Datasheet UG-188 Datasheet (ANALOG DEVICES)

Evaluation Board User Guide

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UG-188

Evaluation Board for the ADP2119/ADP2120 Step-Down Regulator

GENERAL DESCRIPTION

The ADP2119/ADP2120 are synchronous, step-down, dc-to-dc
regulators in a compact 3 mm × 3 mm LFCSP_WD package.

The ADP2119/ADP2120 evaluation boards provide an easy way
to evaluate the device. This user guide describes how to quickly
set up the board to collect performance data. Full details on the
ADP2119/ADP2120 are available in the ADP2119/ADP2120
data sheet, which is available from Analog Devices, Inc., and

ADP2119/ADP2120 EVALUATION BOARDS

should be consulted in conjunction with this user guide when
using the evaluation boards.

The ADP2119/ADP2120 run from input voltages of 2.3 V to 5.5 V
and require minimal external components to provide a high
efficiency solution with integrated power switch, synchronous
rectifier, and internal compensation.

09314-001

Figure 1. ADP2119 Evaluation Board Figure 2. ADP2120 Evaluation Board

09314-002

PLEASE SEE THE LAST PAGE FOR AN IMPORTANT
WARNING AND LEGAL TERMS AND CONDITIONS.

Rev. 0 | Page 1 of 8

UG-188 Evaluation Board User Guide

TABLE OF CONTENTS

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

ADP2119/ADP2120 Evaluation Boards........................................ 1

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

Setting Up the Evaluation Board .................................................... 3

Powering up the Evaluation Board ............................................ 3

Measuring Evaluation Board Performance............................... 3

REVISION HISTORY

9/10—Revision 0: Initial Version

Typical Performance Characteristics ..............................................5

Evaluation Board Schematics and Artwork...................................6

Evaluation Board Layout ..................................................................7

Ordering Information.......................................................................8

Bill of Materials..............................................................................8

Rev. 0 | Page 2 of 8

Evaluation Board User Guide UG-188

×

SETTING UP THE EVALUATION BOARD

POWERING UP THE EVALUATION BOARD

The ADP2119/ADP2120 evaluation boards are fully assembled
and tested. Before applying power to the evaluation boards,
follow the setup procedures in this section.

Jumper Settings

Refer to Tabl e 1 for selecting the jumper positions.

Before selecting the jumper positions, make sure that the enable
input, EN, is high.

Table 1. Jumper Settings

Jumper States Function

High Enable V
Low Disable V

J5
(SYNC/MODE)

High Force PWM (FPWM)
Low Enable PFM
External

clock
High Tracking function not used J7 (TRK)
External

voltage

Synchronize to the external clock

Tracking with the external
voltage

Input Power Source Connection

Before connecting the power source to the ADP2119/ADP2120
evaluation boards, make sure that they are turned off. If the
input power source includes a current meter, use that meter to
monitor the input current.

Connect the positive terminal of the power source to the VIN
terminal (J1) on the evaluation boards, and the negative
terminal of the power source to the GND terminal (J2) of the
board. If the power source does not include a current meter,
connect a current meter in series with the input source voltage.

Connect the positive terminal of the power source to the ammeter
positive terminal (+), the negative terminal of the power source
to the GND terminal (J2) on the evaluation board, and the
negative terminal (−) of the ammeter to the VIN terminal (J1)
on the board.

Output Load Connection

Make sure that the board is turned off before connecting the
load. If the load includes an ammeter, or if the current is not
measured, connect the load directly to the evaluation board
with the positive (+) load connection to the VOUT terminal
(J4) and negative (−) load connection to the GND terminal (J6).

If an ammeter is used, connect it in series with the load;
connect the positive (+) ammeter terminal to the evaluation
board VOUT terminal (J4), the negative (−) ammeter terminal
to the positive (+) load terminal, and the negative (−) load
terminal to the evaluation board GND terminal (J6).

Input and Output Voltmeter Connections

Measure the input and output voltages with voltmeters. Make
sure that the voltmeters are connected to the appropriate test

OUT

OUT

J3 (EN)

Rev. 0 | Page 3 of 8

points on the board. If the voltmeters are not connected to the
right test point, the measured voltages may be incorrect due to
the voltage drop across the leads and/or connections between
the boards, the power source, and/or load.

Connect the positive (+) terminal of the input voltage
measuring voltmeter to Test Point T2 and the negative (−)
terminal to Test Point T1.

Connect the positive (+) terminal of the output voltage
measuring voltmeter to Test Point T4 and the negative (−)
terminal to Test Point T5.

Power On the Evaluation Board

When the power source and load are connected to the ADP2119/
ADP2120 evaluation board, it can be powered up for operation.
If the input power source is above 2.3 V, the output voltage rises
to 1.2 V as the default setting.

MEASURING EVALUATION BOARD PERFORMANCE

Measuring the Switching Waveform

To observe the switching waveform with an oscilloscope,
place the oscilloscope probe tip at Test Point T6 with the
probe ground connected to GND. Set the oscilloscope to a
dc coupling, 2 V/division, and 1 μs/division time base. The
switching waveform should alternate between 0 V and
approximately the input voltage.

Measuring Load Regulation

Load regulation should be tested by increasing the load at the
output and measuring the output voltage between the T4 and
T5 test points.

Measuring Line Regulation

Vary the input voltage and measure the output voltage at a fixed
output current. Input voltage can be measured between T2 and
T1. The output voltage is measured between T4 and T5.

Measuring Efficiency

The efficiency, η, is measured by comparing the input power
with the output power.

IV

OUTOUT

η

=

Measuring Inductor Current

The inductor current can be measured by removing one end of
the inductor from the pad on the board and using a wire con­nected between the pad and the inductor. Then, a current probe
can be used to measure the inductor current.

Measuring Output Voltage Ripple

To observe the output voltage ripple, place an oscilloscope
probe across the output capacitor (C4) with the probe ground
lead placed at the negative (−) capacitor terminal and the probe
tip placed at the positive (+) capacitor terminal. Set the oscillo-

×

IV

ININ

UG-188 Evaluation Board User Guide

scope to an ac coupling, 10 mV/division, 2 μs/division time base
and 20 MHz bandwidth.

A standard oscilloscope probe has a long wire ground clip. For
high frequency measurements, this ground clip picks up high
frequency noise and injects it into the measured output ripple.
Figure 3 shows an easy way to measure the output ripple prop­erly. It requires removing the oscilloscope probe sheath and
wrapping a nonshielded wire around the oscilloscope probe.
By keeping the ground lengths of the oscilloscope probe as
short as possible, true ripple can be measured.

Output Voltage Change

The ADP2119/ADP2120 evaluation board output is preset to

1.2 V; however, the output voltage can be adjusted using the
following equation:

V

OUT

V6.0

+

34

RR

⎛

×=

⎜
⎝

⎞
⎟

4

R

⎠

Figure 3. Output Ripple Measurement

09314-003

Rev. 0 | Page 4 of 8

Evaluation Board User Guide UG-188

TYPICAL PERFORMANCE CHARACTERISTICS

100

90

80

70

60

50

V

= 1.0V

40

EFFI CIENCY (%)

30

20

10

0

0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0

OUTPUT CURRENT (A)

Figure 4. ADP2119 Efficiency, V

OUT

V

= 1.2V

OUT

V

= 1.5V

OUT

V

= 1.8V

OUT

V

= 2.5V

OUT

V

= 3.3V

OUT

= 5 V, FPWM

IN

1

2

4

CH1 20.0mV

09314-004

V

(AC)

OUT

SW

I

L

B

CH2 5.00V

W

CH4 500mA Ω

M4.00µs A CH4 820mA

T –40.0000ns

Figure 7. PFM Mode (ADP2120)

09314-007

100

90

80

70

60

50

V

= 1.0V

40

EFFI CIENCY (%)

30

20

10

0

0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0

OUTPUT CURRENT (A)

OUT

V

= 1.2V

OUT

V

= 1.5V

OUT

V

= 1.8V

OUT

V

= 2.5V

OUT

Figure 5. ADP2119 Efficiency, VIN = 3.3 V, FPWM

V

(AC)

1

2

OUT

SW

EN

3

1

2

4

CH1 500mV

09314-005

CH3 5.00V

Figure 8. Soft Start (ADP2119, V

1

B

CH2 5.00V

W

CH4 2.00A Ω

V

OUT

I

O

V

(AC)

OUT

PGOOD

I

L

M400µs A CH3 3.60V

T 30.40%

= 5 V, V

IN

= 1.2 V)

OUT

09314-008

I

L

4

CH1 5.00mV

B

CH2 5.00V

W

CH4 1.00A Ω

M1.00µs A CH2 4.30V

T –40.0000ns

Figure 6. Continuous Conduction Mode (ADP2120)

09314-006

4

CH1 50.0mV

B

W

CH4 1.00A Ω

M200µs A CH3 880mA

T 596.000µs

Figure 9. Load Transient (ADP2119, FPWM, V

= 5 V, V

IN

= 1.2 V)

OUT

09314-009

Rev. 0 | Page 5 of 8

UG-188 Evaluation Board User Guide

EVALUATION BOARD SCHEMATICS AND ARTWORK

T2

T1

VIN

GND

1

1

R1

10Ω

C1

0.1µF

ADP2119

VIN

PVIN

SW

PGND

GND

10kΩ

OPTIONAL

L1

1.5µH

1

2

12

1

T6
SW

3

4

5

Figure 10. ADP2119 Evaluation Board Schematic

VIN

GND

VOUT

GND

2
1

J1

2

J2

1

1

J4

2

1

J6

2

1

T4

VOUT

T1

GND

1

T5

GND

T2

VIN

C2

22µF/6.3V

C3

22µF

6.3V

C4

22µF

6.3V

U1

SYNC/MODE

PGOOD

TRK

EPAD

11

R3

C5

EN

FB

T3

PGOOD

1

R2

10kΩ

10

9

8

7

6

R4

10kΩ

T3

PGOOD

3
2
1

3
2
1

3
2
1

1

J3
EN

J5
SYNC/MODE

J7
TRK

T7
GND

09314-010

VIN

GND

VOUT

GND

1

1

2

J1

1

2

J2

1

J4

1
2

J6

1
2

1

T4

GND

VOUT

C2
22µF/6.3V

C4

C3

22µF

10µF

6.3V

6.3V

1

T5

L1

1.5µH

R1

10Ω

C1

0.1µF

1

2

12

1

T6

SW

3

4

5

VIN

PVIN

SW

PGND

GND

U1

ADP2120

SYNC/MODE

EPAD

11

R3

10kΩ

C5

OPTIONAL

EN

PGOOD

TRK

FB

10kΩ

10

9

8

7

6

R4

10kΩ

1

R2

3

J3

2

EN

1

3

J5

2

SYNC/MODE

1

3

J7

2

TRK

1

1

T7
GND

09314-011

Figure 11. ADP2120 Evaluation Board Schematic

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Evaluation Board User Guide UG-188

EVALUATION BOARD LAYOUT

Figure 12. Top Layer

09314-012

09314-014

Figure 13. Bottom Layer

09314-013

Figure 14. Silkscreen Top

Rev. 0 | Page 7 of 8

UG-188 Evaluation Board User Guide

ORDERING INFORMATION

BILL OF MATERIALS

Table 2. ADP2119 Evaluation Board Bill of Materials

Qty Part Reference Type Description PCB Footprint Vendor Part Number

1 C1 Capacitor 0.1 μF, 50 V C0603 Murata GRM188F51H104ZA01
3 C2, C3, C4 Capacitor 22 μF, 6.3 V, X5R C1206 Murata GRM31CR60J226KE19
1 C5 Capacitor Optional C0603 Murata Optional
1 L1 Inductor 1.5 μH Sumida_CDRH5D18 Sumida CDRH5D18BHPNP-1R5M
1 R1 Resistor 10 Ω R0603 Vishay Dale CRCW060310R0FKEA
3 R2, R3, R4 Resistor 10 kΩ, 1% R0603 Vishay Dale CRCW060310K0JKTA
1 U1 IC 2 A buck regulator 10-lead LFCSP_WD Analog Devices ADP2119ACPZ-R7
7 T1,T2, T3, T4, T5, T6, T7 Test point SIP1 SIP1 Harwin M20-9990245
4 J1, J2, J4, J6 Connector SIP2 SIP2 Harwin M20-9990245
3 J3, J5, J7 Jumper SIP3 SIP3 Harwin M20-9990346

Table 3. ADP2120 Evaluation Board Bill of Materials

Qty Part Reference Type Description PCB Footprint Vendor Part Number

1 C1 Capacitor 0.1 μF, 50 V C0603 Murata GRM188F51H104ZA01
2 C2, C4 Capacitor 22 μF, 6.3 V, X5R C1206 Murata GRM31CR60J226KE19
1 C3 Capacitor 10 μF, 6.3 V, X5R C1206 Murata GRM319R60J106KE19
1 C5 Capacitor Optional C0603 Murata Optional
1 L1 Inductor 1.5 μH Sumida_CDRH5D18 Sumida CDRH5D18BHPNP-1R5M
1 R1 Resistor 10 Ω R0603 Vishay Dale CRCW060310R0FKEA
3 R2, R3, R4 Resistor 10 kΩ, 1% R0603 Vishay Dale CRCW060310K0JKTA
1 U1 IC 1.25 A buck regulator 10-lead LFCSP_WD Analog Devices ADP2120ACPZ-R7
7 T1,T2, T3, T4, T5, T6, T7 Test point SIP1 SIP1 Harwin M20-9990245
4 J1, J2, J4, J6 Connector SIP2 SIP2 Harwin M20-9990245
3 J3, J5, J7 Jumper SIP3 SIP3 Harwin M20-9990346

ESD Caution
ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection

circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality.

Legal Terms and Conditions

By using the evaluation board discussed herein (together with any tools, components documentation or support materials, the “Evaluation Board”), you are agreeing to be bound by the terms and conditions
set forth below (“Agreement”) unless you have purchased the Evaluation Board, in which case the Analog Devices Standard Terms and Conditions of Sale shall govern. Do not use the Evaluation Board until you
have read and agreed to the Agreement. Your use of the Evaluation Board shall signify your acceptance of the Agreement. This Agreement is made by and between you (“Customer”) and Analog Devices, Inc.
(“ADI”), with its principal place of business at One Technology Way, Norwood, MA 02062, USA. Subject to the terms and conditions of the Agreement, ADI hereby grants to Customer a free, limited, personal,
temporary, non-exclusive, non-sublicensable, non-transferable license to use the Evaluation Board FOR EVALUATION PURPOSES ONLY. Customer understands and agrees that the Evaluation Board is provided
for the sole and exclusive purpose referenced above, and agrees not to use the Evaluation Board for any other purpose. Furthermore, the license granted is expressly made subject to the following additional
limitations: Customer shall not (i) rent, lease, display, sell, transfer, assign, sublicense, or distribute the Evaluation Board; and (ii) permit any Third Party to access the Evaluation Board. As used herein, the term
“Third Party” includes any entity other than ADI, Customer, their employees, affiliates and in-house consultants. The Evaluation Board is NOT sold to Customer; all rights not expressly granted herein, including
ownership of the Evaluation Board, are reserved by ADI. CONFIDENTIALITY. This Agreement and the Evaluation Board shall all be considered the confidential and proprietary information of ADI. Customer may
not disclose or transfer any portion of the Evaluation Board to any other party for any reason. Upon discontinuation of use of the Evaluation Board or termination of this Agreement, Customer agrees to
promptly return the Evaluation Board to ADI. ADDITIONAL RESTRICTIONS. Customer may not disassemble, decompile or reverse engineer chips on the Evaluation Board. Customer shall inform ADI of any
occurred damages or any modifications or alterations it makes to the Evaluation Board, including but not limited to soldering or any other activity that affects the material content of the Evaluation Board.
Modifications to the Evaluation Board must comply with applicable law, including but not limited to the RoHS Directive. TERMINATION. ADI may terminate this Agreement at any time upon giving written notice
to Customer. Customer agrees to return to ADI the Evaluation Board at that time. LIMITATION OF LIABILITY. THE EVALUATION BOARD PROVIDED HEREUNDER IS PROVIDED “AS IS” AND ADI MAKES NO
WARRANTIES OR REPRESENTATIONS OF ANY KIND WITH RESPECT TO IT. ADI SPECIFICALLY DISCLAIMS ANY REPRESENTATIONS, ENDORSEMENTS, GUARANTEES, OR WARRANTIES, EXPRESS OR IMPLIED, RELATED
TO THE EVALUATION BOARD INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTY OF MERCHANTABILITY, TITLE, FITNESS FOR A PARTICULAR PURPOSE OR NONINFRINGEMENT OF INTELLECTUAL
PROPERTY RIGHTS. IN NO EVENT WILL ADI AND ITS LICENSORS BE LIABLE FOR ANY INCIDENTAL, SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES RESULTING FROM CUSTOMER’S POSSESSION OR USE OF
THE EVALUATION BOARD, INCLUDING BUT NOT LIMITED TO LOST PROFITS, DELAY COSTS, LABOR COSTS OR LOSS OF GOODWILL. ADI’S TOTAL LIABILITY FROM ANY AND ALL CAUSES SHALL BE LIMITED TO THE
AMOUNT OF ONE HUNDRED US DOLLARS ($100.00). EXPORT. Customer agrees that it will not directly or indirectly export the Evaluation Board to another country, and that it will comply with all applicable
United States federal laws and regulations relating to exports. GOVERNING LAW. This Agreement shall be governed by and construed in accordance with the substantive laws of the Commonwealth of
Massachusetts (excluding conflict of law rules). Any legal action regarding this Agreement will be heard in the state or federal courts having jurisdiction in Suffolk County, Massachusetts, and Customer hereby
submits to the pers onal jurisdiction and venu e of such courts. The United Nations Conventi on on Contracts for the Internation al Sale of Goods shall not apply to this Agreement and is expressly disclaimed.

©2010 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
UG09314-0-9/10(0)

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