The MAX1582/MAX1582Y drive up to six white LEDs in
series with a constant current to provide display backlighting
for two (main and sub-) displays in cell phones
and other handheld devices. This configuration eliminates
the need for ballast resistors and expensive factory
calibration. The proprietary dual-output, step-up
pulse-width modulation (PWM) converter includes a low
RDSON n-channel MOSFET switch for high efficiency and
maximum battery life.
The MAX1582/MAX1582Y utilize 1MHz current-mode
PWM control to allow small input and output capacitors
and a small inductor, while minimizing ripple on the input
supply and avoiding interference to sensitive circuitry in
the equipment. Integrated overvoltage protection (27V
for the MAX1582 and 18V for the MAX1582Y) eliminates
the need for an external zener diode to protect the IC
from open circuit. Flexible dimming control utilizes either
an analog control signal or direct digital PWM control
without external RC filtering. This also increases dimming
accuracy at low brightness levels. The PWM dimming
signal can be any frequency from 200Hz to 200kHz. Softstart
eliminates inrush current during startup.
The MAX1582/MAX1582Y are available in tiny 4 x 4
chip-scale (UCSP™) and 12-pin thin QFN packages.
Key Features
Applications/Uses
Accurate Current Regulation for Uniform
Illumination
Lights Up Two LED Sections for Main and Subdisplays
Up to 84% Efficiency
Internal High-Power, 30V MOSFET
Low 15mVP-P Input Ripple
Flexible Dimming Control
Analog DAC Controlled
Direct-Digital PWM (No RC Required) from 200Hz to 200kHz
Overvoltage Protection to Eliminate Zener Diode
Constant 1MHz PWM Operation
Low-Profile Inductor and Capacitors
Soft-Start Eliminates Inrush Current
2.6V to 5.5V Input
0.01µA (typ) Shutdown Current
Tiny UCSP (2.1mm x 2.1mm x 0.61mm) and Thin
QFN (4mm x 4mm) Packages
Notes: **This pricing is BUDGETARY, for comparing similar parts. Prices are in
U.S. dollars and subject to change. Quantity pricing may vary
substantially and international prices may differ due to local
duties, taxes, fees, and exchange rates. For volume-specific prices
and delivery, please see the price and availability page
or contact an authorized distributor.
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