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

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Overview

Up to 1.2A Output Drive Capability (800mA Guaranteed)
Up to 92% P_LED / P_BATT 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

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).

Applications

Camera Phones, Cell Phones, and Smartphones
LCD Backlights
PDAs, Digital Cameras, and Camcorders
White LED Flashes, Strobes, and Movie Lights

Documentation

Data Sheet 1

MAX1577-MAX1577Z: 1.2A White LED Regulating Charge Pump for Camera Flashes and Movie Lights Data Sheet (Rev.0) 11/09/2004

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
LED Drivers 6
MAX1576	PRODUCTION	480mA White LED 1x/1.5x/2x Charge Pump for Backlighting and Camera Flash
MAX1583		White LED Camera-Flash Boost Converter
MAX1573	PRODUCTION	White LED 1x/1.5x Charge Pump in UCSP and Thin QFN
MAX1574	PRODUCTION	180mA, 1x/2x, White LED Charge Pump in 3mm x 3mm TDFN

MAX8595	LAST TIME BUY	High-Efficiency, 36V Step-Up Converters with T_A Derating Option for 2 to 9 White LEDs
MAX8596	Obsolete	High-Efficiency, 36V Step-Up Converters with T_A Derating Option for 2 to 9 White LEDs

Evaluation Kits

Evaluation Kit for the MAX1577Y, MAX1577Z

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Features and Benefits

Selectable Flash/Movie Modes

Up to 92% Efficiency (P_LED / P_BATT)

3% LED Current Regulation

Adaptive 1x/2x Mode Switchover

2.7V to 5.5V Supply Voltage Range

8-Pin TDFN 3mm x 3mm IC Package

Fully Assembled and Tested

Product Details

The MAX1577Z evaluation kit (EV kit) is a fully assembled and tested circuit for evaluating the MAX1577Z white LED 1x/2x charge pump. The MAX1577Z EV kit strobes a white LED at up to 1.1A using an on-board pulse generator. In movie mode, it drives the LED at a constant 220mA. The current levels are adjusted by changing a resistor. The EV kit can also be used to evaluate the MAX1577Y.