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Evaluation Board User Guide

UG-279

One Technology Way • P. O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Te l: 781.329.4700 • Fax: 781.461.3113 • www.analog.com

Evaluation Board for the ADP5033 Micro PMU

PLEASE SEE THE LAST PAGE FOR AN IMPORTANT

WARNING AND LEGAL TERMS AND CONDITIONS.

Rev. 0 | Page 1 of 12

FEATURES

Full-featured evaluation board for the ADP5033

Standalone capability

Simple device measurements, including line and load

regulation, demonstrable with

A voltage supply

A voltmeter

An ammeter

Load resistors

Easy access to external components

Cascading options to supply the LDO from either buck

Dedicated enable option for each channel

Mode option to change bucks from PSM to PWM operation

DOCUMENTS NEEDED

ADP5033 data sheet

GENERAL DESCRIPTION

The ADP5033 evaluation board is a two-step-down regulator with

a two-LDO solution that enables evaluation of the ADP5033.

The evaluation board is available in standard voltage options.

The ADP5033 uses a proprietary high speed, current mode,

constant frequency PWM control scheme for excellent stability

and transient response. To ensure the longest battery life in

portable applications, the ADP5033 features a power save mode

(PSM) that reduces the switching frequency under light load

conditions, as well as the option to change the mode to fixed

PWM operation. The 3 MHz switching frequency minimizes

the size of the external components.

The low quiescent current, low dropout voltage, and wide input

voltage range of the ADP5033 LDO extends the battery life of

portable devices.

Full details on the ADP5033 are provided in the ADP5033 data

sheet available from Analog Devices, Inc., which should be

consulted in conjunction with this evaluation board user guide.

TOP LAYER OF THE EVALUATION BOARD

09879-010

Figure 1. Top Layer, Recommended Layout

Summary of content (12 pages)

PAGE 1
Evaluation Board User Guide UG-279 One Technology Way • P.O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Tel: 781.329.4700 • Fax: 781.461.3113 • www.analog.
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UG-279 Evaluation Board User Guide TABLE OF CONTENTS Features .............................................................................................. 1 Measuring Evaluation Board Performance ...................................3 Documents Needed.......................................................................... 1 Measuring Output Voltage ...............................................................6 General Description ....................................................................
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Evaluation Board User Guide UG-279 USING THE EVALUATION BOARD POWERING UP THE EVALUATION BOARD Input and Output Voltmeters The ADP5033 evaluation board is supplied fully assembled and tested. Before applying power to the evaluation board, follow the procedures in this section. Measure the input and output voltages with voltmeters. Make sure that the voltmeters are connected to the appropriate evaluation board terminals and not to the load or power source themselves.
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UG-279 Evaluation Board User Guide 100 Measuring Load Regulation 3.325 VIN = 5V VOUT = 3.3V 3.320 90 PSM 80 70 EFFICIENCY (%) Test the load regulation by increasing the load at the output and looking at the change in output voltage. To minimize voltage drop, use short low resistance wires, especially for loads approaching maximum current. 60 50 40 30 PWM 10 3.310 0 1 10 1000 100 IOUT (mA) 3.305 09879-004 VOUT (V) VIN = 5V VOUT = 3.3V 20 3.315 Figure 4.
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Evaluation Board User Guide UG-279 Load Regulation of LDO Dropout Voltage of LDO For load regulation measurements, the regulator output is monitored while the load is varied. For good load regulation, the output must change as little as possible with varying loads. The input voltage must be held constant during this measurement. The load current can be varied from 0 mA to 150 mA. Figure 6 shows the typical load regulation performance of the LDO with fixed 2.8 V output for an input voltage of 3.3 V. 2.
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UG-279 Evaluation Board User Guide MEASURING OUTPUT VOLTAGE Figure 7 shows 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.
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Evaluation Board User Guide UG-279 MEASURING GROUND CURRENT Figure 8 shows 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. Ensure that the resistor has a power rating that is adequate to handle the power VOLTAGE SOURCE 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.
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UG-279 Evaluation Board User Guide EVALUATION BOARD SCHEMATICS AND ARTWORK J1 VIN_1 U1 ADP5033 VIN1 C1 C5 4.7uF C0402std C4 A2 VIN2 A3 C6 4.
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UG-279 09879-012 Evaluation Board User Guide 09879-013 Figure 11. Third Layer, Recommended Layout Figure 12. Bottom Layer, Recommended Layout Rev.
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UG-279 Evaluation Board User Guide ORDERING INFORMATION BILL OF MATERIALS Table 1. Qty. 1 2 3 2 2 Reference Designator U1 C5, C6 C7, C4, COUT_3, COUT_4 COUT_2, COUT_1 L1, L2 Description ADP5033 micro PMU—4 regulators Capacitor, MLCC, 4.7 μF, 6.3 V, 0402, X5R Capacitor, MLCC, 1.0 μF, 6.3 V, 0402, X5R Capacitor, MLCC, 10.0 μF, 6.3 V, 0603, X5R Inductor, 1.0 μH, 0.29 A, 90 mΩ Rev.
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Evaluation Board User Guide UG-279 NOTES Rev.
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UG-279 Evaluation Board User Guide NOTES 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.