© 2001 IMP, Inc.

408-432-9100/www.impweb.com

1

IMP522

IMP522

Dual EL Lam

er

N Cellular phones

N PDAs/Handheld computers

N Toys/Consumer electronics

N Safety Illumination

N LCD modules

N Remote controls

N Drive two EL lamps independently

N Digital LMPSEL pin

— Activate either or both EL output drivers

30nF EL lamps

N Wide operating voltage range: 2V to 6.5V

N Low current consumption: 2mA maximum

N Disable mode extends battery life

— Disable current 2µA maximum

N Compact 10-pin MicroSO package

N High-voltage, low-cost CMOS process

Key Features

Applications

522_01.eps

Lamp

Drive

Oscillator

Three-Level Detector

Select

A Lamp

Select

B Lamp

Switch

Oscillator

Dual

Bridge

Driver

Regulation

Control

(9) LMPSEL

(6) GND

The IMP522 is a dual-output, high-voltage electroluminescent (EL) lamp

driver. Either or both EL lamp driver outputs can be turned ON with the

lamps. With an input supply voltage between 2.0V and 6.5V, the typical

regulated lamp drive voltage is 220V peak-to-peak.

The device uses a single inductor and a minimum number of passive

components: a storage capacitor, a fast recovery diode and two resistors

to set the PWM and EL drive frequencies. These can be independently

frequency for the internal 4.0

Ω switching MOSFET. The switch duty cycle

Designed to minimize battery current drain, the IMP522 draws 2mA maxi-

mum. A power-saving shutdown mode reduces current to 2µA maximum.

The IMP522 is available in a compact 10-pin MicroSO package and in die form.

Block Diagram