MP3386 Datasheet, PDF (1/14 Pages) Monolithic Power Systems – 50V, 6 String White LED Driver

The Future of Analog IC Technology
MP3386
50V, 6 String White LED Driver
DESCRIPTION
The MP3386 is a step-up converter with 6-
channel current sources designed for driving the
white LED arrays for large size LCD panel
backlighting applications.
The MP3386 uses current mode, fixed frequency
architecture. The switching frequency can be
selected at 1.25MHz or 625kHz. It generates an
output voltage up to 50V from a 4.5V to 25V input
supply. The MP3386 regulates the current in each
LED string to the user programmed value set by an
external current setting resistor.
The MP3386 applies 6 internal current sources in
each LED string terminal to get current balance.
And the current matching achieves 3% regulation
accuracy between strings. Its low 600mV
regulation voltage on LED current sources reduces
power loss and improves efficiency.
The MP3386 features external PWM dimming or
DC input PWM dimming, which allows the flexible
control of the backlighting luminance under wide
range of the ambient brightness, and also avoids
the possibility of PWM dimming audible noise. The
dimming PWM signal can be generated internally,
and the dimming frequency is programmed by an
external setting capacitor.
FEATURES
• High Efficiency and Small Size
• 4.5V to 25V Input Voltage Range
• 50V Maximum Step-up Voltage
• Balanced Driver for 6 Strings of WLED
• 3% Current Matching Accuracy Between
Strings
• Selectable Switching Frequency: 1.25MHz or
625kHz
• PWM or DC Input Burst PWM Dimming
• Programmable Over-voltage Protection
Threshold
• Under Voltage Lockout
• Open and Short LED Protection
• Thermal Shutdown
• Small QFN24 (4x4mm) and 28-pin SOIC
Package
APPLICATIONS
• Notebook & Netbook PC
• Small LCD TV
• Handy Terminals Display
• Automotive System and Tablet Computer
All MPS parts are lead-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.
TYPICAL APPLICATION
M1
L1
VIN
4.5V~25V
C1
D1
C2
R1
Enable
R2
C3
C4
24
23
22
21
20
19
VCC
1 _EN
VIN COMP VFAULT SW1 SW2
PGND1 ¹⁸
NC 2
OSC
17
PGND2
C5
PWM
DIMMING
3
FSET
4
C6
5
PWMO
GND
MP3386
16
OVP
VOUT ¹⁵
NC ¹⁴
6
PWMI
13
LED1
LED6
7
LED5 LED4 LED3 ISET LED2
8
9
10
11
12
RSET
MP3386 Rev. 1.0
www.MonolithicPower.com
1
1/19/2012
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.