TC7662B

TC7662B-8 9/11/96

EVALUATION

KIT

AVAILABLE

© 2001 Microchip Technology Inc.

DS21469A

CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER

FEATURES

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Wide Operating Voltage Range: 1.5V to 15V

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Boost Pin (Pin 1) for Higher Switching Frequency

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High Power Efficiency is 96%

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Easy to Use – Requires Only 2 External Non-Critical

Passive Components

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Improved Direct Replacement for Industry Stan-

dard ICL7660 and Other Second Source Devices

APPLICATIONS

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Simple Conversion of +5V to

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IN

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Negative Supplies for Data Acquisition Systems

and Instrumentation

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RS232 Power Supplies

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GENERAL DESCRIPTION

The TC7662B is a pin-compatible upgrade to the Indus-

try standard TC7660 charge pump voltage converter. It

converts a +1.5V to +15V input to a corresponding – 1.5 to

– 15V output using only two low-cost capacitors, eliminating

inductors and their associated cost, size and EMI.

The on-board oscillator operates at a nominal fre-

quency of 10kHz. Frequency is increased to 35kHz when

capacitors. Operation below 10kHz (for lower supply current

applications) is also possible by connecting an external

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

The TC7662B is available in both 8-pin DIP and 8-pin

small outline (SO) packages in commercial and extended

temperature ranges.

FUNCTIONAL BLOCK DIAGRAM

TC7662B

GND

INTERNAL

VOLTAGE

REGULATOR

RC

OSCILLATOR

VOLTAGE–

LEVEL

TRANSLATOR

÷ 2

V + CAP +

82

7

6

OSC

LV

3

LOGIC

NETWORK

VOUT

5

CAP –

4

1

BOOST

1

2

3

4

8

7

6

5

TC7662BCPA

TC7662BEPA

BOOST

CAP +

GND

CAP –

VOUT

LOW

VOLTAGE (LV)

OSC

+

V

1

2

3

4

8

7

6

5

TC7662BCOA

TC7662BEOA

BOOST

CAP +

GND

CAP –

VOUT

LOW

VOLTAGE (LV)

OSC

+

V

PIN CONFIGURATION (DIP AND SOIC)

ORDERING INFORMATION

Temperature

Part No.

Package

Range

TC7662BCOA

8-Pin SOIC

0

°C to +70°C

TC7662BCPA

8-Pin Plastic DIP

0

°C to +70°C

TC7662BEOA

8-Pin SOIC

– 40

°C to +85°C

TC7662BEPA

8-Pin Plastic DIP

– 40

°C to +85°C

TC7660EV

Evaluation Kit for

Charge Pump Family