BQ24050 Datasheet, PDF (8/37 Pages) Texas Instruments – 800mA Single Cell Li-Ion Battery Charger With Automatic Adaptor/USB Detection

bq24050
bq24052
bq24055
SLUS940A – SEPTEMBER 2009 – REVISED SEPTEMBER 2009.................................................................................................................................... www.ti.com
PIN CONFIGURATION
bq24050/2
bq24055
1 _IN
OUT ¹⁰
1 _IN
OUT ¹²
2 _ISET
TS ⁹
2 _ISET
TS ¹¹
3 _VSS
CHG ⁸
3 _VSS
CHG ¹⁰
4 _{PRETERM ISET 2} 7
4 PRETERM _ISET2 9
5 _D+
D- ⁶
5 _D+
D- ⁸
6 _PG
NC ⁷
NAME
IN
OUT
bq24050/2
1
bq24055
1
10
12
PRE-TERM
4
4
ISET
ISET2
2
2
7
9
TS
9 ⁽¹⁾
11
VSS
CHG
3
3
8
10
PG
D+
D–
NC
Thermal
PAD and
Package
–
6
5
5
6
8
–
7
Pad 2x2mm²
Pad
2x3mm²
(1) Spins have different pin definitions
PIN FUNCTIONS
I/O DESCRIPTION
I
Input power, connected to external DC supply (AC adapter or USB port). Expected range
of bypass capacitors 1μF to 10μF, connect from IN to V_SS.
Battery Connection. System Load may be connected. Average load should not be
O excessive, allowing battery to charge within the 10 hour safety timer window. Expected
range of bypass capacitors 1μF to 10μF.
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.
I
Expected range of programming resistor is 1k to 10kΩ (2k: I_OUT/10 for term; I_OUT/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).
Programming the Input/Output Current Limit for the USB or Adaptor source: High =
I 500mAmax, Low = ISET, FLOAT = 100mA max. D+D– Detection initially sets the charge
threshold and requires ISET2 to change states to take control.
Temperature sense pin connected to ‘50/55 –10k at 25C NTC thermistor, ’52 – 100k NTC
at 25°C, in the battery pack. Floating TS Pin or pulling High puts part in TTDM and disable
I
TS monitoring, Timers and Termination. Pulling pin Low disables the IC ( CE function). If
NTC sensing is not needed, connect this pin to VSS through an external ‘50/55-10kΩ
/’52-100kΩ resistor. A ‘50/55-250kΩ/’52-880kΩ from TS to ground will prevent IC entering
TTDM 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
and less than V_OVP
I USB port D+ input connection
I USB port D– input connection
NA Do not make connection to this pin (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.
8
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