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參數(shù)資料
| 型號： | BQ24003RGWTR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC20 |
| 封裝： | 5 X 5 MM, PLASTIC, QFN-20 |
| 文件頁數(shù)： | 6/31頁 |
| 文件大?。?/td> | 1000K |
| 代理商： | BQ24003RGWTR |
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bq24001
bq24002
bq24003
SLUS462E SEPTEMBER 2000 REVISED NOVEMBER 2004
www.ti.com
14
Charge Qualification and Preconditioning
The bq2400x starts a charge cycle when power is applied
while a battery is present. Charge qualification is based on
battery voltage and the APG/THERM input.
As shown in the block diagram, the internal LowV
comparator output prevents fast-charging a deeply
depleted battery. When set, charging current is provided
by a dedicated precharge current source. The precharge
timer limits the precharge duration. The precharge current
also minimizes heat dissipation in the pass element during
the initial stage of charge.
The APG/THERM input can also be configured to monitor
either the adapter power or the battery temperature using
a thermistor. The bq2400x suspends charge if this input is
outside the limits set by the user. Please refer to the
APG/THERM input section for additional details.
APG/THERM Input
The bq400x continuously monitors temperature or system
input voltage by measuring the voltage between the
APG/THERM (adapter power good/thermistor) and GND.
For temperature, a negative- or a positive- temperature
coefficient thermistor (NTC, PTC) and an external voltage
divider typically develop this voltage (see Figure 16). The
bq2400x compares this voltage against its internal VTP1
and VTP2 thresholds to determine if charging is allowed.
(See Figure 17.)
U1
N/C
120
IN
OUT
219
IN
OUT
318
VCC
VSENSE
417
ISNS
AGND
516
N/C
STAT2
615
APG/THM
STAT1
714
VSEL
CR
912
EN
TMR SEL
813
GND
N/C
10
11
bq24002PWP
TEMP
PACK+
PACK
RT1
C3
0.22
F
+
Battery Pack
RT2
NTC Thermistor
Figure 16. Temperature Sensing Circuit
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