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參數(shù)資料
| 型號： | AAT1276IRN-5.0-T1 |
| 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 |
| 文件頁數(shù)： | 1/18頁 |
| 文件大小： | 363K |
| 代理商： | AAT1276IRN-5.0-T1 |
AAT1276
Boost Converter with USB Power Switch
SwitchReg
TM
PRODUCT DATASHEET
1276.2007.11.1.1
1
w w w . a n a l o g i c t e c h . c o m
General Description
The AAT1276 SwitchReg is a 2MHz, 500mA synchronous
boost converter with an integrated current-limiting load
switch controlled output. The AAT1276 operates from a
single-cell Lithium-ion/ polymer battery source and pro-
vides a regulated 5V, current limit controlled output to
support USB port V
BUS
applications in portable consumer
electronic products. The AAT1276 can support both USB
2.0 host port and USB on-the-go operation, as well as
general purpose applications where a 5V supply with a
user programmable current limit is needed.
The high efficiency boost converter section of the
AAT1276 is typically set for a 5V output and can deliver
up to 500mA load current to support USB V
BUS
operation
from an input supply as low as 2.7V. The high boost
converter switching frequency (up to 2.0MHz) provides
fast load transient and allows the use of small external
components. Fully integrated control circuitry simplifies
system design and reduces total solution size.
The integrated, programmable current limiting load
switch provides USB port protection for portable devices
allowing the AAT1276 to supply a 5V USB V
BUS
up to
500mA. The load switch provides an active low fault flag
to alert the system in the event of an over-current condi-
tion applied to the AAT1276 output.
The AAT1276 is available in the Pb-free, space-saving
12-pin TSOPJW and 16-pin TDFN34 packages and is
rated over the -40°C to +85°C operating temperature
range.
Features
High Frequency Boost With 5V / 500mA Output Capability
From a Single-Cell Lithium-Ion/Polymer Battery
Input Voltage Range: 2.7V to 5V
V
OUT1
Adjustable or Fixed (5V)
>90% Efficiency
Up to 2MHz Switching Frequency
True Load Disconnect
Load Switch With Programmable Current Limit
Over-Temperature, Over-Current Protection
Inrush Current Limit
Fault Report
Low Shutdown Current < 1
μ
A Typical
-40°C to +85°C Temperature Range
TSOPJW-12 and TDFN34-16 Packages
Applications
USB On-the-Go
Cell Phones
Digital Still Cameras
PDAs and Portable Media Players
Smart Phones
Other Hand-Held Devices
Typical Application
AAT1276
IN
OUT1
LIN
SW
FB
OUT2
GND
10k
VCC
FLT
EN
SET
C
4.7μF
C
4.7μF
C
OUT2
1μF
R
FB2
59k
R
SET
V
IN
R
432k
L1 2.2μH
V
BUS
Output
Enable
Fault
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