Datasheet

Introduction www.ti.com
1 Introduction
1.1 EVM Features
• Evaluation module for bq25050/bq25060 (HPA577 E2)
• 30-V input rating, with 10.5-V overvoltage protection (OVP)
• FET controller for external battery FET for external power path control (BGATE)
• Programmable charge current
• Input voltage dynamic power management
• 50-mA integrated low-dropout (LDO) linear regulator
• Battery NTC monitoring during charge and discharge
• Thermal regulation and protection.
• Status indication – Charging/Done and Temperature Faults
• Jumpers available. Easy-to-change connections.
1.2 General Description
The bq25050/60 is a highly integrated Li-Ion 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-ion battery with
up to 1 A of charge current. The 30-V input voltage range with input overvoltage protections supports
low-cost unregulated adapters.
The bq25050/60 has a single power output that charges the battery. The system load is connected to
OUT. The low-battery system startup circuitry maintains OUT greater than 3.4 V whenever an input source
is connected. This allows the system to start up and run whenever an input source is connected
regardless of the battery voltage. The charge current is programmable up to 1 A using the ISET input.
Additionally, a 4.9-V, 50-mA LDO is integrated into the integrated circuit (IC) for supplying low power
external circuitry.
The battery is charged in three phases: conditioning, constant current, and constant voltage. In all charge
phases, 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, charge
status display, and charge termination.
For details, see the bq25050 (SLUSA33) and bq25060 (SLUSA32) data sheets.
1.3 I/O Description
Table 1. I/O Description
Jack Description
J1–Vin USB or ac adapter positive output
J1–GND USB or ac adapter negative output
J2–OUT Connected to system load
J2–GND Ground
J3–BAT Connected to battery pack
J3–GND Ground
J3–GND Ground
J3–TS Temperature qualification voltage input
J4–VLDO LDO output
J4–GND Ground
J5 1-wire interface
JP1–Hi Charge-enable active-HIGH logic input.
JP1–Ctrl (EN) IC reference voltage VREF
JP1–Lo Ground
2
bq25050/bq25060EVM SLUU438–July 2010
Copyright © 2010, Texas Instruments Incorporated