AAT1153 Datasheet, PDF (1/19 Pages) Advanced Analogic Technologies – 2A Step-Down Converter

General Description
The AAT1153 SwitchReg™ is a 1.2MHz constant fre-
quency current mode PWM step-down converter. It is
ideal for portable equipment requiring very high current
up to 2A from single-cell Lithium-ion batteries while still
achieving over 90% efficiency during peak load condi-
tions. The AAT1153 also can run at 100% duty cycle for
low dropout operation, extending battery life in portable
systems while light load operation provides very low
output ripple for noise sensitive applications.
The AAT1153 can supply up to 2A output load current
from a 2.5V to 5.5V input voltage and the output voltage
can be regulated as low as 0.6V. The high switching fre-
quency minimizes the size of external components while
keeping switching losses low. The internal slope compen-
sation setting allows the device to operate with smaller
inductor values to optimize size and provide efficient
operation.
The AAT1153 is available with adjustable (0.6V to V_IN)
output voltage. The device is available in a Pb-free, 3mm
x 3mm 10-lead TDFN package and is rated over the
-40°C to +85°C temperature range.
DATA SHEET
AAT1153
2A Step-Down Converter
Features
• Input Voltage Range: 2.5V to 5.5V
• Output Voltages from 0.6V to V_IN
• 2A Output Current
• High Efficiency: Up to 95%
• 1.2MHz Constant Switching Frequency
• Low R_DS(ON) Internal Switches: 0.15Ω
• Allows Use of Ceramic Capacitors
• Current Mode Operation for Excellent Line and Load
Transient Response
• Short-Circuit and Thermal Fault Protection
• Soft Start
• Low Dropout Operation: 100% Duty Cycle
• Low Shutdown Current: I_SHUTDOWN < 1μA
• TDFN33-10 Package
• -40°C to +85°C Temperature Range
Applications
• Cellular Phones
• Digital Cameras
• DSP Core Supplies
• PDAs
• Portable Instruments
• Smart Phones
Typical Application
V_IN 2.5V-5.5V
C1
22μF
1 _EN
LX ⁸
2 _IN
LX ⁷
3 _{AIN AAT1153 FB} 5
6 _AGND
4 _AGND
PGND ¹⁰
PGND ⁹
L1
2.2μH
V_OUT
1.8V, 2A
R1
634kΩ
R2
316kΩ
C2
22μF
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
201992B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 18, 2013
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