AME5131 Datasheet, PDF (1/11 Pages) Analog Microelectronics – Low Power DC/DC Boost Converter

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.
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
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
Low Power
DC/DC Boost Converter
n Function Block Diagram
UVP
V_IN
On / Off Time
Controller
FB
_
+
Boost
Controller
Driver
Bandgap
Enable
EN
+
_
Soft Start
SW
GND
n Typical Application
V_IN
1.8 V-5.5 V
L1
10 H
4.C7 ^IN F
5 _VIN
SW ¹
AME5131
3
FB
4 _{EN GND} 2
D1
R1
2.1M
R2
150K
V_OUT
V_IN ~28 V
C_{F F}
22PF
1C^OF
1