IMP IMP522EMB Datasheet

© 2001 IMP, Inc. 408-432-9100/www.impweb.com 1

IMP522

IMP522

POWER MANAGEMENT ADVANCE PRODUCT INFORMATION

Dual EL Lam

Dual EL Lam

p Dr

p Driviverer

◆ Cellular phones

◆ PDAs/Handheld computers

◆ Toys/Consumer electronics

◆ Safety Illumination

◆ LCD modules

◆ Remote controls

◆ Drive two EL lamps independently

◆ Digital LMPSEL pin

— Activate either or both EL output drivers

◆ 220V

P-P

typical AC output voltage drives

30nF EL lamps

◆ Wide operating voltage range: 2V to 6.5V

◆ Low current consumption: 2mA maximum

◆ Disable mode extends battery life

— Disable current 2µA maximum

◆ Compact 10-pin MicroSO package

◆ 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

V

REF

(2) R

SW-OSC

LX (4)

C

S

(3)

V

A

(8)

V

AB

(7)

V

B

(5)

Dual

Bridge

Driver

V

DD

Regulation

Control

(1) V

DD

(9) LMPSEL

(10) R

EL-OSC

(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
LMPSEL select pin. One EL lamp is connected between V

A

and VABand

the other is connected between V

B

and VAB. VABis a common pin for both
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
set to optimize brightness and minimize power consumption. R

SW

is

connected between the R

SW-OSC

pin and the supply pin VDDto set the
frequency for the internal 4.0Ω switching MOSFET. The switch duty cycle
is 88%. The EL lamp driver frequency is set by R

EL

connected between the

R

EL-OSC

pin and the VDDpin.

Designed to minimize battery current drain, the IMP522 draws 2mA maxi­mum. 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

IMP522

IMP522

2 408-432-9100/www.impweb.com © 2001 IMP, Inc.

Parameter Symbol Conditions Min Typ Max Units

ON-resistance of MOS Switch R

DS(ON)

I = 100mA 4.0 8.0 Ω

Output Voltage Regulation V

CS

VDD= 2.0 to 6.5V, 110 120 V
T = –40°C to 85°C

Output Voltage Peak-to-Peak (in regulation) VA-V

AB, VB-VAB

In Regulation 220 V

Input Current at VDDPin I

DD

LMPSEL = GND 650 µA

Powerdown Input Current I

DDQ

V

RSW–OSC

< 100mA 2 µA

V

DD

= 2.0 to 6.5

T = –40°C to 85°C

Input Crrent Plus Inductor Current I

IN

See Figure 1 30 mA
LMPSEL = GND or V

DD

LMPSEL = floating 43 mA

Output Drive Frequency f

EL

See Figure 1 250 Hz

Switching Frequency f

SW

See Figure 1 61 kHz

Switching Duty Cycle D

SW

See Figure 1 88 %

LMPSEL Low-Level Threshold V

IL

0.3 V

DD

V

LMPSEL High-Level Threshold V

IH

0.7 V

DD

V

LMPSEL Input Resistance R

LMPSEL

50 kΩ

LMPSEL Sink/Source Resistance I

LMPSEL

Floating/Hign Impedance State ± 5µA

LMPSEL Hysteresis V

hys

50 mV

4L

X

3C

S

2R

SW-OSC

1V

DD

7

LMPSEL

5V

B

6 GND

8

V

AB

9

V

A

10 R

EL-OSC

522_02.eps

IMP522

MicroSO

Part Number Input Voltage Temperature Range Pins- Package

IMP522EMB 2.0V to 6.5V –40°C to +85°C 10-MicroSO

VDD, R

SW-OSC

and R

EL-OSC

. . . . . . . . . . . . . . . . . –0.5V to +7.0V

C

S

, LX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5V to +120V

Operating Temperature Range . . . . . . . . . . . . –40°C to +85°C

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

Power Dissipation (MicroSO) . . . . . . . . . . . . . 500mW

V

A

, V

B, VAB

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5V to VCS(pin 3)

Unless otherwise noted, VDD= 3.0V, RSW= 910kΩ, REL= 2.7MΩ, L = 220µH and TA= 25°C.

Note: All voltages are referenced to GND.

These are stress ratings only and functional operation is not
implied. Exposure to absolute maximum ratings for prolonged
time periods may affect device reliability.

Add /T to ordering part number for Tape and Reel.

Ordering Information

Pin Configuration

Absolute Maximum Ratings

Electrical Characteristics