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參數(shù)資料
| 型號： | AAT1275IRN-5.0-T1 |
| 廠商： | Advanced Analogic Technologies, Inc. |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | Boost Converter with USB Power Switch |
| 中文描述： | 加強與USB電源開關(guān)轉(zhuǎn)換器 |
| 文件頁數(shù)： | 9/19頁 |
| 文件大?。?/td> | 467K |
| 代理商： | AAT1275IRN-5.0-T1 |
AAT1275
Boost Converter with USB Power Switch
1275.2007.01.1.3
9
Functional Description
The AAT1275 is a 500mA synchronous boost con-
verter with a current-limited load switch targeted for
single-cell Lithium-ion/polymer devices acting as a
portable host for USB power.
The AAT1275 has integrated control and synchro-
nous MOSFETs, minimizing the cost and the num-
ber of external components. Additional features
include a soft-start function which allows the load
voltage to ramp up in a controlled manner, elimi-
nating output voltage overshoot and minimizing
inrush current. Typical soft-start time for the boost
converter is approximately 300μs.
The AAT1275 also has a load switch with user-pro-
grammable current limiting. The load switch reports
over-current and over-temperature conditions
through an open-drain fault reporting signal (FLT).
The fault reporting signal has a 4ms turn-on delay.
Control Scheme
The control circuit uses hysteretic current mode
control with internal inductor current sensing for
very high efficiency over a wide output current
range. For heavy load, the boost converter oper-
ates in continuous conduction mode (CCM). This
minimizes the RMS current and optimizes the effi-
ciency at load conditions where the losses are
dominated by the power MOSFET R
DS(ON)
. This
also keeps the ripple current to a minimum and
minimizes the output voltage ripple and the output
capacitor size. A zero current comparator senses
the inductor current and prevents reverse current
flow for optimum light load efficiency.
Functional Block Diagram
Boost Regulator Control
Load Switch Control
FLT
SET
EN
VCC
IN
OUT2
FB
OUT1
SW
LIN
GND
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| AAT1275ITP-5.0-T1 | 制造商:Skyworks Solutions Inc 功能描述:DC TO DC CONVERTER |
| AAT1276 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:Boost Converter with USB Power Switch |
| AAT1276IRN-5.0-T1 | 制造商:Skyworks Solutions Inc 功能描述:DC TO DC CONVERTER |
| AAT1276ITP-5.0-T1 | 制造商:Skyworks Solutions Inc 功能描述:DC TO DC CONVERTER |
| AAT1277IUT-T1 | 制造商:SKYWORKS SOLUTIONS INC 功能描述:1.5A FLASH DRIVER IC IN 18CSP TR 制造商:Skyworks Solutions Inc 功能描述:DC TO DC CONVERTER |
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