BD9745EKN Datasheet, PDF (6/22 Pages) Rohm – Silicon Monolithic Integrated Circuit

○PIN DESCRIPTION
PIN No.
22
31
21
2
33
17-18,6-7,43
30
34
1
42
14,20,9,4
15-16,19,8,5,44
46,40
45,41
26,25,27,28,36,38
35
37
29
32
23,24,3
13,12,11,10,48,47,39
6/21
NAME
VBAT
VCC
PVCC
PVCC5
GND
PGND12,34,567
VREGA
VREF
OUT5
OUT7
Hx1,2,3,4
Lx1,2,3,4,6
HS6H, HS7H
HS6L, HS7L
INV1,2,3,4,6,7
NON5
INV7I
RT
SCP
UDSEL1,2,4
STB1,2,3,4,5,6,7
I/O
Description
NOTES
- Power supply for the start-up circuit Drive over 1.5V
- Power supply
Drive over 2.5V
- Power supply for Nch Driver
Drive over 2.5V
- Power supply for CH5 Pch Driver.
- Ground
- Power Ground for the Built-in FET.
O Output of REGA
Output
Voltage=2.5V
O Output of CH5 Reference.
Output
Voltage=1.0V
O
Connect to the Gate of CH5 external
Pch FET.
O
Connect to the Gate of CH7 external
Nch FET.
O Power supply for Built-in Pch FET.
O Connect to the inductor.
I Power supply for Built-in High side-SW.
O Output of Built-in High side-SW.
I Error AMP inverted input.
I Error AMP non-inverted input.
I Error AMP inverted input.
For Current Feed Back
Output Voltage=1.0V
-
A resistor is placed to set the OSC
frequency.
CLK frequency 1.2MHz
connecting 62kΩ to GND.
-
Connect to a capacitor to set up
the delay time of the SCP.
Charge up current
4μA until 1.0V.
I
Step-up/down switching mode
selection H: step-down L: step-up
I ON/OFF SW H: Operating Over 1.5V All Low; Stand-by
REV. D