MP1531
Low Power, Triple Output Step-Up
Plus Charge Pump for TFT Bias
The Future of Analog IC Technology
DESCRIPTION
The MP1531 is a triple output step-up converter
with charge-pumps to make a complete DC/DC
converter to power a TFT LCD panel from a
2.7V to 5.5V supply.
The MP1531 includes a 250KHz fixed frequency
step-up converter and a positive and negative
linear regulator. The linear regulators are
powered via charge-pumps driven by the step-up
converter switch node.
A single on/off control enables all 3 outputs.
The outputs are internally sequenced at
power-on for ease of use. An internal soft-start
prevents overloading the input source at
startup. Cycle-by-cycle current limit reduces
component stress.
The MP1531 is available in both a tiny 16-pin
QFN package (3mm x 3mm) and a 16-pin
TSSOP package.
FEATURES
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2.7V to 5.5V Operating Input Range
500mA Switch Current Limit
3 Outputs in a Single Package
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Step-Up Converter up to 22V
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Positive 10mA Linear Regulator
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Negative 10mA Linear Regulator
250mΩ Internal Power MOSFET Switch
95% Efficiency
1µA Shutdown Mode
Fixed 250KHz Frequency
Positive Regulator up to 38V
Negative Regulator down to -20V
Internal Power-On Sequencing
Adjustable Soft-Start/Fault Timer
Thermal Shutdown
Cycle-By-Cycle Over Current Protection
Under Voltage Lockout
Ready Flag
16-Pin TSSOP and QFN (3mm x 3mm) Packages
TFT LCD Displays
Portable DVD Players
Tablet PCs
Car Navigation Displays
EVALUATION BOARD REFERENCE
Board Number
EV1531DQ-002A
Dimensions
2.3”X x 2.3”Y x 0.5”Z
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APPLICATIONS
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
V
IN
2.7V-4.2V
Efficiency vs
Load Current
100
90
V
IN
= 4.2V
V
IN
= 3.3V
EFFICIENCY (%)
OFF ON
TO
SW
EN CT RDY IN
SW
COMP
FB1
V
MAIN
5V
80
70
60
50
40
30
20
0
IN2
MP1531
V
GL
-4V
IN3
GL
FB2
REF
GND
GH
FB3
PGND
V
GH
12V
V
MAIN
= 5V
100 200 300 400 500 600
LOAD CURRENT (mA)
MP1531 Rev. 1.2
5/22/2006
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
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