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Evaluation Board for the ADP1720

EVAL-ADP1720

Rev. 0

Evaluation boards are only intended for device evaluation and not for production purposes.

Evaluation boards are supplied “as is” and without warranties of any kind, express, implied, or

statutory including, but not limited to, any implied warranty of merchantability or fitness for a

particular purpose. No license is granted by implication or otherwise under any patents or other

intellectual property by application or use of evaluation boards. Information furnished by Analog

Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog

Devices for its use, nor for any infringements of patents or other rights of third parties that may result

from its use. Analog Devices reserves the right to change devices or specifications at any time

without notice. Trademarks and registered trademarks are the property of their respective owners.

Evaluation boards are not authorized to be used in life support devices or systems.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700 www.analog.com

FEATURES

Input voltage range: 4 V to 28 V

Output current range: 0 mA to 50 mA

Output voltage accuracy: ±1%

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

GENERAL DESCRIPTION

The ADP1720 evaluation board can be used to demonstrate the

functionality of the ADP1720 linear regulator. Depending on

what component combinations are used, the evaluation board

can be used for ADP1720 fixed output voltage devices and

ADP1720 adjustable output voltage devices.

Simple device measurements such as line and load regulation,

dropout, and ground current can be demonstrated with just a

single voltage supply, a voltage meter, a current meter, and load

resistors.

For more details about the ADP1720 linear regulators, visit

www.analog.com.

EVALUATION BOARD

GND GND

VIN VOUT

C1 C2

GND/ADJ

EVAL-ADP1720

06768-001

Figure 1.

Summary of content (8 pages)

PAGE 1
Evaluation Board for the ADP1720 EVAL-ADP1720 FEATURES GENERAL DESCRIPTION Input voltage range: 4 V to 28 V Output current range: 0 mA to 50 mA Output voltage accuracy: ±1% Operating temperature range: −40°C to +125°C The ADP1720 evaluation board can be used to demonstrate the functionality of the ADP1720 linear regulator. Depending on what component combinations are used, the evaluation board can be used for ADP1720 fixed output voltage devices and ADP1720 adjustable output voltage devices.
PAGE 2
EVAL-ADP1720 TABLE OF CONTENTS Features .............................................................................................. 1 Load Regulation ............................................................................6 General Description ......................................................................... 1 Dropout Voltage ............................................................................6 Evaluation Board ......................................................................
PAGE 3
EVAL-ADP1720 EVALUATION BOARD HARDWARE AND SCHEMATIC GND VIN GND C1 U1 GND/ADJ J1 EN 1 GND/ADJ GND 8 2 IN GND 7 3 OUT GND 6 4 EN GND 5 J2 R1 C2 GND VOUT GND 06768-002 R2 Figure 2. Evaluation Board Schematic Table 1. Evaluation Board Hardware Components Component U1 1 C1 C2 R1, R2 2 J1 J23 1 2 3 Function Linear regulator Input capacitor Output capacitor Output voltage adjust resistors Jumper Jumper Description ADP1720 Low Dropout Linear Regulator. 1 μF Input Bypass Capacitor.
PAGE 4
EVAL-ADP1720 EVALUATION BOARD CONFIGURATIONS ADP1720 ADJUSTABLE OUTPUT Evaluation boards that come supplied with ADP1720 adjustable output voltage option devices have the additional R1 and R2 resistors included. Figure 3 shows the schematic of this evaluation board configuration. ADP1720 FIXED OUTPUT Fixed output voltage evaluation boards are available in 3.3 V and 5 V options. For fixed output devices, J2 is inserted to connect the GND/ADJ pin to ground.
PAGE 5
EVAL-ADP1720 OUTPUT VOLTAGE MEASUREMENTS VOLTAGE SOURCE + VOLTAGE METER V EVAL-ADP1720 _ _ U1 GND C1 + GND C2 R1 J1 R2 VIN VOUT LOAD GND GND/ADJ EN 06768-005 J2 GND Figure 5. 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.
PAGE 6
EVAL-ADP1720 LOAD REGULATION DROPOUT VOLTAGE 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 levels. The input voltage must be held constant during this measurement. The load current can be varied from 0 mA to 50 mA. Figure 7 shows the typical load regulation performance of an ADP1720 with 5 V output for an input voltage of 12 V.
PAGE 7
EVAL-ADP1720 GROUND CURRENT MEASUREMENTS CURRENT METER _ μA EVAL-ADP1720 + U1 GND C1 GND C2 VOLTAGE SOURCE + R1 _ J1 R2 LOAD VIN VOUT EN GND 06768-009 J2 GND GND/ADJ Figure 9. largest load level (50 mA). Figure 10 shows the typical ground current consumption for various load levels. 1200 1000 800 IGND (µA) Follow these steps to connect to a voltage source and current meter: 1. 2. 3. 4. 5.
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EVAL-ADP1720 ORDERING INFORMATION BILL OF MATERIALS Table 2. Qty 1 1 1 1 2 1 Reference Designator C1 C2 R1 R2 J1, J2 U1 Description Capacitor, MLCC, 1 μF, 50 V, 0805, X7R Capacitor, MLCC, 1 μF, 16 V, 0805, X7R Resistor, 15 kΩ, 1%, 0805 Resistor, 10 kΩ, 1%, 0805 Header, single, STR, 2 pins ADP1720, IC, LDO regulator ORDERING GUIDE Model ADP1720-EVALZ1 ADP1720-3.