The MAX1553/MAX1554 drive white LEDs in series with
a constant current to provide efficient display backlighting
in cellular phones, PDAs, and other hand-held
devices. The step-up converter includes an internal
40V, low RDSON, N-channel MOSFET switch for high
efficiency and maximum battery life. The MAX1553 has
a current limit of 480mA for driving two to six white
LEDs, while the MAX1554 has a current limit of 970mA
for driving up to 10 white LEDs.
A single analog/PWM Dual Mode™ input provides two
simple means of brightness adjustment. A separate
enable input provides on/off control. Soft-start minimizes
inrush current during startup.
The MAX1553/MAX1554 are available in space-saving
8-pin TDFN 3mm x 3mm packages.
Key Features
Applications/Uses
Constant-Current Regulation for Even LED
Illumination
Internal 40V MOSFET Switch Capable of Driving
10 LEDs
Small, Low-Profile External Components
2.7V to 5.5V Input Range
Up to 88% Efficiency Driving 6 LEDs
Up to 82% Efficiency Driving 9 LEDs
(20mA, VCC = 3.6V)
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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