MP3021 Datasheet, PDF (1/10 Pages) Monolithic Power Systems – 1x, 1.5x, 2x Auto-Adjust Charge Pump White LED Backlight Driver

The Future of Analog IC Technology
MP3021
1x, 1.5x, 2x Auto-Adjust Charge Pump
White LED Backlight Driver
DESCRIPTION
The MP3021 is a WLED driver that can drive up
to 4 backlight WLEDs at up to 30mA each.
Backlight brightness is adjusted using a 5-bit
register plus one bit for precise low brightness
control.
The MP3021 employs a super efficient
inductorless charge pump with 1x, 1.5x and 2x
automatic mode control to achieve high
efficiency power conversions.
Monolithic Power System’s single wire MPC^TM
serial data link provides a simple and fast
interface used to enable, disable and set
current levels for each LED. In addition,
soft-start limits the inrush current during startup
and mode switching.
Each output is current limited, providing
controlled brightness and short circuit protection.
Thermal shutdown protection guards against
excessive temperatures due to circuit loads and
shorts.
The tiny 3mm x 3mm QFN 16-pin package and
small external capacitors deliver the most
compact white LED solution available.
FEATURES
• Backlight: up to 4 WLEDs at 30mA Each
• Single Wire Serial Bus (MPC^TM Serial Data Link)
Simple, Low Overhead Solution
Fast Data Transfer Rate
• Good Current Matching at Low LED Current
• Thermal Shutdown Protection
• Under-Voltage Protection
• Available in a 3mm x 3mm 16-Pin QFN Package
• Low EMI Noise
APPLICATIONS
• Cellular Phones
• PDA Phones
• PDAs
• Other Small Portable Displays
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
“MPC” is a Trademark of Monolithic Power Systems, Inc.
TYPICAL APPLICATION
BATT
SINGLE PIN SERIAL PORT
7
VIN
4
C1A
3
C1B
6
C2A
2
C2B
8
DATA
11
ISET
5
VSS
MP3021
D1 D2 D3 D4
LED0
LED1
LED2
LED3
16
15
14
13
120mA Total Backlight
1
CP
COMMON ANODE
CONFIGURATION
Efficiency vs
Battery Voltage
100
I_LED=10mA
90
80
70
60
50 ^I_LED=20mA
I_LED=30mA
40
30
20
2.5 3.0 3.5 4.0 4.5
BATTERY VOLTAGE (V)
MP3021 Rev. 1.0
www.MonolithicPower.com
1
11/21/2007
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© 2007 MPS. All Rights Reserved.