LT3475IFE-1#TRPBF datasheet, PDF

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LT3475IFE-1#TRPBF: DescriptionIC LED DRIVER RGLTR DIM 20TSSOP; CategoryAnalog mixed-signal IC Drivers and interfaces; File Size142KB，4 Pages; ManufacturerLinear ( ADI ); Websitehttp://www.analog.com/cn/index.html; Environmental Compliance

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LT3475IFE-1#TRPBF Overview

IC LED DRIVER RGLTR DIM 20TSSOP

LT3475IFE-1#TRPBF Parametric

Parameter Name	Attribute value
Brand Name	Linear Technology
Is it Rohs certified?	conform to
Maker	Linear ( ADI )
Parts packaging code	TSSOP
package instruction	HTSSOP,
Contacts	20
Manufacturer packaging code	FE
Reach Compliance Code	compliant
ECCN code	EAR99
Interface integrated circuit type	LED DISPLAY DRIVER
JESD-30 code	R-PDSO-G20
JESD-609 code	e3
length	6.5 mm
Humidity sensitivity level	1
Multiplex display function	NO
Number of functions	2
Number of segments	1
Number of terminals	20
Maximum operating temperature	125 °C
Minimum operating temperature	-40 °C
Package body material	PLASTIC/EPOXY
encapsulated code	HTSSOP
Package shape	RECTANGULAR
Package form	SMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH
Peak Reflow Temperature (Celsius)	260
Certification status	Not Qualified
Maximum seat height	1.2 mm
Maximum supply voltage	36 V
Minimum supply voltage	4 V
Nominal supply voltage	12 V
surface mount	YES
Temperature level	AUTOMOTIVE
Terminal surface	Matte Tin (Sn)
Terminal form	GULL WING
Terminal pitch	0.65 mm
Terminal location	DUAL
Maximum time at peak reflow temperature	30
width	4.4 mm

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QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1315

DUAL STEP-DOWN 1.5A LED DRIVER

LT3475-1

DESCRIPTION

Demonstration circuit 1315 features the

LT®3475-1 dual step-down 1.5A LED driver in a

16-lead TSSOP thermally enhanced package.

The demonstration circuit is designed to drive

two 1.5A LED strings (one on each channel)

from a high input voltage. The high switching

frequency scheme permits the use of a small

inductor and ceramic capacitors to save space

and cost. The current mode PWM control

scheme provides fast transient response and

cycle-by-cycle current limiting. DC1315 is

specifically designed for high power LED

applications such as automotive and avionic

lighting, architectural detail lighting and display

backlighting. See the LT3475-1 datasheet for

more detailed information on LED brightness

and dimming control using both the PWM pin

function and the V

ADJ

pin function. The PWM

terminals can be used to dim the LEDs with the

addition of a PWM MOSFET and the resistor-

short connection from LED- to GND removed.

The efficiency of DC1315A with 20V input and 4

white LEDs on each 1.5A channel is 91.5%.

The input voltage is limited to 30V during

startup. During normal (non-startup) operation,

the input voltage can be as high as 36V.

DC1315 allows LED string voltages up to 23V.

However, some combinations of VIN, VLED,

and ILED can result in the LT3475-1 getting hot.

Please consult the datasheet for thermal calcu-

lations and details. The voltages, the LED cur-

rent, and the switching frequency can be ad-

justed for optimal thermal performance.

NOTE:

Design files for this circuit board are avail-

able. Call the LTC factory.

LT is a registered trademark of Linear Technology Corporation

QUICK START PROCEDURE

DC1315 is easily set up for evaluating the

LT3475-1 dual step-down 1.5A LED driver

circuit. Follow the test procedure outlined below

and see Figure 1.

1. Connect a bench supply with power OFF

to the V

and GND terminals.

2. Connect a 1.5A LED string with forward

voltage >13V to the LED1+ and LED1-

terminals.

3. Connect a 1.5A LED string with forward

voltage >13V to the LED2+ and LED2-

terminals.

The boost circuitry on DC1315 is de-

signed to work best with VLED >13V since

there is a 9V zener diode limiting the boost

voltage. If lower voltage LED strings are re-

quired, please lower the voltage of the zener

NOTE:

diode or use another boost method. Please

see the datasheet for details.

4. Turn on the input power supply and set

the voltage above the LED string voltage

and below 30V.

5. Observe the LEDs working properly at

1.5A without looking straight at the LEDs.

The brightness is harmful to the eye.

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Description	IC LED DRIVER RGLTR DIM 20TSSOP	eval board led driver lt3475-1	IC LED DRIVER RGLTR DIM 20TSSOP	IC LED DRIVER RGLTR DIM 20TSSOP	IC LED DRIVER RGLTR DIM 20TSSOP	IC LED DRIVER RGLTR DIM 20TSSOP	IC LED DRIVER RGLTR DIM 20TSSOP	IC LED DRIVER RGLTR DIM 20TSSOP
Brand Name	Linear Technology	-	Linear Technology	Linear Technology	Linear Technology	Linear Technology	Linear Technology	Linear Technology
Is it Rohs certified?	conform to	-	conform to	conform to	conform to	conform to	conform to	conform to
Maker	Linear ( ADI )	-	Linear ( ADI )	Linear ( ADI )	Linear ( ADI )	Linear ( ADI )	Linear ( ADI )	Linear ( ADI )
Parts packaging code	TSSOP	-	TSSOP	TSSOP	TSSOP	TSSOP	TSSOP	TSSOP
package instruction	HTSSOP,	-	HTSSOP,	HTSSOP,	HTSSOP,	HTSSOP,	HTSSOP,	HTSSOP,
Contacts	20	-	20	20	20	20	20	20
Manufacturer packaging code	FE	-	FE	FE	FE	FE	FE	FE
Reach Compliance Code	compliant	-	compliant	compliant	compliant	compliant	compliant	compliant
ECCN code	EAR99	-	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99
Interface integrated circuit type	LED DISPLAY DRIVER	-	LED DISPLAY DRIVER	LED DISPLAY DRIVER	LED DISPLAY DRIVER	LED DISPLAY DRIVER	LED DISPLAY DRIVER	LED DISPLAY DRIVER
JESD-30 code	R-PDSO-G20	-	R-PDSO-G20	R-PDSO-G20	R-PDSO-G20	R-PDSO-G20	R-PDSO-G20	R-PDSO-G20
JESD-609 code	e3	-	e3	e3	e3	e3	e3	e3
length	6.5 mm	-	6.5 mm	6.5 mm	6.5 mm	6.5 mm	6.5 mm	6.5 mm
Humidity sensitivity level	1	-	1	1	1	1	1	1
Multiplex display function	NO	-	NO	NO	NO	NO	NO	NO
Number of functions	2	-	2	2	2	2	2	2
Number of segments	1	-	1	1	1	1	1	1
Number of terminals	20	-	20	20	20	20	20	20
Maximum operating temperature	125 °C	-	125 °C	85 °C	85 °C	125 °C	125 °C	85 °C
Minimum operating temperature	-40 °C	-	-40 °C	-40 °C	-40 °C	-40 °C	-40 °C	-40 °C
Package body material	PLASTIC/EPOXY	-	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY
encapsulated code	HTSSOP	-	HTSSOP	HTSSOP	HTSSOP	HTSSOP	HTSSOP	HTSSOP
Package shape	RECTANGULAR	-	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR
Package form	SMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH	-	SMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH	SMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH	SMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH	SMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH	SMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH	SMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH
Peak Reflow Temperature (Celsius)	260	-	260	260	260	260	260	260
Certification status	Not Qualified	-	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified
Maximum seat height	1.2 mm	-	1.2 mm	1.2 mm	1.2 mm	1.2 mm	1.2 mm	1.2 mm
Maximum supply voltage	36 V	-	36 V	36 V	36 V	36 V	36 V	36 V
Minimum supply voltage	4 V	-	4 V	4 V	4 V	4 V	4 V	4 V
Nominal supply voltage	12 V	-	12 V	12 V	12 V	12 V	12 V	12 V
surface mount	YES	-	YES	YES	YES	YES	YES	YES
Temperature level	AUTOMOTIVE	-	AUTOMOTIVE	INDUSTRIAL	INDUSTRIAL	AUTOMOTIVE	AUTOMOTIVE	INDUSTRIAL
Terminal surface	Matte Tin (Sn)	-	Matte Tin (Sn)	Matte Tin (Sn)	Matte Tin (Sn)	Matte Tin (Sn)	Matte Tin (Sn)	Matte Tin (Sn)
Terminal form	GULL WING	-	GULL WING	GULL WING	GULL WING	GULL WING	GULL WING	GULL WING
Terminal pitch	0.65 mm	-	0.65 mm	0.65 mm	0.65 mm	0.65 mm	0.65 mm	0.65 mm
Terminal location	DUAL	-	DUAL	DUAL	DUAL	DUAL	DUAL	DUAL
Maximum time at peak reflow temperature	30	-	30	30	30	30	30	30
width	4.4 mm	-	4.4 mm	4.4 mm	4.4 mm	4.4 mm	4.4 mm	4.4 mm

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