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Evaluation Board User Guide

UG-504

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

Evaluation Board for the ADP2380 and ADP2381, 20 V, 4 A/6 A Synchronous

Step-Down Regulators with Low-Side Driver

PLEASE SEE THE LAST PAGE FOR AN IMPORTANT

WARNING AND LEGAL TERMS AND CONDITIONS.

Rev. 0 | Page 1 of 12

FEATURES

Input voltage: 4.5 V to 20 V

±1% output voltage accuracy

Integrated 44 mΩ high-side MOSFET

Continuous output current

4 A for the ADP2380

6 A for the ADP2381

Programmable switching frequency: 250 kHz to 1.4 MHz

Synchronizes to external clock: 250 kHz to 1.4 MHz

180° out-of-phase synchronization

Programmable UVLO

Power-good output

External compensation

Internal soft start with external adjustable option

Startup into a precharged output

GENERAL DESCRIPTION

The ADP2380/ADP2381 evaluation board is a complete, 4 A/6 A,

20 V, step-down regulator solution that allows users to evaluate

the performance of the ADP2380 and the ADP2381 with a nearly

ideal printed circuit board (PCB) layout.

The switching frequency can be programmed between 250 kHz

and 1.4 MHz, or it can be synchronized to an external clock with

a 180° phase shift, which provides the possibility for a stackable,

multiphase power solution.

The output of the ADP2380/ADP2381 evaluation board is preset

to 3.3 V, and the switching frequency is set to 500 kHz. Different

output voltage settings can be achieved by changing the appropriate

passive components. The ambient temperature operating range is

−40°C to +85°C.

Full details about the ADP2380 and ADP2381 regulators are

provided in the ADP2380 and ADP2381 data sheets, which are

available from Analog Devices, Inc. The data sheets should be

consulted in conjunction with this user guide.

DEMO BOARD

11203-001

Figure 1.

Summary of content (12 pages)

PAGE 1
Evaluation Board User Guide UG-504 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 Evaluation Board for the ADP2380 and ADP2381, 20 V, 4 A/6 A Synchronous Step-Down Regulators with Low-Side Driver FEATURES GENERAL DESCRIPTION Input voltage: 4.5 V to 20 V ±1% output voltage accuracy Integrated 44 mΩ high-side MOSFET Continuous output current 4 A for the ADP2380 6 A for the ADP2381 Programmable switching frequency: 250 kHz to 1.
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UG-504 Evaluation Board User Guide TABLE OF CONTENTS Features .............................................................................................. 1 Evaluation Board Schematics and Artwork ...................................5 General Description ......................................................................... 1 ADP2380 Schematic ......................................................................5 Demo Board .........................................................................
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Evaluation Board User Guide UG-504 USING THE EVALUATION BOARD POWERING UP MEASURING EVALUATION BOARD PERFORMANCE The ADP2380/ADP2381 evaluation board is supplied fully assembled and tested. Before applying power to the evaluation board, follow the procedures in this section. Measuring the Switching Waveform To observe the switching waveform with an oscilloscope, place the oscilloscope probe tip at Test Point J4 (SW) with the probe ground at J16 (GND).
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UG-504 Evaluation Board User Guide A standard oscilloscope probe has a long wire ground clip. For high frequency measurements, this ground clip picks up high frequency noise and injects it into the measured output ripple. Figure 2 shows an easy way to measure the output ripple properly. It requires removing the oscilloscope probe sheath and wrapping an unshielded wire around the oscilloscope probe.
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Rev. 0 | Page 5 of 12 Figure 3. Evaluation Board Schematic for the ADP2380 1 2 1 GND J16 1 C6 C5 R6 NC R4 NC 1 R7 100k 1 SY NC J9 VIN = 12V, VOUT = 3.3V, IOUT = 4A, FSW = 500kHz GND J15 GND J14 GND 1 1 10uF/25V J11 VIN J7 VIN 2 1 R1 100k 1 8 7 6 5 4 3 2 ADP2380 C11 2.2pF C10 1000pF COMP EN/ SS SY NC RT PGOOD UVLO PVIN 2 PVIN 1 BST 16 R2 0 C1 0.1uF R8 73.2k FB GND PGND VREG LD SW1 SW2 R11 2.
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Rev. 0 | Page 6 of 12 Figure 4. Evaluation Board Schematic for the ADP2381 1 2 1 GND J16 1 C6 C5 R6 NC R4 NC R7 100k 1 1 VIN = 12V, VOUT = 3.3V, IOUT = 6A, FSW = 500kHz GND J15 GND J14 GND 1 1 10uF/25V J11 VIN J7 VIN 2 1 SY NC J9 R1 100k 1 2 8 7 6 5 4 3 ADP2381 C11 2.2pF C10 680pF COMP EN/ SS SY NC RT PGOOD UVLO PVIN 2 PVIN 1 BST 16 R2 0 C1 0.1uF R8 93.1k FB GND PGND VREG LD SW1 SW2 R11 2.
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Evaluation Board User Guide UG-504 11203-005 11203-007 PCB LAYOUT Figure 7. Layer 2, Ground Plane Figure 6. Layer 3, Power Plane 11203-008 11203-006 Figure 5. Layer 1, Component Side Figure 8. Layer 4, Bottom Side Rev.
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UG-504 Evaluation Board User Guide ORDERING INFORMATION BILL OF MATERIALS Table 2. ADP2380 Bill of Materials Qty 1 1 1 1 2 2 1 1 1 1 1 1 2 2 4 1 1 1 1 Reference Designator C1 C2 C3 C4 C5, C6 C7, C12 C8 C9 C10 C11 L1 Q1 R1, R7 R2, R3 R4, R5, R6, R10 R8 R9 R11 U1 11 J1, J2, J3, J4, J7, J8, J9, J10, J11, J15, J16 J5, J6, J12, J13, J14 5 Description Capacitor, 0.1 µF, 16 V, 0603 Capacitor, 100 µF, 6.3 V, 1210 Capacitor, 47 µF, 6.
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Evaluation Board User Guide UG-504 Table 3. ADP2381 Bill of Materials Qty 1 2 1 2 2 1 1 1 1 1 1 2 2 4 1 1 1 1 Reference Designator C1 C2, C3 C4 C5, C6 C7, C12 C8 C9 C10 C11 L1 Q1 R1, R7 R2, R3 R4, R5, R6, R10 R8 R9 R11 U1 11 J1, J2, J3, J4, J7, J8, J9, J10, J11, J15, J16 J5, J6, J12, J13, J14 5 Description Capacitor, 0.1 µF, 16 V, 0603 Capacitor, 100 µF, 6.
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UG-504 Evaluation Board User Guide NOTES Rev.
PAGE 11
Evaluation Board User Guide UG-504 NOTES Rev.
PAGE 12
UG-504 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.