LT3970 Series Series

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

Catalog

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

Part	Function	Package / Case	Package / Case [x]	Package / Case [x]	Output Type	Topology	Supplier Device Package	Voltage - Input (Min) [Min]	Voltage - Output (Min/Fixed)	Number of Outputs	Voltage - Output (Max) [Max]	Mounting Type	Current - Output	Operating Temperature [Min]	Operating Temperature [Max]	Output Configuration	Output Type
Analog Devices LT3970EMS#PBF	Step-Down	10-MSOP 10-TFSOP	3 mm	0.118 in	Adjustable	Buck	10-MSOP	4.2 V	1.21 V	1	25 V	Surface Mount	350 mA	-40 °C	125 ¯C	Positive
Analog Devices LT3970HMS#PBF	Step-Down	10-MSOP 10-TFSOP	3 mm	0.118 in	Adjustable	Buck	10-MSOP	4.2 V	1.21 V	1	25 V	Surface Mount	350 mA	-40 °C	150 °C	Positive
Analog Devices LT3970IMS-5#PBF	Step-Down	10-MSOP 10-TFSOP	3 mm	0.118 in		Buck	10-MSOP	4.2 V	5 V	1		Surface Mount	350 mA	-40 °C	125 ¯C	Positive	1.81 mOhm
Analog Devices LT3970IDDB-3.3#TRMPBF	Step-Down	10-WFDFN Exposed Pad				Buck	10-DFN (3x2)	4.2 V	3.3 V	1		Surface Mount	350 mA	-40 °C	125 ¯C	Positive	1.81 mOhm
Analog Devices LT3970EDDB#TRMPBF	Step-Down	10-WFDFN Exposed Pad			Adjustable	Buck	10-DFN (3x2)	4.2 V	1.21 V	1	25 V	Surface Mount	350 mA	-40 °C	125 ¯C	Positive
Analog Devices LT3970IMS-5#TRPBF	Step-Down	10-MSOP 10-TFSOP	3 mm	0.118 in		Buck	10-MSOP	4.2 V	5 V	1		Surface Mount	350 mA	-40 °C	125 ¯C	Positive	1.81 mOhm
Analog Devices LT3970HMS#TRPBF	Step-Down	10-MSOP 10-TFSOP	3 mm	0.118 in	Adjustable	Buck	10-MSOP	4.2 V	1.21 V	1	25 V	Surface Mount	350 mA	-40 °C	150 °C	Positive
Analog Devices LT3970EDDB-3.42#TRPBF	Step-Down	10-WFDFN Exposed Pad				Buck	10-DFN (3x2)	4.2 V	3.42 V	1		Surface Mount	350 mA	-40 °C	125 ¯C	Positive	1.81 mOhm
Analog Devices LT3970EMS-5#TRPBF	Step-Down	10-MSOP 10-TFSOP	3 mm	0.118 in		Buck	10-MSOP	4.2 V	5 V	1		Surface Mount	350 mA	-40 °C	125 ¯C	Positive	1.81 mOhm

Catalog

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

Key Features

• Low Ripple Burst Mode®Operation2.5µA IQat 12VINto 3.3VOUTOutput Ripple < 5mVP-P

• 2.5µA IQat 12VINto 3.3VOUT

• Output Ripple < 5mVP-P

• Wide Input Voltage Range: 4.2V to 40V Operating

• Adjustable Switching Frequency: 200kHz to 2.2MHz

• Integrated Boost and Catch Diodes

• 350mA Output Current

• Fixed Output Voltages:3.3V, 3.42V, 5V1.8μA IQat 12VIN

• 3.3V, 3.42V, 5V

• 1.8μA IQat 12VIN

• Accurate 1V Enable Pin Threshold

• Low Shutdown Current: IQ= 0.7μA

• Internal Sense Limits Catch Diode Current

• Power Good Flag

• Output Voltage: 1.21V to 25V

• Internal Compensation

• Small 10-Pin MSOP and (3mm × 2mm) DFN Packages

• AEC-Q100 Qualified for Automotive Applications

Description

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