Page 1 of 26
RAA23012x RAA23013x
R18DS0015EJ0100 REV.1.00
Apr.15.2015
Description
The RAA23012x and RAA23013x are 1CH 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 RAA23012x is suitable for battery backup system using lithium primary cell with built-in battery backup
circuit.
Features
z DC/DC
Synchronous rectification type step-down DC/DC
Auto PFM mode
Battery backup circuit (RAA23012x)
Input voltage range 4.5V to 16V
Output voltage range 0.8V to 6V
Maximum output current 3A
Shutdown current 1uA (typ.)
Switching frequency 1.1MHz (fixed)
Soft start 2ms (fixed)
Integrated power MOSFETs
Discharge circuit
Internal phase compensator
z Protection circuit
Short circuit protection (latch type)
Thermal shutdown circuit 165°C (typ.)
Under voltage lockout circuit (recovery type)
z Package
16-pin HTSSOP (RAA23012x)
8-pin HLSOP (RAA23013x)
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 RAA23012x series 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.
RAA23012x RAA23013x
16V Input, 3A, Step-Down DC/DC Converter
+ Batter
y
Backu
p
R18DS0015EJ0100
REV.1.00
Ap
r.15.2015
Datasheet
Page 2 of 26
RAA23012x RAA23013x
R18DS0015EJ0100 REV.1.00
Apr.15.2015
Product Lineup Table
Part
number Output Type
V
IN
range VOUT IOUT
(max.) Package Switching
frequency
RAA230121 1 Step-down + BB*1 4.5 to 16V 3.3V(fixed) 3A 16pin HTSSOP 1.1MHz
RAA230122 1 Step-down + BB*1 4.5 to 16V 5.0V(fixed) 3A 16pin HTSSOP 1.1MHz
RAA230123 1 Step-down + BB*1 4.5 to 16V 0.8V to 6.0V*2 3A 16pin HTSSOP 1.1MHz
RAA230131 1 Step-down 4.5 to 16V 3.3V(fixed) 3A 8pin HLSOP 1.1MHz
RAA230132 1 Step-down 4.5 to 16V 5.0V(fixed) 3A 8pin HLSOP 1.1MHz
RAA230133 1 Step-down 4.5 to 16V 0.8V to 6.0V*2 3A 8pin HLSOP 1.1MHz
Note *1 BB : Battery Backup
*2 Adjustable by external resistors
Circuit example
RAA23012x (1CHDCDC + Battery Backup, VOUT set by external resistors)
RAA23013x (1CHDCDC, VOUT set by external resistors)
Page 3 of 26
RAA23012x RAA23013x
R18DS0015EJ0100 REV.1.00
Apr.15.2015
Block Diagram
RAA23012x (1CHDCDC + Battery backup, VOUT set by external resistors)
Page 4 of 26
RAA23012x RAA23013x
R18DS0015EJ0100 REV.1.00
Apr.15.2015
RAA23013x (1CHDCDC, VOUT set by external resistors)
Page 5 of 26
RAA23012x RAA23013x
R18DS0015EJ0100 REV.1.00
Apr.15.2015
Pin Function
RAA23012x (1CHDCDC + Battery backup)
Pin No. Symbol I/O Function
1 VOUT I VOUT feedback
2 FB I Feedback resistor connection
3 VBB_IN I Battery connection
4 VBB_OUT O Backup voltage output
5 EN I
Device enable
EN=“L” : Disable (shutdown)
EN=”H” : Enable (operation)
6 x_AutoPFM I
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)
7 VREG O
Internal power supply output
(Connect 1uF capacitor between VREG and GND)
8 GND I/O Ground
9 GND I/O Ground
10 GND I/O Ground
11 GND I/O Ground
12 LX O Inductor connection
13 Boost I Boot strap input (Connect 0.1uF capacitor between LX and Boost)
14 VIN I Power supply
15 GND I/O Ground
16 GND I/O Ground
RAA23013x (1CHDCDC)
Pin No. Symbol I/O Function
1 VOUT I VOUT feedback
2 FB I Feedback resistor connection
3 VREG O
Internal power supply output
(Connect 1uF capacitor between VREG and GND)
4 EN I
Device enable
EN=“L” : Disable (shutdown)
EN=”H” : Enable (operation)
5 GND I/O Ground
6 LX O Inductor connection
7 Boost I Boot strap input (Connect 0.1uF capacitor between LX and Boost)
8 VIN I Power supply
Page 6 of 26
RAA23012x RAA23013x
R18DS0015EJ0100 REV.1.00
Apr.15.2015
Absolute Maximum Ratings
(Unless otherwise specified, TA = 25°C)
Parameter Symbol Ratings Unit Condition
VIN applied voltage VIN -0.3 to +17.6 V VIN
EN applied voltage EN -0.3 to +17.6 V EN
x_AutoPFM applied voltage (RAA23012x) x_AutoPFM -0.3 to +17.6 V x_AutoPFM
FB applied voltage FB -0.3 to +6.5 V FB
VOUT applied voltage VOUT -0.3 to +6.5 V VOUT
VBB_IN applied voltage (RAA23012x) VBB_IN -0.3 to +6.5 V VBB_IN
VIN input current(peak) IVIN(peak)- 4.2 A VIN
LX output current(peak) ILX(peak)+ 4.2 A LX
VOUT sink current (DC) IVOUT(DC)- 100 mA
VOUT
When discharge circuit
operation
GND voltage GND -0.3 to +0.3 V GND
Total power dissipation 16pin HTSSOP PT 2900*1 mW TA≦＋25℃
8pin HLSOP PT 2600*2
Operating ambient temperature TA -40 to +85 °C
Operating junction temperature TJ -40 to +125 °C
Storage temperature Tstg -55 to +150 °C
Note: *1 This is the value at TA < +25°C. At TA > +25°C, the total power dissipation decrease with -29.0 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
*2 This is the value at TA < +25°C. At TA > +25°C, the total power dissipation decrease with -26.0 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.
Page 7 of 26
RAA23012x RAA23013x
R18DS0015EJ0100 REV.1.00
Apr.15.2015
Recommended Operating Condition
(Unless otherwise specified, TA = 25°C)
Parameter Symbol MIN. TYP. MAX. Unit Condition
VIN applied voltage VIN 4.5 16.0 V VIN
EN applied voltage EN 0 16.0 V EN*1
x_AutoPFM applied voltage x_AutoPFM 0 16.0 V x_AutoPFM
FB applied voltage FB 0 6.0 V FB
VOUT setting range Vdcdc_ext *2 6.0 V VOUT set by
external resistors
*1 About rising time (tr) and falling time (tf) of input signal to EN pin, when EN pin are not connected to power supply pin
(VIN), set tr and tf less than 100ms.
When EN pin are connected to VIN pin, there are no restriction.
*2 Output voltage (minimum value)
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
4.0 8.0 12.0 16.0
Vout[V]
VIN[V]
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
4.0 8.0 12.0 16.0
Vout[V]
VIN[V]
10%
90% 90%
10%
VIN
EN
9V
Output voltage area
Page 8 of 26
RAA23012x RAA23013x
R18DS0015EJ0100 REV.1.00
Apr.15.2015
Electrical Characteristics
(Unless otherwise specified, TA = 25°C, VIN = 12V)
Parameter Symbol MIN. TYP. MAX. Unit Condition
Tot al Shutdown current IDD(SHDN) 1 10 uA EN=GND
Under
voltage lock
out circuit
(UVLO)
Operating start voltage Vrls(vin) 3.6 3.9 4.2 V VIN rising are detected
Operating stop voltage Vdet(vin) 3.4 3.7 4.0 V VIN falling are detected
Internal
power
supply
(VREG)
Internal power supply voltage VREG 4.7 5.0 5.3 V Ireg = 0mA, VIN=6V to 16V
Output
(PWM mode)
E/A feedback voltage vref07 0.693 0.700 0.707 V Include input offset
at external resistor setting
Output voltage accuracy Vacc -2.5 +2.5 % Fixed VOUT products
High side FET on-resistance Ronh 180 mΩIo=100mA
Low side FET on-resistance Ronl 130 mΩIo=100mA
Discharge
circuit On-resistance Rondc 100 200 Ω Io=15mA
Soft start Soft start time*1 tss 1.2 2 3.5 ms
Thermal
shutdown
circuit
Detect temperature*2 165 °C
Hysteresis temperature*2 20 °C
Logic input
High level threshold voltage VIH 1.3 VIN+0.3 V EN, x_AutoPFM
Low level threshold voltage VIL -0.3 0.4 V EN, x_AutoPFM
Input current IEN 1 uA EN = 3.3V
x_AutoPFM = 3.3V
Battery
backup
(only
RAA23012x)
VBB input voltage range VBB 2.7 3.0 3.7 V
On-resistance between
VBB_IN and VBB_OUT Ron_vbat 400 Ω VBB_OUT = VBB_IN, Io=0.5mA
On-resistance between
VOUT and VBB_OUT Ron_vout 100 Ω VBB_OUT = VOUT, Io=0.5mA
VBB leak current*1 IL_BB 0.5 uA VBB_OUT = VBB_IN = 3.0V,
No load
Note: *1 Reference value
*2 Not production tested.
Page 9 of 26
RAA23012x RAA23013x
R18DS0015EJ0100 REV.1.00
Apr.15.2015
Typical Performance Characteristics
(Unless otherwise specified, TA = 25°C)
Efficiency vs. Output Current
Output voltage vs. Output Current
Start-up and Shutdown Waveforms
RAA230123 Vout=3.3V,
Auto PFM mode
RAA230133 Vout=3.3V,
Auto PFM mode
VIN=8V VIN=12V
VIN=16V
VIN=8V
VIN=12V
VIN=16V
RAA230123 Vout=3.3V,
Auto PFM mode
RAA230133 Vout=3.3V,
Auto PFM mode
EN
(5.0V/Div)
VOUT
(1.0V/Div)
3.3V
12.0V
3.3V
12.0V
2ms/Div 2ms/Div
Page 10 of 26
RAA23012x RAA23013x
R18DS0015EJ0100 REV.1.00
Apr.15.2015
Operation Waveforms
Load Step Transient Waveforms
RAA230123, VIN=12V, Vout=3.3V, Iout=3.0A
PWM mode
RAA230123, VIN=12V, Vout=3.3V, Iout=0.01A
Auto PFM mode
VOUT
(AC 20mV/Div)
VOUT
(AC 20mV/Div)
1us/Div 40us/Div
RAA230123, VIN=12V, Vout=3.3V, Iout=0.01A-2.0
A
PWM mode
RAA230123, VIN=12V, Vout=3.3V, Iout=0.01A-1.0A
Auto PFM mode
VOUT
(AC 100mV/Div)
VOUT
(AC 100mV/Div)
IOUT
(1.0A/Div)
IOUT
(1.0A/Div)
200us/Div 200us/Div
LX
(10V/Div) LX
(10V/Div)
Page 11 of 26
RAA23012x RAA23013x
R18DS0015EJ0100 REV.1.00
Apr.15.2015
Temperature Derating Curve
0
500
1000
1500
2000
2500
3000
3500
0 25 50 75 100 125
Pr(mW)
TA(℃)
0
500
1000
1500
2000
2500
3000
3500
0 25 50 75 100 125
Pr(mW)
TA(℃)
16-pin HTSSOP (RAA23012x)
8-pin HLSOP (RAA23013x)
Page 12 of 26
RAA23012x RAA23013x
R18DS0015EJ0100 REV.1.00
Apr.15.2015
Detailed Description
Control Block
EN : ON/OFF setting
EN state VREG
L Shutdown 0V
H Operation 5.0V
Note: L: Low level, H: High level
Note: There is no pull-down resistor within EN pin because of reducing power consumption at light load. Fix EN pin
to high level or low.
x_autoPFM : AutoPFM mode/ PWM mode setting (only RAA23012x)
x_autoPFM Operation
L 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
Note: 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.
Page 13 of 26
RAA23012x RAA23013x
R18DS0015EJ0100 REV.1.00
Apr.15.2015
Auto PFM mode
RAA23012x and RAA23013x 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
RAA23012x has 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.
RAA23013x operates only Auto PFM mode.
RAA23012x
RAA23013x
Reverse
current
detect
Switching
voltage
Inductor
current
Reverse
current
Reverse current flow
when a bottom of inductor
ripple current is under 0A.
Page 14 of 26
RAA23012x RAA23013x
R18DS0015EJ0100 REV.1.00
Apr.15.2015
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. 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.
Page 15 of 26
RAA23012x RAA23013x
R18DS0015EJ0100 REV.1.00
Apr.15.2015
Discharge Circuit
The device has discharge circuit. This enables a rapid discharge without an external MOSFET.
When an EN pin is changed from high level to low, discharge switch in VOUT pin is turned on and
all capacitors which are connected to DC/DC output are rapidly discharged through VOUT pin.
When VIN pin voltage becomes low level, discharge switch 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, output voltage can be discharged because VREG voltage level can keep the discharge switches
on. When VREG voltage falls, VOUT pin becomes high impedance.
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 output (output capacitor, bypass
capacitor around MCU, etc.).
Rondc is on resistance of discharge circuit.
PGND
LX
VIN
Output
Control
VIN
Device B
Device A
Device C
VREG
Discharge
Control
VOUT
Note : Dashed arrow is discharge line.
Page 16 of 26
RAA23012x RAA23013x
R18DS0015EJ0100 REV.1.00
Apr.15.2015
Battery Backup (RAA23012x)
RAA23012x has a battery backup circuit which is used to operate some devices at system power-off.
The circuit can be easily designed by RAA23012x without two diodes.
When DC/DC operates, VBB_OUT = VOUT. When DC/DC stops and VOUT pin voltage is higher
than VBB_IN pin, VBB_OUT = VOUT pin. When DC/DC stops and VOUT 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 VOUT and VBB_OUT and VBB_OUT output current. VBB_OUT can be
calculated by equations below.
1. Normal operation mode (VBB_OUT = VOUT)
2. Battery backup mode (VBB_OUT = VBB_IN)
VBB_OUT : VBB_OUT voltage (V)
VOUT : VOUT voltage = DC/DC output voltage (V)
V
BB_IN : VBB_IN voltage = Battery voltage (V)
IBB_OUT : VBB_OUT output current (A)
R
on_vout : On resistance between VOUT and VBB_OUT 100Ω (Typ.)
Ron_vbat : On resistance between VBB_IN and VBB_OUT 400Ω (Typ.)
Note : 2.7 ≤ VBB_OUT ≤ 3.7V
Connect over 0.47uF capacitor to VBB_OUT pin.
Note : POK is an IC internal signal which identifies DC/DC operating status.
It cannot be seen from IC outside.
VBB_OUT pin output status
DC/DC VOUT, VBB_IN VBB_OUT
Operation
(POK = H)
VOUT ≥ VBB_IN
or
VOUT < VBB_IN
VOUT
Stop
(POK = L)
VOUT ≥ VBB_IN VOUT
VOUT < VBB_IN VBB_IN
Note : L: Low level, H: High level
Page 17 of 26
RAA23012x RAA23013x
R18DS0015EJ0100 REV.1.00
Apr.15.2015
Timing chart of battery backup
1. With 3.0V battery
2. With 3.6V battery
Page 18 of 26
RAA23012x RAA23013x
R18DS0015EJ0100 REV.1.00
Apr.15.2015
Protection Circuit View
Protection
circuit
Function Operation status Reset
Common circuit
(VREG, etc.)
Output
Short circuit
protection
(SCP)
Detect output voltage
dropping because of short
circuit, etc.
(Latch type) Operation Latched to off
Turn EN pin from high level to
low level
or
Drop VIN pin voltage under
operation stop voltage of
UVLO
Thermal
shutdown
circuit
(TSD)
Detect rise up of IC internal
temperature
(Over 165˚C)
(Auto recovery type)
Operation Stop The temperature falls
Under voltage
lockout circuit
(UVLO)
Detect dropping of VIN
(Auto recovery type) Operation Stop
Up VIN over operating start
voltage (3.9V)
Note SCP : Short Circuit Protection
TSD : Thermal Shutdown Circuit
UVLO : Under Voltage Lockout Circuit
Short Circuit Protection (Latch type)
When output voltage drops, FB pin input voltage also drops. If this voltage falls below the input
detection voltage of the short circuit protection, the output are stopped (latched to OFF). At this
time, common circuits (such as the internal power supply block, etc.) continue operating.
When the protection is operating, to reset the latch, either turn the EN pin from high to low or
drop the VIN pin voltage under operation stop voltage of UVLO.
Thermal Shutdown Circuit (Auto Recovery Type)
When overheating has been detected (detect temperature: 165°C ), the output is stopped. Then, power MOSFET
of output both high side and low side are turned off. Common circuits (such as the internal power supply block,
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 (VIN) falls to the operation stop voltage (3.7V), output from all channels
stops. Common circuits (such as the internal power supply block, etc.) continue operating.
(2) Restoring output
Once VIN 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.
Page 19 of 26
RAA23012x RAA23013x
R18DS0015EJ0100 REV.1.00
Apr.15.2015
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)
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.
-
+
0.7V
VOUT
R1
R2
Page 20 of 26
RAA23012x RAA23013x
R18DS0015EJ0100 REV.1.00
Apr.15.2015
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
Note ITEMP : Rated current by temperature rising
I
SAT : Rated current by inductance loss
These inductors are examples. About inductor detail, contact each manufacturer
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
Page 21 of 26
RAA23012x RAA23013x
R18DS0015EJ0100 REV.1.00
Apr.15.2015
Output capacitor selection
RAA23012x and RAA23013x 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.
Page 22 of 26
RAA23012x RAA23013x
R18DS0015EJ0100 REV.1.00
Apr.15.2015
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.
When using feedback capacitor with an output voltage fixed product, connect feedback capacitor between VOUT
pin and FB pin.
When not using feedback capacitor with an output voltage fixed product, keep FB pin open.
VOUT
R1
R2
FB
Feedback
Capacitor
VOUT
Example of RAA230121, RAA230122
Example of RAA230121, RAA230122
Connect FB capacitor between
VOUT
p
in and FB
p
in
Keep FB pin open
Page 23 of 26
RAA23012x RAA23013x
R18DS0015EJ0100 REV.1.00
Apr.15.2015
Components example
VIN (V) VOUT (V) L (uH) Cout (uF) CFB (pF)
Auto PFM mode PWM mode
12
5V 3.3 22 to 44 0 to 100 No need
3.3V 3.3 22 to 44 0 to 100 No need
1.2V 3.3 22 to 44 0 to 100 No need
5 3.3 2.2 22 0 to 100 No need
1.2 2.2 22 0 to 100 No need
Page 24 of 26
RAA23012x RAA23013x
R18DS0015EJ0100 REV.1.00
Apr.15.2015
Notes on Use
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 and HLSOP packages have an Exposed PAD on the bottom to improve radiation performance. On the
mounting board, connect this Exposed PAD to GND.
Fixed Usage of Control Input Pin
When EN pin and x_AutoPFM pin are fixed, connect to a pin listed below.
Input Pin Connect Pin
Fixed to Low Level Fixed to High Level
EN GND VIN
x_AutoPFM GND VIN
Page 25 of 26
RAA23012x RAA23013x
R18DS0015EJ0100 REV.1.00
Apr.15.2015
Package Dimensions
16pin TSSOP (RAA23012x)
Renesas code : PTSP0016JC-A
Page 26 of 26
RAA23012x RAA23013x
R18DS0015EJ0100 REV.1.00
Apr.15.2015
8pin HLSOP (RAA23013x)
Renesas code : PLSP0008DB-A
All trademarks and registered trademarks are the property of their respective owners.
C - 1
Rev. Date
Description
Page Summary
1.00 Apr.15.2015 - First Edition issued.
Revision History RAA23012x, RAA23013x Data Sheet
Notice
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