AMS1072
DESCRIPTION
The
AMS1072
is a step-up converter designed for
driving up to 39 white LEDs (13 strings of 3 LEDs
each) from a 5V system rail. The
AMS1072
uses a
current mode, fixed frequency architecture to
regulate the LED current, which is measured
through an external current sense resistor. Its low
104mV feedback voltage reduces power loss and
improves efficiency. The OV pin monitors the
output voltage and turns off the converter if an
over-voltage condition is present due to an open
circuit condition.
FEATURES
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2.5V to
8V
Input Voltage Range
On Board Power MOSFET
Drives up to 39 White LEDs at 5V Input
Up to 92% Efficiency
1.3MHz Fixed Switching Frequency
Open Load Shutdown
Low 104mV Feedback Voltage
Soft-Start/PWM Dimming
UVLO, Thermal Shutdown
Internal 1.3A Current Limit
Available in SOT23-6 Packages
Cell Phones
Handheld Computers and PDAs
Digital Still Cameras
Small LCD Displays
The
AMS1072
includes under-voltage lockout,
current limiting and thermal overload protection
preventing damage in the event of an output
overload.
The
AMS1072
is available in small 6-pin SOT23-6
packages.
APPLICATIONS
TYPICAL APPLICATION
V
IN
4V - 6V
13 Strings
IN
SW
EN
EN
AMS1072
OV
FB
GND
1
Advanced Monolithic Systems
http://www.ams-semitech.com
AMS [ Advanced Monolithic Systems Ltd ]
