DESCRIPTION

· The bq24157 is a compact, high-efficiency switch-mode charge management device for single-cell Li-ion and Li-polymer batteries.
· It integrates a synchronous PWM controller, power MOSFETs, input current sensing, and high-accuracy current and voltage regulation.
· The device supports programmable charge parameters via an I2C interface and comes in a small WCSP package.

FEATURES

· Power up system without battery.
· High-accuracy voltage and current regulation (±5% input current, ±0.5% charge voltage at 25°C).
· Input voltage-based dynamic power management (VIN DPM).
· Bad adapter detection and rejection.
· Safety limit register for maximum charge voltage and current limiting.
· Supports up to 1.55A charge current with a 55mΩ sensing resistor.
· Synchronous fixed-frequency PWM controller operating at 3MHz.
· Robust protection features including reverse leakage, thermal regulation, and input/output overvoltage protection.
· Boost mode operation for USB OTG with an input voltage range of 3.2V to 4.5V.

APPLICATIONS

· Mobile and smart phones.
· MP3 players.
· Handheld devices.