4-37

TELCOM SEMICONDUCTOR, INC.

7

6

5

4

3

1

2

8

HIGH CURRENT CHARGE PUMP DC-TO-DC CONVERTER

TC962

PIN CONFIGURATIONS (DIP and SOIC)

+

1

2

3

4

8

7

6

5

FREQ x 2

V

ZENER

CATHODE

GND

TC962CPA

TC962EPA

TC962IJA

TC962MJA

1

2

3

4

5

6

7

8

16

13

12

11

10

9

NC

GND

COSC

NC

15

14

NC

NC

NC

TC962COE

NC

NC

C

–

C

DD

COSC

VOUT

ZENER

CATHODE

NC

+

C

–

C

VDD

FREQ x 2

VOUT

8-Pin CerDIP

8-Pin DIP

16-Pin SOIC Wide

•

+

–

COMPARATOR

WITH HYSTERESIS

C

F/F

Q

Q

VREF

LEVEL

SHIFT

LEVEL

SHIFT

LEVEL

SHIFT

LEVEL

SHIFT

VDD

P SW1

CAP

CP

EXTERNAL

N SW4

N SW2

N SW3

CAP

CR

EXT

RL

V

I

I

OSC/C

–

TIMING

ZENER

CATHODE

FREQ X 2

+

GND

–

OUT

8

2

3

OUT

5

4

7

1

6.4V

6

+

+

TC962

FEATURES

s

Pin Compatible With TC7662/ICL7662/SI7661

s

High Output Current ....................................... 80mA

s

No External Diodes Required

s

Wide Operating Range ............................. 3V to 18V

s

Low Output Impedance ............................. 28

Ω Typ.

s

No Low Voltage Terminal Required

s

Application Zener On Chip

s

OSC Frequency Doubling Pin Option for Smaller

Output Capacitors

ORDERING INFORMATION

Part No.

Package

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

TC7660EV

Evaluation Kit for Charge Pump Family

GENERAL DESCRIPTION

The TC962 is an advanced version of the industry-

standard 7662 high-voltage DC-to-DC converter. Using

improved design techniques and CMOS construction, the

TC962 can source as much as 8mA 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 7662

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.

FUNCTIONAL BLOCK DIAGRAM

EVALUATION

KIT

AVAILABLE

TC962-8 9/16/96