S1F76600 Series

S1F76600 Series CMOS DC/DC Converter (Voltage Doubler)

DESCRIPTION

The S1F76600 Series is a highly efficient CMOS DC/ DC converter for doubling an input voltage (from –1.5V to –8V). This power-saving IC allows portable computers and similar hand-held equipment to operate from a single power supply, even when they incorporate LSIs that operate at voltages different from those of logic circuits, for example, LCD drivers and analog LSIs.

The S1F76600C0B0 is available in 8-pin plastic DIPs, and the S1F76600M0B0, in 8-pin plastic SOPs.

FEATURES

•95% (Typ.) conversion efficiency

•Two output voltages, VO, relative to VDD and VI

•30mA maximum output current at 5V

•Connecting-in-series configuration obtains a higher output voltage (V1=–5V, V0=–15V at two-in-series).

•Low operating voltage

•On-chip CR oscillator

•8-pin plastic DIP and 8-pin plastic SOP

APPLICATIONS

•Fixed-voltage power supplies for battery-operated equipment

•Power supplies for pagers, memory cards, calculators and similar hand-held equipment

•Fixed-voltage power supplies for medical equipment

•Fixed-voltage power supplies for communications equipment

•Uninterruptable power supplies

BLOCK DIAGRAM

VDD

OSC1 CR oscillator

OSC2

VI

CAP1+

Voltage converter CAP1–

VO

PIN ASSIGNMENTS

NC

1

 

8

VI

OSC2

2

S1F76600M0B0

7

VO

OSC1

3

6

CAP1–

/C0B0

VDD

4

 

5

CAP1+

S1F76600

Series

 

 

PIN DESCRIPTIONS

Pin No.

Pin name

Description

 

 

 

1

NC

No connection

 

 

 

2

OSC2

Resistor connection. Open when using external clock

 

 

 

3

OSC1

Resistor connection. Clock input when using external clock

 

 

 

4

VDD

Positive supply (system VCC)

 

 

 

5

CAP1+

Positive charge-pump connection

 

 

 

6

CAP1–

Negative charge-pump connection

 

 

 

7

VO

×2 multiplier output

 

 

 

8

VI

Negative supply (system ground)

 

 

 

S1F70000 Series Technical Manual

EPSON

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