AME5130_1 Datasheet, PDF (1/16 Pages) Analog Microelectronics – Micropower Step-Up DC/DC Converter

AME
AME5130
Micropower Step-Up
DC/DC Converter
n General Description
The AME5130 is a fixed off-time step-up DC/DC con-
verter in a small 5-lead SOT-25 package.The AME5130
is ideal for LCD panels requiring low current and high effi-
ciency as well as LED applications for cellular phone back-
lighting, PDAS,and other hand-held devices. The low
400ns off-time allows the use of tiny external compo-
nents.
AME5130 can drive up 8 white LEDs from a single Li-
Ion battery DC 2V to 5.5V; can be turned on by putting
more than 1V at pin 4(EN). To control LED brightness,
the LED current can be pulsed by applying a PWM (pulse
width modulated) signal with a frequency range of 100Hz
to 50KHz to the EN pin.
n Typical Application
V _IN
2.5V-4.2V
C_IN
4.7µF
Ceramic
L
10µH
D
5
V _IN
1
SW
AME5130
Option for
6LEDs
I_LED
C_OUT
4.7µ F
Ceramic
>1.1V ₄
3
EN
GND
FB
0V
R2
80Ω
2
n Features
l 0.7Ω internal switch
l Uses small surface mount components
l Adjustable output voltage up to 20V
l 2V to 5.5V input range
l Input undervoltage lockout
l 0.01µA shutdown current
l Small 5-Lead SOT-25 package
l All AME’ s Lead Free Product Meet RoHS
Standard
n Applications
l White LED Back-Lighting
l Hand-held Devices
l Digital Cameras
l Portable Applications
l LCD Bias Power
* I_LED=V_FB/R2
Figure 1 Six White LEDs Application in Li-lon
Battery
V _IN
2.5V-4.2V
L
15µ H
D
C_IN
4.7µF
Ceramic
5
V_IN
1
SW
AME5130 _FB ³
4
EN
GND
2
20V
20mA
R1
200K
R2
13K
C_OUT
4.7µ F
Ceramic
Figure 2 Typical 20V Application
Rev.F.02
1