LT3956IUHE#TRPBF

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Analog Devices Inc./Maxim Integrated

80VIN, 80VOUTCONSTANT-CURRENT, CONSTANT-VOLTAGE CONVERTER

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LT3956IUHE#TRPBF

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Analog Devices Inc./Maxim Integrated

80VIN, 80VOUTCONSTANT-CURRENT, CONSTANT-VOLTAGE CONVERTER

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Description Specifications Series Pricing CAD Documents

Description

General part information

LT3956 Series

The LT3956 is a DC/DC converter designed to operate as a constant-current source and constant-voltage regulator. It is ideally suited for driving high current LEDs. It features an internal low side N-channel power MOSFET rated for 84V at 3.3A and driven from an internal regulated 7.15V supply. The fixed frequency, current-mode architecture results in stable operation over a wide range of supply and output voltages. A ground referenced voltage FB pin serves as the input for several LED protection features, and also makes it possible for the converter to operate as a constant-voltage source. A frequency adjust pin allows the user to program the frequency from 100kHz to 1MHz to optimize efficiency, performance or external component size.The LT3956 senses output current at the high side of the LED string. High side current sensing is the most flexible scheme for driving LEDs, allowing boost, buck mode or buck-boost mode configuration. The PWM input provides LED dimming ratios of up to 3000:1, and the CTRL input provides additional analog dimming capability.ApplicationsHigh Power LEDBattery ChargerAccurate Current Limited Voltage Regulator

Technical Specifications

Parameters and characteristics for this part

Specification	LT3956IUHE#TRPBF

Current - Output / Channel	3.3 A
Dimming	PWM, Analog
Frequency (Max)	1 MHz
Frequency (Min)	100 kHz
Internal Switch(s)	Yes
Mounting Type	Surface Mount
Number of Outputs	1
Operating Temperature (Max)	125 °C
Operating Temperature (Min)	-40 °C
Package Leads	28 Leads
Package Length	5 mm
Package Name	36-QFN, 36-WFQFN
Package Width	6 mm
Topology	Step-Up (Boost), Flyback, Step-Down (Buck), SEPIC
Type	DC DC Regulator
Voltage - Output	80 V
Voltage - Supply (Max)	80 V
Voltage - Supply (Min)	4.5 V

LT3956 Series

Part	Dimming	Frequency (Min)	Frequency (Max)	Package Width	Package Name	Package Length	Voltage - Supply (Max)	Current - Output / Channel	Topology	Number of Outputs	Voltage - Supply (Min)	Internal Switch(s)	Voltage - Output	Type	Operating Temperature (Max)	Operating Temperature (Min)	Mounting Type	Package Leads
Analog Devices Inc./Maxim Integrated LT3956IUHE#PBF	Analog PWM	100 kHz	1 MHz	6 mm	36-QFN 36-WFQFN	5 mm	80 V	3.3 A	Flyback SEPIC Step-Down (Buck) Step-Up (Boost)	1	4.5 V	Yes	80 V	DC DC Regulator	125 °C	-40 °C	Surface Mount	28 Leads
Analog Devices Inc./Maxim Integrated LT3956IUHE	Analog PWM	100 kHz	1 MHz	6 mm	36-QFN 36-WFQFN	5 mm	80 V	3.3 A	Flyback SEPIC Step-Down (Buck) Step-Up (Boost)	1	4.5 V	Yes	80 V	DC DC Regulator	125 °C	-40 °C	Surface Mount	28 Leads
Analog Devices Inc./Maxim Integrated LT3956EUHE#PBF	Analog PWM	100 kHz	1 MHz	6 mm	36-QFN 36-WFQFN	5 mm	80 V	3.3 A	Flyback SEPIC Step-Down (Buck) Step-Up (Boost)	1	4.5 V	Yes	80 V	DC DC Regulator	125 °C	-40 °C	Surface Mount	28 Leads
Analog Devices Inc./Maxim Integrated LT3956EUHE#TRPBF	Analog PWM	100 kHz	1 MHz	6 mm	36-QFN 36-WFQFN	5 mm	80 V	3.3 A	Flyback SEPIC Step-Down (Buck) Step-Up (Boost)	1	4.5 V	Yes	80 V	DC DC Regulator	125 °C	-40 °C	Surface Mount	28 Leads
Analog Devices Inc./Maxim Integrated LT3956IUHE#TRPBF	Analog PWM	100 kHz	1 MHz	6 mm	36-QFN 36-WFQFN	5 mm	80 V	3.3 A	Flyback SEPIC Step-Down (Buck) Step-Up (Boost)	1	4.5 V	Yes	80 V	DC DC Regulator	125 °C	-40 °C	Surface Mount	28 Leads

Pricing

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CAD

3D models and CAD resources for this part

Documents

Technical documentation and resources

LT3956IUHE#TRPBF | Datasheet

R518 Reliability Data