MAX1574 Overview
By utilizing adaptive 1x/2x charge-pump modes and very-low-dropout current regulators, it achieves 180mA output drive capability and high efficiency over the 1-cell lithium-battery input voltage range. Fixed-frequency (1MHz) switching allows for tiny external ponents, and the regulation scheme is optimized to ensure low EMI and low input ripple. The MAX1574 uses an external resistor to set the fullscale 100% LED...
MAX1574 Key Features
- Up to 180mA (60mA/LED) Drive Capability
- 83% Average Efficiency (PLED / PBATT) Over Li+ Battery Discharge
- 0.5% (typ) LED Current Matching
- Adaptive 1x/2x Mode Switchover
- Low Input Ripple and EMI
- 5% to 100% Dimming Through Single-Wire Serial Pulse Interface
- Low 0.1µA Shutdown Current
- 2.7V to 5.5V Supply Voltage Range
- Soft-Start Limits Inrush Current
- Output Overvoltage Protection