LT3991EMSE-5#PBF

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Analog Devices

DC-DC SWITCHING BUCK REGULATOR, FIXED, 4.3 TO 55V IN, 5V/1.2A OUT, MSOP-EP-10

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LT3991EMSE-5#PBF

Active

Analog Devices

DC-DC SWITCHING BUCK REGULATOR, FIXED, 4.3 TO 55V IN, 5V/1.2A OUT, MSOP-EP-10

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DocumentsDatasheet R530 Reliability Data +1

Specifications Pricing Series Description Documents

Technical Specifications

Parameters and characteristics for this part

Specification	LT3991EMSE-5#PBF

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
Output Type	1.81 mOhm
Package / Case	3 Lead, 0.118 in
Package / Case	Exposed Pad, 10-TFSOP, 10-MSOP
Supplier Device Package	10-MSOP-EP
Synchronous Rectifier	False
Topology	Buck
Voltage - Input (Min) [Min]	4.3 V
Voltage - Output (Min/Fixed)	5 V

LT3991 Series

55V, 1.2A Step-Down Regulator with 2.8μA Quiescent Current

Part	Package / Case	Package / Case	Function	Voltage - Output (Min/Fixed)	Operating Temperature [Min]	Operating Temperature [Max]	Frequency - Switching [Max]	Frequency - Switching [Min]	Supplier Device Package	Topology	Number of Outputs	Output Type	Output Configuration	Current - Output	Mounting Type	Voltage - Input (Min) [Min]	Output Type	Voltage - Output (Max) [Max]
Analog Devices LT3991EMSE-5#TRPBF	0.118 in 3 Lead	10-MSOP 10-TFSOP Exposed Pad	Step-Down	5 V	-40 °C	125 ¯C	2 MHz	200 kHz	10-MSOP-EP	Buck	1	1.81 mOhm	Positive	1.2 A	Surface Mount	4.3 V
Analog Devices LT3991EMSE#TRPBF	0.118 in 3 Lead	10-MSOP 10-TFSOP Exposed Pad	Step-Down	1.19 V	-40 °C	125 ¯C	2 MHz	200 kHz	10-MSOP-EP	Buck	1		Positive	1.2 A	Surface Mount	4.3 V	Adjustable	30 V
Analog Devices LT3991EMSE-5#PBF	0.118 in 3 Lead	10-MSOP 10-TFSOP Exposed Pad	Step-Down	5 V	-40 °C	125 ¯C	2 MHz	200 kHz	10-MSOP-EP	Buck	1	1.81 mOhm	Positive	1.2 A	Surface Mount	4.3 V
Analog Devices LT3991IDD		10-WFDFN Exposed Pad	Step-Down	1.19 V	-40 °C	125 ¯C	2 MHz	200 kHz	10-DFN (3x3)	Buck	1		Positive	1.2 A	Surface Mount	4.3 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	$

Digikey	Tube	1	$ 9.75
		10	$ 6.61
		50	$ 5.28
		100	$ 4.86
		250	$ 4.42
Newark	Each	1	$ 9.49
		10	$ 6.45
		25	$ 5.87
		50	$ 5.28
		100	$ 4.86
		250	$ 4.42

Description

General part information

LT3991 Series

The LT3991 is an adjustable frequency monolithic buck switching regulator that accepts a wide input voltage range up to 55V. 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 0.44Ω 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 LT3991, 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 LT3991 is available in small 10-pin MSOP and 3mm × 3mm DFN packages with exposed pads for low thermal resistance.ApplicationsAutomotive Battery RegulationPower for Portable ProductsIndustrial Supplies

Documents

Technical documentation and resources

Datasheet

R530 Reliability Data

Reliability Data

Technical Data Sheet EN

Datasheet