SP4438 datasheet(3/19 Pages) SIPEX

3 / 19 page

Rev.11/13/00

SP4438 Ultra-Quiet Electroluminescent Lamp Driver

PIN ASSIGNMENTS

Pin 1 — V

DD — Positive Battery Power Supply.

Connect such that +2.7V < V

DD < +3.3V.

Pin 2 — ELEN — Electroluminescent Lamp

Enable. When driven HIGH, this input pin

enables the EL driver outputs for EL1 and

EL2. This pin has an internal pulldown

resistor.

Pin 3 — R

OSC — Oscillator Resistor. Connect-

ing a resistor to this input pin sets the fre-

quency of the internal clock.

Pin 4 — V

SS — Power Supply Common. Con-

nect to the lowest circuit potential, typically

ground.

Pin 5 — COIL — The inductor for the EL lamp

is connected from V

DD to this input pin.

Pin 6 — C

INT — Integrating Capacitor.

integrating capacitor (47nF typical) con-

nected from this pin to ground filters out any

coil switching spikes or ripple present in the

output waveform to the EL lamp. Connect-

ing a fast recovery diode from COIL to C

INT

increases the light output of the EL lamp.

Pin 7 — EL2 — Electroluminescent Lamp Out-

put 2. This is a high voltage lamp driver

output pin to connect to the EL lamp.

Pin 8 — EL1 — Electroluminescent Lamp Out-

put 1. This is a high voltage lamp driver

output pin to connect to the EL lamp.

VDD

CINT

EL1

ELEN

ROSC

COIL

EL2

VSS

SP4438

PINOUT

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