LT3970HMS#PBF

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Analog Devices Inc./Maxim Integrated

40V, 350MA STEP-DOWN REGULATOR WITH 2.5ΜA QUIESCENT CURRENT AND INTEGRATED DIODES

LT3970HMS#PBF

Active

Analog Devices Inc./Maxim Integrated

40V, 350MA STEP-DOWN REGULATOR WITH 2.5ΜA QUIESCENT CURRENT AND INTEGRATED DIODES

Description Specifications Series Pricing CAD Documents

Description

General part information

LT3970 Series Series

The LT3970 is an adjustable frequency monolithic buck switching regulator that accepts a wide input voltage range up to 40V, and consumes only 2.5μA of quiescent current. A high efficiency switch is included on the die along with the catch diode, boost diode, and the necessary oscillator, control and logic circuitry. Low ripple Burst Mode operation maintains high efficiency at low output currents while keeping the output ripple below 5mV in a typical application. Current mode topology is used for fast transient response and good loop stability. A catch diode current limit provides protection against shorted outputs and overvoltage conditions. An enable pin with accurate threshold is available, producing a low shutdown current of 0.7μA. A power good flag signals when VOUTreaches 90% of the programmed output voltage. The LT3970 is available in small 10-pin MSOP and 3mm × 2mm DFN packages.ApplicationsAutomotive Battery RegulationPower for Portable ProductsIndustrial Supplies

Technical Specifications

Parameters and characteristics for this part

Specification	LT3970HMS#PBF

Current - Output	350 mA
Frequency - Switching (Max)	2.25 MHz
Frequency - Switching (Min)	200 kHz
Function	Step-Down
Mounting Type	Surface Mount
Number of Outputs	1
Operating Temperature (Max)	150 °C
Operating Temperature (Min)	-40 °C
Output Configuration	Positive
Output Type	Adjustable
Package Length	0.118 in
Package Name	10-MSOP, 10-TFSOP
Package Width	3 mm
Synchronous Rectifier	No
Topology	Buck
Voltage - Input (Max)	40 V
Voltage - Input (Min)	4.2 V
Voltage - Output (Max)	25 V
Voltage - Output (Min/Fixed)	1.21 V

LT3970 Series Series

40V, 350mA Step-Down Regulator with 2.5μA Quiescent Current and Integrated Diodes

Part	Function	Output Type	Output Configuration	Frequency - Switching (Min)	Frequency - Switching (Max)	Package / Case	Topology	Voltage - Input (Max)	Voltage - Input (Min)	Current - Output	Mounting Type	Package Length	Package Name	Package Width	Operating Temperature (Max)	Operating Temperature (Min)	Synchronous Rectifier	Number of Outputs	Voltage - Output (Min/Fixed)	Voltage - Output (Max)
Analog Devices Inc./Maxim Integrated LT3970IDDB-5#TRMPBF	Step-Down	Fixed	Positive	200 kHz	2.25 MHz	10-WFDFN Exposed Pad	Buck	40 V	4.2 V	350 mA	Surface Mount	3 mm	10-DFN	2 mm	125 °C	-40 °C	No	1	5 V
Analog Devices Inc./Maxim Integrated LT3970EMS#PBF	Step-Down	Adjustable	Positive	200 kHz	2.25 MHz		Buck	40 V	4.2 V	350 mA	Surface Mount	0.118 in	10-MSOP 10-TFSOP	3 mm	125 °C	-40 °C	No	1	1.21 V	25 V
Analog Devices Inc./Maxim Integrated LT3970EDDB-3.3#TRMPBF	Step-Down	Fixed	Positive	200 kHz	2.25 MHz	10-WFDFN Exposed Pad	Buck	40 V	4.2 V	350 mA	Surface Mount	3 mm	10-DFN	2 mm	125 °C	-40 °C	No	1	3.3 V
Analog Devices Inc./Maxim Integrated LT3970HMS#PBF	Step-Down	Adjustable	Positive	200 kHz	2.25 MHz		Buck	40 V	4.2 V	350 mA	Surface Mount	0.118 in	10-MSOP 10-TFSOP	3 mm	150 °C	-40 °C	No	1	1.21 V	25 V
Analog Devices Inc./Maxim Integrated LT3970HMS-3.3#PBF	Step-Down	Fixed	Positive	200 kHz	2.25 MHz		Buck	40 V	4.2 V	350 mA	Surface Mount	0.118 in	10-MSOP 10-TFSOP	3 mm	150 °C	-40 °C	No	1	3.3 V
Analog Devices Inc./Maxim Integrated LT3970IMS-3.3#PBF	Step-Down	Fixed	Positive	200 kHz	2.25 MHz		Buck	40 V	4.2 V	350 mA	Surface Mount	0.118 in	10-MSOP 10-TFSOP	3 mm	125 °C	-40 °C	No	1	3.3 V
Analog Devices Inc./Maxim Integrated LT3970IMS-5#PBF	Step-Down	Fixed	Positive	200 kHz	2.25 MHz		Buck	40 V	4.2 V	350 mA	Surface Mount	0.118 in	10-MSOP 10-TFSOP	3 mm	125 °C	-40 °C	No	1	5 V
Analog Devices Inc./Maxim Integrated LT3970IMS-3.3#TRPBF	Step-Down	Fixed	Positive	200 kHz	2.25 MHz		Buck	40 V	4.2 V	350 mA	Surface Mount	0.118 in	10-MSOP 10-TFSOP	3 mm	125 °C	-40 °C	No	1	3.3 V
Analog Devices Inc./Maxim Integrated LT3970EDDB-3.3#TRPBF	Step-Down	Fixed	Positive	200 kHz	2.25 MHz	10-WFDFN Exposed Pad	Buck	40 V	4.2 V	350 mA	Surface Mount	3 mm	10-DFN	2 mm	125 °C	-40 °C	No	1	3.3 V
Analog Devices Inc./Maxim Integrated LT3970EMS-3.3#TRPBF	Step-Down	Fixed	Positive	200 kHz	2.25 MHz		Buck	40 V	4.2 V	350 mA	Surface Mount	0.118 in	10-MSOP 10-TFSOP	3 mm	125 °C	-40 °C	No	1	3.3 V

Pricing

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CAD

3D models and CAD resources for this part

Documents

Technical documentation and resources

LT3970: 40V, 350mA Step-Down Regulator with 2.5μA Quiescent Current and Integrated Diodes Data Sheet (Rev.D)

R530 Reliability Data