bq25070 Datasheet | Texas Instruments

.ti. SLUSA66 - JULY 2011 1A, Single-Input, Single-Cell Li Fe PO4 Linear Battery Charger with 50m A LDO Check for Samples: bq25070 Features - Single Cell Li Fe PO4 Charging Algorithm - 30V Input Rating, With 10.5V Over-Voltage Protection (OVP) - 50m A Integrated Low Dropout Linear Regulator (LDO) - Programmable Charge Current Through Single Input Interface (CTRL) - 7% Charge Current Regulation Accuracy - Thermal Regulation and Protection - Soft-Start Feature to Reduce Inrush Current - Battery NTC Monitoring - Charging Status Indication - Available in Small 2mm × 3mm 10 Pin SON Package APPLICATIONS - Smart Phones - Mobile Phones - Portable Media Players - Low Power Handheld Devices DESCRIPTION The bq25070 is a highly integrated Li Fe PO4 linear battery charger targeted at space-limited portable applications. It operates from either a USB port or AC Adapter and charges a single-cell Li Fe PO4 battery with up to 1A of charge current. The 30V input voltage range with input over-voltage protections supports low-cost unregulated adapters. The bq25070 has a single power output that charges the battery and powers the system. The charge current is programmable up to 1A using the CTRL input. Additionally, a 4.9V ±10% 50m A LDO is integrated into the IC for supplying low power external circuitry. The Li Fe PO4 charging algorithm removes the constant voltage mode control usually present in Li-Ion battery charge cycles. Instead, the battery is fastcharged to the overcharge voltage and then allowed to relax to a lower float charge voltage threshold. The removal of the constant voltage control reduces charge time significantly. During the charge cycle, an internal control loop monitors the IC junction temperature and reduces the charge current if an internal temperature threshold is exceeded. The charger power stage and charge current sense functions are fully integrated. The charger function has high accuracy current and voltage regulation loops, and charge status...