AME5145 Datasheet, PDF (1/23 Pages) Analog Microelectronics – 1.6 MHz Boost Converter With

AME
AME5145
n 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
n Typical Application
L/6.8µH
V_IN
4.2V
EN
IN
SW
R3
51K
AME5145
EN
FB
GND
D1
VOUT
5V
800mA
R1
43K
C1
4.7µF
GND
R2
13.3K
CF
680pF
C2
22µF
Figure 1. 4.2V to 5V Boost Converter
n Features
l 30V DMOS FET Switch
l 1.6 MHz Switching Frequency
l Low R_DSON DMOS FET
l Switch Current Up to 1.8A
l Wide Input Voltage Range (2.7V-5.5V)
l Low Shutdown Current (<1µA)
l SOT-25/TSOT-25, DFN-8C & MSOP-8 Packages
l Uses Tiny Capacitors and Inductor
l Cycle-by-Cycle Current Limiting
l All AME's Lead Free Products Meet RoHS
Standards
L/10µH
V_IN
D1
VOUT
IN
SW
5V
12V
R3
51K
AME5145
EN
R1
117K
400mA
EN
FB
GND
C1
4.7µF
GND
R2
13.3K
CF
220pF
C2
4.7µF
Figure 2. 5V to 12V Boost Converter
n Applications
l White LED Current Source
l PDA's and Palm-Top Computers
l Digital Cameras
l Portable Phones and Games
l Local Boost Regulator
Rev.B.01
L/10µH
V _IN
5V
EN
GND
IN
SW
R3
51K
AME5145
EN
FB
GND
C1
4.7µF
R2
13.3K
D1
R1
183K
CF
160pF
VOUT
18V
250mA
C2
4.7µF
Figure 3. 5V to 18V Boost Converter
1