NPC SM8144BV Datasheet

SM8144B

NIPPON PRECISION CIRCUITS INC.

EL Sheet Driver

OVERVIEW

The SM8144B is a transformer-less electroluminescent (EL) driver IC, capable of driving displays up to 80

2

cm

in size. It is a high-efficiency driv er that features re vised coil switching transistor ON resistance and output

circuit configuration to reduce loss, all in a compact package.
A microcontroller interface pin (ENA) is provided, which can be used to control the EL driver ON/OFF func-

tion. The device is available in 8-pin VSOP packages.

FEATURES

■

Dedicated EL driver

■

1.6 to 5.5 V supply voltage

■

100mA maximum operating current
(V

= 3.0V, Ta ≤ 70 ° C)

DD

■

3.5 Ω typical output resistance

■

200 Vp-p maximum EL driver voltage*

■

31 to 1500 Hz EL drive frequency range*

■

High voltage CMOS Process

■

8-pin VSOP plastic package

*: Adjustable with external resistance.

PINOUT

(Top view)

OSC

1CHV
2LDR
3VSS

8144BV

4

8 OUT1
7 OUT2
6 VDD
5

ENA

APPLICATIONS

■

Hand held PC, Palm size PC

■

Mobile IT equipment

■

White EL

ORDERING INFORMATION

De vice Pack ag e

SM8144BV 8-pin VSOP

PACKAGE DIMENSIONS

(Unit : mm)

6.4 ± 0.3

4.4 ± 0.2

0.575 typ

3.1 ± 0.3

1.15 ± 0.05

0.65

0.10

0.1 ± 0.05

0.22 ± 0.1

0.12

0 to 10

0.5 ± 0.2

0.1

+

0.05

−

0.15

M

preliminary

NIPPON PRECISION CIRCUITS—1

BLOCK DIAGRAM

SM8144B

EL sheet

<

80cm

VDD CHVLDR OUT2OUT1

Switching Circuit

Boosting Block

2

Dividing Circuit

1/4

Oscillator for

Boosting and EL driving

VSS

When ENA is logical "H", SM8144B is active.

OSC

Oscillation Block

R

OSC

ENA from microcontroller

Dividing Circuit

1/1024

ENA

PIN DESCRIPTION

Pin number Name I / O Function

1 C H V I High-voltage DC input
2 LD R O Booster coil driver output
3 VS S – Ground
4 OSC I Coil and EL driver oscillator (oscillator frequency determined by external resistor)
5 ENA I Enable input (built-in pull-down resistor)
6 VD D – Supply
7 OUT2 O Output 2
8 OUT1 O Output 1

preliminary

NIPPON PRECISION CIRCUITS—2