BQ24072 Datasheet, PDF (6/38 Pages) Texas Instruments – 1.2A USB-FRIENDLY Li-Ion BATTERY CHARGER AND POWER-PATH MANAGEMENT IC

bq24072, bq24073
bq24074, bq24075
SLUS810A – SEPTEMBER 2008 – REVISED DECEMBER 2008...................................................................................................................................... www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
Over junction temperature range (0° ≤ T_J ≤ 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, TD
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
6V
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 bq24072 11
3 ^bq24073 10
4
9
5 678
ILIM
OUT
OUT
CHG
TS
BAT
BAT
CE
16 15 14 13
1
12
2
11
bq24074
3
10
4
9
5 678
ILIM
OUT
OUT
CHG
TS
BAT
BAT
CE
16 15 14 13
1
12
2
11
bq24075
3
10
4
9
5 678
ILIM
OUT
OUT
CHG
NAME
TS
BAT
CE
EN2
EN1
PGOOD
VSS
CHG
OUT
ILIM
IN
TERMINAL
NO.
'72, '73 '74
'75
1
1
1
2, 3
2, 3
2, 3
4
4
4
5
5
5
6
6
6
7
7
7
8
8
8
9
9
9
10, 11 10, 11 10, 11
12
12
12
13
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
I 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 standby
I
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.
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
I _{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
O 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 high
O 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
O
above the regulation voltage. When the input is out of the operation range, OUT is connected to V_BAT except
when SYSOFF is high (bq24075 only). 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 program
I 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.
Input Power Connection. Connect IN to the external DC supply (AC adapter or USB port). The input operating
I
range is 4.35V to 6.6V (bq24072, bq24073, and bq24075) or 4.35V to 10.5V (bq23074). The input can accept
voltages up to 26V without damage but operation is suspended. Connect bypass capacitor 1 µF to 10 µF to
VSS.
6
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