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Introduction

1.6 Control and Key Parameters Setting

Jumper Description

1-2: FET GATE = SYS: External PFET's gate tied to SYS and therefore disabled.

2-3: FET GATE = BGATE: External PFET's gate tied to BGATE pin and therefore

JP1 controlled by IC. 1-2 (FET GATE = BGATE)

It is recommended that this jumper be changed only when the device is not enabled or

in Hi-Z mode so that the PFET's gate is never left open.

1-2: CE = HI: Active-low charge enable high to disable charge and enter Hi-Z mode

JP2 2-3 (CE = LO)

2-3: CE = LO: Active-low charge enable low for normal operation

1-2: CD = HI: Active high chip disable high to disable charge and disable system

JP3 2-3 (CD = LO)

2-3: CD = LO: Active high chip disable low for normal operation

1-2 (TS = DIS): Connects TS high to DRV and disables the temperature sense function

on the IC

2 (JP4 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

JP4 2-3 (TS = SIM)

thermistor is used, R1 and R3 need to be resized.

2-3 (TS = SIM): Connects a potentiometer to the TS pin so the potentiometer can

emulate a thermistor. The potentiometer has been preset to approximately 3.4 kΩ so

that the TS voltage is 0.5 × V(DRV).

1.7 Recommended Operating Conditions

Min Typ Max Unit

Supply voltage, V

Operating input voltage from ac adapter 4.2 10 V

Battery voltage, V

BAT

Voltage applied at VBAT terminal 4.02 4.2 4.24 V

System voltage, V

SYS

Voltage output at SYS terminal (depends on VBAT voltage 3.4 4.37 V

and status of V

INDPM

)

Supply current, I

IN(MAX)

Maximum input current limit for ac adapter input (set by 1.5 2.5 A

user-selectable resistor)

Max fast charge current, Battery charge current 0.550 2.5 A

CHRG(MAX)

Operating junction temperature range, T

-40 125 °C

SLUU917–April 2012 QFN-Packaged bq24278 Evaluation Module

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