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 a battery and charge faster than linear chargers.

· High-accuracy voltage and current regulation with input current regulation accuracy of ±5%.

· Input Voltage Based Dynamic Power Management (VIN DPM) and bad adaptor detection.

· Safety limit register for maximum charge voltage and current limiting.

· Integrated Power FETs for up to 1.55-A charge rate and synchronous fixed-frequency PWM controller operating at 3 MHz.

· Robust protection features including reverse leakage protection, thermal regulation, and input/output overvoltage protection.

· Status output for charging and faults, and USB-friendly boot-up sequence.

· Boost mode operation for USB OTG with an input voltage range from 3.2V to 4.5V.

APPLICATIONS

· Mobile and smart phones.

· MP3 players.

· Handheld devices.