Step-Down Converter. AAT1149A Datasheet

AAT1149A Converter. Datasheet pdf. Equivalent

AAT1149A Datasheet
Recommendation AAT1149A Datasheet
Part AAT1149A
Description 2.2MHz Fast Transient 400mA Step-Down Converter
Feature AAT1149A; .
Manufacture AAT
Datasheet
Download AAT1149A Datasheet




AAT AAT1149A
SwitchRegTM
PRODUCT DATASHEET
AAT1149A
2.2MHz Fast Transient 400mA Step-Down Converter
General Description
The AAT1149A SwitchReg is a 2.2MHz step-down con-
verter with an input voltage range of 2.2V to 5.5V. It is
optimized to react quickly to load variations and operate
with a tiny 0603 inductor that is only 1mm tall.
The AAT1149A can deliver 400mA of load current and
operates in PWM only mode for low noise operation. The
2.2MHz switching frequency minimizes the size of exter-
nal components while keeping switching losses low.
The AAT1149A is optimized for low noise portable
applications.
The AAT1149A is available in a Pb-free, space-saving
5-pin wafer-level chip scale (WLCSP) package and is
rated over the -40°C to +85°C temperature range.
Features
• Ultra-Small 0603 Inductor (Height = 1mm)
• VIN Range: 2.2V to 5.5V
• VOUT Fixed 1.875V
• 400mA Max Output Current
• Up to 98% Efficiency
• 3mA No Load Quiescent Current
• 2.2MHz Switching Frequency
• 70μs Soft Start
• Fast Load Transient
• Over-Temperature Protection
• Current Limit Protection
• 100% Duty Cycle Low-Dropout Operation
• <1μA Shutdown Current
• 0.9x1.2mm WLCSP 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
AAT1149A
IN LX
EN FB
AGND PGND
PGND PGND
VOUT = 1.875V
L1 2.2µH
C1
4.7µF
1149A.2008.08.1.1
www.analogictech.com
1



AAT AAT1149A
SwitchRegTM
PRODUCT DATASHEET
AAT1149A
2.2MHz Fast Transient 400mA Step-Down Converter
Pin Descriptions
Pin #
1
2
3
4
5
Symbol
FB
EN
AGND
PGND
IN
LX
Function
Feedback input pin. Connect this pin ito the converted output voltage node.
Enable pin.
Non-power signal ground pin.
Main power ground return pins. Connect to the output and input capacitor return.
Input supply voltage for the converter.
Switching node. Connect the inductor to this pin. It is internally connected to the drain of both high- and
low-side MOSFETs.
Pin Configuration
WLCSP-5
(Top View)
FB
AGND/PGND
IN
12
3
45
EN
LX
2
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1149A.2008.08.1.1



AAT AAT1149A
SwitchRegTM
PRODUCT DATASHEET
AAT1149A
2.2MHz Fast Transient 400mA Step-Down Converter
Absolute Maximum Ratings1
Symbol
VIN
VLX
VFB
VEN
TJ
TLEAD
Description
Input Voltage to GND
LX to GND
FB to GND
EN to GND
Operating Junction Temperature Range
Maximum Soldering Temperature (at leads, 10 sec)
Value
6.0
-0.3 to VIN + 0.3
-0.3 to VIN + 0.3
-0.3 to 6.0
-40 to 150
300
Units
V
V
V
V
°C
°C
Thermal Information
Symbol
PD
θJA
Description
Maximum Power Dissipation2, 3
Thermal Resistance2
Value
352
284
Units
mW
°C/W
1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at conditions other than the operating conditions
specified is not implied. Only one Absolute Maximum Rating should be applied at any one time.
2. Mounted on an FR4 board; use the NSMD (none-solder mask defined) pad style for tighter control on the copper etch process.
3. Derate 3.52 mW/°C above 25°C.
1149A.2008.08.1.1
www.analogictech.com
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