AME, Inc.
AME5140
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General Description
The AME5140 switching regulator is current-mode boost
converters operating at fixed frequency of 1.6 MHz.
The use of SOT-25/TSOT-25, DFN-8(3mmx3mmx
0.75mm) & MSOP-8 packages, made possible by the
minimal power loss of the internal 1.8A switch, and use
of small inductor and capacitors result in the industry's
highest power density. The 30V internal switch makes
these solutions perfect for boosting to voltages up to 30V.
These parts have a logic-level shutdown pin that can
be used to reduce quiescent current and extend battery
life. Protection is provided through cycle-by-cycle cur-
rent limiting and thermal shutdown. Internal compensa-
tion simplifies and reduces component count.
1.6 MHz Boost Converter With
30V Internal FET Switch
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Typical Application
L/6.8µH
D1
IN
R3
51K
EN
GND
C1
4.7µF
GND
R2
13.3K
CF
680pF
C2
22µF
SW
V
OUT
5V
800mA
R1
43K
V
IN
4.2V
AME5140
FB
EN
Figure 1. 4.2V to 5V Boost Converter
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Features
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30V DMOS FET Switch
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1.6 MHz Switching Frequency
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Low R
DSON
DMOS FET
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Switch Current Up to 1.8A
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Wide Input Voltage Range (2.7V-5.5V)
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Low Shutdown Current (<1µA)
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SOT-25/TSOT-25, DFN-8(3mmx3mmx0.75mm) &
MSOP-8 Packages
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Uses Tiny Capacitors and Inductor
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Cycle-by-Cycle Current Limiting
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All AME's Lead Free Products Meet RoHS
Standards
GND
C1
4.7µF
5V
EN
R3
51K
EN
V
IN
IN
L/10µH
D1
SW
V
OUT
12V
400mA
FB
GND
R2
13.3K
CF
220pF
C2
4.7µF
R1
117K
AME5140
Figure 2. 5V to 12V Boost Converter
L/10µH
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Applications
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White LED Current Source
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PDA's and Palm-Top Computers
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Digital Cameras
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Portable Phones and Games
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Local Boost Regulator
V
IN
IN
5V
EN
R3
51K
EN
GND
C1
4.7µF
GND
R2
13.3K
SW
D1
V
OUT
18V
250mA
AME5140
FB
R1
183K
CF
160pF
C2
4.7µF
Figure 3. 5V to 18V Boost Converter
Rev.G.01
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AME [ ANALOG MICROELECTRONICS ]
