MPS EV20045DQ-00A Manuel utilisateur

EV20045DQ-00A

Low Noise, High PSRR, 1A

Linear Regulator EV Board

EV20045DQ-00A Rev. 1.0 www.MonolithicPower.com 1

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DESCRIPTION

The EV20045DQ-00A evaluation board

demonstrates the performance of MP20045, a

low noise, low dropout and high PSRR linear

regulator. It operates from a 2.5V to 5.5V input

voltage and the output voltage can be set

externally which ranges from 1.5V to 5V.

The EV20045DQ-00A can supply up to 1A of

load current, and features current limiting, over

temperature protection and power-good status.

An internal PMOS pass element is used to

allow a low 110uA ground current, marking the

MP20045 suitable for battery-power devices.

ELECTRICAL SPECIFICATIONS

Parameter

Symbol

Value

Units

Input Voltage

VIN

3.5 –5.5

Output Voltage

VOUT

Load Current

IOUT

FEATURES

Up to 1A Output Current

Low 140mV Dropout at 1A

Adjustable Output

56dB PSRR at 1kHz

13μVRMS Low Noise Output

Open Drain Power-Good Status Output

Very Fast Transient Responses

Current Limit and Thermal Protection

APPLICATIONS

Notebook Computers

Cordless Telephones

Cellular Phones

Modems

Hand-Held Instruments

PDA and Palmtop Computers

MPS” and “The Future of Analog IC Technology” are Registered Trademarks of

Monolithic PowerSystems, Inc.

EV20045DQ-00A EVALUATION BOARD

(L x W x H) 2.5” x 2.5” x 0.4”

(6.35cm x 6.35cm x 1.1cm)

Board Number

MPS IC Number

EV20045DQ-00A

MP20045DQ

EV20045DQ-00A –LOWNOISE, HIGHPSRR,1ALINEREGULATOR

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EVALUATION BOARD SCHEMATIC

EV20045DQ-00A BILL OF MATERIALS

Qty

Ref

Value

Description

Package

Manufacturer

Part Number

C1,C2

2.2uF

Ceramic

Capacitor,X7R,16V

0805

TDK

C2012X7R1C225K

100pF

Ceramic

Capacitor,COG,50V

0603

TDK

C1608COG1H101J

CIN,COUT

R1,R2

10kΩ

Film Res, 1%

0603

Yageo

RC0603FR-0710KL

R3,R4

100kΩ

Film Res, 5%

0603

Any

LDO Regulator

QFN8

(3mm*3mm)

MPS

MP20045DQ

EV20045DQ-00A –LOWNOISE, HIGHPSRR,1ALINEREGULATOR

EV20045DQ-00A Rev. 1.0 www.MonolithicPower.com 3

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PRINTED CIRCUIT BOARD LAYOUT

Figure 1—Top Layer

Figure 2—Bottom Layer

Figure 3—Top Silk Layer

EV20045DQ-00A –LOWNOISE, HIGHPSRR,1ALINEREGULATOR

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QUICK START GUIDE (ADJUSTABLE OUTPUT)

The output voltage of this board is set externally which ranges from 1.5V to 5V by operating from +2.5V

to +5.5V input as the figure 4. The default output voltage of this board is set to 3.0V.

The board layout accommodates most commonly used resistors and capacitors.

1. Attach the positive and negative ends of the load to the VOUT and GND pins, respectively.

2. Attach the Input Voltage (3.5V ≤VIN ≤5.5V) and Input Ground to the VIN and GND pins,

respectively.

3. To enable the MP20045 apply a voltage, 1.5V ≤VEN ≤5.5V, to the EN pin. To disable the

MP20045 apply a voltage, VEN < 0.4V, to the EN pin. The EN pin can be connected to VIN with a

100kΩresistor for automatic startup.

4. The Output Voltage VOUT can be changed by varying R2. Calculate the new value by formula:

(

OUT 



Where VFB = 1.5V and R1 = 10kΩ.

Example:

For VOUT = 3.0V:

10kΩ

1.5

3.0

(

10kΩ

R2 





Therefore, use a 10kΩ standard 1% value.

Figure 4—Adjust Version

Figure 5—Fixed Version

EV20045DQ-00A –LOWNOISE, HIGHPSRR,1ALINEREGULATOR

NOTICE: The information in this document is subject to change without notice. Please contact MPS for current specifications.

Users should warrant and guarantee that third party Intellectual Property rights are not infringed upon when integrating MPS

products into any application. MPS will not assume any legal responsibility for any said applications.

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QUICK START GUIDE (MODIFICATION FOR FIXED OUTPUT)

For modifying the EV20045DQ-00A to accommodate a fixed output voltage version of the MP20045 as

the figure 5:

1. Carefully remove the IC(U1) and replace it with the corresponding fixed output version of the

MP20045 chip.

2. Remove both R1 and R2.

3. Short R1 while leaving R2 open.

4. Attach the positive and negative ends of the load to the VOUT and GND pins, respectively.

5. Attach the Input Voltage (3.5V ≤VIN ≤5.5V) and Input Ground to the VIN and GND pins,

respectively.

6. To enable the MP20045 apply a voltage, 1.5V ≤VEN ≤5.5V, to the EN pin. To disable the

MP20045 apply a voltage, VEN < 0.4V, to the EN pin. The EN pin can be connected to VIN with a

100kΩresistor for automatic startup.

Please refer to the datasheet for the detailed information of the different output voltage option of

MP20045.

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