MAX1573 Datasheet PDF | Maxim Integrated

Maxim Integrated MAX1573

The MAX1573 fractional charge pump drives up to four white LEDs with regulated constant current for uniform intensity. By utilizing proprietary adaptive 1x/1.5x modes and ultra-low-dropout current regulators, it maintains the highest possible efficiency over the full 1-cell Li+ battery input voltage range. The 1MHz fixedfrequency switching allows for tiny external components and the regulation scheme is optimized to ensure low EMI and low input ripple.

Part No.	MAX1573
Datasheet	MAX1573 Download
Manufacturer	Maxim Integrated
Description	White LED 1x/1.5x Charge Pump
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GENERAL DESCRIPTION

An external resistor sets the full-scale LED current, while two digital inputs control on/off and select amongst three levels of brightness. A pulse-width modulation (PWM) signal can also be used to modulate LED brightness, requiring no additional components. The MAX1573 is available in the chip-scale package (UCSP™) (4 x 4 grid) to minimize PC board area. o Proprietary Adaptive 1x/1.5x Modes o High Efficiency (PLEDs/PBATT), Up to 92% o 2% LED Current Matching and Accuracy o 28mA/LED Drive Capability o Low Input Ripple and EMI o Eliminates Ballast Resistors o Logic or PWM Dimming Control o Low 0.1µA Shutdown Current o 2.7V to 5.5V Input Voltage Range o Soft-Start Limits Inrush Current o Output Overvoltage Protection o Thermal Shutdown Protection o No External Schottky Diode Required o Tiny 2.1mm x 2.1mm x 0.6mm UCSP Package

FEATURES

MAX1573

APPLICATIONS

Cell Phones, Smart Phones PDAs, Digital Cameras, Camcorders MP3 Players Other Handhelds with Color Displays PART M...