MP1531DQ-LF-P Datasheet, PDF (1/14 Pages) MPS Industries, Inc. – Low Power, Triple Output Step-Up Plus Charge Pump for TFT Bias

The Future of Analog IC Technology
MP1531
Low Power, Triple Output Step-Up
Plus Charge Pump for TFT Bias
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 (3x3mm) and a 16-pin TSSOP
package.
EVALUATION BOARD REFERENCE
Board Number
EV1531DQ-002A
Dimensions
2.3”X x 2.3”Y x 0.5”Z
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
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 (3x3mm)
Packages
APPLICATIONS
 TFT LCD Displays
 Portable DVD Players
 Tablet PCs
 Car Navigation Displays
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.
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. 1.31
www.MonolithicPower.com
1
5/25/2011
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© 2011 MPS. All Rights Reserved.