BQ24170RGYR

Product Summary

The BQ24170RGYR is highly integrated stand-alone Li-ion and Li-polymer switch-mode battery charger with two integrated N-channel power MOSFETs. It offers a constant-frequency synchronous PWM controller with high accuracy regulation of input current, charge current, and voltage. The BQ24170RGYR closely monitors the battery pack temperature to allow charge only in a preset temperature window. It also provides battery detection, pre-conditioning, charge termination, and charge status monitoring. The thermal regulation loop reduces charge current to maintain the junction temperature of 120℃ during operation. The BQ24170RGYR charges the battery in three phases: precondictioning, constant current, and constant voltage. The BQ24170RGYR charges one, two, or three cells (selected by CELL pin), and the bq24172 is adjustable for up to three series Li+ cells. The BQ24170RGYR features Dynamic Power Management (DPM) to reduce the charge current when the input power limit is reached to avoid over-loading the adapter. A highly-accurate current-sense amplifier enables precise measurement of input current from adapter to monitor overall system power. The BQ24170RGYR is available in a 24-pin, 3.5mm × 5.5mm thin QFN package. Applications include Tablet PC, Netbook and Ultra-Mobile Computers, Portable Data Capture Terminals, Portable Printers, Medical Diagnostics Equipment, Battery Bay Chargers and Battery Back-Up Systems.

Parametrics

BQ24170RGYR absolute maximum ratings: (1)Voltage range-PVCC: –0.3 to 20V; (2)Voltage range-AVCC, ACP, ACN, ACDRV, CMSRC, STAT: –0.3 to 30V; (3)Voltage range-BTST: –0.3 to 26V; (4)Voltage range-BATDRV, SRP, SRN: –0.3 to 20V; (5)Voltage range-SW: –2 to 20V; (6)Voltage range-OVPSET, REGN, TS, TTC, CELL: –0.3 to 7V; (7)Voltage range-VREF, ISET, ACSET: –0.3 to 3.6V; (8)Voltage range-PGND: –0.3 to 0.3V; (9)Maximum difference voltage-SRP–SRN, ACP-ACN: –0.5 to 0.5V; (10)Junction temperature range: –40 to 155℃; (11)Storage temperature range: –55 to 155℃.

Features

BQ24170RGYR features: (1)1.6MHz Synchronous Switch-Mode Charger with 4A Integrated N-MOSFETs; (2)Up to 94% Efficiency; (3)30V Input Rating with Adjustable Over-Voltage Protection; (4)Battery Charge Voltage: 1, 2, or 3-Cell with 4.2V/Cell; (5)High Integration; (6)±0.5% Charge Voltage Regulation; (7)±4% Charge Current Regulation; (8)±4% Input Current Regulation; (9)Less than 15μA Battery Current with Adapter Removed; (10)Less than 1.5mA Input Current with Adapter Present and Charge Disabled; (11)Small QFN Package: 3.5mm × 5.5mm QFN-24 Pin.

Diagrams