Step-Down Converter. AAT2120 Datasheet

AAT2120 Converter. Datasheet pdf. Equivalent


Skyworks AAT2120
General Description
The AAT2120 SwitchReg is a 1.8MHz step-down con-
verter with an input voltage range of 2.7V to 5.5V and
output as low as 0.6V. Its low supply current, small size,
and high switching frequency make the AAT2120 the
ideal choice for portable applications.
The AAT2120 delivers up to 500mA of load current, while
maintaining a low 45μA no load quiescent current. The
1.8MHz switching frequency minimizes the size of exter-
nal components, while keeping switching losses low. The
AAT2120 feedback and control delivers excellent load
regulation and transient response with a small output
inductor and capacitor.
The AAT2120 maintains high efficiency throughout the
load range. The AAT2120’s unique architecture produces
reduced ripple and spectral noise. Over-temperature and
short-circuit protection safeguard the AAT2120 and sys-
tem components from damage.
The AAT2120 is available in a Pb-free, 8-pin, 2x2mm
STDFN package and is rated over the -40°C to +85°C
temperature range.
DATA SHEET
AAT2120
500mA Low-Noise, Step-Down Converter
Features
• VIN Range: 2.7V to 5.5V
• VOUT Range: 0.6V to VIN
• Up to 500mA Output Current
• Up to 96% Efficiency
• Low Noise Light Load Mode
• 45μA Typical Quiescent Current
• 1.8MHz Switching Frequency
• Soft-Start Control
• Over-Temperature and Current Limit Protection
• 100% Duty Cycle Low-Dropout Operation
• <1μA Shutdown Current
• Small External Components
• Ultra-Small STDFN22-8 Package
• Temperature Range: -40°C to +85°C
Applications
• Bluetooth® Headsets
• Cellular Phones
• Digital Cameras
• Handheld Instruments
• Micro Hard Disk Drive
• Portable Music Players
• USB Devices
Typical Application
VIN
C1
4.7µF
AAT2120
VP LX
VIN
EN FB
GND PGND
VO = 1.8V
L1
3.0µH
R1
118kΩ
500mA
R2
59kΩ
C2
4.7µF
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202005A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 24, 2012
1


AAT2120 Datasheet
Recommendation AAT2120 Datasheet
Part AAT2120
Description Step-Down Converter
Feature AAT2120; General Description The AAT2120 SwitchReg is a 1.8MHz step-down converter with an input voltage rang.
Manufacture Skyworks
Datasheet
Download AAT2120 Datasheet




Skyworks AAT2120
DATA SHEET
AAT2120
500mA Low-Noise, Step-Down Converter
Pin Descriptions
Pin #
1
2
3
4
5
6
7
8
EP
Symbol
VP
VIN
GND
FB
N/C
EN
LX
PGND
Function
Input power pin; connected to the source of the P-channel MOSFET. Connect to the input capacitor.
Input bias voltage for the converter.
Non-power signal ground pin.
Feedback input pin. Connect this pin to an external resistive divider for adjustable output.
No connect.
Enable pin. A logic high enables normal operation. A logic low shuts down the converter.
Switching node. Connect the inductor to this pin. It is connected internally to the drain of both high- and
low-side MOSFETs.
Input power return pin; connected to the source of the N-channel MOSFET. Connect to the output and
input capacitor return.
Exposed paddle (bottom); connect to ground directly beneath the package.
Pin Configuration
STDFN22-8
(Top View)
VP 1
VIN 2
GND 3
FB 4
8 PGND
7 LX
6 EN
5 N/C
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
2 202005A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 24, 2012



Skyworks AAT2120
DATA SHEET
AAT2120
500mA Low-Noise, Step-Down Converter
Absolute Maximum Ratings1
Symbol
VIN
VLX
VOUT
VEN
TJ
TLEAD
Description
Input Voltage and Bias Power 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
JA
Description
Maximum Power Dissipation (STDFN22-8)
Thermal Resistance2 (STDFN22-8)
Value
2
50
Units
W
°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.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202005A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 24, 2012
3







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