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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-kΩ 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 kΩ 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

0 125 °C

SLUU924–April 2012 QFN-Packaged bq24270/271 Evaluation Modules

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