LT3477EUF#TRPBF datasheet, PDF

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LT3477EUF#TRPBF: DescriptionIC LED DRIVER RGLTR DIM 3A 20QFN; CategoryPower/power management The power supply circuit; File Size564KB，22 Pages; ManufacturerLinear ( ADI ); Websitehttp://www.analog.com/cn/index.html; Environmental Compliance

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LT3477EUF#TRPBF Overview

IC LED DRIVER RGLTR DIM 3A 20QFN

LT3477EUF#TRPBF Parametric

Parameter Name	Attribute value
Brand Name	Linear Technology
Is it Rohs certified?	conform to
Maker	Linear ( ADI )
Parts packaging code	QFN
package instruction	HVQCCN, LCC20,.16SQ,20
Contacts	20
Manufacturer packaging code	UF
Reach Compliance Code	compliant
ECCN code	EAR99
Analog Integrated Circuits - Other Types	SWITCHING REGULATOR
control mode	CURRENT-MODE
Control Technology	PULSE WIDTH MODULATION
Maximum input voltage	25 V
Minimum input voltage	2.5 V
Nominal input voltage	2.5 V
JESD-30 code	S-PQCC-N20
JESD-609 code	e3
length	4 mm
Humidity sensitivity level	1
Number of functions	1
Number of terminals	20
Maximum operating temperature	70 °C
Minimum operating temperature
Maximum output current	5 A
Package body material	PLASTIC/EPOXY
encapsulated code	HVQCCN
Encapsulate equivalent code	LCC20,.16SQ,20
Package shape	SQUARE
Package form	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE
Peak Reflow Temperature (Celsius)	260
Certification status	Not Qualified
Maximum seat height	0.8 mm
surface mount	YES
Switch configuration	BUCK-BOOST
Maximum switching frequency	4300 kHz
Temperature level	COMMERCIAL
Terminal surface	Matte Tin (Sn)
Terminal form	NO LEAD
Terminal pitch	0.5 mm
Terminal location	QUAD
Maximum time at peak reflow temperature	30
width	4 mm
Base Number Matches	1

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FeaTures

LT3477

3A, DC/DC Converter

with Dual Rail-to-Rail

Current Sense

DescripTion

The

3477

is a current mode, 3A DC/DC step-up converter

with dual rail-to-rail current sense amplifiers and an internal

3A, 42V switch. It combines a traditional voltage feedback

loop and two unique current feedback loops to operate

as a constant-current, constant-voltage source. Both cur-

rent sense voltages are set at 100mV and can be adjusted

independently using the I

ADJ1

and I

ADJ2

pins. Efficiency

of up to 93% can be achieved in typical applications. The

LT3477 features a programmable soft-start function to

limit inductor current during start-up. Both inputs of the

error amplifier are available externally allowing positive

and negative output voltages (boost, inverting, SEPIC,

Flyback). The switching frequency is programmable from

200kHz to 3.5MHz through an external resistor.

Available in thermally enhanced 20-pin (4mm

4mm)

QFN and 20-pin TSSOP packages, the LT3477 provides a

complete solution for both constant-voltage and constant-

current applications.

, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

Dual 100mV Rail-to-Rail Current Sense Amplifiers

Wide Input Voltage Range: 2.5V to 25V

3A, 42V Internal Switch

High Efficiency Power Conversion: Up to 93%

Drives LEDs in Boost, Buck-Boost or Buck Mode

Frequency Set by External Resistor: 200kHz to 3.5MHz

Programmable Soft-Start

Low V

CESAT

Switch: 0.3V at 2.5A

Capable of Positive and Negative Output Voltages

(Boost, Inverting, SEPIC, Flyback)

Available in Thermally Enhanced 20-Lead

(4mm

4mm) QFN and 20-Lead TSSOP Packages

applicaTions

High Power LED Driver

DSL Modems

Distributed Power

Input/Output Current Limited Boost, SEPIC,

Inverting, Flyback Converters

Constant-Voltage, Constant-Current Source

Typical applicaTion

330mA LED Driver With Open LED Protection

10µH

3.3µF

200k

FBN

10k

LT3477

SP2

0.3

REF

FBP

GND

33nF

22k

SN2

330mA

3.3µF

Efficiency

SP1

ADJ1

ADJ2

SN1

EFFICIENCY (%)

0.1

0.2

OUT

(A)

3477 TA01b

SHDN

0.3

0.4

4.7nF

3477 TA01a

3477fd

For more information

www.linear.com/LT3477

LT3477EUF#TRPBF Related Products

	LT3477EUF#TRPBF	LT3477EUF#PBF	LT3477IUF#PBF	LT3477EFE#TRPBF	LT3477IUF#TRPBF	LT3477IFE#TRPBF	LT3477EFE#PBF	LT3477IFE#PBF
Description	IC LED DRIVER RGLTR DIM 3A 20QFN	IC LED DRIVER RGLTR DIM 3A 20QFN	IC LED DRIVER RGLTR DIM 3A 20QFN	IC LED DRVR RGLTR DIM 3A 20TSSOP	IC LED DRIVER RGLTR DIM 3A 20QFN	IC LED DRVR RGLTR DIM 3A 20TSSOP	Output current: 3A (Switch) Switching operating frequency: 200kHz ~ 3.5MHz Output type: Programmable Number of output voltage channels: 1 Function type: Step-Up Output configuration: Positive and Negative (Dual Rail) With dual-channel rail-to-rail current 3A, DC/DC converter with detection function	Output current: 2A, 1A Switching operating frequency: 200kHz ~ 3.5MHz Output type: Programmable Number of output voltage channels: 1 Function type: Step-Up Output configuration: Positive and Negative (Dual Rail)
Brand Name	Linear Technology	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	conform to
Maker	Linear ( ADI )	Linear ( ADI )	Linear ( ADI )	Linear ( ADI )	Linear ( ADI )	Linear ( ADI )	Linear ( ADI )	Linear ( ADI )
Parts packaging code	QFN	QFN	QFN	TSSOP	QFN	TSSOP	TSSOP	TSSOP
package instruction	HVQCCN, LCC20,.16SQ,20	HVQCCN, LCC20,.16SQ,20	HVQCCN, LCC20,.16SQ,20	HTSSOP, TSSOP20,.25	HVQCCN, LCC20,.16SQ,20	HTSSOP, TSSOP20,.25	HTSSOP, TSSOP20,.25	HTSSOP, TSSOP20,.25
Contacts	20	20	20	20	20	20	20	20
Manufacturer packaging code	UF	UF	UF	FE	UF	FE	FE	FE
Reach Compliance Code	compliant	compliant	compliant	compliant	compliant	compliant	compliant	compliant
ECCN code	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99
Analog Integrated Circuits - Other Types	SWITCHING REGULATOR	SWITCHING REGULATOR	SWITCHING REGULATOR	SWITCHING REGULATOR	SWITCHING REGULATOR	SWITCHING REGULATOR	SWITCHING REGULATOR	SWITCHING REGULATOR
control mode	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE
Control Technology	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION
Maximum input voltage	25 V	25 V	25 V	25 V	25 V	25 V	25 V	25 V
Minimum input voltage	2.5 V	2.5 V	2.5 V	2.5 V	2.5 V	2.5 V	2.5 V	2.5 V
Nominal input voltage	2.5 V	2.5 V	2.5 V	2.5 V	2.5 V	2.5 V	2.5 V	2.5 V
JESD-30 code	S-PQCC-N20	S-PQCC-N20	S-PQCC-N20	R-PDSO-G20	S-PQCC-N20	R-PDSO-G20	R-PDSO-G20	R-PDSO-G20
JESD-609 code	e3	e3	e3	e3	e3	e3	e3	e3
length	4 mm	4 mm	4 mm	6.5 mm	4 mm	6.5 mm	6.5 mm	6.5 mm
Humidity sensitivity level	1	1	1	1	1	1	1	1
Number of functions	1	1	1	1	1	1	1	1
Number of terminals	20	20	20	20	20	20	20	20
Maximum operating temperature	70 °C	70 °C	125 °C	70 °C	125 °C	125 °C	70 °C	125 °C
Maximum output current	5 A	5 A	5 A	5 A	5 A	5 A	5 A	5 A
Package body material	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY
encapsulated code	HVQCCN	HVQCCN	HVQCCN	HTSSOP	HVQCCN	HTSSOP	HTSSOP	HTSSOP
Encapsulate equivalent code	LCC20,.16SQ,20	LCC20,.16SQ,20	LCC20,.16SQ,20	TSSOP20,.25	LCC20,.16SQ,20	TSSOP20,.25	TSSOP20,.25	TSSOP20,.25
Package shape	SQUARE	SQUARE	SQUARE	RECTANGULAR	SQUARE	RECTANGULAR	RECTANGULAR	RECTANGULAR
Package form	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE	SMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE	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	260
Certification status	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified
Maximum seat height	0.8 mm	0.8 mm	0.8 mm	1.2 mm	0.8 mm	1.2 mm	1.2 mm	1.2 mm
surface mount	YES	YES	YES	YES	YES	YES	YES	YES
Switch configuration	BUCK-BOOST	BUCK-BOOST	BUCK-BOOST	BUCK-BOOST	BUCK-BOOST	BUCK-BOOST	BUCK-BOOST	BUCK-BOOST
Maximum switching frequency	4300 kHz	4300 kHz	4300 kHz	4300 kHz	4300 kHz	4300 kHz	4300 kHz	4300 kHz
Temperature level	COMMERCIAL	COMMERCIAL	AUTOMOTIVE	COMMERCIAL	AUTOMOTIVE	AUTOMOTIVE	COMMERCIAL	AUTOMOTIVE
Terminal surface	Matte Tin (Sn)	Matte Tin (Sn)	Matte Tin (Sn)	Matte Tin (Sn)	Matte Tin (Sn)	Matte Tin (Sn)	Matte Tin (Sn)	Matte Tin (Sn)
Terminal form	NO LEAD	NO LEAD	NO LEAD	GULL WING	NO LEAD	GULL WING	GULL WING	GULL WING
Terminal pitch	0.5 mm	0.5 mm	0.5 mm	0.65 mm	0.5 mm	0.65 mm	0.65 mm	0.65 mm
Terminal location	QUAD	QUAD	QUAD	DUAL	QUAD	DUAL	DUAL	DUAL
Maximum time at peak reflow temperature	30	30	30	30	30	30	30	30
width	4 mm	4 mm	4 mm	4.4 mm	4 mm	4.4 mm	4.4 mm	4.4 mm
Base Number Matches	1	1	1	1	1	1	1	1

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