SP4491 Datasheet, PDF (1/13 Pages) Sipex Corporation – Two Panel Electroluminscent Lamp Driver

®
SP4491
Two Panel Electroluminscent Lamp Driver
s Single IC Drives 2 EL Lamps
For Backlighting:
• Cell Phone Keypad & LCD
• Multi-Color EL Lamps
• Multi-Segment EL Lamps
s Control Over Lamp-A & Lamp-B For
Independent Or Concurrent Operation
s +2.2V to +6.0V Battery Operation
s Single Coil Used To Generate High
Voltage AC Outputs
s Low Power Standby Mode Draws 100nA
Typical Current
s A Single Resistor Controls the Internal
Oscillator
s DC-AC Inverter Produces Up To 220V_PP
s Space-Saving 10MSOP Package
APPLICATIONS
s Cellular Phones
s PDA's
s Handheld GPS Units
s Security Systems
DESCRIPTION
s POS Terminals
The SP4491 electroluminescent lamp driver provides designers of cell phones PDA's and
other handheld, portable electronic devices with an integrated solution for driving two EL
lamps independently or concurrently. The SP4491 reduces system cost, component count
and board space requirements over a discrete 2-EL driver approach. The EL lamps operate
in opposite phase so the SP4491 can be easily implemented in applications driving multi-color
or multi-segment EL lamps. The SP4491 operates from a +2.2V to +6.0V battery source. The
device features a low power standby mode which draws less than 1µA. The frequency of the
internal oscillator is set using a single external resistor. A single external inductor is required
to generate the high voltage AC outputs to drive the EL lamps. All input pins are ESD protected
with internal diodes to V_DD and V_SS.
ELEN1 1
VDD 2
ROSC 3
ELEN2 4
VSS 5
SP4491
10 EL1
9 EL2
8 ELcommon
7 CAP
6 COIL
Rev. 12/19/00
SP4491 Two Panel Electroluminescent Lamp Driver
1
© Copyright 2000 Sipex Corporation