AME
AME5145
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General Description
The AME5145 switching regulator is current-mode boost
converters operating at fixed frequency of 1.6 MHz.
The use of SOT-25/TSOT-25, DFN-8C & MSOP-8 pack-
ages, made possible by the minimal power loss of the
internal 1.8A switch, and use of small inductor and ca-
pacitors 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
V
IN
IN
4.2V
EN
R3
51K
EN
GND
C1
4.7µF
GND
R2
13.3K
CF
680pF
C2
22µF
SW
D1
V
OUT
5V
800mA
R1
43K
AME5145
FB
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-8C & 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
V
IN
IN
5V
EN
R3
51K
EN
L/10µH
D1
SW
V
OUT
12V
400mA
FB
GND
CF
220pF
C2
4.7µF
R1
117K
AME5145
R2
13.3K
Figure 2. 5V to 12V Boost Converter
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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
C1
4.7µF
GND
EN
V
IN
IN
5V
R3
51K
EN
L/10µH
D1
SW
V
OUT
18V
250mA
R1
183K
AME5145
FB
GND
R2
13.3K
CF
160pF
C2
4.7µF
Figure 3. 5V to 18V Boost Converter
Rev.B.01
1
AME [ ANALOG MICROELECTRONICS ]
