s1f78520 Epson Electronics America, Inc., s1f78520 Datasheet - Page 5

• Manufacturer Part Number: s1f78520
• Description: Charge-pump Step Down Regulator With Power Saving Mode
• Manufacturer: Epson Electronics America, Inc.

Rev. 1.2
Pin name
VO1LV1
VO1LV0
VO2LV1
VO2LV0
PIN DESCRIPTION
ROSC1
VSENS
XPOFF
XVDET
XSTBY
(1) Function pins
VSEL
CPG
C1P
C1N
C2P
C2N
PG
I/O
O
O
O
O
O
O
O
I
I
I
I
I
I
I
I
I
Pin No.
23
22
12
14
16
20
21
13
1
4
2
3
9
8
5
7
V
V
Pin to connect the external resistor for adjustment of the oscillating current.
This is the standby pin. Under the standby mode (light load), the internal structure
of the IC can be operated by low current consumption when this signal is set to the
V
Detecting voltage inputting pin for the low voltage detection circuit. This is effec-
tive only when the eternal setting is being selected.
Detecting voltage selecting pin for the low voltage detection circuit.
The detecting voltage inputting pin VSENS becomes valid when this pin is set to
the V
when this pin is set to the V
This is the shut down pin. Set this pin to the V
Operations of all the circuits will be interrupted when this signal is set to the V
level, bringing the IC into the shut down state and making the output pins XVDET,
PG to open state.
Delay time setting pin for the power good signals.
Positive side connection pin for the flying capacitor C1 for generation of the V
output voltage.
Negative side connection pin for the flying capacitor C1 for generation of the V
output voltage.
Positive side connection pin for the flying capacitor C2 for generation of the V
output voltage.
Negative side connection pin for the flying capacitor C2 for generation of the V
output voltage.
This is the detection result output pin for the low voltage detection circuit. The
output state is Nch open drain.
It outputs the V
This is the power good signal pin for the output power pins V
The output state is Nch open drain.
It goes open when both of the above output power pins are satisfying the speci-
fied voltage.
OUT1
OUT2
SS
V
V
V
V
V
V
V
V
VO1LV1
VO2LV1
*
SS
SS
DD
DD
SS
SS
DD
DD
SS
level.
*
*
*
*
*
*
*
*
Output voltage level designating pin.
Output voltage level designating pin.
*
Pin setting
Pin setting
level V
level V
level V
level V
level V
level V
level V
level V
level. The detection voltage generated inside the IC becomes valid
SS
VO1LV0
VO2LV0
DD
DD
DD
DD
SS
SS
SS
SS
*
*
*
*
*
*
*
*
*
level when the input power pin V
level
level
level
level
level
level Not for use
level
level Not for use
DD
voltage
voltage
*
Output
Output
3.3V
2.9V
2.5V
2.5V
2.0V
1.8V
level.
Function
DD
*
level while the IC is in operation.
DD
is at the low voltage level.
OUT1
S1F78520
and V
OUT2
OUT2
OUT2
OUT2
OUT2
.
SS
*
5