Analog Devices DC456 Manual de usuario

LTC3412 DC456 Description

DC456 is a high efficiency, high frequency buck converter, incorporating

the LTC3412 monolithic synchronous regulator. The DC456 has an input

voltage range of 2.5V to 5.5V and an output voltage range from 0.8V to

5V. The operating frequency range of the DC456 is either set with an

external resistor or synchronized to an external clock, with a range

between 100 kHz and 1.5 MHz. Due to these features, the DC456 is ideal

for Li-Ion battery voltage (2.7V to 4.2V) applications, such as PDAs,

cellular phones, and digital cameras. The DC456 can deliver high(er)

power – up to 2A of output current – in a relatively small circuit, because

of the high current power switches (80 mΩof on-state resistance) on the

LTC3412. The LTC3412 also incorporates OPTI-LOOP compensation, so

that the DC456 can be optimized to provide fast transient response over a

wide range of line and load conditions. All these features make the

DC456 perfectly suited for battery-powered, hand-held applications.

Design files for this circuit are available. Call the LTC Factory.

LTC3412 DC456 Quick Start Guide

Demonstration circuit 456 is easy to set up to evaluate the performance of the

LTC3412. Please follow the procedure outlined below for proper operation.

1. Select the desired output voltage using jumpers JP1 thru JP4. The

fixed output voltages are 1.8V, 2.5V, and 3.3V (as shown). There is

also an option to set the output voltage to a custom value by inserting

a resistor into the R6 pads next to jumper JP4. Refer to figure 1 for the

proper circuit setup.

2. Connect the input power supply to the Vin and GND terminals on the

top right-side of the board. Do not hot-plug Vin or increase Vin over

the rated maximum supply voltage of 5.5V, or the part may be

damaged. Refer to figure 1 for the proper measurement equipment

setup.

3. Connect the load between the Vout and GND terminals on the bottom

right-side of the board.

4. Select the desired operating mode using J1. To select Force

Continuous mode, tie the SYNC/Mode pin to Vin by inserting the

jumper into the lower position. Inserting the jumper into the upper

position selects Burst Modeoperation.

5. To shut down the circuit, connect the Run pin to GND by inserting a

jumper into the upper position of J2.

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