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Evaluation Board for the ADP121

EVAL-ADP121

Rev. A

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: 2.3 V to 5.5 V

Output current range: 0 mA to 150 mA

Output voltage accuracy: ±1%

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

GENERAL DESCRIPTION

The ADP121 evaluation boards are used to demonstrate the

functionality of the ADP121 linear regulators.

Simple device measurements such as line and load regulation,

dropout, and ground current can be demonstrated with just a

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

resistors.

For more details about the ADP121 linear regulators, see the

ADP121 data sheet.

EVALUATION BOARD BLOCK DIAGRAMS

VIN VOUT

GND

GNDGND

07140-001

C2C1

ANALOG DEVICES

ADP121-xx-EVALZ

NOTES

1. xx = 28 (2.8V), 30 (3.0V), 33 (3.3V).

Figure 1. TSOT

07140-014

Figure 2. WLCSP

Summary of content (8 pages)

PAGE 1
Evaluation Board for the ADP121 EVAL-ADP121 FEATURES Input voltage range: 2.3 V to 5.5 V Output current range: 0 mA to 150 mA Output voltage accuracy: ±1% Operating temperature range: −40°C to +125°C EVALUATION BOARD BLOCK DIAGRAMS GND GND ANALOG DEVICES ADP121-xx-EVALZ C1 GENERAL DESCRIPTION C2 U1 The ADP121 evaluation boards are used to demonstrate the functionality of the ADP121 linear regulators.
PAGE 2
EVAL-ADP121 TABLE OF CONTENTS Features .............................................................................................. 1 Load Regulation ............................................................................5 General Description ......................................................................... 1 Dropout Voltage ............................................................................5 Evaluation Board Block Diagrams .................................................
PAGE 3
EVAL-ADP121 EVALUATION BOARD HARDWARE EVALUATION BOARD CONFIGURATIONS Table 1. Evaluation Board Hardware Components The EVAL-ADP121 is supplied with different components depending on which version is ordered. Components common to all versions are C1, C2, and J1 or J2. Figure 3 and Figure 4 show schematics for these evaluation board configurations. Component U1 1 VIN VOUT VIN C1 C2 U1 J1 2 GND 3 EN C2 VOUT 5 J1 or J2 07140-002 1 C1 NC 4 Figure 3.
PAGE 4
EVAL-ADP121 MEASURING OUTPUT VOLTAGE VOLTAGE SOURCE + GND GND VOLTMETER ANALOG DEVICES ADP121-xx-EVALZ + – C1 – C2 U1 J1 LOAD VOUT GND EN 07140-003 VIN GND Figure 5. Output Voltage Measurement, TSOT VOLTAGE SOURCE – VOLTMETER + + – 07140-015 LOAD Figure 6. Output Voltage Measurement, WLCSP Figure 5 and Figure 6 show how the evaluation board can be connected to a voltage source and a voltmeter for basic output voltage accuracy measurements.
PAGE 5
EVAL-ADP121 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 mode during this measurement, VIN must be varied between VOUT nominal + 0.5 V (or 2.3 V, whichever is greater) and VIN maximum. For example, an ADP121 with a fixed 1.8 V output needs VIN to be varied between 2.3 V and 5.5 V.
PAGE 6
EVAL-ADP121 MEASURING GROUND CURRENT AMMETER VOLTAGE SOURCE + – – + GND GND ANALOG DEVICES ADP121-xx-EVALZ LOAD C1 C2 U1 J1 VOUT GND EN GND 07140-007 VIN Figure 11. Ground Current Measurement, TSOT VOLTAGE SOURCE – + AMMETER + 07140-016 – LOAD Figure 12. Ground Current Measurement, WLCSP Figure 11 and Figure 12 show the evaluation board connected to a voltage source and an ammeter for ground current measurements. A resistor can be used as the load for the regulator.
PAGE 7
EVAL-ADP121 35 Ground current measurements can determine how much current the regulator’s internal circuits consume 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 (150 mA). Figure 13 shows the typical ground current consumption for various load levels at an input voltage of 2.3 V. 30 VOUT = 1.8V VIN = 2.
PAGE 8
EVAL-ADP121 ORDERING INFORMATION BILL OF MATERIALS Table 2. Qty 2 1 1 Reference Designator C1, C2 J1 or J2 U1 Description Capacitor, MLCC, 1 μF, 10 V, 0402, X5R Header, single, STR, 2 pins IC, LDO regulator Manufacturer/Vendor Murata or equivalent Digi-Key Corp. Analog Devices, Inc. Vendor Part No. GRM155R61A105KE15 S1012E-36-ND ADP121-AUJZ33R7 ADP121-AUJZ30R7 ADP121-AUJZ28R7 ADP121-ACBZ33R7 ADP121-ACBZ30R7 ADP121-ACBZ28R7 ADP121-ACBZ20R7 ADP121-ACBZ18R7 ORDERING GUIDE Model ADP121-3.3-EVALZ1 ADP121-3.