EV1531DQ-002A

Low Power, Triple Output Step-Up

Plus Charge Pump for TFT Bias

EVALUATION BOARD – INITIAL RELEASE

10/04, Rev. 1.1

www.MonolithicPower.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

2.7-5.5

V

Main Output Voltage

5

V

Main Output Current

100

mA

(+) Charge Pump Voltage

15

V

(+) Charge Pump Current

5

mA

(–) Charge Pump Voltage

–10

V

(–) Charge Pump Current

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

0

100 200 300 400 500 600

LOAD CURRENT (mA)

MP1531-EC01

Efficiency vs Load Current

Delivered by Step-Up Converter