BQ25600 Datasheet, PDF (3/66 Pages) Texas Instruments – I2C Controlled 3.0-A, Single Cell Battery Charger With up-to 40-V Overvoltage Protection Controller for High-Input Voltage and Narrow Voltage DC (NVDC) Power Path Management

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bq25600, bq25600D
SLUSCJ4 – JUNE 2017
4 Description (continued)
The bq25600 and bq25600D are highly-integrated 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 smart phones, tablets 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 and battery remote sensing 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 I²C serial interface with charging and system settings makes the device a truly flexible solution.
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. To set the default input current limit, the device uses the built-in USB interface, or takes the result from
detection circuit in the system, such as USB PHY device. The device is compliant with USB 2.0 and USB 3.0
power spec with input current and voltage regulation. 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 (programmable). 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
(programmable). The STAT output reports the charging status and any fault conditions. Other safety features
include battery temperature sensing for charge and boost mode, thermal regulation and thermal shutdown and
input UVLO and overvoltage protection. The VBUS_GD bit indicates if a good power source is present. The INT
output Immediately notifies host when fault occurs.
The device also provides QON pin for BATFET enable and reset control to exit low power ship mode or full
system reset function.
The device family is available in 30-ball, 2.0 mm × 2.4 mm WCSP package.
Copyright © 2017, Texas Instruments Incorporated
Product Folder Links: bq25600 bq25600D
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