BQ25306
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ZHCSMH4A –MARCH 2020 –REVISED NOVEMBER 2020
表7-1. Pin Functions (continued)
PIN
I/O(1)
DESCRIPTION
NAME
NO.
Battery voltage feedback input. Connect this pin to resistor divider’s middle point to program battery
charge voltage. When this pin is shorted to GND or open by fault, the converter stop switching and STAT
pin blinks. The resistor divider consists of a resistor R1 from battery positive terminal to FB pin and a
resistor R2 from FB pin to FB_GND. The recommended resistance value of R2 is 200kΩor lower. The
battery charge voltage is programmed as VBATREG = 1.1 (1 + R1/R2). The voltage regulation loop is
internally compensated and a 470pF feedforward capacitor is recommended to connect from battery to FB
pin.
FB
9
AI
Battery voltage feedback ground input. Connect the feedback resistor divider's low side resister to this pin.
The input of this pin is in high impedance when adaptor is unplugged or the charger is disabled by EN pin.
FB_GND
POL
8
5
AI
AI
EN pin polority selection. Keep this pin floating for standalone charger.
Device sisable input. With POL pin floating, the device is enabled with EN pin floating or pulled low, and
the device is disabled if EN pin is pulled high. With POL pin grounded, the device is enabled with EN pin
pulled high, and the device is disabled with EN pin pulled low or floating.
EN
6
AI
Ground reference for the device that is also the thermal pad used to conduct heat from the device. This
connection serves two purposes. The first purpose is to provide an electrical ground connection for the
device. The second purpose is to provide a low thermal-impedance path from the device die to the PCB.
This pad should be tied externally to a ground plane. Ground layer(s) are connected to thermal pad
through vias under thermal pad.
Thermal Pad
17
-
(1) AI = Analog input, AO = Analog Output, AIO = Analog input Output, DI = Digital input, DO = Digital Output, DIO = Digital input Output,
P = Power
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English Data Sheet: SLUSDC7
6
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