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7. PIN DESCRIPTION
7.1 Pin Functions
• Functional pins
Pin Name
I/O
ONOFSW
I
PSW
I
BSEL
I
FB
I
CBDLY
O
CUDLY
O
CSFT
O
CDET
O
UDET
O
BDET
O
OC1
O
OC2
O
OU1
O
OU2
O
OB1
O
OB2
O
• Power Supply Pin
Pin Name
I/O
V
I
CC
V
I
BUS
V
I
BAT
V
I
OUT
V
I
SS
V
O
DD
• Test pin
Pin Name
I/O
TM3
I
IQ
I
S1F76980 Technical Manual (Rev.1.0)
Pin
No.
2
Power switching operation select pin. H: ON-ON switching, L: OFF-OFF switching
15
V
power supply switch pin H: OFF, L: ON (normally fixed at LOW)
BAT
4
Used to set the priority sequence of V
Feedback input pin.
If measures against overvoltage are taken after output stage, feed back voltage at
13
an appropriate voltage dividing ratio.
If it is not necessary to take measures against overvoltage, pull down.
Pin used to connect the V
16
capacitor
Pin used to connect the V
20
capacitor
23
Pin used to connect the soft start time setting capacitor
Output pin used to monitor the V
24
On Nch open drain output L: Input enabled, Hi-Z: Input disabled
Output pin used to monitor the V
21
On Nch open drain output L: Input enabled, Hi-Z: Input disabled
Output pin used to monitor the V
18
On Nch open drain output L: Input enabled, Hi-Z: Input disabled
V
(adapter) power supply input-side control pin. L: Switch ON, H: Switch OFF
CC
6
To take measures against overvoltage, operate an external MOS transistor as a
regulator.
7
V
(adapter) power supply output-side control pin. L: Switch ON, H: Switch OFF
CC
V
(USB) power supply input-side control pin. L: Switch ON, H: Switch OFF
BUS
9
To take measures against overvoltage, operate an external MOS transistor as a
regulator.
10
V
(USB) power supply output-side control pin. L: Switch ON, H: Switch OFF
BUS
V
(battery) power supply input-side control pin. L: Switch ON, H: Switch OFF
BAT
12
To take measures against overvoltage, operate an external MOS transistor as a
regulator.
11
V
(battery) power supply output-side control pin. L: Switch ON, H: Switch OFF
BAT
Pin
No.
1
V
(adapter) power supply input-side pin.
CC
22
V
(USB) power supply input-side pin.
BUS
14
V
(battery) power supply input-side pin.
BAT
5
3-system select power supply output-side pin.
8
GND pin.
3
Pin used to connect the smoothing capacitor in the IC.
Pin
No.
Normally fixed to LOW.
19
Normally fixed to LOW.
17
Function
and V
BUS
-system low voltage detection dead time setting
BAT
-system low voltage release delay time setting
BUS
(adapter) power supply input voltage.
CC
(USB) power supply input voltage.
BUS
(battery) power supply input voltage.
BAT
Function
Function
EPSON
7. PIN DESCRIPTION
. H:V
, L:V
BAT
BUS
BAT
5
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