LX1732 データシートの表示（PDF） - Microsemi Corporation

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LX1732

High Current PFM Boost Converter

Microsemi Corporation 

INTEGRATED PRODUCTS

LX1732

High Current PFM Boost Converter

PRODUCTION DATA SHEET

EVALUATION BOARD

OVERVIEW

The LXE1732 evaluation board is available from

Microsemi for assessing overall circuit performance. The

evaluation board, shown in Figure 6, is 3 by 3 inches (i.e.,

7.6 X 7.6cm) square and factory calibrated for optimal

performance over a wide load range. Circuit designers can

easily modify output voltage to suit their particular

application. Moreover, inductor, capacitors, and diode are

easily swapped out to promote design verification of a

circuit that maximizes efficiency and minimizes cost for a

wide variety of applications. The input and output

connections are described in Table 1.

Hence, VOUT during shutdown will be approximately the

input voltage minus the inductor and diode forward voltage

drop.

The LXE1732 evaluation board provides an easy and

cost effective solution for evaluation of the LX1732. The

factory installed component list for the evaluation board is

provided in Table 2 and the schematic is shown in Figure 7.

ELECTRICAL CONNECTIONS

Apply the DC input voltage directly to the VIN pin and

connect the test load to the VOUT pin. The output voltage

is factory programmed at 3.0V, however, the user may

adjust this value by changing the R1 and R2 values

accordingly. Install a wire loop at JU1 to close the circuit

connection and to examine the inductor current using a

suitable current probe.

The LX1732 exhibits a low quiescent current (IQ <

1µA: typ) during shutdown mode. This pin is pulled-up to

VIN via a 10K resistor. Grounding the SHDN test point

shuts down the IC however, the load is still capable of

drawing current through the inductor & diode circuit path.

Figure 6 – LX1732 Evaluation Board

Pin

Name

VIN

LBI

LBO

/SHDN

VOUT

GND

Allowable

Range

0 to 6V

V < VIN

N/A

0 to VIN

V > VIN

0V

Table 1: Input and Output Pin Assignments

Description

Input power supply connection.

Low Battery Input voltage threshold sense pin: Programmed for 0.93V

nominal.

Low Battery Output voltage: Connect a DVM to LBO to observe voltage.

Ground to inhibit the LX1732

Programmed for 3.0V nominal output, adjustable via R1 and R2.

Circuit Ground

Copyright © 2000

Rev. 1.1c, 2005-03-03

Microsemi

Integrated Products

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570

Page 7

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