EV1531DQ-002A
Low Power, Triple Output Step-Up
Plus Charge Pump for TFT Bias
Monolithic Power Systems
EVALUATION BOARD – INITIAL RELEASE
GENERAL DESCRIPTION
The EV1531DQ-002A Evaluation Board is
designed to demonstrate the capabilities of
MPS’ MP1531 triple output step-up converter
with charge-pumps.
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.
FEATURES
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2.7V to 5.5V Operating Input Range
500mA Switch Current Limit
3 Outputs in Single Package
•
Step-Up Converter up to 22V
•
Positive 10mA Linear Regulator
•
Negative 10mA Linear Regulator
250mΩ Internal Power MOSFET Switch
Up to 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
TFT LCD Displays
Portable DVD Players
Tablet PCs
Car Navigation Displays
ELECTRICAL SPECIFICATION
Parameter
Symbol Value Units
Input Voltage
V
IN
2.7-5.5
V
Main Output Voltage
V
MAIN
5
V
Main Output Current
I
MAIN
100
mA
(+) Charge Pump Voltage
V
GH
15
V
(+) Charge Pump Current
I
GH
5
mA
(–) Charge Pump Voltage
V
GL
–10
V
(–) Charge Pump Current
I
GL
5
mA
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APPLICATIONS
, “MPS”, “Monolithic Power Systems”, and “The Future of Analog IC
Technology” are Registered Trademarks of Monolithic Power Systems, Inc.
EV1531DQ-002A EVALUATION BOARD
Efficiency vs Load Current
Delivered by Step-Up Converter
100
90
V
IN
= 4.2V
V
IN
= 3.3V
EFFICIENCY (%)
80
70
60
50
40
30
20
0
Dimensions (2.34”X x 2.25”Y x 0.50”Z)
Board Number
EV1531DQ-002A
10/04, Rev. 1.1
MPS IC Number
MP1531
V
MAIN
= 5V
100 200 300 400 500 600
LOAD CURRENT (mA)
MP1531-EC01
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