MPQ3387L
Step-up, 6 strings, Max. 45mA/string, Combined Analog
and PWM dimming, White LED Driver
AEC-Q100 Qualified
The Future of Analog IC Technology
DESCRIPTION
FEATURES
The MPQ3387L 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.
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Guaranteed Industrial/Automotive
Temperature Range Limits
6-String, Max 45mA/String
3V to 25V 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
Cascading Capability with a Single Power
Source
Programmable Over-Voltage Protection
Recoverable Thermal Shutdown Protection
Cycle by Cycle Over Current Protection
Fault Indicator Signal Output(Optional)
Under-Voltage Lockout
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The MPQ3387L 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 25V input supply. The MPQ3387L
independently regulates the current in each
LED string to the value set by an external
current-setting resistor.
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The MPQ3387L 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.
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The MPQ3387L 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,
MPQ3387L automatically transfers the PWM
input signal 100Hz to 20kHz frequency to
24kHz to 27.5kHz to eliminate the audible noise.
TQFN24 (4X4mm) Package
Available in AEC-Q100 Qualified Grade 1
APPLICATIONS
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Notebook PC
Small LCD TV
Portable Terminals Display
Automotive System and Tablet Computer
MPQ3387L 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.
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.
The MPQ3387L is available in TQFN24-
4mmX4mm package.
MPQ3387L Rev. 1.01
10/8/2015
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2015 MPS. All Rights Reserved.
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