MP3309C
2.7V-5.5V Input, 38V Output,
FSW Programmable, White LED Driver
with I2C Interface
DESCRIPTION
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.
FEATURES
2.7V to 5.5V Input Voltage
Analog and PWM Dimming
Selectable Synchronous or Non-
synchronous Mode
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
Package
APPLICATIONS
Feature Phones and Smart Phones
Tablets
<10in Video Displays
All MPS parts are lead-free and adhere to the RoHS directive. For MPS green
status, please visit MPS website under Products, Quality Assurance page.
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
VIN
C1
GND
SCL
SDA
EN/PWML
R2
L1
C2
SW BST
C3
IN
VOUT
MP3309C
SDA
SCL
PWM
FREQ
FB
R1
GND
Typical Application Circuit
MP3309C Rev. 1.0
www.MonolithicPower.com
1
2/26/2019
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
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