 English |
|
|
|
|
|
|
|
| AAT1149 Datasheet, PDF (1/20 Pages) Advanced Analogic Technologies – 3MHz Fast Transient 400mA Step-Down Converter | |||
| |||
|
General Description
The AAT1149 SwitchReg is a 3.0MHz step-down
converter with an input voltage range of 2.7V to
5.5V and output voltage as low as 1.0V. It is opti-
mized to react quickly to load variations and oper-
ate with a tiny 0603 inductor that is only 1mm tall.
The AAT1149 output voltage is programmable via
external feedback resistors. It can deliver 400mA of
load current while maintaining a low 45μA no load
quiescent current. The 3.0MHz switching frequen-
cy minimizes the size of external components while
keeping switching losses low.
The AAT1149 maintains high efficiency throughout
the operating range, which is critical for portable
applications.
The AAT1149 is available in a Pb-free, space-saving
2.0x2.1mm SC70JW-8 package and is rated over
the -40°C to +85°C temperature range.
AAT1149
3MHz Fast Transient
400mA Step-Down Converter
Features
SwitchRegâ¢
⢠Ultra-Small 0603 Inductor (Height = 1mm)
⢠VIN Range: 2.7V to 5.5V
⢠VOUT Adjustable from 1.0V to VIN
⢠400mA Max Output Current
⢠Up to 98% Efficiency
⢠45μA No Load Quiescent Current
⢠3.0MHz Switching Frequency
⢠70μs Soft Start
⢠Fast Load Transient
⢠Over-Temperature Protection
⢠Current Limit Protection
⢠100% Duty Cycle Low-Dropout Operation
⢠<1μA Shutdown Current
⢠SC70JW-8 Package
⢠Temperature Range: -40°C to +85°C
Applications
⢠Cellular Phones
⢠Digital Cameras
⢠Handheld Instruments
⢠Microprocessor / DSP Core / IO Power
⢠PDAs and Handheld Computers
⢠USB Devices
Typical Application
VIN = 3.6V
C2
4.7µF
U1
AAT1149
IN
LX
EN
FB
AGND PGND
PGND PGND
VOUT = 1.8V
L1 1.8µH
R1
118k
R2
59k
C1
4.7µF
1149.2006.11.1.0
1
|
▷ |
German
Russian
Spanish
Italian
Polish
Chinese
Japanese
Korean
French
Portuguese