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參數(shù)資料
| 型號(hào)： | AAT2554 |
| 廠商： | Advanced Analog Technology,lnc. |
| 英文描述： | Total Power Solution for Portable Applications |
| 中文描述： | 總功率便攜式應(yīng)用解決方案 |
| 文件頁數(shù)： | 20/33頁 |
| 文件大小： | 877K |
| 代理商： | AAT2554 |
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AAT2554
Total Power Solution for Portable Applications
20
2554.2007.01.1.2
Application Information
Soft Start / Enable
The EN_BAT pin is internally pulled down. When
pulled to a logic high level, the battery charger is
enabled. When left open or pulled to a logic low level,
the battery charger is shut down and forced into the
sleep state. Charging will be halted regardless of the
battery voltage or charging state. When it is re-
enabled, the charge control circuit will automatically
reset and resume charging functions with the appro-
priate charging mode based on the battery charge
state and measured cell voltage from the BAT pin.
Separate ENA and ENB inputs are provided to
independently enable and disable the LDO and
step-down converter, respectively. This allows
sequencing of the LDO and step-down outputs dur-
ing startup.
The LDO is enabled when the ENA pin is pulled
high. The control and feedback circuits have been
optimized for high-speed, monotonic turn-on char-
acteristics.
The step-down converter is enabled when the ENB
pin is pulled high. Soft start increases the inductor
current limit point in discrete steps when the input
voltage or ENB input is applied. It limits the current
surge seen at the input and eliminates output voltage
overshoot. When pulled low, the ENB input forces the
AAT2554 into a low-power, non-switching state. The
total input current during shutdown is less than 1μA.
Adapter or USB Power Input
Constant current charge levels up to 500mA may
be programmed by the user when powered from a
sufficient input power source. The battery charger
will operate from the adapter input over a 4.0V to
6.5V range. The constant current fast charge cur-
rent for the adapter input is set by the R
SET
resistor
connected between ISET and ground. Refer to
Table 1 for recommended R
SET
values for a desired
constant current charge level.
Programming Charge Current
The fast charge constant current charge level is
user programmed with a set resistor placed
between the ISET pin and ground. The accuracy of
the fast charge, as well as the preconditioning trick-
le charge current, is dominated by the tolerance of
the set resistor used. For this reason, a 1% toler-
ance metal film resistor is recommended for the set
resistor function. Fast charge constant current lev-
els from 15mA to 500mA may be set by selecting
the appropriate resistor value from Table 1.
Table 1: R
SET
Values.
Figure 2: Constant Charging Current
vs. Set Resistor Values.
Charge Status Output
The AAT2554 provides battery charge status via a
status pin. This pin is internally connected to an N-
channel open drain MOSFET, which can be used to
drive an external LED. The status pin can indicate
several conditions, as shown in Table 2.
R
SET
(k
Ω
)
I
C
1
10
100
1000
1
10
100
1000
Normal
I
CHARGE
(mA)
500
400
300
250
200
150
100
50
40
30
20
15
Set Resistor
Value R1 (k
Ω
)
3.24
4.12
5.36
6.49
8.06
10.7
16.2
31.6
38.3
53.6
78.7
105
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AAT2554IRN-CAP-T1 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:Total Power Solution for Portable Applications |
| AAT2554IRN-CAQ-T1 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:Total Power Solution for Portable Applications |
| AAT2554IRN-CAT-T1 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:Total Power Solution for Portable Applications |
| AAT2554IRN-CAW-T1 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:Total Power Solution for Portable Applications |
| AAT2556 | 制造商:AAT 制造商全稱:AAT 功能描述:Battery Charger and Step-Down Converter for Portable Applications |
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