BQ25606 Datasheet, PDF (3/43 Pages) Texas Instruments – Standalone 3.0-A, Single Cell Battery Charger With 40V Over Voltage Protection Controller

bq25606
www.ti.com
SLUSCK6 – MAY 2017
5 Description (continued)
The bq25606 is a highly-integrated standalone 3.0-A switch-mode battery charge management and system
power path management device for single cell Li-Ion and Li-polymer battery. It features fast charging with high
input voltage support for a wide range of standalone chargers and portable devices. Its low impedance power
path optimizes switch-mode operation efficiency, reduces battery charging time and extends battery life during
discharging phase. Its input voltage and current regulation deliver maximum charging power to battery. The
solution is highly integrated with input reverse-blocking FET (RBFET, Q1), high-side switching FET (HSFET, Q2),
low-side switching FET (LSFET, Q3), and battery FET (BATFET, Q4) between system and battery. It also
integrates the bootstrap diode for the high-side gate drive for simplified system design.
The device supports a wide range of input sources, including standard USB host port, USB charging port, and
USB compliant high voltage adapter. The device sets default input current limit based on the built-in USB
interface. The device is compliant with USB 2.0 and USB 3.0 power spec with input current and voltage
regulation. When the device built-in USB interface identifies the input adaptor is unknown, the device's input
current limit is determined by the ILIM pin setting resistor value. The device also meets USB On-the-Go (OTG)
operation power rating specification by supplying 5.15 V on VBUS with constant current limit up to 1.2-A.
The power path management regulates the system slightly above battery voltage but does not drop below 3.5 V
minimum system voltage. With this feature, the system maintains operation even when the battery is completely
depleted or removed. When the input current limit or voltage limit is reached, the power path management
automatically reduces the charge current to zero. As the system load continues to increase, the power path
discharges the battery until the system power requirement is met. This Supplement Mode prevents overloading
the input source.
The device initiates and completes a charging cycle without software control. It senses the battery voltage and
charges the battery in three phases: pre-conditioning, constant current and constant voltage. At the end of the
charging cycle, the charger automatically terminates when the charge current is below a preset limit and the
battery voltage is higher than recharge threshold. If the fully charged battery falls below the recharge threshold,
the charger automatically starts another charging cycle.
The charger provides various safety features for battery charging and system operations, including battery
negative temperature coefficient thermistor monitoring, charging safety timer and overvoltage and overcurrent
protections. The thermal regulation reduces charge current when the junction temperature exceeds 110°C. The
STAT output reports the charging status and any fault conditions.
The device family is available in 24-pin, 4 mm x 4 mm QFN package.
Copyright © 2017, Texas Instruments Incorporated
Product Folder Links: bq25606
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