Microchip TC962 Handleiding

Microchip Niet gecategoriseerd TC962

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 2001-2012 Microchip Technology Inc. DS21484D-page 1

TC962

Features:

• Pin Compatible With TC7662/ICL7662/SI7661

• High Output Current 80 mA

• No External Diodes Required

• Wide Operating Range 3V to 18V

• Low Output Impedance 28 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

•P-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 80 mA

versus the 7662’s 20 mA 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 (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 12

kHz to 24 kHz. 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 5 mA) has a dynamic impedance of 12 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” 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

VDD

GND

COSC

TC962COE

Zener

Cathode

FREQ x 2

16-Pin SOIC Wide

C+

C–VOUT

FREQ x 2GND

TC962CPA

TC962EPA

TC962IJA

TC962MJA

C+

C–VOUT

8-Pin CERDIP

8-Pin DIP

•

Zener

Cathode

COSC

VDD

High Current Charge Pump DC-to-DC Converter

TC962

DS21484D-page 2  2001-2012 Microchip Technology Inc.

Functional Block Diagram

–

Comparator

with Hysteresis

F/F

REF

Level

Shift

Level

Shift

Level

Shift

Level

Shift

P SW1

CAP

External

N SW4

N SW2

N SW3

CAP

EXT

OUT

I I

OSC/C–

Timing

Zener

Cathode

FREQ x 2

GND

–

OUT

6.4V

TC962

 2001-2012 Microchip Technology Inc. DS21484D-page 3

TC962

1.0 ELECTRICAL

CHARACTERISTICS

Absolute Maximum Ratings*

Supply Voltage (VDD to GND) ..............................+18V

Input Voltage Any Pin

......................... (VDD +0.3) to (VSS -0.3) (Note 1)

Current Into Any Pin........................................... 10 mA

ESD Protection ................................................±2000V

Output Short Circuit ........... Continuous (at 5.5V Input)

Package Power Dissipation (T

A 70°C)

SOIC ....................................................... 760 mW

PDIP........................................................ 730 mW

CERDIP .................................................. 800 mW

Package Thermal Resistance

CERDIP, RJ-A .........................................90°C/W

PDIP, RJ-A ............................................ 140°C/W

Operating Temperature Range

CPA, COE ....................................... 0°C to +70°C

IJA................................................ -25°C to +85°C

EPA .............................................. -40°C to +85°C

MJA............................................ -55°C to +125°C

Storage Temperature Range .............-65°C to +150°C

*Stresses above those listed under “Absolute

Maximum Ratings” may cause permanent damage to

the device. These are stress ratings only and functional

operation of the device at these or any other conditions

above those indicated in the operation sections of the

specifications is not implied. Exposure to Absolute

Maximum Rating conditions for extended periods may

affect device reliability.

TC962 ELECTRICAL SPECIFICATIONS

Electrical Characteristics: VDD = 15V, TA = 25°C (See Figure ) unless otherwise noted.

Symbol Parameter Min Typ Max Units Test Conditions

VDD Supply Voltage 3 — 18 V

ISSupply Current

VDD = 15V

VDD = 5V

—

510

560

650

190

210

—

700

—

A RL = 

TA = +25°C

0 T  A 70°C

-55°C TA 125°C

TA = +25°C

0 T  A 70°C

-55°C TA 125°C

ROOutput Source

Resistance

—

IL = 20 mA, VDD = 15V

IL = 80 mA, VDD = 15V

IL = 3 mA, VDD = 5V

FOSC Oscillator Frequency —

—

kHz Pin 6 Open

Pin 6 GND

PEFF Power Efficiency 93

—

% RL = 2 k

VDEF Voltage Efficiency 99

—

99.9

—

% RL = 

Over temperature range

VZZener Voltage 6.0 6.2 6.4 V I Z = 5 mA

ZZT Zener Impedance — 12 — IL = 2.5 mA to 7.5 mA

Note 1: Connecting any input terminal to voltages greater than V + or less than GND may cause destructive latch-up. It is recommended that no

inputs from sources operating from external supplies be applied prior to “power-up” of the TC962.

Product specificaties

Merk:	Microchip
Categorie:	Niet gecategoriseerd
Model:	TC962

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