Datasheet
RAA23040x
3-ch Step-Down Switching Regulator + 1-ch LDO
Description
R18DS0004EJ0102
Rev.1.02
Jul.09, 2013
The RAA23040x is a power supply IC that has 3-ch step-down Switching Regulator containing power MOSFETs and
1-ch LDO.
Features
•
Switching Regulator (ch1, ch3, ch4)
Synchronous rectification type step-down circuit
Integrated power MOSFETs
Internal phase compensator
Power good function (ch1)
Low power mode
(ch1, ch3 and ch4 operate at low frequency and reduce the power consumption of the IC.)
Switching frequency: 1.3 MHz to 2 MHz (variable)
Internal timer-latch-type short-circuit protector
•
LDO (ch2)
Internal over current protector (foldback-current limiting)
•
Common part
Independent On/Off control for each channel
Internal digital soft-start function (adjustable soft-start time)
Internal discharge circuit
Internal timer-latch-type thermal shutdown circuit (shutdown temperature: 150°C or higher)
Internal recovery-type under voltage lockout circuit
PKG and Packing
Part No.
RAA23040xGNP
RAA23040xGFT
32-pin VQFN
32-pin TQFP
Package
Packing
Embossed taping. 4,000pcs/reel
Tray. 1,250pcs/Inner box
R18DS0004EJ0102 Rev. 1.02
Jul.09, 2013
Page 1 of 26
Product Lineup Table
The following 9 products are developed based on output voltage.
ch
1
2
3
4
3.3 V
Adjustable
RAA230401
1.8 V
RAA230402
2.5 V
RAA230403
3.0 V
RAA230404
3.3 V
RAA230405
1.8 V
RAA230406
2.5 V
RAA230407
3.0 V
RAA230408
3.3 V
RAA230409
Adjustable
Output voltage is selectable. 1.2 V preset voltage by internal resistor or adjustable by external resistor.
Note:
ch1, ch2: RAA230401 to RAA230408 output preset voltage by internal resistor. RAA230409 outputs adjustable
voltage by external resistor.
ch3: RAA230401 to RAA230404 output preset voltage by internal resistor. RAA230405 to RAA230409 output
adjustable voltage by external resistor.
ch4: All products have switchable output voltage between 1.2 V preset voltage by internal resistor and adjustable
voltage by external resistor.
Constitution Example
•
Input Voltage: 2.5 V to 5.5 V
ch
1
Type
Synchronous rectification
type step-down circuit
(Current mode)
LDO
Synchronous rectification
type step-down circuit
(Current mode)
Synchronous rectification
type step-down circuit
(Current mode)
Power MOSFET
Integrated
Output Voltage
0.9 V to VIN
×
0.8 V
Maximum Output
Current Example
500 mA
2
3
—
Integrated
0.9 V to VIN
×
0.8 V
0.9 V to VIN
×
0.8 V
100 mA
1500 mA
4
Integrated
0.9 V to VIN
×
0.8 V
1500 mA
R18DS0004EJ0102 Rev. 1.02
Jul.09, 2013
Page 2 of 26
Application Circuit Example
ch1 to ch3: Preset output voltage by internal resistor.
ch4: Preset output voltage by internal resistor is selected. (CTL4 = H)
Control-IC
RT
SCP
V
REF
V
REG
AGND
SHDNB0
SHDNB1
SHDNB2
SHDNB3
SHDNB4
SAVE
AVDD
Control Circuit
•
ON/OFF
•
Soft Start
•
Discharge
Short-Circuit
Protection
Circuit SCP
Thermal
Shutdown
Circuit TSD
Reference
Voltage
V
REF
Internal
Power Supply
V
REG
AV
DD
Input voltage
Under Voltage Lockout
Circuit UVLO
TEST1
Oscillator
OSC
TEST Circuit
V
REG
CTL4
SS
TEST2
VP
IN1
ch1 OUT
E/A1
II1
0.8V
+
+
–
Phase
Compensator
ch1 OUT
Output Control
(Current mode
/current limit)
LOUT1
PGND1
1.8V
2.5V
3.0V
3.3V
ch2 OUT
PG1
Control
Discharge Control
VP
IN2
LDO
Discharge Control
OUT2
II2
1.8V
2.5V
3.0V
3.3V
VP
IN3
ch3 OUT
II3
0.8V
E/A3
+
+
–
Phase
Compensator
Discharge Control
ch3 OUT
Output Control
(Current mode
/current limit)
LOUT3
PGND3
3.3V
VP
IN4
ch4 OUT
E/A4
II4
0.8V
+
+
–
Phase
Compensator
Discharge Control
ch4 OUT
Output Control
(Current mode
/current limit)
LOUT4
PGND4
1.2V
R18DS0004EJ0102 Rev. 1.02
Jul.09, 2013
Page 3 of 26
ch1 to ch3: Adjustable output voltage by external resistor.
ch4: Adjustable output voltage by external resistor is selected. (CTL4 = L)
Control-IC
RT
SCP
V
REF
V
REG
AGND
SHDNB0
SHDNB1
SHDNB2
SHDNB3
SHDNB4
SAVE
AVDD
Control Circuit
•
ON/OFF
•
Soft Start
•
Discharge
Short-Circuit
Protection
Circuit SCP
Thermal
Shutdown
Circuit TSD
Reference
Voltage
V
REF
Internal
Power Supply
V
REG
AV
DD
Input voltage
Under Voltage Lockout
Circuit UVLO
TEST1
Oscillator
OSC
TEST Circuit
V
REG
CTL4
SS
TEST2
VP
IN1
ch1 OUT
E/A1
II1
0.8V
+
+
–
Phase
Compensator
ch1 OUT
Output Control
(Current mode
/current limit)
LOUT1
PGND1
0.9V~AV
DD
PG1
Control
Discharge Control
VP
IN2
LDO
Discharge Control
ch2 OUT
OUT2
0.9V~
AV
DD
-0.5V
II2
VP
IN3
ch3 OUT
E/A3
II3
0.8V
+
+
–
Phase
Compensator
Discharge Control
ch3 OUT
Output Control
(Current mode
/current limit)
LOUT3
PGND3
0.9V~AV
DD
ch4 OUT
VP
IN4
E/A4
II4
0.8V
+
+
–
Phase
Compensator
Discharge Control
ch4 OUT
Output Control
(Current mode
/current limit)
LOUT4
PGND4
0.9V~AV
DD
R18DS0004EJ0102 Rev. 1.02
Jul.09, 2013
Page 4 of 26
Pin Configuration
PGND4
PGND3
LOUT4
LOUT3
VP
IN3
VP
IN4
32-pin VQFN
24 23 22 21 20 19 18 17
II4
II3
SHDNB4
25
SHDNB3
26
SAVE
27
SS
28
RT
29
SHDNB2
30
SHDNB1
31
SHDNB0
32
16
TEST1
15
V
REG
14
TEST2
13
AGND
12
AV
DD
11
V
REF
10
OUT2
9
VP
IN2
1
2
3
4
5
6
7
8
LOUT1
VP
IN1
PGND1
(Top view)
II1
PG1
CTL4
SCP
II2
32-pin TQFP
LOUT4
VP
IN4
PGND3
LOUT3
24 23 22 21 20 19 18 17
PGND4
VP
IN3
II4
II3
SHBND4 25
SHBND3 26
SAVE
SS
RT
27
28
29
16
15
14
13
12
11
10
Exposed PAD
9
TEST1
V
REG
TEST2
AGND
AV
DD
V
REF
OUT2
VP
IN2
SHBND2 30
SHBND1 31
SHBND0 32
1
LOUT1
2
VP
IN1
3
PGND1
4
II1
5
PG1
6
CTL4
7
SCP
8
II2
(Top view)
R18DS0004EJ0102 Rev. 1.02
Jul.09, 2013
Page 5 of 26
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