BQ24232H_15 Datasheet, PDF (4/42 Pages) Texas Instruments – bq2423xx USB-Friendly Lithium-Ion Battery Charger and Power-Path Management IC

bq24230H, bq24232H
SLUSBI8A – JANUARY 2014 – REVISED DECEMBER 2014
www.ti.com
NAME
EN1
EN2
ILIM
IN
ISET
ITERM
OUT
PGOOD
TD
Thermal
Pad
TMR
TS
VSS
PIN
NUMBER
'230H '232H
6
6
5
5
12
12
13
13
16
16
-
15
10,11 10, 11
7
7
15
-
14
14
1
1
8
8
Pin Functions (continued)
I/O
DESCRIPTION
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
I _{approximately 285 kΩ. Do not leave EN1 or EN2 unconnected to ensure proper operation.}
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.
Fast-Charge Current Programming Input. Connect a 3-kΩ to 36-kΩ resistor from ISET to VSS to program the fast-charge
I/O current level. Charging is disabled if ISET is left unconnected. While charging, the voltage at ISET reflects the actual
charging current and can be used to monitor charge current. See the Charge Current Translator section for more details.
I
Termination Current Programming Input. Connect a 0-Ω to 15-kΩ resistor from ITERM to VSS to program the termination
current. Leave ITERM unconnected to set the termination current to the internal default 10% threshold.
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.
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 to 100-kΩ resistor, or use with an LED for visual indication.
Termination Dsable Input. Connect TD high to disable charger termination. Connect TD to VSS to enable charger
I
termination. TD is checked during start-up only and cannot be changed during operation. See the TD section in this data
sheet for a description of the behavior when termination is disabled. TD is internally pulled down to VSS with
approximately 285 kΩ. Do not leave TD unconnected to ensure proper operation.
An internal electrical connection exists between the exposed thermal pad and the VSS pin of the device. The thermal
– pad must be connected to the same potential as the VSS pin on the printed-circuit board. Do not use the thermal pad as
the primary ground input for the device. The VSS pin must be connected to ground at all times.
Timer Programming Input. TMR controls the precharge and fast-charge safety timers. Connect TMR to VSS to disable all
I safety timers. Connect a 18-kΩ to 72-kΩ resistor between TMR and VSS to program the timers a desired length. Leave
TMR unconnected to set the timers to the 5-hour fast charge and 30-minute precharge default timer values.
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 use the TS function, connect a 10-kΩ fixed resistor from TS to VSS to
maintain a valid voltage level on TS.
– Ground. Connect to the thermal pad and to the ground rail of the circuit.
8 Specifications
8.1 Absolute Maximum Ratings⁽¹⁾
over the 0°C to 125°C operating free-air temperature range (unless otherwise noted)
MIN
MAX
UNIT
IN (with respect to VSS)
–0.3
28
V
V_I
Input voltage
OUT (with respect to VSS)
BAT (with respect to VSS)
–0.3
7
V
–0.3
5
V
EN1, EN2, CE, TS, ISET, PGOOD, CHG, ILIM, TMR, TD,
ITERM (with respect to VSS)
–0.3
7
V
I_I
Input current
I_O
Output current (continuous)
IN
OUT
BAT (Discharge mode)
600
mA
1700
mA
1700
mA
Output sink current
CHG, PGOOD
15
mA
T_J
Junction temperature
T_stg Storage temperature
–40
150
°C
–65
150
°C
(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. All voltage
values are with respect to the network ground terminal unless otherwise noted.
4
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