Datasheet

ManualsBrandsANALOG DEVICES ManualsDev KitsPCB design board

Evaluation Board User Guide

UG-270

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 800 mA, 3 MHz Buck Regulator

PLEASE SEE THE LAST PAGE FOR AN IMPORTANT

WARNING AND LEGAL TERMS AND CONDITIONS.

Rev. 0 | Page 1 of 8

FEATURES

Full-featured evaluation board for the ADP2147

Standalone capability

Simple device measurements, including line and load

regulation, demonstrable with

A single voltage supply (added indent)

A voltmeter

A current meter

Load resistors

Easy access to external components

GENERAL DESCRIPTION

The ADP2147 is a high efficiency, low quiescent current,

synchronous, step-down, dc-to-dc converter.

The buck regulator automatically switches operating modes,

depending on the load current level. At higher output loads, the

buck regulator operates in PWM mode. When the load current

falls below a predefined threshold, the regulators operate in

power save mode (PSM), improving the light-load efficiency.

The output voltage can be changed between two different

settings under the control of a VSEL pin.

The 3 MHz switching frequency minimizes the size of external

components. Full details on the ADP2147 are provided in the

ADP2147 data sheet available from Analog Devices, Inc., which

should be consulted in conjunction with thisuser guide.

DIGITAL PICTURE OF THE EVALUATION BOARD

09807-001

Figure 1.

Summary of content (8 pages)

PAGE 1
Evaluation Board User Guide UG-270 One Technology Way • P.O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Tel: 781.329.4700 • Fax: 781.461.3113 • www.analog.
PAGE 2
UG-270 Evaluation Board User Guide TABLE OF CONTENTS Features .............................................................................................. 1 Powering Up the Evaluation Board ............................................3 General Description ......................................................................... 1 Measuring Evaluation Board Performance ...................................3 Digital Picture of the Evaluation Board.........................................
PAGE 3
Evaluation Board User Guide UG-270 USING THE EVALUATION BOARD POWERING UP THE EVALUATION BOARD Turning On the Evaluation Board The ADP2147 evaluation board is supplied fully assembled and tested. Before applying power to the evaluation board, follow the procedures in this section. After the power source and load are connected to the ADP2147 evaluation board, the board can be powered for operation. To do this, perform the following steps: Jumper JP3 (ENABLE) 1. 2.
PAGE 4
UG-270 Evaluation Board User Guide EVALUATION BOARD SCHEMATIC AND LAYOUTS VIN GND CONN PWR 2-P 2 1 VIN VIN J6 1 VIN 3 CIN JP3 3 2 1 L1 ADP2147 TB1 VIN 3 2 1 4 4.7µF EN 5 VIN SW 2 1 TB3 2 VOUT 1µH GND EN VOUT 6 COUT 4.7µF VSEL U1 ENABLE JP2 3 2 1 VSEL 3 2 1 GND TB4 TB5 GND IN 09807-002 GND OUT 09807-003 09807-004 Figure 2. Evaluation Board Schematic Figure 4. Evaluation Board, Bottom Layer Figure 3. Evaluation Board, Top Layer Rev.
PAGE 5
Evaluation Board User Guide UG-270 ORDERING INFORMATION BILL OF MATERIALS Table 1. Quantity 1 1 1 1 Reference Designator U1 CIN COUT L1 Description ADP2147 buck regulator Capacitor, MLCC, 4.7 μF, 6.3 V, 0603, X5R Capacitor, MLCC, 4.7 μF, 6.3 V, 0603, X5R Inductor, 1 μH, 1.4 A, 85 mΩ Rev. 0 | Page 5 of 8 Manufacturer Analog Devices Murata Manufacturing Co., Ltd Murata Manufacturing Co., Ltd Murata Manufacturing Co.
PAGE 6
UG-270 Evaluation Board User Guide NOTES Rev.
PAGE 7
Evaluation Board User Guide UG-270 NOTES Rev.
PAGE 8
UG-270 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.