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Evaluation Board User Guide

UG-300

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

Evaluating the ADP2126 Ultralow Profile, 6 MHz, Step-Down Converter

PLEASE SEE THE LAST PAGE FOR AN IMPORTANT

WARNING AND LEGAL TERMS AND CONDITIONS.

Rev. A | Page 1 of 8

FEATURES

500 mA, 6 MHz, synchronous, step-down dc-to-dc converter

Low profile, tiny footprint ceramic inductor and capacitors

0.33 mm (maximum) height solution

Input voltage range: 2.1 V to 5.5 V

1.20 V fixed output voltage

EXTCLK pin compatible with clock and logic enable control

GENERAL DESCRIPTION

The ADP2126 evaluation board is a complete 6 MHz, low

quiescent current, synchronous buck dc-to-dc converter solution

that is capable of producing up to 500 mA of output current at

a fixed 1.20 V output voltage. The converter operates with an

input voltage in the 2.1 V to 5.5 V range. At high load currents, the

device uses a voltage regulating pulse-width modulation (PWM)

mode that maintains a constant frequency with excellent stability

and transient response. For light load currents, the state of the

MODE pin determines the operating mode of the converter. In

forced PWM mode, the converter continues operating in PWM

for light loads. In auto mode, the ADP2126 can automatically enter

a power saving mode that utilizes pulse-frequency modulation

(PFM) to reduce the effective switching frequency and ensure

the longest battery life in portable applications.

The evaluation board demonstrates the operation and

performance of the ADP2126, as well as its compatibility with

tiny ceramic components for a small area solution.

This user guide includes I/O descriptions, setup instructions,

the evaluation board schematic, and printed circuit board

(PCB) layout drawings for the ADP2126 low profile step-down

switching converter evaluation board.

Complete specifications for the ADP2126 can be found in the

ADP2126 data sheet available from Analog Devices, Inc., and

should be consulted in conjunction with this user guide when

using the evaluation board.

APPLICATION CIRCUIT

B2 A1

VIN

GND FB

EXTCLK MODE

2.2µF

OUT

2.2µF

INPUT

VOLTAGE

2.1V TO 5.5V

1.0µH

ADP2126

OUTPUT

VOLTAGE

1.20V

OFF ON

OFF

AUTO

PWM

10013-001

Figure 1. ADP2126 0.33 mm Maximum Height Solution

Summary of content (8 pages)

PAGE 1
Evaluation Board User Guide UG-300 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 Evaluating the ADP2126 Ultralow Profile, 6 MHz, Step-Down Converter forced PWM mode, the converter continues operating in PWM for light loads.
PAGE 2
UG-300 Evaluation Board User Guide TABLE OF CONTENTS Features .............................................................................................. 1 Evaluation Setup............................................................................3 General Description ......................................................................... 1 Performance Evaluation ...............................................................3 Application Circuit .................................................
PAGE 3
Evaluation Board User Guide UG-300 EVALUATION BOARD OVERVIEW The ADP2126 evaluation board is fully assembled and tested. The following sections describe the various connectors on the board, the proper evaluation setup, and the testing capabilities of the evaluation board. INPUT/OUTPUT CONNECTORS MODE Jumper The MODE connector controls the operating mode of the ADP2126. Use a jumper to connect the center pin to GND or VIN.
PAGE 4
UG-300 Evaluation Board User Guide Load Transient Oscillator Frequency Generate a fast transient in the current applied to VOUT and observe the behavior of the evaluation board at the SW test point and the VOUT test bus. To see the most accurate load transient waveform, place a probe directly on the output capacitor terminal with a short path to ground to limit noise and stray inductance. The oscillator frequency is measured by connecting an oscilloscope to the SW test point.
PAGE 5
Evaluation Board User Guide UG-300 EVALUATION BOARD SCHEMATIC AND LAYOUT MODE VIN VOUT 1.20V SW EXTCLK VIN (2.1V TO 5.5V) ADP2126 A1 MODE VIN A2 L1 B1 SW CIN1 EXTCLK B2 CIN2 CIN3 GND C1 FB U1 10013-003 COUT GND C2 10013-005 Figure 2. ADP2126 Evaluation Board Schematic Figure 3. ADP2126 LAYOUT GUIDELINES For high efficiency, good regulation, and stability with the ADP2126, a well-designed and manufactured PCB is essential.
PAGE 6
UG-300 Evaluation Board User Guide ORDERING INFORMATION BILL OF MATERIALS Table 1. ADP2126—0.33 mm Height Solution Quantity 1 Reference Designator U1 1 Open 1 1 2 3 1 CIN1 CIN2, CIN3 COUT L1 SW, EXTCLK VOUT, VIN, GND MODE 1 Description ADP2126 low profile, 500 mA, 6 MHz, synchronous, step-down, dc-to-dc converter Input capacitor, MLCC, 2.2 μF, 6.3 V, 0402, X5R Extra input capacitor Input capacitor, MLCC, 2.2 μF, 4 V, 0402, X5R Inductor, 1.0 μH, 0603 Headers, 0.
PAGE 7
Evaluation Board User Guide UG-300 NOTES Rev.
PAGE 8
UG-300 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.