Specification	LT3971EMSE-5#TRPBF

Current - Output	1.2 A
Frequency - Switching [Max]	2 MHz
Frequency - Switching [Min]	200 kHz
Function	Step-Down
Mounting Type	Surface Mount
Number of Outputs	1
Operating Temperature [Max]	125 °C
Operating Temperature [Min]	-40 C
Output Configuration	Positive
Package / Case	10-MSOP, 10-TFSOP, Exposed Pad
Supplier Device Package	10-MSOP-EP
Synchronous Rectifier	False
Topology	Buck
Voltage - Input (Max) [Max]	38 V
Voltage - Input (Min) [Min]	4.3 V
Voltage - Output (Min/Fixed)	5 V

LT3971 Series

38V, 1.2A, 2MHz Step-Down Regulator with 2.8μA Quiescent Current

Part	Package / Case	Operating Temperature [Min]	Operating Temperature [Max]	Voltage - Input (Min) [Min]	Number of Outputs	Frequency - Switching [Min]	Frequency - Switching [Max]	Function	Mounting Type	Voltage - Input (Max) [Max]	Voltage - Output (Min/Fixed)	Current - Output	Topology	Output Configuration	Supplier Device Package	Voltage - Output (Min/Fixed) [Min]	Output Type	Voltage - Output (Max) [Max]	Package / Case
Analog Devices Inc./Maxim Integrated LT3971EDD-3.3#TRPBF	10-WFDFN Exposed Pad	-40 C	125 °C	4.3 V	1	200 kHz	2 MHz	Step-Down	Surface Mount	38 V	3.3 V	1.2 A	Buck	Positive	10-DFN (3x3)
Analog Devices Inc./Maxim Integrated LT3971IMSE#PBF	10-MSOP 10-TFSOP Exposed Pad	-40 C	125 °C	4.3 V	1	200 kHz	2 MHz	Step-Down	Surface Mount	38 V		1.2 A	Buck	Positive	10-MSOP-EP	1.19 V	Adjustable	30 V
Analog Devices Inc./Maxim Integrated LT3971IMSE-3.3#TRPBF	10-MSOP 10-TFSOP Exposed Pad	-40 C	125 °C	4.3 V	1	200 kHz	2 MHz	Step-Down	Surface Mount	38 V	3.3 V	1.2 A	Buck	Positive	10-MSOP-EP
Analog Devices Inc./Maxim Integrated LT3971EDD#PBF	10-WFDFN Exposed Pad	-40 C	125 °C	4.3 V	1	200 kHz	2 MHz	Step-Down	Surface Mount	38 V		1.2 A	Buck	Positive	10-DFN (3x3)	1.19 V	Adjustable	30 V
Analog Devices Inc./Maxim Integrated LT3971EMSE16#TRPBF	16-TFSOP Exposed Pad	-40 C	125 °C	4.3 V	1	200 kHz	2 MHz	Step-Down	Surface Mount	38 V		1.2 A	Buck	Positive	16-MSOP-EP	1.19 V	Adjustable	30 V	0.118 in 3 mm
Analog Devices Inc./Maxim Integrated LT3971EMSE-5#TRPBF	10-MSOP 10-TFSOP Exposed Pad	-40 C	125 °C	4.3 V	1	200 kHz	2 MHz	Step-Down	Surface Mount	38 V	5 V	1.2 A	Buck	Positive	10-MSOP-EP
Analog Devices Inc./Maxim Integrated LT3971IMSE-5#TRPBF	10-MSOP 10-TFSOP Exposed Pad	-40 C	125 °C	4.3 V	1	200 kHz	2 MHz	Step-Down	Surface Mount	38 V	5 V	1.2 A	Buck	Positive	10-MSOP-EP
Analog Devices Inc./Maxim Integrated LT3971IMSE16#PBF	16-TFSOP Exposed Pad	-40 C	125 °C	4.3 V	1	200 kHz	2 MHz	Step-Down	Surface Mount	38 V		1.2 A	Buck	Positive	16-MSOP-EP	1.19 V	Adjustable	30 V	0.118 in 3 mm
Analog Devices Inc./Maxim Integrated LT3971AIMSE-5#PBF	10-MSOP 10-TFSOP Exposed Pad	-40 C	125 °C	4.3 V	1	200 kHz	2 MHz	Step-Down	Surface Mount	38 V	5 V	1.2 A	Buck	Positive	10-MSOP-EP
Analog Devices Inc./Maxim Integrated LT3971EMSE#PBF	10-MSOP 10-TFSOP Exposed Pad	-40 C	125 °C	4.3 V	1	200 kHz	2 MHz	Step-Down	Surface Mount	38 V		1.2 A	Buck	Positive	10-MSOP-EP	1.19 V	Adjustable	30 V

Pricing

Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly

Distributor	Package	Quantity	$	Updated

Digikey	N/A	4039	$ 9.27	1m+

Description

General part information

LT3971 Series

The LT3971 is an adjustable frequency monolithic buck switching regulator that accepts a wide input voltage range up to 38V. Low quiescent current design consumes only 2.8μA of supply current while regulating with no load. Low ripple Burst Mode operation maintains high efficiency at low output currents while keeping the output ripple below 15mV in a typical application. An internally compensated current mode topology is used for fast transient response and good loop stability. A high efficiency 0.33Ω switch is included on the die along with a boost Schottky diode and the necessary oscillator, control and logic circuitry. An accurate 1V threshold enable pin can be used to shut down the LT3971, reducing the input supply current to 700nA. A capacitor on the SS pin provides a controlled inrush current (soft-start). A power good flag signals when VOUTreaches 91% of the programmed output voltage. The LT3971 is available in small 10-lead MSOP and 3mm × 3mm DFN packages with exposed pads for low thermal resistance. A 16-lead MSOP is also offered which has enhanced pin-to-pin fault tolerance.VoutIoutVref AccuracyLT3971Adj1.2A2.5%LT3971-3.33.3V1.2A2.5%LT3971-55V1.2A2.5%LT3971AAdj1.3A1.5%LT3971A-55V1.3A1.5%ApplicationsAutomotive Battery RegulationPower for Portable ProductsIndustrial Supplies

Documents

Technical documentation and resources

LT3971EMSE-5#TRPBF | Datasheet

Datasheet

R530 Reliability Data

Reliability Data