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Pin Functions
Pin No.
Symbol
1
GND
2
VRMC
3
VREF
4
INM
5
RF
6
DTC
7
CRST
8
XRST
9
VBMON
10
VC
11
SPCKO
12
SPCKI
13
C2L
14
C1L
15
VB
16
C1H
17
C2H
18
VG
19
VCON
20
D0
21
D1
22
PWM1
23
SW
24
PGND
25
VBH
26
VB1
27
VB2
28
CLK
29
VBSEL
30
SLEEP
31
FFCLR
32
XWK4
33
XWK3
34
XWK2
35
XWK1
36
VSTB
I/O
I
GND pin of control block
O
SW output for remote commander
O
Connected to capacitor for reference voltage output pin filter.
I
Switching power supply control circuit error amplifier inverted input pin
O
Switching power supply control circuit error amplifier feedback resistor connection output pin
I
Switching power supply control circuit dead time control pin
I
Reset circuit reset signal delay capacitor connection pin
O
Reset circuit reset signal output pin. Monitors the VC voltage
O
VB1, VB2 switching monitor output pin
I
VC control voltage input pin
O
Clock driver output for external power supply
I
Clock driver input for external power supply
O
Capacitor connection pin for charge pump:(–) pole
O
Capacitor connection pin for charge pump:(–) pole
I
Power input pin for charge pump
O
Capacitor connection pin for charge pump:(+) pole
O
Capacitor connection pin for charge pump:(+) pole
O
Voltage output pin for charge pump. Connected to smoothing capacitor.
O
Switching power supply control driver start request output
O
Switching power supply control mode output
O
Switching power supply control mode output
O
Switching power supply control PWM output
O
Stepup converter driver pin
I
Driver output grounding pin
O
Outputs the higher voltage between the VB1 and VB2 inputs. Connected to smoothing capacitor
I
Pin connecting 1 cell (1.5V) batteries such as Ni-cd, Ni-MH batteries
I
Lithium ion battery connection pin
I
External clock input pin for sync control
I
Primary side power supply switching input pin
I
Sleep signal input pin
I
Input latch clear input pin for start signal
I
Start signal input pin
I
Start signal input pin
I
Start signal input pin
I
Start signal input pin
O
Operating power supply output pin. Outputs power supply voltage during operations
— 73 —
Function
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