IS31LT3360-SDLS3-TR Datasheet IS31LT3360-SDLS3-TR, IS31LT3360-SDLS4-TR | P1-P3

IS31LT3360

Integrated Silicon Solution, Inc. – www.issi.com 1

Rev. C, 12/22/2013

40V/1.2A LED DRIVER WITH INTERNAL SWITCH

January 2014

GENERAL DESCRIPTION

The IS31LT3360 is a continuous mode inductive

step-down converter, designed for driving a single

LED or multiple series connected LEDs efficiently

from a voltage source higher than the LED voltage.

The chip operates from an input supply between 6V

and 40V and provides an externally adjustable output

current of up to 1.2A.

The IS31LT3360 includes an integrated output

switch and a high-side output current sensing circuit,

which uses an external resistor to set the nominal

average output current.

Output current can be adjusted linearly by applying

an external control signal to the ADJ pin. The ADJ

pin will accept either a DC voltage or a PWM

waveform. This will provide either a continuous or a

gated output current.

Applying a voltage less than 0.2V to the ADJ pin

turns the output off and switches the chip into a low

current standby state.

The chip is assembled in SOT89-5 package. It

operates from 6V to 40V over two temperature

ranges of -40°C to +105°C and -40°C to +125°C.

FEATURES

 Up to 1.2A output current

 High efficiency (up to 98%)

 Wide input voltage range: 6V ~ 40V

 Internal 40V power switch

 Simple low parts count

 Typical 3% output current accuracy (-40°C to

+105°C, IS31LT3360-SDLS3-TR)

 Typical 5% output current accuracy (-40°C to

+125°C, IS31LT3360-SDLS4-TR)

 Single pin on/off and brightness control using

DC voltage or PWM

 Up to 1MHz switching frequency

 Inherent LED open-circuit/short-circuit

protection

 Thermal shutdown protection circuitry

 Up to 1200: 1 dimming ratio

APPLICATIONS

 Automotive and avionic lighting

 LED MR16, MR11 spot light

 LED street light

 PAR light

 Industrial lighting

 Refrigeration lights

 Other LED lighting

APPLICATION CIRCUIT

Figure 1 Typical Application Circuit

Note: The capacitor, C

, can’t be removed. And it should be placed as close as possible to the VIN and GND pins, otherwise the

operation might be abnormal.

IS31LT3360

Integrated Silicon Solution, Inc. – www.issi.com 2

Rev. C, 12/22/2013

PIN CONFIGURATION

Package Pin Configuration

SOT89-5

ADJ ISENSE

VIN

GND

Thermal Pad

PIN DESCRIPTION

No. Pin Description

1 LX Drain of power switch.

2 GND Ground (0V).

3 ADJ

Multi-function On/Off and brightness control pin:

* Leave floating for normal operation.(V

ADJ

= V

REF

= 1.2V giving

nominal average output current I

OUT(NOM)

=0.1/R

)

* Drive to voltage below 0.2V to turn off output current

* Drive with DC voltage (0.3V<V

ADJ

<1.2V) to adjust output

current from 25% to 100% of I

OUT_NOM

* Drive with PWM signal to adjust output current.

* When driving the ADJ pin above 1.2V, the current will be

clamped to 100% brightness automatically.

4 ISENSE

Connect resistor R

from this pin to V

to define nominal

average output current I

OUT_NOM

=0.1/R

5 VIN

Input voltage (6V ~ 40V). Decouple to ground with 0.1F X7R

ceramic capacitor as close to device as possible.

Thermal Pad Connect to GND.

IS31LT3360

Integrated Silicon Solution, Inc. – www.issi.com 3

Rev. C, 12/22/2013

ORDERING INFORMATION

Industrial Range: -40°C to +105°C

Order Part No. Package QTY/Reel

IS31LT3360-SDLS3-TR SOT89-5, Lead-free 2500

Industrial Range: -40°C to +125°C

Order Part No. Package QTY/Reel

IS31LT3360-SDLS4-TR SOT89-5, Lead-free 2500

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advisedto

obtainthelatestversionofthisdevicespecificationbeforerelyingonanypublishedinformationandbeforeplacingordersforproducts.

IntegratedSiliconSolution,Inc.doesnotrecommendtheuseofanyofitsproductsinlifesupportapplicationswherethefailureormalfunctionofthe

productcanreasonablybeexpected

tocausefailureofthelifesupportsystemortosignificantlyaffectitssafetyoreffectiveness.Productsarenot

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b.)theuserassume

allsuchrisks;and

c.)potentialliabilityofIntegratedSiliconSolution,Incisadequatelyprotectedunderthecircumstances

P1-P3 P4-P6 P7-P9 P10-P12 P13-P15

IS31LT3360-SDLS3-TR

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Buy IS31LT3360-SDLS3-TR

Manufacturer:

ISSI

Description:

LED Lighting Drivers 40V/1.2A LED Drvr w/ switch dimming

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New from this manufacturer.

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IS31LT3360-SDLS3-TR

IS31LT3360-SDLS3-TR

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