BQ24295 Datasheet, PDF (6/45 Pages) Texas Instruments – I2C Controlled 3A Single Cell USB Charger

bq24295
SLUSBC1 – SEPTEMBER 2013
PINOUTS
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24 23 22 21 20 19
VBUS 1
D+ 2
D– 3
STAT 4
SCL 5
SDA 6
bq24295
18 PGND
17 PGND
16 SYS
15 SYS
14 BAT
13 BAT
7 8 9 10 11 12
PIN
NAME
VBUS
D+
D–
STAT
SCL
SDA
INT
OTG
CE
ILIM
TS
QON
BAT
SYS
PGND
SW
PIN FUNCTIONS
NO.
1,24
2
3
4
5
6
7
8
9
10
11
12
13,14
15,16
17,18
19,20
TYPE
P
I
Analog
I
Analog
O
I
I/O
O
I
Digital
I
I
I
Analog
I
P
I
P
O
DESCRIPTION
Charger Input Voltage. The internal n-channel reverse block MOSFET (RBFET) is connected between VBUS and PMID
with VBUS on source. Place a 1µF ceramic capacitor from VBUS to PGND and place it as close as possible to IC.
Positive line of the USB data line pair. D+/D– based USB host/charging port detection. The detection includes data
contact detection (DCD) and primary detection in bc1.2.
Negative line of the USB data line pair. D+/D– based USB host/charging port detection. The detection includes data
contact detection (DCD) and primary detection in bc1.2.
Open drain charge status output to indicate various charger operation. Connect to the pull up rail via 10kohm. LOW
indicates charge in progress. HIGH indicates charge complete or charge disabled. When any fault condition occurs, STAT
pin in the charge blinks at 1Hz.
I²C Interface clock. Connect SCL to the logic rail through a 10kΩ resistor.
I²C Interface data. Connect SDA to the logic rail through a 10kΩ resistor.
Open-drain Interrupt Output. Connect the INT to a logic rail via 10kΩ resistor. The INT pin sends active low, 256us pulse
to host to report charger device status and fault.
OTG Enable pin. The boost mode is activated when the OTG pin is High, REG01[5], and no Input source is detected at
VBUS.
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.
ILIM pin sets the maximum input current limit by regulating the ILIM voltage at 1V. 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 500mA.
Temperature qualification voltage input #1. Connect a negative temperature coefficient thermistor. Program temperature
window with a resistor divider from REGN to TS1 to GND. Charge suspends or Boost disable disable when TS pin is out
of range. Recommend 103AT-2 thermistor.
BATFET enable control in shipping mode. A logic low to high transition on this pin with minimum 2ms high level turns on
BATFET to exit shipping mode. It has internal 1MΩ (typ.) pull down. For backward compatibility, when BATFET enable
control function is not used, the pin can be no connect or tied to TS pin. (Please refer to Shipping Mode for detail
description).
Battery connection point to the positive terminal of the battery pack. The internal BATFET is connected between BAT and
SYS. Connect a 10uF closely to the BAT pin.
System connection point. The internal BATFET is connected between BAT and SYS. When the battery falls below the
minimum system voltage, switch-mode converter keeps SYS above the minimum system voltage.
Power ground connection for high-current power converter node. Internally, PGND is connected to the source of the n-
channel LSFET. On PCB layout, connect directly to ground connection of input and output capacitors of the charger. A
single point connection is recommended between power PGND and the analog GND near the IC PGND pin.
Switching node connecting to output inductor. Internally SW is connected to the source of the n-channel HSFET and the
drain of the n-channel LSFET. Connect the 0.047µF bootstrap capacitor from SW to BTST.
6
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