BQ25601 Datasheet, PDF (2/60 Pages) Texas Instruments – I2C Controlled 3-A, Single-Cell Battery Charger for High Input Voltage and Narrow Voltage DC (NVDC) Power Path Management

bq25601
SLUSCK5 – MARCH 2017
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Description (continued)......................................... 2
6 Pin Configuration and Functions ......................... 4
7 Specifications......................................................... 6
7.1 Absolute Maximum Ratings ...................................... 6
7.2 Recommended Operating Conditions....................... 6
7.3 Thermal information .................................................. 7
7.4 Electrical Characteristics........................................... 7
7.5 Timing Requirements .............................................. 12
7.6 Typical Characteristics ............................................ 13
8 Detailed Description ............................................ 15
8.1 Overview ................................................................. 15
8.2 Functional Block Diagram ....................................... 16
8.3 Feature Description................................................. 16
8.4 Device Functional Modes........................................ 17
8.5 Register Maps ......................................................... 33
9 Application and Implementation ........................ 44
9.1 Application information............................................ 44
9.2 Typical Application Diagram .................................. 45
9.3 Application Curves .................................................. 46
10 Power Supply Recommendations ..................... 50
11 Layout................................................................... 51
11.1 Layout Guidelines ................................................. 51
11.2 Layout Example .................................................... 51
12 Device and Documentation Support ................. 53
12.1 Community Resources.......................................... 53
12.2 Trademarks ........................................................... 53
12.3 Electrostatic Discharge Caution ............................ 53
12.4 Glossary ................................................................ 53
13 Mechanical, Packaging, and Orderable
Information ........................................................... 54
4 Revision History
DATE
March 2017
REVISION
*
NOTES
Initial release.
5 Description (continued)
The bq25601 is a 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 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. To support fast charging using high voltage adapter, the bq25601 provides
PSEL pin for USB switch control. To set the default input current limit, device 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 automatically detects 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 in
the constant voltage phase. When the full battery falls below the recharge threshold, the charger automatically
starts another charging cycle.
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