Texas Instruments bq24720 EVM, User Manual, Page: 3 / 34

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1.4 Controls and Key Parameters Setting
1.5 Recommended Operating Conditions
Introduction
Jack Description
J5–REF IC reference voltage VREF5 (pin 11)
J5–VPUP Pull-up voltage source
J5–EXT External power supply
J6–CHGEN CHGEN pin (1) output
J6–GND Ground
J7–VPUP Pull-up voltage source
J7–LEDPWR LED Pull-up power line
J8–ACGD/TS ACGOOD pin (15) output for bq24720, TS pin (15) output for bq24721
J8–GND Ground
J8–VBAT Connected to battery pack
J8–VSYS Connected to system
J9–BYPASS BYPASS pin (6) output
J9–LED LED drive
J10–ACDRV ACDRV pin (2) output
J10–LED LED drive
J11–BATDRV BATDRV pin (24) output
J11–LED LED drive
J12–ACGD ACGOOD pin (15) output
J12–LED LED drive
Jack or Resistor Description Factory Setting
Pull-up power source setting
1-2 (pin 1 and 2
J5 1-2: Use external power supply as the pull-up source
are short-circuited)
2-3: Use REF5 as the pull-up source
J6 Enable charge process when ON. Off
The pull-up power source supplies the LEDs when ON. LED has no power source when
J7 On
OFF.
J9 The conduction of the bypass MOSFET is indicated by D8 when ON. On
J10 The conduction of the AC MOSFET is indicated by D10 when ON. On
J11 The conduction of the battery MOSFET is indicated by D11 when ON. On
SYMBOL DESCRIPTION MIN TYP MAX UNIT
V
I
Supply voltage Input voltage from ac adapter input 13 19.5 24 V
V
(BAT)
Battery voltage Voltage applied at VBAT terminal of J8 9–16.8 20 V
I
O
Supply current Maximum input current from ac adapter input 5 7 A
I
(chrg)
Charge current Battery charge current 2 4 7 A
T
J
Operating junction temperature range 0 125
°
C
SLUU237 – January 2006 bq24720/21 EVM (HPA104) for Multi-Cell Synchronous 3
Switch-Mode Charger With System Power Selector and SMBus SBS-Like Interface