ADM7170ACP-EVALZ/ADM7171ACP-EVALZ/
ADM7172ACP-EVALZ
UG-684
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
Evaluating the ADM7170, ADM7171, and ADM7172
FEATURES
GENERAL DESCRIPTION
Input voltage range: 2.3 V to 6.5 V
Output current range: 0 mA to 2 A (500 mA for ADM7170, 1 A
for ADM7171, 2 A for ADM7172)
Output voltage accuracy: ±0.75% for ADM7170, −0.5%/+1%
for ADM7171/ADM7172
Operating temperature range: −40°C to +125°C
Output voltage can also be adjusted up with two external
resistors from any fixed output voltage option
VOUT = VOUT(FIXED) × (1 + R1/R2)
The ADM7170ACP-EVALZ/ADM7171ACP-EVALZ/
ADM7172ACP-EVALZ is an evaluation board used to demonstrate
the functionality of the ADM7170, ADM7171, and ADM7172
linear regulators.
Simple device measurements, such as line and load regulation,
dropout, and ground current, can be demonstrated with just a
single voltage source, a voltmeter, an ammeter, and load resistors.
For more details about the linear regulators, visit www.analog.com.
12252-001
EVALUATION BOARD PHOTOGRAPH
Figure 1.
PLEASE SEE THE LAST PAGE FOR AN IMPORTANT
WARNING AND LEGAL TERMS AND CONDITIONS.
Rev. 0 | Page 1 of 7
UG-684
ADM7170ACP-EVALZ/ADM7171ACP-EVALZ/ADM7172ACP-EVALZ User Guide
TABLE OF CONTENTS
Features .............................................................................................. 1
Line Regulation..............................................................................5
General Description ......................................................................... 1
Load Regulation ............................................................................5
Evaluation Board Photograph......................................................... 1
Dropout Voltage ............................................................................5
Revision History ............................................................................... 2
Ground Current Measurements ......................................................6
Evaluation Board Hardware and Schematic ................................. 3
Ground Current Consumption ...................................................6
Evaluation Board Configurations .............................................. 3
Ordering Information .......................................................................7
Output Voltage Measurements ....................................................... 4
Bill of Materials ..............................................................................7
REVISION HISTORY
8/14—Revision 0: Initial Version
Rev. 0 | Page 2 of 7
ADM7170ACP-EVALZ/ADM7171ACP-EVALZ/ADM7172ACP-EVALZ User Guide
UG-684
EVALUATION BOARD HARDWARE AND SCHEMATIC
The output voltage is set by
EVALUATION BOARD CONFIGURATIONS
The evaluation board comes supplied with different components
depending on which version is ordered. Components common to
all versions are C1, C2, C3, JP1, and JP2. Resistor R1 and
Resistor R2 are used to adjust the output voltage above any fixed
voltage option. C4 and R3 are optional components for the
noise reduction network.
VOUT = VOUT(FIXED) × (1 + R1/R2)
Figure 2 shows the schematic of this evaluation board
configuration.
TP1
TP2
7
C1
4.7µF
TP3
JP1
2
1
6
5
1
1 WAY LINK
VIN1
VOUT1
VIN2
VOUT2
GND
EN
SENSE
SS
PD
CON8
ADP717x 3x3
1
J2
VOUT
VOUT
C2
4.7µF
2
2
8
1
1
VIN
1
2
3
4
5
6
7
8
U1
R3
3.01kΩ
3
4
PAD
1
JP2
1 WAY LINK
1
J1
TP4
R1
45.3kΩ
C3
1000pF
C4
1µF
1
2
3
4
5
6
7
8
CON8
J8
1
2
CON2
R2
30.1kΩ
CON4
J6
1
2
3
4
1
2
3
4
CON4
J7
1
2
3
4
CON4
1
2
3
4
12252-002
J5
J4
CON4
Figure 2. Evaluation Board Schematic
Table 1. Evaluation Board Hardware Components
Component
U1
Function
Linear regulator
C1
C2
C3
C4
R1
R2
R3
JP1
JP2
Input capacitor
Output capacitor
Soft start capacitor
Noise reduction capacitor
Output divider
Output divider
Noise Reduction resistor
Jumper
Jumper
Description
ADM7170, ADM7171, or ADM7172 linear regulator. Component varies depending on the
evaluation board type ordered.
4.7 μF input bypass capacitor.
4.7 μF output capacitor. Required for stability and transient performance.
Set soft start time to limit inrush current.
1 μF, noise reduction network with R3.
45.3 kΩ, sets output voltage to 3.0 V with R2.
30.1 kΩ, sets output voltage to 3.0 V with R1.
3.01 kΩ, noise reduction network with C4.
Connects EN to VIN for automatic startup.
Connects SENSE pin to output for fixed output options.
Rev. 0 | Page 3 of 7
UG-684
ADM7170ACP-EVALZ/ADM7171ACP-EVALZ/ADM7172ACP-EVALZ User Guide
OUTPUT VOLTAGE MEASUREMENTS
VOLTAGE SOURCE
VOLTMETER
1.99711
–
+
+
–
12252-003
LOAD
Figure 3. Output Voltage Measurement
Figure 3 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 adequate
to handle the power 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.
The voltage source can now be turned on. If JP1 is inserted
(connecting EN to VIN for automatic startup), the regulator
powers up.
If the load current is large, the user needs to connect the voltmeter
as close as possible to the output capacitor to reduce the effects
of IR drops.
Use the following steps to connect to a voltage source and
voltmeter:
1.
2.
3.
4.
5.
Connect the negative terminal (−) of the voltage source to
one of the GND pads on the evaluation board.
Connect the positive terminal (+) of the voltage source to
the VIN pad of the evaluation board.
Connect a load between the VOUT pad and one of the
GND pads.
Connect the negative terminal (−) of the voltmeter to one
of the GND pads.
Connect the positive terminal (+) of the voltmeter to the
VOUT pad.
Rev. 0 | Page 4 of 7
ADM7170ACP-EVALZ/ADM7171ACP-EVALZ/ADM7172ACP-EVALZ User Guide
UG-684
LINE REGULATION
DROPOUT VOLTAGE
For line regulation measurements, the regulator’s output 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 during this
measurement, VIN must be varied between VOUTNOM + 0.5 V (or
2.3 V, whichever is greater) and VINMAX. For example, for an
ADM7170/ADM7171/ADM7172 with fixed 2.5 V output, VIN
needs to be varied between 3.0 V and 6.5 V. This measurement
can be repeated under different load conditions. Figure 4 shows
the typical line regulation performance of an ADM7170/
ADM7171/ADM7172 with fixed 2.5 V output.
Dropout voltage can be measured using the configuration shown
in Figure 3. 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 for output voltages greater
than 2.3 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 6 shows a
typical curve of dropout voltage measurements with different
load currents.
2.55
250
2.54
LOAD = 5mA
LOAD = 10mA
LOAD = 100mA
LOAD = 500mA
LOAD = 1000mA
LOAD = 2000mA
VOUT (V)
2.52
2.51
200
VDROPOUT (mV)
2.53
2.50
2.49
150
100
2.48
2.47
50
3.0
4.0
3.5
4.5
VIN (V)
5.0
5.5
6.0
6.5
0
12252-004
2.45
2.5
1
For load regulation measurements, the regulator’s output 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 measurement. The
load current can be varied from 0 mA to 2 A. Figure 5 shows the
typical load regulation performance of an ADM7170/
ADM7171/ADM7172 with fixed 2.5 V output for an input
voltage of 3.0 V.
2.55
2.54
2.53
2.51
2.50
2.49
2.48
2.47
2.46
2.45
1000
10000
12252-005
VOUT (V)
2.52
100
ILOAD (mA)
1000
Figure 6. Dropout Voltage vs. Load Current
LOAD REGULATION
10
100
ILOAD (mA)
Figure 4. Output Voltage vs. Input Voltage
1
10
Figure 5. Output Voltage vs. Load Current
Rev. 0 | Page 5 of 7
10000
12252-006
2.46
UG-684
ADM7170ACP-EVALZ/ADM7171ACP-EVALZ/ADM7172ACP-EVALZ User Guide
GROUND CURRENT MEASUREMENTS
VOLTAGE SOURCE
–
+
AMMETER
LOAD
0.00112
+
12252-007
–
Figure 7. Ground Current Measurement
Figure 7 shows 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 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 used can supply enough current for the expected
load levels.
Use the following steps to connect to a voltage source and
ammeter:
3.
4.
10
Connect the positive terminal (+) of the voltage source to
the VIN pad on the evaluation board.
Connect the positive terminal (+) of the ammeter to one of
the GND pads of the evaluation board.
Connect the negative terminal (−) of the ammeter to the
negative (−) terminal of the voltage source.
Connect a load between the negative (−) terminal of the
voltage source and the VOUT pad of the evaluation board.
9
8
7
6
5
4
3
2
The voltage source can now be turned on. If JP1 is inserted
(connecting EN to VIN for automatic startup), the regulator
powers up.
1
0
1
10
100
ILOAD (mA)
1000
10000
12252-008
2.
Ground current measurements can determine how much current
the internal circuits of the regulator are consuming while the
circuits perform the regulation function. To be efficient, the
regulator needs to consume as little current as possible.
Typically, the regulator uses the maximum current when
supplying its largest load level (2 A). Figure 8 shows the typical
ground current consumption for various load levels at an input
voltage of 3.0 V for an output voltage of 2.5 V.
GROUND CURRENT (mA)
1.
GROUND CURRENT CONSUMPTION
Figure 8. Ground Current vs. Load Current
When the device is disabled (EN = GND), the ground current
drops to less than 3 μA.
Rev. 0 | Page 6 of 7
ADM7170ACP-EVALZ/ADM7171ACP-EVALZ/ADM7172ACP-EVALZ User Guide
UG-684
ORDERING INFORMATION
BILL OF MATERIALS
Table 2.
Qty
1
Reference
Designator
U1
Description
ADM7170, ADM7171, or ADM7172 linear regulator
Manufacturer/Vendor
Analog Devices, Inc.
2
1
1
2
1
1
1
C1, C2
C3
C4
JP1, JP2
R1
R2
R3
Capacitor, MLCC, 4.7 μF, 16 V, 0805, X5R
Capacitor, MLCC, 0805 case
Capacitor, MLCC, 1 μF, 16 V, 0805, X5R
Header, single, STR, 2 pins
45.3 kΩ, resistor, 1%, 0603 case
30.1 kΩ, resistor, 1%, 0603 case
3.01 kΩ, resistor, 1%, 0603 case
Murata (or equivalent)
Murata (or equivalent)
Sullins Connector Solutions
Vendor Part Number
ADM7170ACP,
ADM7170ACP, or
ADM7170ACP
PEC02SAAN
CRCW0603xxxxF
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 personal jurisdiction and venue of such courts. The United Nations Convention on Contracts for the International Sale of Goods shall not apply to this Agreement and is expressly disclaimed.
©2014 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
UG12252-0-8/14(0)
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