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Teilenummer | RAA230401 |
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Beschreibung | 3-ch Step-Down Switching Regulator + 1-ch LDO | |
Hersteller | Renesas | |
Logo | ||
Gesamt 29 Seiten RAA23040x
3-ch Step-Down Switching Regulator + 1-ch LDO
Datasheet
R18DS0004EJ0102
Rev.1.02
Jul.09, 2013
Description
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
Package
32-pin VQFN
32-pin TQFP
Packing
Embossed taping. 4,000pcs/reel
Tray. 1,250pcs/Inner box
R18DS0004EJ0102 Rev. 1.02
Jul.09, 2013
Page 1 of 26
Pin Function
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
Symbol
LOUT1
VPIN1
PGND1
II1
PG1
CTL4
SCP
II2
VPIN2
OUT2
VREF
AVDD
AGND
TEST2
VREG
TEST1
LOUT3
VPIN3
PGND3
II3
II4
PGND4
VPIN4
LOUT4
SHDNB4
SHDNB3
SAVE
SS
RT
SHDNB2
SHDNB1
SHDNB0
I/O
Output
Power supply
Ground
Input
Output
Input
—
Input
Power supply
Output
Output
Power supply
Ground
—
Output
—
Output
Power supply
Ground
Input
Input
Ground
Power supply
Output
Input
Input
Input
—
—
Input
Input
Input
Function
Inductor connection for ch1
Output stage power input of ch1
Power ground
Inverted input for error amplifier of ch1
Power-good output of ch1 (open-drain)
Output voltage setting mode of ch4
Capacitor connection pin for timer latch
Inverted input for error amplifier of ch2
Output stage power input of ch2
Output of ch2
Reference voltage output
Analog block power supply
Analog ground
Test pin 2 (connect to VREG)
Internal power supply output
Test pin 1 (connect to AGND)
Inductor connection for ch3
Output stage power input of ch3
Power ground
Inverted input for error amplifier of ch3
Inverted input for error amplifier of ch4
Power ground
Output stage power input of ch4
Inductor connection for ch4
Output ON/OFF of ch4
Output ON/OFF of ch3
Low power operation mode setting pin
Resistance connection for soft start time setting
Resistance connection for triangular wave generation
Output ON/OFF of ch2
Output ON/OFF of ch1
Output ON/OFF of IC
R18DS0004EJ0102 Rev. 1.02
Jul.09, 2013
Page 6 of 26
6 Page Start-up waveforms
Example 1 ch1(3.3V) ->ch2(3.3V) ->ch3(2.5V) ->ch4(1.2V)
Configuration
Waveform
Example 2 ch1(1.2V) ->ch2(1.2V) ->ch3(1.2V) ->ch4(1.2V)
Configuration
Waveform
SHDNB pins have pull-down resistors (400kΩ).
Please make sure that input voltage divided by
external resistor on SHDNB pins shall not be
lower than 1.4V.
R18DS0004EJ0102 Rev. 1.02
Jul.09, 2013
Page 12 of 26
12 Page | ||
Seiten | Gesamt 29 Seiten | |
PDF Download | [ RAA230401 Schematic.PDF ] |
Teilenummer | Beschreibung | Hersteller |
RAA230401 | 3-ch Step-Down Switching Regulator + 1-ch LDO | Renesas |
RAA230402 | 3-ch Step-Down Switching Regulator + 1-ch LDO | Renesas |
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