Introduction
1.6
Control and Key Parameters Setting
Jumper
Description
Default Factory Setting
JP1
1-2 (FET GATE = SYS): External PFET's gate tied to SYS and therefore disabled.
2-3 (FET GATE = BGATE)
2-3 (FET GATE = BGATE): External PFET's gate tied to BGATE pin and therefore
controlled by IC.
JP2
1-2 (CD = HI): Charge disable high to disable charge and enter Hi-Z mode
2-3 (CD = LO)
2-3 (CD = LO): Charge disable low for normal operation
JP3
bq24271 only
1-2 (PSEL = HI)
1-2 (PSEL = HI): Indicates that a USB source is connected to the USB input and sets
the input current limit to 500 mA.
2-3 (PSEL = LO): Indicates that an ac adapter is connected to the USB input and sets
the USB input current limit to 1.5 A.
JP6
1-2 (TS = DIS): Connects TS high to DRV and disables the temperature sense
2-3 (TS = SIM)
functioning the IC
2 (JP6 Open): Connects the TS pin to an external thermistor. The resistor divider
formed by R1 and R3 has been sized to accommodate a 10-k
Ω
thermistor. If a different
thermistor is used, R1 and R3 must be resized.
2-3 (TS = SIM): Connects a potentiometer to the TS so that the potentiometer can
emulate a thermistor. The potentiometer has been preset to approximately 3.4 k
Ω
so
that the TS voltage is 0.5 x V (DRV).
JP7
bq24270 only
Shorted
Shorting jumper for USB data lines DM (D-) and DP (D+). When shorted, USB input
current limit defaults to 1.5 A. Otherwise, USB100 mode is selected.
1.7
Recommended Operating Conditions
Min
Typ
Max
Unit
USB voltage, V
USB
Input voltage from USB or equivalent supply
4.2
6
V
Battery voltage, V
BAT
Voltage applied at VBAT terminal of J8
0
3-4.2
4.44
V
Supply current, I
USB(MAX)
Maximum input current from USB or equivalent supply
0.1
1.5
A
Maximum fast charge
Battery charge current
0.550
1.5
A
current, I
chrg
Operating junction temperature range, T
J
0
125
°C
5
SLUU924 – April 2012
QFN-Packaged bq24270/271 Evaluation Modules
Copyright © 2012, Texas Instruments Incorporated
