AME, Inc.
AME5172
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General Description
The AME5172 is a high-efficiency, current mode, syn-
chronous PWM Boost DC-DC Converter with fixed 3.3V
output voltage for system applications powered by single
or double cell NiMH or Alkaline battery pack.
Built-in 0.35Ω NMOS switch and 0.45Ω PMOS syn-
chronous rectification significantly improves efficiency and
reduces external components count. High switching fre-
quency (at 1.2MHz) allows easy filtering and faster loop
performance.
AME5172 uses SOT-25 package that gives a small size
solution.
0.85V Single Cell Boost
DC-DC Converter
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Typical Application
L1
4.7µH
V
IN
C
IN
4.7µF
1
5
V
OUT
3.3V
up to 200mA
C
OUT
4.7µF
IN
SW
AME5172
OUT
OFF ON
3
EN
GND
4
2
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Features
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PWM Control with 1.2MHz Fixed Frequency
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Up to 92% Efficiency
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0.85V Low Start-up Input Voltage
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Internal Synchronous Rectifier
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Fixed 3.3V Output Voltage Options
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0.8A, 0.35Ω Power MOSFET
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1µA Shutdown Current
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True Shutdown
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SOT-25 Package
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All AME's Lead Free Products Meet RoHS
Standards
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Applications
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Hand-held Devices
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Digital Cameras
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Portable Applications
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MP3 Players
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LCD Bias Power
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Wireless Handsets
Rev. A.02
1
AME [ ANALOG MICROELECTRONICS ]
