Analog Devices ADP151 Manual de usuario

Evaluation Board User Guide

UG-116

One Technology Way •P. O. Box 9106 •Norwood, MA 02062-9106, U.S.A. •Tel: 781.329.4700 •Fax: 781.461.3113 •www.analog.com

Setting Up the Evaluation Board for the ADP151

PLEASE SEE THE LAST PAGE FOR AN IMPORTANT

WARNING AND LEGAL TERMS AND CONDITIONS. Rev. A | Page 1 of 12

FEATURES

Input voltage range: 2.2 V to 5.5 V

Output current range: 0 mA to 200 mA

Output voltage accuracy: ±1%

Operating temperature range: −40°C to +125°C

GENERAL DESCRIPTION

The ADP151 evaluation board is used to demonstrate the

functionality of the ADP151 series of linear regulators.

Simple device measurements such as line and load regulation,

dropout voltage, and ground current can be demonstrated with

only a single voltage supply, a voltmeter, a current meter, and

load resistors.

For more information about the ADP151 linear regulator, see

the ADP151 data sheet.

EVALUATION BOARDS

08933-001

Figure 1. TSOT PCB Layout

08933-002

Figure 2. WLCSP PCB Layout

08933-013

Figure 3. LFCSP PCB Layout

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UG-116 Evaluation Board User Guide

Rev. A | Page 2 of 12

TABLE OF CONTENTS

Features .............................................................................................. 1

General Description ......................................................................... 1

Evaluation Boards............................................................................. 1

Revision History ............................................................................... 2

Evaluation Board Hardware............................................................ 3

Evaluation Board Configurations .............................................. 3

Measuring Output Voltage ...............................................................4

Line Regulation Measurements...................................................5

Load Regulation Measurements..................................................5

Dropout Voltage Measurements..................................................6

Measuring Ground Current.............................................................7

Ground Current Consumption ...................................................8

Bill of Materials..................................................................................9

REVISION HISTORY

12/10—Rev. 0 to Rev. A

Added LFCSP Throughout................................................Universal

Added Figure 3; Renumbered Sequentially .................................. 1

Added Figure 6.................................................................................. 3

Added Figure 9.................................................................................. 5

Added Figure 15................................................................................ 8

4/10—Revision 0: Initial Version

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Evaluation Board User Guide UG-116

Rev. A | Page 3 of 12

EVALUATION BOARD HARDWARE

EVALUATION BOARD CONFIGURATIONS

The ADP151 evaluation board is supplied with different

components, depending on the version ordered. Components

common to all versions are C1, C2, and J1. Figure 4 and

Figure 5 show the schematics of these evaluation board

configurations. Table 1 describes the components.

OUT

VIN U1

GND

VOUT

1µF C2

1µF

ADP151

08933-003

Figure 4. Evaluation Board Schematic, TSOT

VIN VOUT

EN GND

VOUT

VIN

ADP151

08933-004

1µF C2

1µF

Figure 5. Evaluation Board Schematic, WLCSP

08933-014

ADP151

TOP VIEW

(Not to Scale)

OUT

VOUTVIN 1

GND

NC = NO CONNECT.

DO NOT CONNECT TO THIS PIN.

Figure 6. Evaluation Board Schematic, LFCSP

Table 1. Evaluation Board Hardware Components

Component Description

U11ADP151 ultralow noise, low dropout linear

regulator

C12Input bypass capacitor, 1 μF, 0402 size

C22Output capacitor, 1 μF, 0402 size

J1 Jumper (connects EN to VIN for automatic

startup)

1The evaluation board with the WLCSP package is the ADP151CB-xxx-EVALZ.

The evaluation board with the TSOT package is the. ADP151UJ-xxx-EVALZ.

2The ADP151 evaluation board requires only one input bypass capacitor and

one output capacitor for stable operation.

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UG-116 Evaluation Board User Guide

Rev. A | Page 4 of 12

MEASURING OUTPUT VOLTAGE

VOLTAGE SOURCE

–

VOLTMETER

LOAD

1.99711

+–

8933-005

Figure 7. Output Voltage Measurement Setup, TSOT

VOLTMETER

1.99711

–

VOLTAGE SOURCE

+–

LOAD

08933-006

Figure 8. Output Voltage Measurement Setup, WLCSP

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Evaluation Board User Guide UG-116

Rev. A | Page 5 of 12

08933-015

VOLTMETER

1.99711

+–

VOLTAGE SOURCE

LOAD

+–

Figure 9. Output Voltage Measurement Setup, LFCSP

This measurement can be repeated under different load

conditions. Figure 10 shows the typical line regulation

performance of an ADP151 with a 2.8 V output.

Figure 7 and Figure 8 show how the evaluation board can be

connected to a voltage source and a voltmeter for basic output

voltage accuracy measurements. A resistor can be used as the

load for the regulator. Ensure that the resistor has a power

rating that is adequate to handle the power that is expected to

be dissipated across it. An electronic load can also be used as

an alternative. Ensure that the voltage source can supply enough

current for the expected load levels.

2.77

2.78

2.79

2.80

2.81

2.82

2.83

3.10 3.50 3.90 4.30 4.70 5.10 5.50

OUT

(V)

LOAD = 10µA

LOAD = 100µA

LOAD = 1mA

LOAD = 10mA

LOAD = 100mA

LOAD = 200mA

08933-007

Use the following steps to connect to a voltage source and

voltmeter:

1. Connect the negative terminal (−) of the voltage source to

one of the GND pads on the evaluation board.

2. Connect the positive terminal (+) of the voltage source to

the VIN pad of the evaluation board.

3. Connect a load between the VOUT pad and one of the

GND pads.

4. Connect the negative terminal (−) of the voltmeter to one

of the GND pads. Figure 10. Output Voltage (VOUT) vs. Input Voltage (VIN) at TA= 25°C

5. Connect the positive terminal (+) of the voltmeter to the

VOUT pad. LOAD REGULATION MEASUREMENTS

For load regulation measurements, the output of the regulator

is monitored while the load is varied. For good load regulation,

the output must change as little as possible with varying load.

The input voltage must be held constant during this measure-

ment. The load current can be varied from 0 mA to 200 mA.

Figure 11 shows the typical load regulation performance of an

ADP151 with a 2.8 V output for an input voltage of 3.2 V.

When these steps are completed, the voltage source can be

turned on. If J1 is inserted (connecting EN to VIN for auto-

matic startup), the regulator powers up.

If the load current is large, the user must connect the voltmeter

as close as possible to the output capacitor to reduce the effects

of IR drops.

LINE REGULATION MEASUREMENTS

For line regulation measurements, the output of the regulator

is monitored while its input is varied. For good line regulation,

the output must change as little as possible with varying input

levels. To ensure that the device is not in dropout mode during

this measurement, VIN must be varied between VOUT nominal +

0.4 V (or 2.2 V, whichever is greater) and VIN maximum. For

example, for an ADP151 with a 2.8 V output, VIN needs to be

varied between 3.2 V and 5.5 V.

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UG-116 Evaluation Board User Guide

Rev. A | Page 6 of 12

0.01 0.1 1 10 100 1000

LOAD

(mA)

2.77

2.78

2.79

2.80

2.81

2.82

2.83

OUT

(V)

08933-008

Figure 11. Output Voltage, VOUT vs. Load Current, IOUT at VIN = 3.2 V,

VOUT = 2.8 V, TA= 25°C

DROPOUT VOLTAGE MEASUREMENTS

Dropout voltage can be measured using the configurations

shown in Figure 7 and Figure 8. Dropout voltage is defined as

the input-to-output voltage differential when the input voltage

is set to the nominal output voltage. This applies only to output

voltages above 2.2 V. Dropout voltage increases with larger loads.

For more accurate measurements, a second voltmeter can be

used to monitor the input voltage across the input capacitor.

The input supply voltage may need to be adjusted to account

for IR drops, especially if large load currents are used. Figure 12

shows the typical curve of dropout voltage measurements with

different load currents.

100

120

1 10 100 1000

VDROPOUT (mV)

ILOAD (mA)

08933-009

Figure 12. Dropout Voltage vs. Load Currents (ILOAD)

VOUT = 2.8 V, TA= 25°C

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Evaluation Board User Guide UG-116

Rev. A | Page 7 of 12

MEASURING GROUND CURRENT

VOLTAGE SOURCE

–

AMMETER

LOAD

1.99711

+–

8933-010

Figure 13. Ground Current Measurement Setup, TSOT

LOAD

VOLTAGE SOURCE

–

AMMETER

0.00112

+–

08933-011

Figure 14. Ground Current Measurement Setup, WLCSP

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UG-116 Evaluation Board User Guide

Rev. A | Page 8 of 12

LOAD

VOLTAGE SOURCE

–

–+

AMMETER

0.00112

8933-016

Figure 15. Ground Current Measurement Setup, LFCSP

GROUND CURRENT CONSUMPTION

Figure 13 and Figure 14 show how the evaluation board can be

connected to a voltage source and an ammeter for ground current

measurements. A resistor can be used as the load for the regulator.

Ensure that the resistor has a power rating that is adequate to

handle the power expected to be dissipated across it. An electronic

load can be used as an alternative. Ensure that the voltage source

can supply enough current for the expected load levels.

Ground current measurements can determine how much current

the internal circuits of the regulator consume while the circuits

perform the regulation function. To be efficient, the regulator

must consume as little current as possible. Typically, the regulator

uses the maximum current when supplying its largest load level

(200 mA). Figure 16 shows the typical ground current consump-

tion for various load levels at VOUT = 2.8 V and TA= 25°C.

Use the following steps to connect to a voltage source and

ammeter: When the device is disabled (EN = GND), ground current

drops to less than 1 μA.

1. Connect the positive terminal (+) of the voltage source to

the VIN pad on the evaluation board.

100

1000

3.10 3.50 3.90 4.30 4.70 5.10 5.50

GROUND CURRENT (µA)

(V)

LOAD = 10µA

LOAD = 100µA

LOAD = 1mA

LOAD = 10mA

LOAD = 100mA

LOAD = 200mA

08933-012

2. Connect the positive terminal (+) of the ammeter to one of

the GND pads of the evaluation board.

3. Connect the negative terminal (−) of the ammeter to the

negative (−) terminal of the voltage source.

4. Connect a load between the VOUT pad of the evaluation

board and the negative (−) terminal of the voltage source.

When these connection steps are completed, the voltage source

can be turned on. If J1 is inserted (connecting EN to VIN for

automatic startup), the regulator powers up.

Figure 16. Ground Current vs. Input Voltage, VOUT = 2.8 V, TA= 25°C

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Evaluation Board User Guide UG-116

Rev. A | Page 9 of 12

BILL OF MATERIALS

Table 2.

Reference Designator Description Manufacturer Part No.

C1, C2 Capacitor, MLCC, 1 μF, 10 V, 0402, X5R Murata (or equivalent)

J1 Header, single, STR, 2 pins Sullins Connector Solutions PEC02SAAN

U1 IC, LDO regulator Analog Devices, Inc. ADP151

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UG-116 Evaluation Board User Guide

Rev. A | Page 10 of 12

NOTES

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