2.7V-5.5V Input, 38V Output,
FSW Programmable, White LED Driver
with I2C Interface
The MP3309C is a WLED step-up converter for
2.7V to 5.5V input that uses peak current mode
to regulate the LED current sensed through an
external low-side resistor. The 200mV feedback
voltage and synchronous rectification reduces
power loss and reduces PCB space
requirements. For non-synchronous mode,
setting an internal register can disable the
rectifier MOSFET to save driver losses.
The MP3309C features a programmable
switching frequency to optimize efficiency. It
supports both analog and PWM dimming.
In addition, the MP3309C has LED open
protection, cycle-by-cycle current limit
protection, thermal shutdown protection, and
VOUT to GND short-circuit protection. The I2C
interface can set the protection indication bits
and over-voltage protection point.
2.7V to 5.5V Input Voltage
Analog and PWM Dimming
Selectable Synchronous or Non-
400kHz I2C-Compatible Interface
Digitally Set LED Current
Programmable Switching Frequency
Programmable Open Load Protection Point
Low 200mV Feedback Voltage with ±1%
Accuracy at Room Temperature
Software Enable Function
UVLO, Thermal Shutdown
Available in a 1.4×1.8mm FCQFN10
Feature Phones and Smart Phones
<10in Video Displays
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status, please visit MPS website under Products, Quality Assurance page.
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Monolithic Power Systems, Inc.
Typical Application Circuit
MP3309C Rev. 1.0
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