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MAX1577Y：1.2A White LED Regulating Charge Pump for Camera Flashes and Movie Lights

Highest Current, 1.2A, Charge Pumps Enable Brightest WLED Flashes in Camera Phones, Even with Low-Battery Input Voltage

The MAX1577Y/MAX1577Z charge pumps drive white LEDs, including camera strobes, with regulated current up to 1.2A (guaranteed to 800mA). The very low openloop output resistance allows high flash brightness, even from a low battery input voltage. The adaptive 1x/2x regulating charge-pump operation provides high efficiency (up to 92%) while in movie mode or backlighting. Fast (1MHz) switching allows the use of tiny external components. The MAX1577Y/MAX1577Z use an external resistor to set the full-scale LED current. Two enable inputs (EN1 and EN2) provide simple on/off control and LED current of 20%, 33%, or 100% full scale. If there is less than 24mV across the external resistor, the output voltage is regulated. The MAX1577Z has fixed 5.1V output-voltage regulation, while the MAX1577Y has logic-controlled output voltage of 3.4V, 4.6V, or 5.1V for backlighting, keyboard, and RGB applications. The MAX1577Y/MAX1577Z are available in an 8-pin, 3mm x 3mm TDFN package (0.8mm max height).

Key Features Up to 1.2A Output Drive Capability (800mA Guaranteed) Up to 92% PLED / PBATT Efficiency for Movie Mode Flexible Brightness Control Two-Bit Logic for 100%, 33%, 20%, and Off PWM for 20% to 100% 3% Current Regulation Over Line and Temperature Current or Voltage Regulation for Flash and Backlighting (MAX1577Y) Current Regulation for Flash (MAX1577Z) Low Ripple and EMI 2.7V to 5.5V Supply Voltage Range Soft-Start Limits Inrush Current Output-Voltage Regulation Mode Thermal-Shutdown Protection 8-Pin 3mm x 3mm TDFN Package

MAX1577Y, MAX1577Z: Typical Operating Circuit Applications/Uses Camera Phones, Cell Phones, and Smartphones LCD Backlights PDAs, Digital Cameras, and Camcorders White LED Flashes, Strobes, and Movie Lights

DataSheet

Parametrics

Design kits & evaluation modules

• MAX1577ZEVKIT

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