BQ24250C_15 Datasheet, PDF (5/46 Pages) Texas Instruments – bq24250C 2A Single Input I2C, Standalone Switch-Mode Li-Ion Battery Charger with Power-Path Management

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PIN
NAME
ISET
bq24250C
YFF
D1
LDO
PGND
PMID
SCL
SDA
F4
A3, B3, C3, F3
D5
E2
F2
STAT
E3
SW
SYS
TS
A4, B4, C4
A2, B2, C2
F1
VDPM
E4
bq24250C
RGE
10
24
15–16
20
6
5
7
17–18
13–14
9
23
Pin Descriptions (continued)
bq24250C
SLUSBY7 – JULY 2014
I/O
DESCRIPTION
Charge Current Programming Input. Connect a resistor from ISET to GND to
I program the fast charge current. The charge current is programmable from
300mA to 2A.
O
LDO output. LDO is regulated to 4.9V and drives up to 50mA. Bypass LDO
with a 1μF ceramic Capacitor. LDO is enabled when V_UVLO < V_IN <18V.
Ground pin. Connect to the ground plane of the circuit.
I Connection between blocking FET and high-side FET.
I I²C Interface Clock. Connect SCL to the logic rail through a 10kΩ resistor.
I/O I²C Interface Data. Connect SDA to the logic rail through a 10kΩ resistor.
Status Output. STAT is an open-drain output that signals charging status and
fault interrupts. STAT pulls low during charging. STAT is high impedance when
charging is complete or the charger is disabled. When a fault occurs, a 256μs
O pulse is sent out as an interrupt for the host. STAT is enabled/disabled using
the EN_STAT bit in the control register. STAT will indicate recharge cycles.
Connect STAT to a logic rail using an LED for visual indication or through a
10kΩ resistor to communicate with the host processor.
O Inductor Connection. Connect to the switching side of the external inductor.
I
System Voltage Sense and SMPS output filter connection. Connect SYS to the
system output at the output bulk capacitors. Bypass SYS locally with >20μF.
Battery Pack NTC Monitor. Connect TS to the center tap of a resistor divider
I from LDO to GND. The NTC is connected from TS to GND. See the NTC
Monitor section for more details on operation and selecting the resistor values.
Input DPM Programming Input. Connect a resistor divider between IN and GND
with VDPM connected to the center tap to program the Input Voltage based
I
Dynamic Power Management threshold (V_{IN_DPM}). The input current is reduced
to maintain the supply voltage at V_{IN_DPM}. The reference for the regulator is
1.2V. Short pin to GND if external resistors are not desired—this sets a default
of 4.68V for the input DPM threshold (EN1=1,EN2=0).
7 Specifications
7.1 Absolute Maximum Ratings⁽¹⁾
over operating free-air temperature range (unless otherwise noted)
IN
SW
Pin Voltage (with respect
to GND)
BOOT
LDO,STAT, INT, CHG, EN1, EN2, CE, ILIM, ISET, VDPM, TS
SYS, BAT
BOOT relative to SW
Output Current
(Continuous)
IN
SYS, BAT
Output Sink Current
STAT, CHG
Operating free-air temperature
Junction temperature, T_J
Input Power
IN
MIN MAX UNIT
–0.3
20 V
–0.7
12 V
–0.3
20 V
–0.3
7V
–0.3
5V
–0.3
7V
2
A
4
5 mA
–40
85 °C
–40
125 °C
15 W
(1) Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions beyond those indicated under recommended operating
conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
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