AAT2158_08 Datasheet, PDF (1/16 Pages) Advanced Analogic Technologies – 1.5A Low Noise Step-Down Converter

SwitchReg^TM
General Description
The AAT2158 SwitchReg is a 1.5A step-down converter
with an input voltage range of 2.4V to 5.5V and an adjust-
able output voltage from 0.6V to V_IN. The 1.4MHz switch-
ing frequency enables the use of small external compo-
nents. The small footprint and high efficiency make the
AAT2158 an ideal choice for portable applications.
The AAT2158 delivers 1.5A maximum output current
while consuming only 42μA of no-load quiescent current.
Ultra-low R_DS(ON) integrated MOSFETs and 100% duty
cycle operation make the AAT2158 an ideal choice for
high output voltage, high current applications which
require a low dropout threshold.
The AAT2158 provides excellent transient response and
high output accuracy across the operating range. No
external compensation components are required.
The AAT2158 maintains high efficiency throughout the
load range. The AAT2158’s unique architecture produces
reduced ripple and spectral noise. Over-temperature and
short-circuit protection safeguard the AAT2158 and sys-
tem components from damage.
The AAT2158 is available in a Pb-free, space-saving
16-pin 3x3mm QFN package. The product is rated over
an operating temperature range of -40°C to +85°C.
PRODUCT DATASHEET
AAT2158
1.5A Low Noise Step-Down Converter
Features
• 1.5A Maximum Output Current
• Input Voltage: 2.4V to 5.5V
• Output Voltage: 0.6V to V_IN
• Up to 95% Efficiency
• Low Noise Light Load Mode
• 42μA No Load Quiescent Current
• No External Compensation Required
• 1.4MHz Switching Frequency
• 100% Duty Cycle Low-Dropout Operation
• Internal Soft Start
• Over-Temperature and Current Limit Protection
• <1μA Shutdown Current
• 16-Pin 3x3mm QFN Package
• Temperature Range: -40°C to +85°C
Applications
• Cellular Phones
• Digital Cameras
• Hard Disk Drives
• MP3 Players
• PDAs and Handheld Computers
• Portable Media Players
• USB Devices
Typical Application
3.3V
C1
10µF
U1
AAT2158
12 _VP
FB ⁴
11 _VP
LX ¹⁵
10 _VP
LX ¹⁴
7 _EN
LX ¹³
9 _VCC
N/C ¹⁶
6 _{N/C PGND} 3
8 _{N/C PGND} 2
5 _{SGND PGND} 1
L1
2.2µH
2.5V
R3
187k
R4
59k
C3
22µF
2158.2008.02.1.2
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