Step-Down Converter. AAT2146 Datasheet

AAT2146 Converter. Datasheet pdf. Equivalent


Advanced Analogic Technologies AAT2146
PRODUCT DATASHEET
AAT2146
SwitchRegTM
www.DataSheet4U.com
Low Noise, Fast Transient 600mA Step-Down Converter
General Description
The AAT2146 SwitchReg is a 2MHz step-down converter
with an input voltage range of 2.7V to 5.5V and output
voltage as low as 0.6V. It is optimized to react quickly to
a load variation. The AAT2146 incorporates a unique low
noise architecture which reduces ripple and spectral
noise.
The AAT2146 is available in fixed voltage versions with
internal feedback and a programmable version with
external feedback resistors. It can deliver 600mA of load
current while maintaining a low 37μA no load quiescent
current. The 2MHz switching frequency minimizes the
size of external components while keeping switching
losses low.
The AAT2146 is designed to maintain high efficiency
throughout the operating range, which is critical for por-
table applications.
The AAT2146 is available in the Pb-free, space-saving
2.0x2.1mm SC70JW-8 package and is rated over the
-40°C to +85°C temperature range.
Features
• VIN Range: 2.7V to 5.5V
• Low Noise Light Load Mode
• Low Ripple PWM Mode
• VOUT Fixed or Adjustable from 0.6V to VIN
• 37μA No Load Quiescent Current
• Up to 98% Efficiency
• 600mA Max Output Current
• 2MHz Switching Frequency
• 150μs 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 (Fixed Output Voltage)
U1
AAT2146
VIN VIN LX
C2
2.2µF
EN OUT
AGND PGND
PGND PGND
L1
4.7µH
VO
C1
4.7µF
2146.2008.10.1.2
www.analogictech.com
1


AAT2146 Datasheet
Recommendation AAT2146 Datasheet
Part AAT2146
Description Fast Transient 600mA Step-Down Converter
Feature AAT2146; PRODUCT DATASHEET AAT2146 TM SwitchReg www.DataSheet4U.com Low Noise, Fast Transient 600mA Step-Do.
Manufacture Advanced Analogic Technologies
Datasheet
Download AAT2146 Datasheet




Advanced Analogic Technologies AAT2146
PRODUCT DATASHEET
AAT2146
SwitchRegTM
www.DataSheet4U.com
Low Noise, Fast Transient 600mA Step-Down Converter
Pin Descriptions
Pin #
1
2
3
4
5
6, 7, 8
Symbol
EN
OUT
VIN
LX
AGND
PGND
Function
Enable pin.
Feedback input pin. This pin is connected either directly to the converter output or to an external
resistive divider for an adjustable output.
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.
Non-power signal ground pin.
Main power ground return pins. Connect to the output and input capacitor return.
Pin Configuration
SC70JW-8
(Top View)
EN 1
OUT 2
VIN 3
LX 4
8 PGND
7 PGND
6 PGND
5 AGND
2
www.analogictech.com
2146.2008.10.1.2



Advanced Analogic Technologies AAT2146
PRODUCT DATASHEET
AAT2146
SwitchRegTM
www.DataSheet4U.com
Low Noise, Fast Transient 600mA Step-Down Converter
Absolute Maximum Ratings1
Symbol
VIN
VLX
VOUT
VEN
TJ
TLEAD
Description
Input Voltage GND
LX to GND
OUT 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 VIN + 0.3
-40 to 150
300
Units
V
V
V
V
°C
°C
Thermal Information
Symbol
PD
θJA
Description
Maximum Power Dissipation2, 3
Thermal Resistance2
Value
625
160
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.
3. Derate 6.25mW/°C above 25°C.
2146.2008.10.1.2
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