S1F76540MOC Epson Electronics America, Inc., S1F76540MOC Datasheet - Page 12

• Manufacturer Part Number: S1F76540MOC
• Description: Charge Pump Type Dc/dc Converter
• Manufacturer: Epson Electronics America, Inc.

5.5 Power-off Control Circuit
in Table 5.3 from the external system (microprocessor, etc.) to the POFF1X and POFF2X pins.
power-on and -off can be controlled using only one POFF1X pin.
power-on. Turning the power on or off before the power is not stabilized will result in a permanent destruction
of this IC.
S1F76540M0C Series Technical Manual (Rev.1.0)
Mode name
S1F76540 provides the power-off function, which turns each function on and off by issuing the signals shown
Using the power-off function, reactive current can be reduced in the application circuit connected in parallel.
When using the power-off function only in two states (all ON and all OFF), connect the POFF2X pin to VI;
[Notes on using the power-off function]
Before starting the power-off function with an external system signal, check that VI has been stabilized after
PS1
PS2
PS3
PS4
(Note 1) When the booster is off, the voltage of approximately VI+0.6V is generated in the VO
(Note 2) When the regulator is off, the V
POFF1X
(H=V
POFF1X
POFF2X
(L=V
H
H
L
L
DD
IN
pin.
VI
)
)
POFF2X
(H=V
(L=V
Table 5.3 Combination of power-on and -off modes
H
H
L
L
DD
IN
)
)
Fig.5.4 Power-off control start timing
Oscillation
circuit
OFF
OFF
ON
ON
Booster
(Note 1)
REG
EPSON
OFF
ON
ON
ON
pin is placed into the high impedance state.
POFF1X
POFF2X
Regulator
Function state
VI
(Note 2)
(Note 2)
OFF
OFF
ON
ON
5. FUNCTIONAL DESCRIPTION
All circuit ON state
All circuit OFF state
(Booster + Regulator)
Master side in parallel connection
(Booster only)
Slave side in parallel connection
Use
9