MP1523
Precision 6-Lamp
White LED Driver
INITIAL RELEASE
07/04, Rev. 1.6 www.MonolithicPo wer.com 1
Monolithic Power Systems
DESCRIPTION
The MP1523 is a 5-pin SOT23 step-up
converter designed for driving up to six (6)
series white LEDs from a single-cell Lithium
Ion battery. The MP1523 uses a current
limited, variable frequency architecture to
regulate the LED current, which is measured
through an external current sense resistor. Its
low 0.4V feedback threshold reduces power
loss and improves efficiency. To prevent
damage due to an open circuit condition, the
BIAS pin can measure the output voltage and
turn off the converter if an over-voltage
condition is present.
The MP1523 includes under-voltage lockout,
current limiting, and thermal overload
protection to prevent damage in the event of
an output overload. The MP1523 is available in
a small 5-pin SOT23 package.
FEATURES
• On Board Power MOSFET
• Drives up to 6 White LEDs
• Up to 90% Efficiency
• Over 80mA Output Current Capacity
• Open Load Shutdown
• Low 0.4V Feedback Threshold
• UVLO, Thermal Shutdown
• Soft-Start
• Internal Current Limiter
• Available in SOT23-5 Package
• Evaluation Board Available
APPLICATIONS
• Cell Phones
• Handheld Computers and PDAs
• Digital Still and Video Cameras
• Small LCD Displays
, “MPS”, “Monolithic Power Systems”, and “The Future of Analog IC
Technology” are Registered Trademarks of Monolithic Power Systems, Inc.
TYPICAL APPLICATION
MP1523
BIAS SW
FBGND
EN
23
15
4
V
IN
2.7V to 5.5V
A
Up To
6 LEDs
B
EN
MP1523-TAC-S01
100
90
80
70
60
50
EFFICIENCY (%)
5 10152025
LED CURRENT (mA)
MP1523-EC01
V
IN
= 5V
V
IN
= 4V
V
IN
= 3V
