MP1531 Datasheet, PDF (1/12 Pages) Monolithic Power Systems – 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.
EVALUATION BOARD REFERENCE
Board Number
Dimensions
EV1531DQ-002A
2.3”X x 2.3”Y x 0.5”Z
MP1531
Low Power, Triple Output Step-Up
Plus Charge Pump for TFT Bias
FEATURES
• 2.7V to 5.5V Operating Input Range
• 500mA Switch Current Limit
• 3 Outputs in a Single Package
• Step-Up Converter up to 22V
• Positive 10mA Linear Regulator
• 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
APPLICATIONS
• TFT LCD Displays
• Portable DVD Players
• Tablet PCs
• Car Navigation Displays
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
V_IN
2.7V-4.2V
OFF ON
TO
SW
V_GL
-4V
EN
CT
RDY
IN
SW
COMP
FB1
IN2
MP1531
IN3
GL
FB2
GH
FB3
REF
GND
PGND
V_MAIN
5V
V_GH
12V
Efficiency vs
Load Current
100
V_IN = 4.2V
90
80
V_IN = 3.3V
70
60
50
40
30
V_MAIN = 5V
20
0
100 200 300 400 500 600
LOAD CURRENT (mA)
MP1531 Rev. 1.2
www.MonolithicPower.com
1
5/22/2006
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© 2006 MPS. All Rights Reserved.