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TELCOM SEMICONDUCTOR, INC.

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TC7660

CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER

FEATURES

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Converts +5V Logic Supply to

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Wide Input Voltage Range .................... 1.5V to 10V

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Efficient Voltage Conversion ......................... 99.9%

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Excellent Power Efficiency ............................... 98%

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Low Power Supply ............................... 80

IN

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Low Cost and Easy to Use

— Only Two External Capacitors Required

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RS232 Negative Power Supply

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Available in Small Outline (SO) Package

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Improved ESD Protection ....................... Up to 3kV

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No Dx Diode Required for High Voltage Operation

GENERAL DESCRIPTION

The TC7660 is a pin-compatible replacement for the

Industry standard TC7660 charge pump voltage converter.

It converts a +1.5V to +10V input to a corresponding – 1.5V

to – 10V output using only two low-cost capacitors, eliminat-

ing inductors and their associated cost, size and EMI.

The on-board oscillator operates at a nominal fre-

quency of 10kHz. Operation below 10kHz (for lower supply

current applications) is possible by connecting an external

capacitor from OSC to ground (with pin 1 open).

The TC7660 is available in both 8-pin DIP and 8-pin

SOIC packages in commercial and extended temperature

ranges.

ORDERING INFORMATION

Temperature

Part No.

Package

Range

TC7660COA

8-Pin SOIC

0

°C to +70°C

TC7660CPA

8-Pin Plastic DIP

0

°C to +70°C

TC7660EOA

8-Pin SOIC

– 40

°C to +85°C

TC7660EPA

8-Pin Plastic DIP

– 40

°C to +85°C

TC7660IJA

8-Pin CerDIP

– 40

°C to +85°C

TC7660MJA

8-Pin CerDIP

– 55

°C to +125°C

TC7660EV

Evaluation Kit for

Charge Pump Family

FUNCTIONAL BLOCK DIAGRAM

1

2

3

4

8

7

6

5

TC7660CPA

TC7660EPA

TC7660IJA

NC

CAP +

GND

CAP –

NC

CAP +

GND

CAP

–

VOUT

LOW

VOLTAGE (LV)

OSC

+

V

VOUT

LOW

VOLTAGE (LV)

OSC

+

V

NC = NO INTERNAL CONNECTION

1

2

3

4

8

7

6

5

TC7660COA

TC7660CPA

TC7660

GND

INTERNAL

VOLTAGE

REGULATOR

RC

OSCILLATOR

VOLTAGE–

LEVEL

TRANSLATOR

÷ 2

V + CAP +

82

7

6

OSC

LV

3

LOGIC

NETWORK

VOUT

5

CAP –

4

PIN CONFIGURATION (DIP and SOIC)

TC7660-7 9/30/96

EVALUATION

KIT

AVAILABLE