© 2000 IMP, Inc.

408-432-9100/www.impweb.com

1

IMP560

IMP560

P

icient

EL Lam

er

N Night lights

N Automotive displays

N Cellular phones

N Pagers

N Clocks and radios

N Portable GPS receivers

N LCD module backlights

N 112V peak-to-peak typical AC output voltage

N Low input current (w/inductor current)......12mA

N Low disabled input current......50nA

N Wide operating voltage range - from 2.0V to 6.5V

N Simple design requires few passive components

N Adjustable output lamp frequency controls lamp

color and power consumption

N Adjustable converter frequency for minimum

power consumption

N IMP803 pin-compatible

N MicroSO package option

Block Diagram

–

+

560_01.eps

1

4

3

7

6

2

Switch

Oscillator

Regulation

Control

IMP560

Bridge Output

Driver and

OSC

Q

Q

Q

C

GND

5

8

Q

The IMP560 is an Electroluminescent (EL) lamp driver designed for sys-

tems with low EL lamp drive voltage requirements. It is ideal for low

ambient light applications or where small lamps are used. With just one-

half the inductor current of the IMP803, the IMP560 reduces system

power consumption and extends battery life. Input supply voltage range

is 2.0V to 6.5V and quiescent current is a low 420

µA. Typical EL lamp

drive voltage is ±56V.

All four EL lamp-driving functions are on-chip. These are the switch-

mode power supply, its high-frequency oscillator, the high-voltage

H-bridge lamp driver and its low-frequency oscillator. EL lamps of up to

6nF capacitance can be driven to high brightness.

The circuit requires few external components; a single inductor, a single

diode, two capacitors and three resistors. Two of these resistors set the

frequencies for two internal oscillators. An internal circuit shuts down

the switching regulator when the lamp drive voltage exceeds 120V

peak-to-peak. This conserves power and extends battery life.

A disable mode puts the chip into a low current drain mode. With a 3.0V

supply, quiescent current drops to 200nA maximum, 50nA typical. The

chip is disabled by connecting the oscillator frequency setting resistor

The IMP560 is available in MicroSO and SO-8 packages and in die or

wafer form.

Key Features

Applications