User Guide | DC3109A

UG-2089

Evaluating the LTC3306 3.3 V to 1.2 V at 1.75 A, 2 MHz Synchronous Step-Down Regulator in an 11 mm2 Solution

PLEASE SEE THE LAST PAGE FOR AN IMPORTANT

WARNING AND LEGAL TERMS AND CONDITIONS.

Rev. 0 | 1 of 12

FEATURES

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DC3109A evaluation board

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Transient circuit included for load-transient evaluation

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EMI filter included to reduce noise in EMI emission tests

EVALUATION KIT CONTENTS

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DC3109A evaluation board

DOCUMENTS NEEDED

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LTC3306 data sheet

EQUIPMENT NEEDED

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DC voltage source

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An electronic load

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A multimeter

GENERAL DESCRIPTION

Demonstration circuit DC3109A is a 2 MHz, 2.5 V to 5.5 V input,

1.2 V/1.75 A output buck regulator, featuring the LTC3306, 1.75

A, synchronous step-down regulator in 1.6 mm x 1 mm WLCSP.

The LTC3306 is a small size, high efficiency, low noise monolithic

synchronous step-down DC-DC converter. Low minimum on-time of

22 ns enables high VIN to low VOUT conversion at high frequency.

The LTC3306 supports fixed output voltages ranging from 0.5 V to

3.65 V.

The demo circuit features the adjustable version of LTC3306. Out-

put voltage is adjusted to 1.2 V with external feedback resistors.

The DC3109A-A is set up to run in Burst Mode with LTC3306A.

The DC3109A-C is set up to run in forced continuous mode with

LTC3306C. The high precision PGOOD signal shows the status of

the output voltage.

The DC3109A also has an EMI filter to reduce the conducted EMI.

This EMI filter can be included by applying the input voltage at the

VIN EMI terminal. The EMI performance of the board is shown in the

EMI Test Results section.

Full specifications on the LTC3306 are available in the LTC3306

data sheet available from Analog Devices, Inc., and must be con-

sulted with this user guide when using the DC3109A evaluation

board. The LTC3306 is assembled in a 6-ball, 1.6 mm x 1 mm, 0.5

mm pitch WLCSP package.

OPTION TABLE

Table 1. Option Table

Demo Board

Featured IC

Operation Mode

DC3109A-A

LTC3306A

Burst

DC3109A-C

LTC3306C

Forced continuous