BD9151MUV Datasheet, PDF (3/17 Pages) Rohm – Output 1.5A or Less High Efficiency Step-down Switching Regulator with Built-in Power MOSFET

BD9151MUV
●Block Diagram
VCC
Technical Note
VOUT3
AVCC
UVLO/
Delay
PGATEB
PGATE MONI
PGOOD
AGND Comp
VOUT1
FB1
VCC
EN
ITH1
AGND
VOUT2
FB2
ITH2
AGND
Gm Amp
Current
Comp
RQ
S
Slope1
Soft
Start
SCP1
VREF
CLK1
OSC
SCP/
TSD
CLK2
SCP2
Gm Amp
Current
Comp
RQ
S
Slope2
Soft
Start/
Delay
CLK2
Current
Sense/
Protect
+
Driver
Logic
Delay
UVLO
Delay
Current
Sense/
Protect
+
Driver
Logic
VCC
RESET
VCC
PVCC1
SW1
PGND1
VCC
PVCC2
SW2
PGND2
VOUT1
VOUT2
AGND
Fig.2 BD9151MUV Block Diagram
●Pin No. & function table
Pin
Pin
No. name
PIN Function
1 PGND2 Ch2 Low side source pin
Pin
Pin
No. name
11 AGND Ground
PIN Function
2 PGND2 Ch2 Low side source pin
12 AVCC Power supply input pin
3 PVCC2 Ch2 High side FET source pin
13
PGATEB
External Pch MOS Gate Drive pin
(Low Active)
4 PVCC1 Ch1 High side FET source pin
5 PGND1 Ch1 Low side source pin
14
PGATE
PGATEB reverse logic output signal
(High Active)
15 MONI 3.3V Output monitor pin
6
SW1 Ch1 Pch/Nch FET drain output pin
16
ITH2
Ch2 GmAmp output pin
/ Connected phase compensation capacitor
7
SW1 Ch1 Pch/Nch FET drain output pin
17 FB2 Ch2 output voltage detect pin
8
FB1 Ch1 output voltage detect pin
18
EN Enable pin (High Active)
9
ITH1
Ch1 GmAmp output pin
/Connected phase compensation capacitor
19
SW2 Ch2 Pch/Nch FET drain output pin
10 RESET RESET Output pin
20 SW2 Ch2 Pch/Nch FET drain output pin
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2009.08 - Rev.A