AAT2148 Datasheet, PDF (1/18 Pages) Skyworks Solutions Inc. – Low-Noise, Fast Transient 1A Step-Down Converter

DATA SHEET
AAT2148
Low-Noise, Fast Transient 1A Step-Down Converter
General Description
The AAT2148 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 AAT2148 incorporates a unique low
noise architecture which reduces ripple and spectral
noise.
The AAT2148 is available in fixed voltage versions with
internal feedback and a programmable version with
external feedback resistors. It can deliver 1A of load cur-
rent 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 AAT2148 is designed to maintain high efficiency
throughout the operating range, which is critical for por-
table applications.
The AAT2148 is available in the Pb-free, thermally
enhanced 3x3mm QFN-16 package and is rated over the
-40°C to +85°C temperature range.
Features
• V_IN Range: 2.7V to 5.5V
• Low Noise Light Load Mode
• Low Ripple PWM Mode
• V_OUT Fixed or Adjustable from 0.6V to V_IN
• 37μA No Load Quiescent Current
• Up to 98% Efficiency
• 1A 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
• QFN33-16 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 (Adjustable Output Voltage)
V_IN
2.7V - 5.5V
C1
4.7μF
U1
AAT2148
12 _VP
11 _VP
10 _VP
9 _VCC
7 _EN
3 _PGND
LX ¹³
LX ¹⁴
LX ¹⁵
FB ⁴
PGND ²
PGND ¹
L1 4.7μH
R1
118k
R2
59k
V_O
1.8V, 1A
C2
4.7μF
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
202009A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 28, 2012
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