EV1531DQ-002A
Low Power, Triple Output Step-Up
Plus Charge Pump for TFT Bias
EVALUATION BOARD – INITIAL RELEASE
10/04, Rev. 1.1 www.MonolithicPo wer.com 1
Monolithic Power Systems
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.
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
FEATURES
• 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
APPLICATIONS
• TFT LCD Displays
• Portable DVD Players
• Tablet PCs
• Car Navigation Displays
, “MPS”, “Monolithic Power Systems”, and “The Future of Analog IC
Technology” are Registered Trademarks of Monolithic Power Systems, Inc.
EV1531DQ-002A EVALUATION BOARD
Dimensions (2.34”X x 2.25”Y x 0.50”Z)
Board Number MPS IC Number
EV1531DQ-002A MP1531
100
90
80
70
60
50
40
30
20
EFFICIENCY (%)
0 100 200 300 400 500 600
LOAD CURRENT (mA)
MP1531-EC01
Efficiency vs Load Current
Delivered by Step-Up Converter
V
IN
= 3.3V
V
MAIN
= 5V
V
IN
= 4.2V
