ADP1764-EVALZ/ADP1765-EVALZ User Guide
UG-1072
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 ADP1764 and ADP1765 Low VIN, Low Noise, CMOS Linear Regulators
FEATURES
EVALUATION BOARD PHOTOGRAPHS
Full featured evaluation boards for ADP1764 and ADP1765
Input voltage range: 1.10 V to 1.98 V
Output current range:
ADP1764: 0 mA to 4 A
ADP1765: 0 mA to 5 A
Evaluation available on adjustable or fixed output voltage
Convenient test points for electrical measurements
Operating temperature range: −40°C to +125°C
ADDITIONAL EQUIPMENT NEEDED
Voltage source
Voltmeter
Ammeter
Electronic resistor load
The ADP1764-1.0-EVALZ and ADP1765-1.0-EVALZ fixed
evaluation boards and the ADP1764-ADJ-EVALZ and ADP1765ADJ-EVALZ adjustable evaluation boards demonstrate the
functionality of the ADP1764 and the ADP1765 series of linear
regulators.
15194-001
GENERAL DESCRIPTION
Figure 1. The ADP1765-1.0-EVALZ Fixed Board
(Identical to the ADP1764-1.0-EVALZ)
Simple device measurements, such as line and load regulation,
dropout voltage, and ground current, are demonstrated with
only a single voltage supply, a voltmeter, an ammeter, and load
resistors.
Figure 1 and Figure 2 show the ADP1765 evaluation boards;
the ADP1764 fixed and adjustable evaluation boards are
identical to the ADP1765.
15194-002
For full details on the ADP1764 and the ADP1765 linear
regulators, see the ADP1764 and the ADP1765 data sheets, which
should be consulted in conjunction with this user guide when using
these evaluation boards.
Figure 2. The ADP1765-ADJ-EVALZ Adjustable Board
(Identical to the ADP1764-ADJ-EVALZ)
PLEASE SEE THE LAST PAGE FOR AN IMPORTANT
WARNING AND LEGAL TERMS AND CONDITIONS.
Rev. 0 | Page 1 of 9
UG-1072
ADP1764-EVALZ/ADP1765-EVALZ User Guide
TABLE OF CONTENTS
Features .............................................................................................. 1
Load Regulation Measurements ..................................................5
General Description ......................................................................... 1
Dropout Voltage Measurements..................................................5
Evaluation Board Photographs ....................................................... 1
Ground Current Measurements ..................................................5
Revision History ............................................................................... 2
Ground Current Consumption ...................................................6
Evaluation Board Hardware ............................................................ 3
Evaluation Board Schematics and Artwork ...................................7
Evaluation Board Configurations .............................................. 3
Ordering Information .......................................................................9
Output Voltage Measurements ................................................... 4
Bill of Materials ..............................................................................9
Line Regulation Measurements .................................................. 5
REVISION HISTORY
1/2017—Revision 0: Initial Version
Rev. 0 | Page 2 of 9
ADP1764-EVALZ/ADP1765-EVALZ User Guide
UG-1072
EVALUATION BOARD HARDWARE
EVALUATION BOARD CONFIGURATIONS
Calculate the start-up time of the regulator by
The ADP1764 and ADP1765 evaluation boards come supplied
with different components, depending on the adjustable or fixed
version ordered. Components common to all versions are C1,
C2, C3, C4, C5, J1, and R2. Use R1 for the ADP1764-ADJ-EVALZ
and ADP1765-ADJ-EVALZ evaluation boards. Figure 9 and
Figure 10 show the schematics of these evaluation board
configurations, and Table 1 describes the hardware components.
The ADP1764-ADJ-EVALZ and ADP1765-ADJ-EVALZ have
an output voltage range of 0.5 V to 1.5 V. The output voltage is
set to 1.0 V by the external 6.8 kΩ adjust resistor.
tSTART-UP_FIXED = tDELAY + VREF × (CSS/ISS)
tSTART-UP_ADJ = tDELAY + VADJ × (CSS/ISS)
where:
tDELAY is a fixed delay of 100 µs.
VREF is a 0.5 V internal reference for the fixed output model option.
CSS is the soft start capacitance from the SS pin to GND.
ISS is the current sourced from the SS pin (10 µA).
VADJ is the voltage at the VADJ pin equal to RADJ × IADJ.
Table 1. Evaluation Board Hardware Components
Component
U1
Calculate the output voltage (VOUT) by
VOUT = AD × (RADJ × IADJ)
where:
AD is the gain factor with a typical value of 2.99 between the
VADJ pin and VOUT pin.
RADJ is the resistor connected between the VADJ pin and
ground.
IADJ is the 50 µA constant current from the VADJ pin.
The ADP1764-1.0-EVALZ and ADP1765-1.0-EVALZ fixed
evaluation boards use a 1.0 V output model. Do not connect R1
for the fixed output option.
C1
C2
C3
C4
C5
J1
R1
R2
Rev. 0 | Page 3 of 9
Description
ADP1764 and ADP1765 low dropout linear
regulators.
For the fixed output option, U1 uses the 1.0 V
output option of the ADP1764 and the ADP1765.
For the adjustable output option, U1 uses the
adjustable option of the ADP1764 and the
ADP1765 and is set to 1.0 V.
Input bypass capacitor (CIN), 22 µF, 0603 size.
Output capacitor (COUT), 22 µF, 0603 size.
Soft start capacitor (CSS), 1000 pF, 0603 size.
(not installed in the evaluation board)
Regulator capacitor (CREG), 1 µF, 0603 size.
Reference capacitor (CREG), 1 µF, 0603 size.
Jumper (connects EN to VIN for automatic startup)
Adjust resistor (RADJ) used to set the output
voltage of the adjustable version of the ADP1764
and the ADP1765.
Pull-up resistor (RPULL-UP) used for the open-drain
PG output pin.
UG-1072
ADP1764-EVALZ/ADP1765-EVALZ User Guide
OUTPUT VOLTAGE MEASUREMENTS
VOLTMETER
VOLTAGE
SOURCE
1.29999
+
+
–
–
15194-003
LOAD
Figure 3. Output Voltage Measurement Setup
Figure 3 shows how the evaluation boards 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 expected to dissipate across it. Use an electronic load as
an alternative. Ensure the voltage source can supply enough
current for the expected load levels.
Follow these steps to connect the evaluation board to a voltage
source and voltmeter:
1.
2.
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 on the evaluation board.
3.
4.
5.
Connect a load between the VOUT pad and one of the
GND pads on the evaluation board.
Connect the negative terminal of the voltmeter to one of
the GND pads on the evaluation board.
Connect the positive terminal of the voltmeter to the
VOUT pad on the evaluation board.
When these 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.
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 ohmic voltage drops (IR).
Rev. 0 | Page 4 of 9
ADP1764-EVALZ/ADP1765-EVALZ User Guide
UG-1072
LINE REGULATION MEASUREMENTS
DROPOUT VOLTAGE MEASUREMENTS
For line regulation measurements, the change in the output of
the regulator is measured when the 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 line regulation measurement, VIN must be varied
between VOUT + 0.2 V (or 1.1 V, whichever is greater) and 1.98 V.
For example, for an ADP1764 or an ADP1765 device with a fixed
1.3 V output, VIN must be varied between 1.5 V and 1.98 V. This
measurement can be repeated under different load conditions.
Figure 4 shows the typical line regulation performance of an
ADP1764 and an ADP1765 with a fixed 1.3 V output.
The 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. The ADP1764 and the ADP1765 only
enter dropout mode for output voltages of at least 1.2 V. For
lower voltage outputs, the ADP1764 and the ADP1765 enter
undervoltage lockout and shut down. The dropout voltage
increases with larger loads.
1.305
= 0.1A
= 1.0A
= 2.0A
= 3.0A
= 4.0A
= 5.0A
0.10
1.303
0.09
1.302
0.08
1.301
0.07
1.300
0.06
VDROP (V)
VOUT (V)
1.304
ILOAD
ILOAD
ILOAD
ILOAD
ILOAD
ILOAD
1.299
1.298
1.66
1.74
1.82
1.90
1.98
0.02
15194-004
1.58
VIN (V)
0.01
Figure 4. Output Voltage vs. Input Voltage at VOUT = 1.3 V, TA = 25°C
0
0.1
LOAD REGULATION MEASUREMENTS
1
10
LOAD CURRENT (A)
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 load regulation
measurement. The load current can be varied from 0 mA to 4 A
for the ADP1764 and 0 mA to 5 A for the ADP1765. Figure 5
shows the typical load regulation performance of an ADP1764
and an ADP1765 with a fixed 1.3 V output for an input voltage
of 1.5 V.
1.304
1.303
VOUT (V)
0.04
0.03
1.297
1.296
1.50
0.05
15194-006
1.306
For accurate measurements, use a second voltmeter to monitor
the input voltage across the input capacitor. The input supply
voltage may need adjusting to account for IR drops, especially
when using large load currents. Figure 6 shows the typical curve
of dropout voltage measurements with different load currents.
Figure 6. Dropout Voltage vs. Load Current, VOUT = 1.3 V, TA = 25°C
GROUND CURRENT MEASUREMENTS
Figure 8 shows how the ADP1764 and ADP1765 evaluation
boards can connect to a voltage source and an ammeter for
ground current measurements.
A resistor can be used as the load for the regulator. Ensure the
resistor has a power rating that is adequate to handle the power
expected to be dissipated across it. Use an electronic load as an
alternative. Ensure that the voltage source can supply enough
current for the expected load levels.
1.302
Follow these steps to connect the evaluation board to a voltage
source and ammeter:
1.301
1.
2.
1.300
1.299
3.
1.298
4.
1.296
0.1
1
LOAD CURRENT (A)
10
15194-005
1.297
Figure 5. Output Voltage vs. Load Current at VIN = 1.5 V, VOUT = 1.3 V, TA = 25°C
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 on the evaluation board.
Connect the negative terminal of the ammeter to the
negative terminal of the voltage source.
Connect a load between the VOUT pad on 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.
Rev. 0 | Page 5 of 9
ADP1764-EVALZ/ADP1765-EVALZ User Guide
GROUND CURRENT CONSUMPTION
24
When the device is disabled (EN = GND), the ground current
drops to less than 2 µA.
20
18
ILOAD
ILOAD
ILOAD
ILOAD
ILOAD
ILOAD
= 0.1A
= 1.0A
= 2.0A
= 3.0A
= 4.0A
= 5.0A
16
IGND (mA)
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
(4 A for the ADP1764 and 5 A for the ADP1765). Figure 7 shows
the typical ground current consumption for various load levels at
VOUT = 1.3 V and TA = 25°C.
22
14
12
10
8
6
4
2
0
1.5
1.6
1.7
1.9
1.8
2.0
VIN (V)
Figure 7. Ground Current vs. Input Voltage, VOUT = 1.3 V, TA = 25°C
VOLTAGE
SOURCE
–
+
LOAD
AMMETER
0.012345
+
15194-008
–
Figure 8. Ground Current Measurement Setup
Rev. 0 | Page 6 of 9
15194-007
UG-1072
ADP1764-EVALZ/ADP1765-EVALZ User Guide
UG-1072
15194-009
EVALUATION BOARD SCHEMATICS AND ARTWORK
15194-010
Figure 9. Fixed Output Schematic
Figure 10. Adjustable Output Schematic
Rev. 0 | Page 7 of 9
15194-011
ADP1764-EVALZ/ADP1765-EVALZ User Guide
Figure 11. Top Layer
15194-012
UG-1072
Figure 12. Bottom Layer
Rev. 0 | Page 8 of 9
ADP1764-EVALZ/ADP1765-EVALZ User Guide
UG-1072
ORDERING INFORMATION
BILL OF MATERIALS
Table 2.
Reference
Designator
C1, C2
C31
C4, C5
J1
R1
R2
U1
1
Description
Capacitors, MLCC, 22 μF, 10 V, 0603, X5R
Capacitor, MLCC, 1000 pF, 100 V, 0603, X7R
Capacitors, MLCC, 1 μF, 10 V, 0603, X7R
Header/jumper, single, STR, two pins
Resistor, 0603, 6.8 kΩ, 1% tolerance (do not install on the fixed model)
Resistor, 0603, 100 kΩ, 1% tolerance
IC, low input, low dropout regulators, including the following devices:
Manufacturer
Murata (or equivalent)
Murata (or equivalent)
Murata (or equivalent)
FCI
Any manufacturer
Any manufacturer
Analog Devices, Inc.
Part Number
GRM188R61A226ME15D
GRM188R72A102KA01D
GRM188R71A105KA61D
69157-102HLF
Depends on manufacturer
Depends on manufacturer
ADP1764ACPZ-1.0-R7
ADP1765ACPZ-1.0-R7
ADP1764ACPZ-R7
ADP1765ACPZ-R7
Not installed in the evaluation board.
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.
©2017 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
UG15194-0-1/17(0)
Rev. 0 | Page 9 of 9
工商网监
湘ICP备2023018690号
