AAT2113A Datasheet, PDF (1/19 Pages) Advanced Analogic Technologies – 3MHz, Fast Transient 1.5A Step-Down Converter in 2mm x 2mm Package

PRODUCT DATASHEET
AAT2113A
SwitchReg^TM 3MHz, Fast Transient 1.5A Step-Down Converter in 2mm x 2mm Package
General Description
The AAT2113A SwitchReg™ is a 1.5A step-down con-
verter with a typical input voltage of 3.3V and a fixed
output voltage of 1.2V or an adjustable output. The
3MHz switching frequency enables the use of small
external components. The ultra-small 2mm x 2mm foot-
print and high efficiency make the AAT2113A an ideal
choice for portable applications.
The AAT2113A delivers 1.5A maximum output current
while consuming only 55μA no-load quiescent current.
Low R_DS(ON) integrated MOSFETs and 100% duty cycle
operation make the AAT2113A the ideal choice for high
output voltage, high current applications which require a
low dropout threshold.
The AAT2113A provides excellent transient response and
output accuracy across the operating range. No external
compensation is required.
The AAT2113A maintains high efficiency throughout the
load range. The unique low-noise architecture reduces
ripple and spectral noise. The AAT2113A automatically
optimizes efficiency during Light Load mode (LL) and
maintains constant frequency and low output ripple dur-
ing PWM mode.
Over-temperature and short circuit protection safeguard
the AAT2113A and system components from damage.
The AAT2113A is available in a Pb-free, ultra-small, low
profile, 8-pin 2mm x 2mm FTDFN package. The product
is rated over a temperature range of -40°C to 85°C.
Features
• 5mm x 5mm Total Solution Size
• 1.5A Maximum Output Current
• Tiny 0.47μH Chip Inductor
• Excellent Transient Response
• Input Voltage: 2.7V to 5.5V
• Ultra-small, Low Profile 8-pin 2mm x 2mm FTDFN
Package
• Fixed or Adjustable Output Voltage Options:
▪ Fixed Output Voltage: 1.2V
▪ Adjustable Output Voltage: 1.0V to 1.8V
• High Efficiency, Low Noise Architecture
• 3MHz Switching Frequency
• No External Compensation Required
• 55μA No Load Quiescent Current
• 100% Duty Cycle Low-Dropout Operation
• Internal Soft Start
• Over-Temperature and Current Limit Protection
• <1μA Shutdown Current
• -40°C to 85°C Temperature Range
Applications
• Cellular Phones
• Digital Cameras
• Hard Disk Drives
• MP3 Players
• PDAs and Handheld Computers
• Portable Media Players
• USB Devices
• Wireless Network Cards
Typical Application
Load Transient Response
(VIN = 5V; VOUT = 1.2V; IOUT = 10% to 100%;
COUT = 10µF, 6.3V, 0603)
1.3V
1.25V
1.2V
100mV
1.15V
1.1V
1.5A
150mA
VIN
2.7V to 5.5V
C1
4.7µF
6.3V
0603
C3
1.0µF
6.3V
0402
Time (20µs/div)
U1
VP
LX
EN
LX
AAT2113A
VCC
FB
AGND
PGND
FTDFN 22-8
L1
0.47µH
VOUT
1.2V/1.5A
C3
10µF
6.3V
0603
2113A.2009.06.1.1
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