (Router, Home Gate Way, Radio, etc.)
Industrial (Surveillance camera, Various controller, etc.)
Building (Security device, Emergency device, Various controller, etc.)
OA (Printer, Plane paper copier, etc.)
Smart meter
Smart home appliances
And, usable various application
Note: The information contained in this document is being issued in advance of the production cycle for the product.
The parameters for the product may change before final production, or Renesas Electronics Corporation, at its
own discretion, may withdraw the product prior to its production.
A quality grade of these ICs is “Standard”. Recommended applications are indicated below.
Computers, office equipment, communications equipment, test and measurement equipment,
audio and visual equipment, home electronic appliances, machine tools, personal electronic equipment,
and industrial robots, etc.
R18DS0017EJ0100 REV.1.00
Apr.21.2015
Page 1 of 30
RAA23022x RAA23023x
Product Lineup Table
Part number
Output
Type
VIN
range
RAA230221
2
Step-down + BB*1
4.5 to 16V
RAA230222
2
Step-down + BB*1
4.5 to 16V
RAA230223
2
Step-down + BB*1
4.5 to 16V
RAA230231
2
Step-down
4.5 to 16V
RAA230232
2
Step-down
4.5 to 16V
RAA230233
2
Step-down
4.5 to 16V
Note
VOUT
CH1 3.3V (fixed)
CH2 0.8V to 6.0V*2
CH1 3.3V (fixed)
CH2 5.0V (fixed)
CH1 and CH2
0.8V to 6.0V*2
CH1 3.3V (fixed)
CH2 0.8V to 6.0V*2
CH1 3.3V (fixed)
CH2 5.0V (fixed)
CH1 and CH2
0.8V to 6.0V*2
IOUT
(max.)
Switching
frequency
3A
1.1MHz
3A
1.1MHz
3A
1.1MHz
3A
1.1MHz
3A
1.1MHz
3A
1.1MHz
*1 BB : Battery Backup
*2 Adjustable by external resistors
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RAA23022x RAA23023x
Circuit example
RAA23022x (2CH DCDC + Battery Backup, VOUT set by external resistors)
0.47uF
RAA23023x (2CH DCDC, VOUT set by external resistors)
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RAA23022x RAA23023x
Block Diagram
RAA23022x (2CH DCDC + Battery backup, VOUT set by external resistors)
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RAA23022x RAA23023x
RAA23023x (2CH DCDC, VOUT set by external resistors)
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RAA23022x RAA23023x
Pin Function
RAA23022x (2CH DCDC + Battery backup)
Pin No.
1
2
3
Symbol
PGND1
LX1
Boost1
VIN1
I/O
I/O
O
I
4
5
6
7
I
VOUT1
FB1
GND
I
I
I/O
8
VREG
O
9
PGOOD
O
10
x_AutoPFM
I
11
12
VBB_IN
VBB_OUT
I
O
13
EN1
I
14
EN2
I
15
16
17
FB2
VOUT2
VIN2
I
I
I
Boost2
I
LX2
PGND2
O
I/O
18
19
20
R18DS0017EJ0100 REV.1.00
Apr.21.2015
Function
CH1 Power Ground
CH1 Inductor connection
CH1 Boot strap input
(Connect 0.1uF capacitor between LX1 and Boost1)
CH1 Power supply
CH1 VOUT feedback
CH1 Feedback resistor connection
Analog Ground
Internal power supply output
(Connect 1uF capacitor between VREG and AGND)
Power good output (open drain)
CH1 and CH2 stop
:L
CH1 or CH2 operation : HiZ
Auto PFM mode ON/OFF
x_AutoPFM=”L” : Auto PFM mode (change automatically)
PFM mode at light load
PWM mode at heavy load
x_AutoPFM=“H” : PWM mode (fixed)
Battery connection
Backup voltage output
CH1 enable
EN1=“L” : CH1 Stop
EN1=”H” : CH1 Operation
CH2 enable
EN2=“L” : CH2 Stop
EN2=”H” : CH2 Operation
CH2 Feedback resistor connection
CH2 VOUT feedback
CH2 Power supply
CH2 Boot strap input
(Connect 0.1uF capacitor between LX2 and Boost2)
CH2 Inductor connection
CH2 Power Ground
Page 6 of 30
RAA23022x RAA23023x
RAA23023x (2CH DCDC)
Pin No.
1
2
3
Symbol
PGND1
LX1
Boost1
4
5
6
7
VOUT1
FB1
GND
I
I
I/O
8
VREG
O
9
PGOOD
O
10
x_AutoPFM
I
11
12
GND
GND
I/O
I/O
13
EN1
I
14
EN2
I
15
16
17
FB2
VOUT2
VIN2
I
I
I
Boost2
I
LX2
PGND2
O
I/O
18
19
20
VIN1
I/O
I/O
O
I
R18DS0017EJ0100 REV.1.00
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I
Function
CH1 Power Ground
CH1 Inductor connection
CH1 Boot strap input
(Connect 0.1uF capacitor between LX1 and Boost1)
CH1 Power supply
CH1 VOUT feedback
CH1 Feedback resistor connection
Analog Ground
Internal power supply output
(Connect 1uF capacitor between VREG and AGND)
Power good output (open drain)
CH1 and CH2 stop
:L
CH1 or CH2 operation : HiZ
Auto PFM mode ON/OFF
x_AutoPFM=”L” : Auto PFM mode (change automatically)
PFM mode at light load
PWM mode at heavy load
x_AutoPFM=“H” : PWM mode (fixed)
Analog Ground
Analog Ground
CH1 enable
EN1=“L” : CH1 Stop
EN1=”H” : CH1 Operation
CH2 enable
EN2=“L” : CH2 Stop
EN2=”H” : CH2 Operation
CH2 Feedback resistor connection
CH2 VOUT feedback
CH2 Power supply
CH2 Boot strap input
(Connect 0.1uF capacitor between LX2 and Boost2)
CH2 Inductor connection
CH2 Power Ground
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RAA23022x RAA23023x
Absolute Maximum Ratings
(Unless otherwise specified, TA = 25°C,)
Parameter
VIN applied voltage
EN applied voltage
x_AutoPFM applied voltage
PGOOD voltage
FB applied voltage
VOUT applied voltage
VBB_IN applied voltage (RAA23022x)
Symbol
Ratings
Unit
Condition
VIN
-0.3 to +17.6
V
VIN1, VIN2
EN
-0.3 to +17.6
V
EN1, EN2
x_AutoPFM
-0.3 to +17.6
V
x_AutoPFM
PGOOD
-0.3 to +6.5
V
PGOOD
FB
-0.3 to +6.5
V
FB1, FB2
VOUT
-0.3 to +6.5
V
VOUT1, VOUT2
VBB_IN
-0.3 to +6.5
V
VBB_IN
VIN input current(peak)
IVIN(peak)-
4.2
A
VIN1, VIN2
LX output current(peak)
ILX(peak)+
4.2
A
LX1, LX2
VOUT sink current (DC)
IVOUT(DC)-
100
mA
When discharge circuit
GND
-0.3 to +0.3
V
PGND1, PGND2, GND
Total power dissipation
PT
3400*1
mW
TA≦＋25℃
Operating ambient temperature
TA
-40 to +85
°C
Operation junction temperature
TJ
-40 to +125
°C
Tstg
-55 to +150
°C
VOUT1, VOUT2
operation
GND voltage
Storage temperature
Note:
*1
This is the value at TA < +25°C. At TA > +25°C, the total power dissipation decrease with −34 mW/°C.
Board specification : 4 layers glass epoxy board, 76.2mm x 114.3mm x 1.664mm.
Copper coverage area: 50%, 0.070mm thickness (top and bottom layers)
95%, 0.035mm thickness ( layers 2 and 3)
Connecting exposed pad
Caution: Product quality may suffer if the absolute maximum rating is exceeded even momentarily for any parameter.
That is, the absolute maximum ratings are rated values at which the product is on the verge of suffering
physical damage, and therefore the product must be used under conditions that ensure that the absolute
maximum ratings are not exceeded.
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RAA23022x RAA23023x
Recommended Operating Condition
(Unless otherwise specified, TA = 25°C)
Parameter
Symbol
MIN.
VIN applied voltage
VIN
EN applied voltage
EN
x_AutoPFM applied voltage
TYP.
MAX.
Unit
4.5
16.0
V
VIN1, VIN2
0
16.0
V
EN1, EN2 *1
x_AutoPFM
0
16.0
V
x_AutoPFM
6.0
V
PGOOD
FB1, FB2
At external resistor
setting
PGOOD
0
FB applied voltage
FB
0
6.0
V
VOUT setting range
Vdcdc_ext
*2
6.0
V
PGOOD voltage
Condition
*1 About rising time (tr) and falling time (tf) of input signal to EN1 and EN2 pin, when EN1 and EN2 pin are not
connected to power supply pin (VIN1, VIN2), set tr and tf less than 100ms.
When EN1, EN2 pin are connected to VIN1, VIN2 pin, there are no restriction.
VIN1, 2
90%
EN1, 2
90%
10%
10%
*2 Output voltage (minimum value)
7.0
1.5
1.4
6.0
1.3
Vout [V]
Vout [V]
5.0
Output voltage area
4.0
3.0
1.2
1.1
1.0
0.9
2.0
0.8
1.0
9V
0.7
0.0
0.6
4.0
8.0
12.0
VIN [V]
R18DS0017EJ0100 REV.1.00
Apr.21.2015
16.0
4.0
8.0
12.0
16.0
VIN [V]
Page 9 of 30
RAA23022x RAA23023x
Electrical Characteristics
(Unless otherwise specified, TA = 25°C, VIN1 = VIN2 = 12V)
Parameter
Total
Symbol
Shutdown current
Under
voltage lock
out circuit
(UVLO)
Internal
power
supply
(VREG)
MIN.
IDD(SHDN)
TYP.
MAX.
Unit
1
10
uA
Condition
EN1 = EN2 = GND
VIN1 and VIN2 rising are
detected
VIN1 and VIN2 falling are
detected
Operating start voltage
Vrls(vin)
3.6
3.9
4.2
V
Operating stop voltage
Vdet(vin)
3.4
3.7
4.0
V
Internal power supply voltage
VREG
4.7
5.0
5.3
V
Ireg = 0mA, VIN1 = 6V to 16V
E/A feedback voltage
vref07
0.693
0.700
0.707
V
Include input offset
at external resistor setting
+2.5
%
Fixed VOUT products
Output
Output voltage accuracy
(PWM mode)
High side FET on-resistance
Vacc
Ronh
180
mΩ
Io=100mA
Low side FET on-resistance
Ronl
130
mΩ
Io=-100mA
Discharge
circuit
On-resistance
Rondc
—
100
200
Ω
Soft start
Soft start time *1
tss
1.2
2
3.5
ms
Thermal
shutdown
circuit
Logic input
Detect temperature
*2
Hysteresis temperature
*2
165
°C
20
°C
CH1, CH2, Io=15mA
High level threshold voltage
VIH
1.3
VIN+0.3
V
EN1, EN2, x_AutoPFM
Low level threshold voltage
VIL
-0.3
0.4
V
EN1, EN2, x_AutoPFM
Input current
IEN
uA
EN1 = 3.3V, EN2 = 3.3V
x_AutoPFM = 3.3V
VBB_IN input voltage range
VBB
On-resistance between
Battery
VBB_IN and VBB_OUT
backup
On-resistance between
(RAA23022x) VOUT1 and VBB_OUT
VBB leak current *1
Note:
-2.5
1
2.7
3.0
3.7
V
Ron_vbat
400
Ω
VBB_OUT = VBB_IN, Io=0.5mA
Ron_vout1
100
Ω
VBB_OUT = VOUT1, Io=0.5mA
IL_BB
0.5
uA
VBB_OUT = VBB_IN = 3.0V,
No load
*1 Reference value
*2 Not production tested.
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RAA23022x RAA23023x
Typical Performance Characteristics
(Unless otherwise specified, TA = 25°C)
Efficiency vs. Output Current
CH1 Vout=3.3V,
Auto PFM mode
VIN=8V
CH2 Vout=5.0V,
Auto PFM mode
VIN=8V
VIN=12V
VIN=12V
VIN=16V
VIN=16V
Output voltage vs. Output Current
CH1 Vout=3.3V,
CH2 Vout=5.0V,
Auto PFM mode
Auto PFM mode
Start-up and Shutdown Waveforms
12.0V
12.0V
EN1/EN2
(5.0V/Div)
VOUT2
(1.0V/Div)
5.0V
5.0V
3.3V
3.3V
VOUT1
(1.0V/Div)
2ms/Div
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2ms/Div
Page 11 of 30
RAA23022x RAA23023x
Operation Waveforms
CH1 VIN=12V, Vout=3.3V, Iout=3.0A
Auto_PFM mode
VOUT1
(AC 20mV/Div)
CH2 VIN=12V, Vout=5.0V, Iout=3.0A
Auto PFM mode
VOUT2
(AC 20mV/Div)
LX2
(10.0V/Div)
LX1
(10.0V/Div)
1us/Div
1us/Div
CH1 VIN=12V, Vout=3.3V, Iout=0.01A
Auto_PFM mode
CH2 VIN=12V, Vout=5.0V, Iout=0.01A
Auto PFM mode
VOUT2
(AC 20mV/Div)
VOUT1
(AC 20mV/Div)
LX2
(10.0V/Div)
LX1
(10.0V/Div)
10us/Div
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20us/Div
Page 12 of 30
RAA23022x RAA23023x
Load Step Transient Waveforms
CH1 VIN=12V, Vout=3.3V, Iout=0.01A-1.0A
Auto_PFM mode
CH2 VIN=12V, Vout=5.0V, Iout=0.01A-1.0A
Auto PFM mode
VOUT1
(AC 100mV/Div)
VOUT2
(AC 100mV/Div)
IOUT1
(1.0A/Div)
IOUT2
(1.0A/Div)
200us/Div
CH1 VIN=12V, Vout=3.3V, Iout=0.01A-2.0A
PWM mode
200us/Div
CH2 VIN=12V, Vout=5.0V, Iout=0.01A-2.0A
PWM mode
VOUT1
(AC 100mV/Div)
VOUT2
(AC 100mV/Div)
IOUT1
(1.0A/Div)
IOUT2
(1.0A/Div)
200us/Div
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200us/Div
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RAA23022x RAA23023x
Battery Backup circuit : VBB_OUT changing Waveform (RAA23022x)
VIN=8.0V, VOUT1=3.3V, VBB_OUT output current =10uA, VBB_OUT capacitor = 0.47uF
(1) Battery Voltage (VBB_IN pin)=3.0V、VOUT1=3.3V
VBB_OUT
(0.2V/Div)
3.3V
3.3V
VIN
(2V/Div)
VOUT1
(2V/Div)
3.0V
3.0V
8.0V
8.0V
3.3V
3.3V
0V
0V
20ms/Div
20ms/Div
(2) Battery Voltage(VBB_IN pin) = 3.6V、VOUT1=3.3V
VBB_OUT
(0.2V/Div)
3.3V
VIN
(2V/Div)
8.0V
3.6V
3.6V
3.3V
8.0V
3.3V
3.3V
VOUT1
(2V/Div)
0V
0V
20ms/Div
20ms/Div
Temperature Derating Curve
4000
3500
Pr (mW)
3000
2500
2000
1500
1000
500
0
0
25
50
75
100
125
TA(℃)
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RAA23022x RAA23023x
Detailed Description
Control Block
EN1, EN2 : ON/OFF setting
EN1
L
EN2
L
State
VREG
Shutdown
0V
(CH1 and CH2 stop)
L
CH1 Operation
5.0V
H
CH2 Stop
H
H
CH1 and CH2 Operation
5.0V
H
Ch1 Stop
5.0V
L
CH2 Operation
Note: L: Low level, H: High level
There is no pull-down resistor within EN1 and EN2 pin because of reducing power consumption at light load.
Fix EN1 and EN2 pin to high level or low.
x_autoPFM : AutoPFM mode/ PWM mode setting
x_autoPFM
L
Operation
Auto PFM mode (change automatically)
PFM mode at light load
PWM mode at heavy load
H
PWM mode (fixed)
Note: L: Low level, H: High level
There is no pull-down resistor within x_autoPFM pin because of reducing power consumption at light load.
Fix x_autoPFM pin to high level or low.
PGOOD : Power Good output
State
PGOOD
CH1 and CH2 stop
L
CH1 or CH2 operation
HiZ
Note: L: Low level, H: High level
When using this function, connect PGOOD pin to VREG, VOUT1, VOUT2, etc.
When VREG voltage falls under 3.7V, PGOOD pin becomes high impedance though CH1 and CH2 stop.
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Page 15 of 30
RAA23022x RAA23023x
Auto PFM mode
RAA23022x and RAA23023x have Auto PFM mode to achieve high efficiency over a wide load
current range. The devices operate with PFM (Pulse Frequency Modulation) mode at light load
current, and PWM (Pulse Width Modulation) mode at heavy load current. An operation mode is
automatically switched depending on load current.
When a bottom of inductor ripple current is under 0A, reverse current flow at low-side N-channel
MOSFET of output block. The devices operate with PFM mode during detecting this current.
A current of switching PFM / PWM mode (Ichange) is calculated by an equation below.
L : inductance, fSW : 1.1MHz
Switching
voltage
RAA23022x
RAA23023x
Reverse
current
detect
Reverse
current
Inductor
current
Reverse current flow
when a bottom of inductor
ripple current is under 0A.
RAA23022x and RAA23023x have x_autoPFM pin. When Low level, the devices operate Auto PFM
mode (PFM mode / PWM mode changed automatically). When High level, the devices operate
PWM mode, then not change into Auto PFM mode.
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RAA23022x RAA23023x
Soft Start
To limit the startup inrush current and output voltage overshoot, a soft start circuit is used to
ramp up the reference voltage from 0 V to its final value linearly. When EN pin is set from low
level to high level, the device starts operation and output voltage rises with soft start. Both CH1
and CH2 soft start time are fixed at 2ms(Typ.) and no additional components are needed. Soft
start feature gradually increases the error amplifier (E/A) input threshold voltage by using the
voltage that is generated by the digital soft start (DSS) circuit.
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RAA23022x RAA23023x
Discharge Circuit
The device has discharge circuit in both CH1 and CH2. This enables a rapid discharge without an
external MOSFET. When an EN pin is changed from high level to low, each discharge switch in
VOUT pin is turned on and all capacitors which are connected to each output are rapidly
discharged through VOUT pin.
When VIN pin voltage becomes low level, discharge switches become off because there are no
voltage to keep them on. The control voltage of discharge switches is VREG, and the discharge
time of VREG capacitor is over 100ms when VIN voltage falls down, so even if EN pin is connected
to VIN pin, an output voltage can be discharged because VREG voltage level can keep the
discharge switches on.
Discharge time can be calculated by an equation below.
Vdc is a voltage after tdc(s).
CALL is sum of all capacitance which are connected to CH1 or CH2 output (output capacitor,
bypass capacitor around MCU, etc.).
Rondc is on resistance of discharge circuit.
VIN
CH1
Output
Control
VREG
VIN1
Device A
LX1
Device B
PGND1
Device C
VOUT1
Discharge
Control
CH2
Output
Control
VIN2
Device D
LX2
Device E
PGND2
Device F
Discharge
Control
VOUT2
Note : These dashed arrows are discharge line.
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RAA23022x RAA23023x
Power Good
Power Good is an open-drain output that requires a pull − up resistor (Recommended value =
100kΩ). PGOOD pin becomes high impedance (HiZ) when either CH1 or CH2 FB pin voltage and
thus its output voltage rises above 80% of nominal regulation point. If it is pulled-up, PGOOD
output high level. PGOOD pin goes low when both CH1 or CH2 output voltage falls below 80% of
the regulation point. When both EN1 and EN2 pin goes low level, PGOOD pin becomes HiZ
because VREG is used for power good control and it fall down at this time. So, if PGOOD pin is
connected to VIN, its status becomes high level even if CH1 and CH2 stop. PGOOD pin must be
pulled up to CH1 output, CH2 output or VREG when using this function.
CH1 and CH2 can be started in order by connecting PGOOD pin to EN1 or EN2. This function can
be also used for sequence signal for other devices.
Circuit example when CH2 is started after CH1
EN1
CH1
EN2
CH2
PGOOD
100kΩ
Power good
control
VREG
VREG
1uF
EN1
VREG
VOUT1
2ms
(1ms)
PGOOD
EN2
VOUT2
2ms
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RAA23022x RAA23023x
Battery Backup (RAA23022x)
RAA23022x has a battery backup circuit which is used to operate some devices at system power-off.
The circuit can be easily designed by RAA23022x without two diodes.
When CH1 operates, VBB_OUT = VOUT1. When CH1 stops and VOUT1 pin voltage is higher than
VBB_IN pin, VBB_OUT = VOUT1 pin. When CH1 stops and VOUT1 pin voltage is lower than
VBB_IN pin, VBB_OUT = VBB_IN pin.
VBB_OUT voltage value is dependent on on-resistance between VBB_IN and VBB_OUT,
On-resistance between VOUT1 and VBB_OUT and VBB_OUT output current. VBB_OUT can be
calculated by equations below.
1. Normal operation mode (VBB_OUT = VOUT1)
2. Battery backup mode (VBB_OUT = VBB_IN)
VBB_OUT : VBB_OUT voltage (V)
VOUT1 : VOUT1 voltage = CH1 output voltage (V)
VBB_IN : VBB_IN voltage = Battery voltage (V)
IBB_OUT : VBB_OUT output current (A)
Ron_vout1 : On resistance between VOUT1 and VBB_OUT 100Ω (Typ.)
Ron_vbat : On resistance between VBB_IN and VBB_OUT 400Ω (Typ.)
Note : 2.7V ≤ VBB_OUT ≤ 3.7V
Connect over 0.47uF capacitor to VBB_OUT pin.
Note : POK1 is an IC internal signal which identifies CH1 operating status.
It cannot be seen from IC outside.
VBB_OUT pin output status
CH1
Operation
(POK1 = H)
VOUT1, VBB_IN
VOUT1 ≥ VBB_IN
or
VOUT1 < VBB_IN
VBB_OUT
VOUT1
Stop
(POK1 = L)
VOUT1 ≥ VBB_IN
VOUT1 < VBB_IN
VOUT1
VBB_IN
Note : L: Low level, H: High level
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Page 20 of 30
RAA23022x RAA23023x
Timing chart of battery backup
1. With 3.0V battery
2. With 3.6V battery
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Page 21 of 30
RAA23022x RAA23023x
Protection Circuit View
Protection
circuit
Short circuit
protection
(SCP)
Function
Detect output voltage
dropping because of short
circuit, etc.
(Latch type)
Detect rise up of IC internal
Thermal
temperature
shutdown
(Over 165˚C)
circuit
(Auto recovery type)
(TSD)
Under voltage
Detect dropping of VIN
lockout circuit
(Auto recovery type)
(UVLO)
Note SCP : Short Circuit Protection
TSD : Thermal Shutdown Circuit
UVLO : Under Voltage Lockout Circuit
Operation status
Common circuit
CH1, CH2
(VREG, etc.)
Output
Reset
Turn EN1 and EN2 pin from
high level to low level
or
Drop VIN1 and VIN2 pin
voltage under operation stop
voltage of UVLO
Operation
Latched to off
Operation
Stop
The temperature falls
Operation
Stop
Up VIN1 and VIN2 over
operating start voltage (3.9V)
Short Circuit Protection (Latch type)
When CH1 or CH2 output voltage drops, each FB pin input voltage also drops. If this voltage falls
below the input detection voltage (0.35V(typ.)) of the short circuit protection, the outputs both CH1
and CH2 are stopped (latched to OFF). At this time, common circuits (such as VREG, etc.) continue
operating.
When the protection is operating, to reset the latch, either turn the EN1 pin and EN2 pin from high
to low or drop the VIN1 pin and VIN2 voltage under operation stop voltage of UVLO.
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RAA23022x RAA23023x
Thermal Shutdown Circuit (Auto Recovery Type)
When overheating has been detected (detect temperature: 165°C ), the outputs both CH1 and CH2 is stopped.
Then, power MOSFET of output both high side and low side are turned off. Common circuits (such as VREG,
etc.) continue operating.
If the device temperature falls and becomes under detect temperature, the protection is canceled and output
automatically resumes.
Under Voltage Lockout Circuit (Auto Recovery Type)
(1) Under voltage lockout operation
When the power supply voltage (VIN1 and VIN2) falls to the operation stop voltage (3.7V), output from all
channels stops. Common circuits (such as VREG, etc.) continue operating.
(2) Restoring output
Once VIN1 and VIN2 is restored to the Operating start voltage (3.9V), the under voltage lockout operation is
canceled and output automatically resumes. The output voltage cannot be restored while the under voltage
lockout circuit is operating, not even by manipulating the EN pin.
Current Limiting
If an overcurrent occurs, an output current is limited on a pulse-by-pulse basis. If the current sensor detects an
overcurrent, the current is limited and the switching operation of the Power MOSFET in the output stage stops
until the next cycle.
When an output current is limited, the output voltage drops. If a FB pin voltage falls below the input detection
voltage, the short-circuit protection circuit starts operating.
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Page 23 of 30
RAA23022x RAA23023x
Guide for Circuit Design
Setting Output Voltage (When the output voltage is set by external resistor)
The output voltage can be calculated by an equation below.
VOUT = 0.7 x (1 + R1 / R2)
VOUT
R1
-
R2
+
0.7V
Examples of R1 and R2 selection
Vout
0.9V
1.0V
1.05V
1.1V
1.18V
1.2V
1.5V
1.8V
2.5V
3.3V
5.0V
R1
110k
100k
100k
91k
110k
130k
150k
130k
100k
100k
110k
R2
390k
240k
200k
160k
160k
180k
130k
82k
39k
27k
18k
Output voltage accuracy (When the output voltage is set by external resistor)
Output voltage accuracy can be calculated by an equation below.
VOUTACC is the output voltage accuracy (%).
VITHACC is the E/A input threshold voltage accuracy (%).
VOUT is the output voltage (V).
RACC is the external resistor accuracy (%).
So, an output voltage accuracy of the device is below.
Note : These equation don’t include Vout fluctuation by load step transient.
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Page 24 of 30
RAA23022x RAA23023x
Inductor selection
An inductor target is that ripple current (∆IL) of inductor becomes 10 to 40 % of Iout(max).
When ∆IL increases, inductor current peak raises, so ripple of Vout gets larger and power loss increases. But,
large size inductor is required to lower ∆IL.
∆IL can be calculated by an equation below.
fsw is 1.1MHz.
Peak current of inductor (ILpeak) can be calculated by an equation below.
Choose a inductor which saturation current is higher than ILpeak .
Inductor Example
Inductance
(uH)
Inductor
Manufacturer
ITEMP (A)
ISAT
(A)
Size
(LxWxT, mm)
2.2
NRS5024T2R2NMGJ
TAIYO YUDEN
3.1
4.1
4.9x4.9x2.4
2.2
744778002
WURTH
4.0
4.8
7.3x7.3x3.2
3.3
NRS5030T3R3MMGJ
TAIYO YUDEN
3.0
3.6
4.9x4.9x3.1
3.3
7447789003
WURTH
3.4
4.2
7.3x7.3x3.2
4.7
NRS5040T4R7NMGK
TAIYO YUDEN
3.1
3.3
4.9x4.9x4.1
4.7
744777004
WURTH
4.0
4.0
7.3x7.3x4.3
Note ITEMP : Rated current by temperature rising
ISAT : Rated current by inductance loss
These inductors are examples. About inductor detail, contact each manufacturer
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Page 25 of 30
RAA23022x RAA23023x
Output capacitor selection
RAA23022x and RAA23023x have a phase compensation circuit which is optimized to DC/DC operation. In
order to operate stably with the phase compensation, connect the output capacitor which is over 22 uF. Ceramic
capacitor can be used for output capacitor. It has low ESR, so VOUT ripple is decreased.
VOUT ripple (∆Vrpl) can be calculated by an equation below.
ESR : Equivalent Series Resistance
Input capacitor selection
Connect an input capacitor which is over 10 uF between each VIN pin and power ground. It should be placed
close to the device as possible.
VREG capacitor
Connect 1uF ceramic capacitor to VREG pin.
Bootstrap capacitor
Connect 0.1uF ceramic capacitor between LX pin and Boost pin.
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Page 26 of 30
RAA23022x RAA23023x
Feedback capacitor
When PFM operation at Auto PFM mode, feedback capacitor can be connected in parallel to high side output
voltage setting resistor to adjust phase characteristic. If connected, there are possibility that operation in large
current (at PWM operation) is not stable. Confirm the operation with system status.
VOUT
VOUT
Feedback
Capacitor
R1
FB
R2
When using feedback capacitor with an output voltage fixed product, connect feedback capacitor between VOUT
pin and FB pin.
Connect FB capacitor between
VOUT pin and FB pin
Example of RAA230232
When not using feedback capacitor with an output voltage fixed product, keep FB pin open.
Keep FB pin open
Example of RAA230232
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RAA23022x RAA23023x
Components example
VIN (V)
12
5
VOUT (V)
L (uH)
Cout (uF)
5V
3.3V
1.2V
3.3
1.2
3.3
3.3
3.3
2.2
2.2
22 to 44
22 to 44
22 to 44
22
22
R18DS0017EJ0100 REV.1.00
Apr.21.2015
CFB (pF)
Auto PFM mode
0 to 100
0 to 100
0 to 100
0 to 100
0 to 100
PWM mode
No need
No need
No need
No need
No need
Page 28 of 30
RAA23022x RAA23023x
Notes on Use
VIN Applied Voltage
Be sure to apply the same voltage toVIN1 pin and VIN2 pin.
Pattern Wiring
To actually perform pattern wiring, separate a ground of control signal from a ground of a power line, so that
these grounds do not have a common impedance as much as possible.
Connection of Exposed PAD
HTSSOP package has an Exposed PAD on the bottom to improve radiation performance. On the mounting board,
connect this Exposed PAD to PGND or GND.
Fixed Usage of Control Input Pin
When EN pin and x_AutoPFM pin are fixed, connect to a pin listed below.
Input Pin
EN1
EN2
x_AutoPFM
R18DS0017EJ0100 REV.1.00
Apr.21.2015
Connect Pin
Fixed to Low Level
Fixed to High Level
GND
VIN
GND
VIN
GND
VIN
Page 29 of 30
RAA23022x RAA23023x
Package Dimensions
20pin HTSSOP
Renesas code : PTSP0020JF-A
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Apr.21.2015
Page 30 of 30
Revision History
Rev.
1.00
Date
Apr.21. 2015
RAA23022x, RAA23023x Datasheet
Page
-
Description
Summary
First Edition issued
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