AAT2114A Datasheet, PDF (1/16 Pages) Skyworks Solutions Inc. – 2.5A Low-Noise, Fast Transient 3MHz Step-Down Regulator

DATA SHEET
AAT2114A
2.5A Low-Noise, Fast Transient 3MHz Step-Down Regulator
General Description
The AAT2114A SwitchReg™ step-down converter deliv-
ers up to 2.5A to support the adjustable 1.0V to V_IN
output from the 2.7V to 5.5V input source. The 3MHz
switching frequency allows a high-bandwidth design that
minimizes the external LC component requirements.
The AAT2114A high-frequency converter consumes only
70μA no-load quiescent current. The internally compen-
sated, high-frequency, current-mode control scheme pro-
vides excellent transient response, minimal output ripple,
and reduced spectral noise. Additionally, the AAT2114A
provides tight output accuracy across the entire load and
input voltage operating ranges.
The regulator maintains high efficiency by integrating
the high-side and low-side MOSFETs and designing the
gate drivers to minimize dead-time switching losses. The
regulator also reduces the switching frequency under
light load conditions, minimizing power loss over the
entire load range.
For system fault protection, the AAT2114A includes over-
temperature and short-circuit current-limit protection to
safeguard the AAT2114A and system components from
overload conditions.
The compact 3mm x 3mm QFN package footprint, mini-
mal LC requirements, and high efficiency make the
AAT2114A an ideal choice for low-power portable applica-
tions operating from a Li-ion/polymer battery.
Features
• 2.5A Maximum Output Current
• 3MHz Switching Frequency
▪ Stable With 20μF Output Capacitor
• 2.7V to 5.5V Input Voltage Range
• Adjustable 1.0V to V_{IN Output Voltage}
• Up to 95% Efficiency
• Excellent Current-Mode Transient Response
• Low-Noise Light-Load Architecture
• 70μA No Load Quiescent Current
• No External Compensation Required
• Internal Soft Start
• Over-Temperature and Current-Limit Protection
• <1μA Shutdown Current
• -40°C to +85°C Temperature Range
• 16-Pin, 3mm x 3mm QFN Package
Applications
• Cellular Phones
• Digital Cameras
• MP3/Portable Media Players
• Wireless Cards
Typical Application
Load Transient Response
(250mA to 2.5A; VIN = 3.6V; VOUT = 1.2V;
COUT = 2x10µF; CFF = 100pF)
1.4
1.3
190mV
1.2
1.1
3
2
1
0
Time (50µs/div)
V_IN
2.7V-5.5V ⁹
10,11,12
C_IN
10μF
6V
1, 2, 3
0603
ON ₇
OFF
8
L1 0.47μH
VCC
VP
13,14,15
LX
16
N/C
AAT2114A
R_FBH
59kΩ
PGND ^{FB 4}
6
N/C
5
EN SGND
EP
N/C GND
R_FBL
59kΩ
V_OUT
1.2V, 2.5A
C_FF
100pF
C_OUT
2x10μF
6V
0603
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
202004C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 18, 2013
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