SCI7660 View Datasheet(PDF) - Seiko Epson Corp

Part Name

Description

Manufacturer

SCI7660

DC-DC Converter

Seiko Epson Corp 

SCI7660 Series

DESCRIPTION

The SCI7660 Series is a highly efficient CMOS DC/DC

converter for doubling an input voltage. 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 volt-

ages different from those of logic circuits, for example,

LCD drivers and analog LSIs.

The SCI7660C0B is available in 8-pin plastic DIPs, and

the SCI7660M0B, in 8-pin plastic SOPs.

BLOCK DIAGRAM

VDD

OSC1

OSC2

VI

RC oscillator

FEATURES

• 95% (typ.) conversion efficiency

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

• 30mA maximum output current at 5V

• Two-in-series configuration doubles negative output

voltage.

• Low operating voltage

• On-chip RC oscillator

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

Voltage converter

PIN CONFIGURATION

CAP1+

CAP1–

VO

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

NC 1

8 VI

OSC2 2

7 VO

SCI7660C0B

OSC1 3

6 CAP1–

VDD 4

5 CAP1+

PIN DESCRIPTION

Number

1

2

3

4

5

6

7

8

Name

NC

OSC2

OSC1

VDD

CAP1+

CAP1–

VO

VI

Description

No connection

Resistor connection. Open when using external clock

Resistor connection. Clock input when using external clock

Positive supply (system VCC)

Positive charge-pump connection

Negative charge-pump connection

×2 multiplier output

Negative supply (system ground)

SCI7000 Series

Technical Manual

EPSON

1–1

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