BQ24075-Q1 Datasheet, PDF (6/36 Pages) Texas Instruments – 1.5A USB-FRIENDLY Li-Ion BATTERY CHARGER AND POWER-PATH MANAGEMENT IC

bq24075-Q1
SLUSAU3B – FEBRUARY 2012 – REVISED MARCH 2012
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ELECTRICAL CHARACTERISTICS (continued)
Over ambient temperature range (-40C° ≤ T_A ≤ 125°C) and the recommended supply voltage range (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX UNIT
LOGIC LEVELS ON EN1, EN2, CE, SYSOFF
V_IL
Logic LOW input voltage
V_IH
Logic HIGH input voltage
I_IL
Input sink current
I_IH
Input source current
LOGIC LEVELS ON PGOOD, CHG
V_IL= 0V
V_IH= 1.4V
0
0.4
V
1.4
6
V
1 μA
10 μA
V_OL
Output LOW voltage
I_SINK = 5 mA
0.4
V
RGT PACKAGE
(Top View)
TS
BAT
BAT
CE
16 15 14 13
1
12
2
11
bq24075-Q1
3
10
4
9
5 678
ILIM
OUT
OUT
CHG
NAME
TS
BAT
CE
EN2
EN1
PGOOD
VSS
CHG
OUT
ILIM
PIN
NO.
1
2, 3
4
5
6
7
8
9
10, 11
12
PIN FUNCTIONS
I/O
DESCRIPTION
External NTC Thermistor Input. Connect the TS input to the NTC thermistor in the battery pack. TS
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monitors a 10kΩ NTC thermistor. For applications that do not utilize the TS function, connect a 10kΩ
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
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standby mode. In 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.
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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
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internally pulled down with ≉285 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
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detected. PGOOD is high-impedance when the input power is not within specified limits. Connect
PGOOD to the desired logic voltage rail using a 1kΩ-100kΩ resistor, or use with an LED for visual
indication.
–
Ground. Connect to the thermal pad and to the ground rail of the circuit.
Open-Drain Charging Status Indication Output. CHG pulls to VSS when the battery is charging. CHG is
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high impedance when charging is complete and when charger is disabled. Connect CHG to the desired
logic voltage rail using a 1kΩ-100kΩ resistor, or use with an LED for visual indication.
System Supply Output. OUT provides a regulated output when the input is below the OVP threshold and
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above the regulation voltage. When the input is out of the operation range, OUT is connected to V_BAT
except when SYSOFF is high. Connect OUT to the system load. Bypass OUT to VSS with a 4.7 μF to
47 μF ceramic capacitor.
Adjustable Current Limit Programming Input. Connect a 1100 Ω to 8 kΩ resistor from ILIM to VSS to
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program the maximum input current (EN2=1, EN1=0). The input current includes the system load and
the battery charge current. Leaving ILIM unconnected disables all charging.
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