BQ24298_15 Datasheet, PDF (4/51 Pages) Texas Instruments – bq24298 I2C Controlled 3A Single Cell USB Charger With Narrow VDC Power Path Management and Adjustable Voltage USB OTG

bq24298
SLUSC59 – APRIL 2015
6 Pin Configuration and Functions
24-Pin WQFN
RTW Package
(Top View)
www.ti.com
24 23 22 21 20 19
VBUS 1
PSEL 2
PG 3
STAT 4
SCL 5
SDA 6
bq24298
18 PGND
17 PGND
16 SYS
15 SYS
14 BAT
13 BAT
7 8 9 10 11 12
PIN
NAME
VBUS
NUMBER
1,24
PSEL
2
PG
3
STAT
4
SCL
5
SDA
6
INT
7
OTG
8
CE
9
ILIM
10
TS
11
QON
12
Pin Functions
TYPE
DESCRIPTION
P Charger Input Voltage. The internal n-channel reverse block MOSFET (RBFET) is connected between VBUS and
PMID with VBUS on source. Place a 1-µF ceramic capacitor from VBUS to PGND and place it as close as possible
to IC.
I Power source selection input. High indicates a USB host source and Low indicates an adapter source.
O Open drain active low power good indicator. Connect to the pull up rail via 10-kΩ resistor. LOW indicates a good
input source if the input voltage is between UVLO and ACOV, above SLEEP mode threshold, and current limit is
above 30 mA.
O Open drain charge status output to indicate various charger operation. Connect to the pull up rail via 10-kΩ resistor.
LOW indicates charge in progress. HIGH indicates charge complete or charge disabled. When any fault condition
occurs, STAT pin in the charge blinks at 1 Hz.
I
I²C Interface clock. Connect SCL to the logic rail through a 10-kΩ resistor.
I/O I²C Interface data. Connect SDA to the logic rail through a 10-kΩ resistor.
O Open-drain Interrupt Output. Connect the INT to a logic rail via 10kΩ resistor. The INT pin sends active low, 256-µs
pulse to host to report charger device status and fault.
I
Digital
USB current limit selection pin during buck mode, and active high enable pin during boost mode.
For bq24298, when in buck mode with USB host (PSEL = High), when OTG = High, IIN limit = 500 mA and when
OTG = Low, IIN limit = 100 mA.
The boost mode is activated when the REG01[5] = 1 and OTG pin is High.
I Active low Charge Enable pin. Battery charging is enabled when REG01[5:4] = 01 and CE pin = Low. CE pin must
be pulled high or low.
I ILIM pin sets the maximum input current limit by regulating the ILIM voltage at 1 V. A resistor is connected from
ILIM pin to ground to set the maximum limit as I_INMAX = (1V/R_ILIM) × K_ILIM. The actual input current limit is the lower
one set by ILIM and by I²C REG00[2:0]. The minimum input current programmed on ILIM pin is 500 mA.
I Temperature qualification voltage input. Connect a negative temperature coefficient thermistor. Program
Analog ^{temperature window with a resistor divider from REGN to TS to GND. Charge suspends or Boost disable when TS}
pin is out of range. A 103AT-2 thermistor is recommended.
I BATFET enables control in shipping mode and BATFET reset function. Logic high to low transition on this pin with
at least t_{QON_ON_1} deglitch turns on BATFET to exit shipping mode. It has internal pull up to maintain default high
logic.
When VBUS is not plugged-in, a logic low of at least t_{QON_RST} will reset SYS power by turning BATFET off for
t_{BATFET_RST} and then re-enable BATFET after t_{BATFET_RST} duration. The pin integrates a pull-up resistor of typical 187
kΩ.
4
Submit Documentation Feedback
Product Folder Links: bq24298
Copyright © 2015, Texas Instruments Incorporated