 2002 Microchip Technology Inc.

DS21484B-page 1

M

TC962

Features

• Pin Compatible With TC7662/ICL7662/SI7661

• High Output Current 80mA

• No External Diodes Required

• Wide Operating Range 3V to 18V

• Low Output Impedance 28

Ω Typ.

• No Low Voltage Terminal Required

• Application Zener On-Chip

• OSC Frequency Doubling Pin Option for Smaller

Output Capacitors

Applications

• Laptop Computers

• Disk Drives

• Process Instrumentation

•

µP-Based Controllers

Device Selection Table

General Description

The TC962 is an advanced version of the industry

standard TC7662 high voltage DC-to-DC converter.

Using

improved

design

techniques

and

CMOS

construction, the TC962 can source as much as 80mA

versus the 7662’s 20mA capability.

As an inverter, the TC962 can put out voltages as high

as 18V and as low as 3V without the need for external

diodes. The output impedance of the device is a low

28

Ω (with the proper capacitors), voltage conversion

efficiency is 99.9%, and power conversion efficiency is

97%.

The low voltage terminal (pin 6) required in some

TC7662 applications has been eliminated. Grounding

this terminal will double the oscillator frequency from

12kHz to 24kHz. This will allow the use of smaller

capacitors for the same output current and ripple, in

most applications. Only two external capacitors are

required for inverter applications. In the event an

external clock is needed to drive the TC962 (such as

paralleling), driving this pin directly will cause the

internal oscillator to sync to the external clock.

Pin 1, which is used as a test pin on the 7662, is a

voltage reference zener on the TC962. This zener

(6.4V at 5mA) has a dynamic impedance of 12

Ω and is

intended for use where the TC962 is supplying current

to external regulator circuitry and a reference is needed

for the regulator circuit. (See Section 3.0 Applications

Information).

The TC962 is compatible with the LTC1044, SI7661

and ICL7662. It should be used in designs that require

greater power and/or less input to output voltage drop.

It offers superior performance over the ICL7660S.

Package Type

Part

Number

Package

Operating

Temp.

Range

TC962COE

16-Pin SOIC Wide

0°C to +70°C

TC962CPA

8-Pin Plastic DIP

0°C to +70°C

TC962EPA

8-Pin Plastic DIP

-40°C to +85°C

TC962IJA

8-Pin CERDIP

-25°C to +85°C

TC962MJA

8-Pin CERDIP

-55°C to +125°C

1

2

3

4

8

7

6

5

FREQ x 2

GND

TC962CPA

TC962EPA

TC962IJA

TC962MJA

C+

C–

8-Pin CERDIP

8-Pin DIP

•

Zener

Cathode

1

2

3

4

5

6

7

8

16

13

12

11

10

9

NC

GND

NC

15

14

NC

NC

NC

TC962COE

NC

NC

Zener

Cathode

NC

FREQ x 2

16-Pin SOIC Wide

C+

C–

High Current Charge Pump DC-to-DC Converter