SP4501 Datasheet, PDF (1/13 Pages) Sipex Corporation – EL Plus Piezo Driver

®
SP4501
EL Plus Piezo Driver
s Integrated EL Plus Piezo Driver For
Portable Electronic Devices
s Reduces System Cost, Size & Compo-
nent Count
s +2.2V to +6.0V Battery Operation
s A Single External Coil Drives Both the
EL Lamp and Piezotransducer Circuitry
s Piezotransducer Can Be Driven By an
External Clock or Internal Clock
s A Single Resistor Controls the Internal
Oscillator
s DC-to-AC Inverter Produces Up To
200V to Drive EL Lamps
P-P
s DC-to-AC Inverter Produces Waveform
to Drive Piezotransducer
s Low Current Standby Mode Draws Less
than 1µA
APPLICATIONS
s PDA's
s Pagers
s GPS
s Hand Held Medical Devices
DESCRIPTION
The SP4501 provides designers with both an electroluminescent lamp driver for backlighting and
a piezotransducer driver to generate audio alert tones. The integration of an EL lamp driver and
a piezotransducer driver in a single cost-effective IC reduces system cost, board space
requirements and component count. The SP4501 is ideal for portable applications such as
pagers, electronic games, PDAs, medical equipment, and designs with liquid crystal displays,
keypads, and backlit readouts. The SP4501 will operate from a +2.2V to +6.0V source. The
device features a low power standby mode which draws less than 1µA (typical). The frequency
of the internal oscillator is set with a single external resistor. The piezotranducer driver can be
driven with the internally generated clock signal or an external clock signal provided by the
designer. A single inductor is required to generate the high voltage AC used to drive the EL lamp
and the piezotransducer. All input pins are ESD protected with diodes to V_DD and V_SS.
ELEN 1
PZEN 2
ROSC 3
PZCK 4
PZCK 5
no connect 6
VSS 7
SP4501
14 VDD
13 EL2
12 EL1
11 PZ2
10 PZ1
9 CAP
8 COIL
11-14-00
SP4501 EL Plus Piezo Driver
1
© Copyright 2000 Sipex Corporation