MP3387LGRT-P Datasheet, PDF (1/14 Pages) MPS Industries, Inc. – Step-up, 6 strings, Max.45mA/string, Combined Analog and PWM dimming, White LED Driver

The Future of Analog IC Technology
MP3387L
Step-up, 6 strings, Max.45mA/string,
Combined Analog
and PWM dimming, White LED Driver
DESCRIPTION
The MP3387L is a step-up converter with 6-
channel current sources. It is designed for
driving the white LED arrays as backlighting of
middle or large size LCD panel.
The MP3387L uses peak-current mode as its
PWM control architecture. The switching
frequency can be programmed by a resistor. It
generates an output voltage up to 45V from a
3V to 26V input supply. The MP3387L
independently regulates the current in each
LED string to the value set by an external
current-setting resistor.
The MP3387L applies 6 internal current
sources in each LED string terminal to achieve
a current balance with 3% current regulation
accuracy between strings. Its low 500mV
regulation voltage on LED current sources
reduces power loss.
The MP3387L features external digital PWM
dimming and analog dimming, both of which
sharing a single input with 25% PWM duty cycle
as a transfer point. The mix-dimming strategy
helps to improve the dimming ratio. Also,
MP3387L automatically transfers the PWM
input signal 100Hz to 20kHz frequency to
24kHz to 27.5kHz to eliminate the audible noise.
MP3387L has rich protection modes to
guarantee safety operation. The protection
modes include recoverable OCP (over-current
protection), OVP (over-voltage protection), OTP
(over-temperature protection), any string of LED
short and open protection.
The MP3387L is available in TQFN24-
4mmX4mm package.
FEATURES
• 6-String, Max 45mA/String
• 3V to 26V Input Voltage Range
• 3% Current Matching Accuracy Between
Strings
• Programmable Switching Frequency
• Selectable Combined Analog and PWM
Dimming Mode or Pure PWM Dimming
Mode
• Combined Analog and PWM Dimming Mode
with 25% Dimming Transfer Point
• 24kHz to 27.5kHz Output Dimming
Frequency to eliminate audible noise
• Programmable Over-Voltage Protection
• Recoverable Thermal Shutdown Protection
• Cycle by Cycle Over Current Protection
• Under-Voltage Lockout
• TQFN24 (4X4mm) Package
APPLICATIONS
• Notebook PC
• Small LCD TV
• Handy Terminals Display
• Automotive System and Tablet Computer
All MPS parts are lead-free, halogen free, and adhere to the RoHS directive. For
MPS green status, please visit MPS website under Quality Assurance.
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks
of Monolithic Power Systems, Inc.
MP3387L Rev. 1.11
www.MonolithicPower.com
1
3/29/2016
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