MAX1575 Overview
By utilizing adaptive 1x/1.5x chargepump modes and very-low-dropout current regulators, it achieves high efficiency over the full 1-cell lithiumbattery input voltage range. A 1MHz fixed-frequency switching allows for tiny external ponents, and the regulation scheme is optimized to ensure low EMI and low input ripple. The MAX1575 uses an external resistor to set the fullscale 100% LED current.
MAX1575 Key Features
- Powers Main and Sub-Display LEDs
- 85% Average Efficiency (PLED / PBATT) Over Li+ Battery Discharge
- 2% LED Current Matching
- Up to 30mA/LED Drive Capability
- Adaptive 1x/1.5x Mode Switchover
- Low Input Ripple and EMI
- Individual 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