BD9123MUV_11 Datasheet, PDF (3/18 Pages) Rohm – Output 1.5A or Less High-efficiency Step-down Switching Regulator with Built-in Power MOSFET

BD9123MUV
●Package outline, SYMBOLS
【BD9123MUV】
D91
23
Lot No.
VQFN016V3030 (Unit:mm)
Fig.1 BD9123MUV Package outline
●Pin No. & function table
●Block Diagram, Application Circuit
VCC
EN
13
VREF
VID<0> 12
VID<1> 11
VID<2> 10
VOUT ₉
VCC
7
PGOOD
SELECTOR
Gm Amp
Soft
Start
Current
Comp
RQ
S
SLOPE CLK
OSC
Vcc
UVLO
Current
Sense/
Protect
+
Driver
Logic
PGOOD
TSD
8 _ITH
RITH
CITH
Technical Note
VCC ^0.1µF
14
PVCC
15
100Ω
Input
16
10µF
SW
1 _4.7µH
2
3
PGND
4
5
6 _GND
Output
22µF
Fig.2 BD9123MUV Block Diagram
VID<0> VID<1> VID<2> VOUT
12 11 10 9
EN 13
8 ^ITH
VCC 14
7 ^PGOOD
PVCC ₁₅
6 GND
PVCC ₁₆
5 PGND
1
23
4
SW SW SW PGND
Fig 3 Top View
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Pin name
SW
PGND
GND
PGOOD
ITH
VOUT
VID<2>
VID<1>
VID<0>
EN
VCC
PVCC
Function
Pch/Nch FET drain output pin
Nch FET source pin
Ground
Power Good pin
Gm Amp output pin/Connected phase
compensation capacitor
Output voltage pin
Output voltage control pin<2>
Output voltage control pin<1>
Output voltage control pin<0>
Enable pin(High Active）
VCC power supply input pin
Pch FET source pin
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3/17
2011.01 - Rev.A