BQ24090_2 Datasheet, PDF (7/32 Pages) Texas Instruments – 1A, Single-Input, Single Cell Li-Ion Battery Charger

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PIN CONFIGURATION
bq2409x
1 IN
OUT ¹⁰
2 ISET
TS ⁹
3 VSS
CHG 8
4 PRETERM _ISET2 7
5 _PG
NC ⁶
bq24090, bq24091
bq24092, bq24093
SLUS968B – JANUARY 2010 – REVISED JUNE 2010
NAME
PIN
IN
1
OUT
10
PRE-TERM
4
ISET
2
ISET2
7
TS
9
VSS
3
CHG
8
PG
5
NC
6
Thermal PAD Pad
and Package 5x3mm²
PIN FUNCTIONS
I/O DESCRIPTION
I
Input power, connected to external DC supply (AC adapter or USB port). Expected range of bypass
capacitors 1mF to 10mF, connect from IN to V_SS.
Battery Connection. System Load may be connected. Average load should not be excessive, allowing
O battery to charge within the 10 hour safety timer window. Expected range of bypass capacitors 1mF to
10mF.
I
Programs the Current Termination Threshold (5 to 50% of Iout which is set by ISET) and Sets the
Pre-Charge Current to twice the Termination Current Level.
Expected range of programming resistor is 1k to 10kΩ (2k: Ipgm/10 for term; Ipgm/5 for precharge)
I
Programs the Fast-charge current setting. External resistor from ISET to VSS defines fast charge current
value. Range is 10.8k (50mA) to 675 Ω (800mA).
I
Programming the Input/Output Current Limit for the USB or Adaptor source:
High = 500mAmax, Low = ISET, FLOAT = 100mAmax.
Temperature sense pin connected to bq24090/2 -10k at 25°C NTC thermistor & bq24091/3 -100k at
25°C NTC thermistor, in the battery pack. Floating TS Pin or pulling High puts part in TTDM “Charger”
I Mode and disable TS monitoring, Timers and Termination. Pulling pin Low disables the IC. If NTC
sensing is not needed, connect this pin to VSS through an external 10 kΩ/100kΩ resistor. A 250kΩ from
TS to ground will prevent IC entering TTDM mode when battery with thermistor is removed.
– Ground terminal
O Low (FET on) indicates charging and Open Drain (FET off) indicates no Charging or Charge complete.
O Low (FET on) indicates the input voltage is above UVLO and the OUT (battery) voltage.
NA Do not make a connection to this pin (for internal use) – Do not route through this pin
There is an internal electrical connection 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. VSS pin must be
connected to ground at all times
Copyright © 2010, Texas Instruments Incorporated
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7
Product Folder Link(s): bq24090 bq24091 bq24092 bq24093