AME, Inc.
1
AME5130 Micropower Step-Up DC/DC Converter
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(RUN). 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 RUN pin.
n General Description
n Features
n Applications
n Typical Application
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 White LED Back-Lighting
l Hand-held Devices
l Digital Cameras
l Portable Applications
l LCD Bias Power
Figure 1 Six White LEDs Application in Li-lon：
Battery
Figure 2 Typical 20V Application：
CIN
4.7mF
Ceramic
2
5 1
L
15mH
4
VIN
2.5V-4.2V
3
R2
33K
D
AME5130
SWVIN
FB
GND
RUN
COUT
4.7mF
Ceramic
R1
510K
20V
20mA
CIN
4.7mF
Ceramic
AME5130
VIN SW
FBRUN GND
2
5 1
L
10mH
4
0V
>1.1V
VIN
2.5V-4.2V
3
R2
80W
COUT
4.7mF
Ceramic
D Option for
6LEDs
ILED
* ILED=VFB/R2