Epson S1F70000 User Manual

S1F70000 Series

4–41

Technical Manual

S1F71200 is a step-up/step-down DC/DC converter
control IC for which the CMOS process is used and to
which a power transistor is connected outside.
S1F71200 is composed of an oscillator, a reference
voltage circuit, an error amplifier, a PWM circuit, a se-
ries regulator, a driver, etc.  When this IC drives an ex-
ternal power transistor, S1F71200 can constitute a step-
up/step-down DC/DC converter that operates as a [step-
down] series regulator when the input voltage is High
and that operates as a [step-up] switching regulator of
pulse width modulation system (PWM) when the input
voltage is Low.
S1F71200 is also provided with an overcurrent protec-
tion circuit and a soft start circuit.  When receiving ex-
ternal signals, S1F71200 can stop the oscillator and the
switching circuit and turn off the power, so that it can
reduce wasteful current consumption at the time of sys-
tem halt.

• Input voltage

: 2.5V to 12.0V

• Output voltage

: 5.0V (S1F71200M0A0)

3.3V (S1F71200M0B0)

• Power off current

: 1.0

µ

A

• Self current consumption : 150

µ

A

(step-up portion)
15

µ

A

(step-down portion)

• Frequency fixing (200kHz) PWM at step-up time
• Power off function (IC shutdown)
• Soft start function
• Overcurrent protection function
• Shipping pattern

: plastic package

(SSOP2-16 pin)

* Radiation-resistant design has not been provided for

this specification.