RAA23014x RAA23015x
Datasheet
RAA23014x RAA23015x
28.0V Input, Step-Down DC/DC Converter
+ Battery Backup
Description
The RAA23014x and RAA23015x are 1CH step-down DC/DC converter, 7V to 28V input voltage range. Auto
PFM mode makes devices low power operation at light load, so it makes a system lower power.
The RAA23014x is suitable for battery backup system using lithium primary cell with built-in battery backup
circuit.
R18DS0019EJ0100
REV.1.00
Sep.09.2015
Features
DC/DC
Synchronous rectification type step-down DC/DC
Auto PFM mode
Battery backup circuit (RAA23014x)
Input voltage range
7V to 28V
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
Protection circuit
Short circuit protection (latch type)
Thermal shutdown circuit
165
°C
(typ.)
Under voltage lockout circuit (recovery type)
Package
16-pin HTSSOP (RAA23014x)
8-pin HLSOP (RAA23015x)
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: A quality grade of the devices 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.
R18DS0019EJ0100 REV.1.00
Sep.09.2015
Page 1 of 25
RAA23014x RAA23015x
Pin Function
RAA23014x (1CHDCDC + Battery backup)
Pin No.
1
2
3
4
5
Symbol
VOUT
FB
VBB_IN
VBB_OUT
EN
I/O
I
I
I
O
I
Function
VOUT feedback
Feedback resistor connection
Battery connection
Backup voltage output
Device enable
EN=“L” : Disable (shutdown)
EN=”H” : Enable (operation)
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)
Internal power supply output
(Connect 1uF capacitor between VREG and GND)
Ground
Ground
Ground
Ground
Inductor connection
Boot strap input (Connect 0.1uF capacitor between LX and Boost)
Power supply
Ground
Ground
6
x_AutoPFM
I
7
8
9
10
11
12
13
14
15
16
VREG
GND
GND
GND
GND
LX
Boost
VIN
GND
GND
O
I/O
I/O
I/O
I/O
O
I
I
I/O
I/O
RAA23015x (1CHDCDC)
Pin No.
1
2
3
Symbol
VOUT
FB
VREG
I/O
I
I
O
Function
VOUT feedback
Feedback resistor connection
Internal power supply output
(Connect 1uF capacitor between VREG and GND)
Device enable
EN=“L” : Disable (shutdown)
EN=”H” : Enable (operation)
Ground
Inductor connection
Boot strap input (Connect 0.1uF capacitor between LX and Boost)
Power supply
4
5
6
7
8
EN
GND
LX
Boost
VIN
I
I/O
O
I
I
R18DS0019EJ0100 REV.1.00
Sep.09.2015
Page 5 of 25
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