Maxim's MAX1553/MAX1554 are small, high efficiency, step-up DC-to-DC converters for driving two to 10 white LEDs in series. They regulate with a constant current, providing efficient display backlighting in PDAs, cellphones, and other handheld devices. The step-up DC-to-DC converter includes an internal 40 V, low drain-source on-resistance, N-channel MOSFET switch for high efficiency and maximum battery life. The devices are available in a 3 x 3 mm, 8-pin TDFN package.
The MAX1553's current limit of 480 mA drives two to six white LEDs. At 20 mA from a 3,6 V input voltage, it drives six white LEDs with 88% efficiency. The MAX1554's current limit of 970 mA drives up to 10 white LEDs with 82% efficiency at 20 mA from a 3,6 V input voltage. The devices have an adjustable overvoltage protection circuit that stops the internal MOSFET from switching if the LED string open-circuits due to a fault and prevents the output from soaring.
A single dual mode input adjusts brightness through a PWM signal or a direct DC voltage. A separate enable input provides on/off control. Soft-start minimises inrush current during startup.
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