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參數(shù)資料
| 型號(hào)： | AAT2550 |
| 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(yè)數(shù)： | 25/35頁(yè) |
| 文件大?。?/td> | 914K |
| 代理商： | AAT2550 |
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The maximum output capacitor RMS ripple current
is given by:
Dissipation due to the RMS current in the ceramic
output capacitor ESR is typically minimal, resulting in
less than a few degrees rise in hot-spot temperature.
Adjustable Output Resistor Selection
For applications requiring an adjustable output volt-
age, the 0.6V version can be externally pro-
grammed. Resistors R7 through R10 of Figure 4 pro-
gram the output to regulate at a voltage higher than
0.6V. To limit the bias current required for the exter-
nal feedback resistor string while maintaining good
noise immunity, the minimum suggested value for
R7 and R9 is 59k
Ω
. Although a larger value will fur-
ther reduce quiescent current, it will also increase
the impedance of the feedback node, making it more
sensitive to external noise and interference. Table 6
summarizes the resistor values for various output
voltages with R7 and R9 set to either 59k
Ω
for good
noise immunity or 221k
Ω
for reduced no load input
current.
Table 6: Adjustable Resistor Values for Use
With 0.6V Step-Down Converter.
The adjustable version of the AAT2550, combined
with an external feedforward capacitor (C10 and
C11 in Figure 4), delivers enhanced transient
response for extreme pulsed load applications. The
addition of the feedforward capacitor typically
requires a larger output capacitor for stability.
Thermal Considerations
The AAT2550 is available in a 4x4mm QFN pack-
age, which has a typical thermal resistance of
28°C/W when the exposed paddle is soldered to a
printed circuit board (PCB) in the manner dis-
cussed in the Printed Circuit Board Layout section
of this datasheet. Thermal resistance will vary with
the PCB area, ground plane area, size and number
of other adjacent components, and the heat they
generate. The maximum ambient operating tem-
perature is limited by either the design derating cri-
teria, the over-temperature shutdown temperature,
or the thermal loop charge current reduction con-
trol. To calculate the junction temperature, sum the
step-down converter losses with the battery charg-
er losses. Multiply the total losses by the package
thermal resistance and add to the ambient temper-
ature to determine the junction temperature rise.
P
SD
is the total loss associated with both step-down
converters and P
C
is the loss associated with the
charger. The total losses will vary considerably
depending on input voltage, load, and charging
current. While charging a battery, the current capa-
bility of the step-down converters is limited.
T
J(MAX)
= (P
SD
+ P
C
) ·
θ
JA
+ T
AMB
R8 = V
·
R7 = 0.6V
·
59k
Ω
= 88.5k
Ω
REF
V
OUT
1.5V
R7, R9 = 59k
Ω
R8, R10 (k
Ω
)
19.6
29.4
39.2
49.9
59.0
68.1
78.7
88.7
118
124
137
187
267
R7, R9 = 221k
Ω
R8, R10 (k
Ω
)
75
113
150
187
221
261
301
332
442
464
523
715
1000
V
OUT
(V)
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
1.8
1.85
2.0
2.5
3.3
1
2
3
V
OUT
· (V
IN(MAX)
- V
OUT
)
L
·
F
S
·
V
IN(MAX)
RMS(MAX)
I
=
·
·
AAT2550
Total Power Solution for Portable Applications
2550.2006.07.1.0
25
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AAT2550_08 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:Total Power Solution for Portable Applications |
| AAT2550ISK-CAA-T1 | 制造商:Skyworks Solutions Inc 功能描述:Voltage Regulators - Switching Regulators 2 step-down conv + battery charger 制造商:Skyworks Solutions Inc 功能描述:DC TO DC CONVERTER |
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| AAT2552_08 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:Total Power Solution for Portable Applications |
| AAT2552IRN-CAE-T1 | 功能描述:電荷泵 Total Pwr Solution for Portable App RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube |
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