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參數(shù)資料
| 型號(hào)： | AAT1276 |
| 廠商： | Advanced Analogic Technologies, Inc. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Boost Converter with USB Power Switch |
| 中文描述： | 加強(qiáng)與USB電源開關(guān)轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 9/18頁(yè) |
| 文件大小： | 363K |
| 代理商： | AAT1276 |
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AAT1276
Boost Converter with USB Power Switch
SwitchReg
TM
PRODUCT DATASHEET
1276.2007.11.1.1
9
w w w . a n a l o g i c t e c h . c o m
Functional Description
The AAT1276 is a 500mA synchronous boost converter
with a current-limited load switch targeted for single-cell
Lithium-ion/polymer devices acting as a portable host
for USB power.
The AAT1276 has integrated control and synchronous
MOSFETs, minimizing the cost and the number of exter-
nal components. Additional features include a soft-start
function which allows the load voltage to ramp up in a
controlled manner, eliminating output voltage overshoot
and minimizing inrush current. Typical soft-start time
for the boost converter is approximately 300
μ
s.
The AAT1276 also has a load switch with user-program-
mable current limiting. The load switch reports over-
current and over-temperature conditions through an
open-drain fault reporting signal (FLT). The fault report-
ing 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 effi-
ciency over a wide output current range. For heavy load,
the boost converter operates in continuous conduction
mode (CCM). This minimizes the RMS current and opti-
mizes the efficiency 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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| AAT1276IRN-5.0-T1 | Boost Converter with USB Power Switch |
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| AAT1351-S1 | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| AAT1351-S1-T | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| AAT1278IUP-T1 | 制造商:Skyworks Solutions Inc 功能描述:DC TO DC CONVERTER |
| AAT1282IWO-T1 | 制造商:Skyworks Solutions Inc 功能描述:DC TO DC CONVERTER |
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