The MAX1583, a high-efficiency, step-up DC-DC converter that drives up to five white LEDs in series with a high constant current to provide camera flash/strobe power in cellphones, PDAs, and other handheld devices. This Maxim product in 10-pin TDFN package integrates a 1 MHz, 24 V, step-up DC-DC converter and a high-voltage, low-dropout current regulator. It operates from input voltages of 2,6 to 5,5 V.
Two logic inputs control four modes of operation: shutdown mode (0,5 μA); movie mode (programmable up to 100 mA); precharge mode for charging a reservoir capacitor up to 24 V while the LEDs are off; and strobe mode for firing the flash with a regulated current (programmable up to 300 mA) during an exposure. The MAX1583 also features overvoltage and thermal shutdown protection.
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