LT3492EUFDTRPBF datasheet(10/20 Pages) LINER

Part #	LT3492EUFDTRPBF

Description	Triple Output LED Driver with 3000:1 PWM Dimming

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Manufacturer	LINER [Linear Technology]

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LT3492

10

3492f

Table 1. Ceramic Capacitor Manufacturers

VENDOR

TYPE

SERIES

Taiyo Yuden

Ceramic

X5R, X7R

AVX

Ceramic

X5R, X7R

Murata

Ceramic

X5R, X7R

Kemet

Ceramic

X5R, X7R

TDK

Ceramic

X5R, X7R

Inductor Selection

Inductor value is selected based on switching frequency

and desired transient response. The data sheet applica-

tions show appropriate selections for a 1.3MHz switching

frequency. Proportionately higher values may be used if a

lower switching frequency is selected.

Several inductors that work well with the LT3492 are listed

in Table 2. However, there are many other manufacturers

and devices that can be used. Consult each manufacturer

for more detailed information and their entire range of

parts. Ferrite core inductors should be used to obtain the

best efﬁciency. Choose an inductor that can handle the

necessary peak current without saturating, and ensure that

the inductor has a low DCR (copper-wire resistance) to

minimize I2R power losses. An inductor with a magnetic

shield should be used to prevent noise radiation and cross

coupling among the three channels.

Diode Selection

The Schottky diode conducts current during the interval

when the switch is turned off. Select a diode VR rated

for the maximum SW voltage. It is not necessary that

the forward current rating of the diode equal the switch

current limit. The average current, IF, through the diode

is a function of the switch duty cycle. Select a diode with

forward current rating of:

IF = IL • (1 – D)

where IL is the inductor current.

If using the PWM feature for dimming, it is important to

consider diode leakage, which increases with the tem-

perature from the output during the PWM low interval.

Therefore, choose the Schottky diode with sufﬁcient low

leakage current at hot temperature. Table 3 shows several

Schottky diodes that work well with the LT3492.

APPLICATIONS INFORMATION

Table 2. Surface Mount Inductors

PART NUMBER

VALUE

(μH)

DCR

(

Ω MAX) IRMS (A)

SIZE

W

× L × H (mm3)

Sumida

CDRH4D28

15

0.149

0.76

5.0

× 5.0 × 3.0

CDRH5D28

22

0.122

0.9

6.0

× 6.0 × 3.0

33

0.189

0.75

CooperET

SD20

15

0.1655

1.25

5.0

× 5.0 × 2.0

22

0.2053

1.12

SD25

33

0.2149

1.11

5.0

× 5.0 × 2.5

Taiyo Yuden

NP04SZB

15

0.180

0.95

4.0

× 4.0 × 1.8

22

0.210

0.77

TDK

VLF5014A

15

0.32

0.97

4.5

× 4.7 × 1.4

22

0.46

0.51

Würth Electronics

7447789133

33

0.24

1.22

7.3

× 7.3 × 3.2

Coilcraft

M556132

22

0.19

1.45

6.1

× 6.1 × 3.2

Table 3. Schottky Diodes

PART NUMBER

VR (V)

IF (A)

PACKAGE

ZETEX

ZLLS350

40

0.38

SOD523

ZLLS400

40

0.52

SOD323

DIODES

B1100

100

1.0

SMA

ROHM

RB160M-60

60

1.0

PMDU/SOD-123

Undervoltage Lockout

The LT3492 has an undervoltage lockout circuit that

shuts down all the three converters when the input volt-

age drops below 2.1V. This prevents the converter from

switching in an erratic mode when powered from a low

supply voltage.

Programming the LED Current

An important consideration when using a switch with a

ﬁxed current limit is whether the regulator will be able to

supply the load at the extremes of input and output voltage

range. Several equations are provided to help determine

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