AME, Inc.
AME5131
n
General Description
The AME5131 is a high-frequency boost converter dedi-
cated for LCD bias supply and white LED applications for
cellular phone backlighting, PDAs, and other hand-held
devices. The part can also be used to generate standard
3.3 V/5 V to 12 V power conversions.
The AME5131 has an internal 400mA switch current
limit, offering lower output voltage ripple. The 32µA low
quiescent current together with an optimized control
scheme, allows device operation at high efficiencies and
maintains long battery lifetime. AME5131 uses SOT-25
package and gives a small size solution.
Low Power
DC/DC Boost Converter
n
Function Block Diagram
On / Off Time
Controller
UVP
V
IN
SW
_
FB
+
Boost
Controller
Driver
Bandgap
+
_
GND
Soft Start
Enable
EN
n
Features
l
0.6Ω Internal Switch
l
1.8V to 5.5V Input Range
l
Adjustable Output Voltage Up to 28V
l
Input Under Voltage Protection
l
32µA Typical No Load Quiescent Current
l
1µA Shutdown Current
l
SOT-25 Package
l
All AME's Lead Free Products Meet RoHS
Standards
C
IN
4.7μF
4
EN
V
IN
1.8 V-5.5 V
5 V
IN
1
R1
2.1M
C
FF
22PF
n
Typical Application
L1
10μH
D1
V
OUT
V
IN
~28 V
SW
AME5131
FB
GND
3
2
R2
150K
C
O
1μF
n
Applications
l
White LED Back-Lighting
l
Hand-held Devices
l
Digital Cameras
l
Portable Applications
l
Internet Audio Player
l
LCD Bias Power
l
Standard 3.3 V/5 V to 12 V Conversions
1
AME [ ANALOG MICROELECTRONICS ]
