AME
AME5143
General Description
The AME5143 switching regulator is current-mode boost
converters operating at fixed frequency of 1.4MHz.
The use of MSOP-8/PP package, 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.
1.4MHz Boost Converter With
30V Internal FET Switch
Typical Application
V
IN
5V
L1
10µH
C3
10µF
D1
V
OUT
6V
C1
4.7µF
IN
SW
L2
10µH
R1
59K
CF
820pF
EN AME5143 SW
CS
GND
CS
FB
Rcs
Cs
C2
22µF
R2
15K
Figure 1. 5V to 6V Boost Converter
L1
4.7µH
Features
30V DMOS FET Switch
1.4MHz Switching Frequency
Low R
DSON
DMOS FET
Switch Current Up to 1.8A (CS Connects
to GND)
Wide Input Voltage Range (2.7V-5.5V)
Low Shutdown Current (<1µA)
MSOP-8/PP Package
Uses Tiny Capacitors and Inductor
Meet RoHS Standards
V
IN
3.3V
D1
IN
AME5143
EN
C1
4.7µF
GND
FB
CS
R2
10K
CF
820pF
SW
R1
30K
V
OUT
5V
750mA
C2
22µF
Figure 2. 3.3V to 5V Boost Converter
L1
10µH
V
OUT
12V
500mA
V
IN
5V
D1
IN
AME5143
EN
FB
CS
R2
13.3K
CF
220pF
SW
R1
117K
Applications
White LED Current Source
PDA's and Palm-Top Computers
Digital Cameras
Portable Phones and Games
Local Boost Regulator
C1
4.7µF
GND
C2
10µF
Figure 3. 5V to 12V Boost Converter
Rev.A.01
1
AME [ ANALOG MICROELECTRONICS ]
