EV3366-C-00A
6 Strings Boost White LED Driver
Evaluation Board
EV3366-C-00A Rev.1.1 www.MonolithicPower.com 1
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© 2016 MPS. All Rights Reserved.
The Future of Analog IC Technology
DESCRIPTION
The MP3366 is a step-up converter with 6-
channel current sources. It is designed for
driving the white LED arrays as backlighting of
mid- or larger- sized LCD panel.
The MP3366 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 MP3366
independently regulates the current in each
LED string to the value set by an external
current-setting resistor.
The MP3366 applies 6 internal current sources
in each LED string terminal to achieve a current
balance with 1.5% current regulation accuracy
between strings. Its low 500mV regulation
voltage on LED current sources reduces power
loss.
The MP3366 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,
MP3366 automatically transfers the PWM input
signal 100Hz to 20kHz frequency to 23.5kHz to
29.5kHz to eliminate the audible noise.
MP3366 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 MP3366 is available in CSP-
18(1.35mmX2.55mm) package.
ELECTRICAL SPECIFICATIONS
Parameter Symbol Value Units
Input Voltage V
IN
3 – 25 V
Output Voltage VLED <50 V
LEDs # 6 string
LED Current I
LED
20/string mA
FEATURES
6-String, Max 45mA/String
3V to 25V Input Voltage Range
1.5% Current Matching Accuracy Between
Strings
600kHz Switching Frequency
Combined Analog and PWM Dimming Mode
with 25% Dimming Transfer Point
23.5kHz to 29.5kHz Output Dimming
Frequency to eliminate audible noise
Programmable Over-Voltage Protection
Recoverable Thermal Shutdown Protection
Cycle by Cycle Over Current Protection
Under-Voltage Lockout
Available in a WLCSP-18(1.35X2.55mm)
Package
APPLICATIONS
Tablets
NBs
Handy Terminals Display
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Monolithic Power Systems, Inc.
