BQ24232H Datasheet, PDF (2/37 Pages) Texas Instruments – USB-Friendly Lithium-Ion Battery Charger and Power-Path Management IC

bq24230H
bq24232H
SLUSBI8 – JANUARY 2014
www.ti.com
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
DESCRIPTION (CONTINUED)
The battery is charged in three phases: conditioning, constant current, and constant voltage. In all charge
phases, an internal control loop monitors the IC junction temperature and reduces the charge current if the
internal temperature threshold is exceeded.
The charger power stage and charge current sense functions are fully integrated. The charger function has high-
accuracy current and voltage regulation loops, charge status display, and charge termination. The input current
limit and charge current are programmable using external resistors.
TERMINAL CONFIGURATION AND FUNCTIONS
RGT PACKAGE
(Top View)
TS
BAT
BAT
CE
16 15 14 13
1
12
2
11
bq24230H
3
10
4
9
5 678
ILIM
OUT
OUT
CHG
TS
BAT
BAT
CE
16 15 14 13
1
12
2
11
bq24232H
3
10
4
9
5 678
ILIM
OUT
OUT
CHG
NAME
Terminal
NUMBER
'230H '232H
TS
1
1
BAT
2,3 2, 3
CE
4
4
EN2
5
5
EN1
6
6
PGOOD
7
7
VSS
CHG
8
8
9
9
OUT
10,11 10, 11
ILIM
12
12
IN
13
13
Terminal Functions
I/O
DESCRIPTION
External NTC Thermistor Input. Connect the TS input to the NTC thermistor in the battery pack. TS monitors a 10-kΩ
I NTC thermistor. For applications that do not utilize the TS function, connect a 10-kΩ fixed resistor from TS to VSS to
maintain a valid voltage level on TS.
I/O
Charger Power Stage Output and Battery Voltage Sense Input. Connect BAT to the positive terminal of the battery.
Bypass BAT to VSS with a 4.7-μF to 47-μF ceramic capacitor.
Charge Enable Active-Low Input. Connect CE to a high logic level to place the battery charger in standby mode. In
I
standby mode, OUT is active and battery supplement mode is still available. Connect CE to a low logic level to enable
the battery charger. CE is internally pulled down with ~285 kΩ. Do not leave CE unconnected to ensure proper
operation.
I Input Current Limit Configuration Inputs. Use EN1 and EN2 control the maximum input current and enable USB
compliance. See Table 2 for the description of the operation states. EN1 and EN2 are internally pulled down with ~285
I _{kΩ. Do not leave EN1 or EN2 unconnected to ensure proper operation.}
Open-drain Power Good Status Indication Output. PGOOD pulls to VSS when a valid input source is detected. PGOOD
O is high-impedance when the input power is not within specified limits. Connect PGOOD to the desired logic voltage rail
using a 1-kΩ – 100-kΩ resistor, or use with an LED for visual indication.
– Ground. Connect to the thermal pad and to the ground rail of the circuit.
O
Open-Drain Charging Status Indication Output. CHG pulls to VSS when the battery is charging. CHG is high impedance
when charging is complete and when charger is disabled.
System Supply Output. OUT provides a regulated output when the input is below the OVP threshold and above the
O regulation voltage. When the input is out of the operation range, OUT is connected to V_BAT. Connect OUT to the system
load. Bypass OUT to VSS with a 4.7-μF to 47-μF ceramic capacitor.
I
Adjustable Current Limit Programming Input. Connect a 3.1-kΩ to 7.8-kΩ resistor from ILIM to VSS to program the
maximum input current (EN2=1, EN1=0). The input current includes the system load and the battery charge current.
Input Power Connection. Connect IN to the connected to external DC supply (AC adapter or USB port). The input
I operating range is 4.35 V to 6.6 V. The input can accept voltages up to 26 V without damage but operation is
suspended. Connect bypass capacitor 1 μF to 10 μF to VSS.
2
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