LT3972 Series

33V, 3.5A, 2.4MHz Step-Down Switching Regulator with 75μA Quiescent Current

Catalog

33V, 3.5A, 2.4MHz Step-Down Switching Regulator with 75μA Quiescent Current

Part	Supplier Device Package	Voltage - Input (Max) [Max]	Function	Output Type	Package / Case	Mounting Type	Voltage - Output (Max) [Max]	Current - Output	Voltage - Input (Min) [Min]	Voltage - Output (Min/Fixed) [Min]	Topology	Frequency - Switching [Min]	Frequency - Switching [Max]	Output Configuration	Number of Outputs	Operating Temperature [Min]	Operating Temperature [Max]	Package / Case
Analog Devices LT3972EDD#TRPBF	10-DFN (3x3)	33 V	Step-Down	Adjustable	10-WFDFN Exposed Pad	Surface Mount	30 V	3.5 A	3.6 V	0.79 V	Buck	230 kHz	2.45 MHz	Positive	1	-40 °C	125 ¯C
Analog Devices LT3972IMSE#PBF	10-MSOP-EP	33 V	Step-Down	Adjustable	10-MSOP 10-TFSOP Exposed Pad	Surface Mount	30 V	3.5 A	3.6 V	0.79 V	Buck	230 kHz	2.45 MHz	Positive	1	-40 °C	125 ¯C	0.118 in 3 Lead
Analog Devices LT3972EMSE#TRPBF	10-MSOP-EP	33 V	Step-Down	Adjustable	10-MSOP 10-TFSOP Exposed Pad	Surface Mount	30 V	3.5 A	3.6 V	0.79 V	Buck	230 kHz	2.45 MHz	Positive	1	-40 °C	125 ¯C	0.118 in 3 Lead
Analog Devices LT3972EMSE#PBF	10-MSOP-EP	33 V	Step-Down	Adjustable	10-MSOP 10-TFSOP Exposed Pad	Surface Mount	30 V	3.5 A	3.6 V	0.79 V	Buck	230 kHz	2.45 MHz	Positive	1	-40 °C	125 ¯C	0.118 in 3 Lead

Catalog

33V, 3.5A, 2.4MHz Step-Down Switching Regulator with 75μA Quiescent Current

Key Features

• Wide Input Range:Operation from 3.6V to 33VOver-Voltage Lockout Protects Circuits Through 62V Transients

• Operation from 3.6V to 33V

• Over-Voltage Lockout Protects Circuits Through 62V Transients

• 3.5A Maximum Output Current

• Low Ripple (<15mVP-P) Burst Mode®Operation: IQ= 75μA at 12VINto 3.3VOUT

• Adjustable Switching Frequency: 200kHz to 2.4MHz

• Low Shutdown Current: IQ< 1μA

• Integrated Boost Diode

• Synchronizable Between 250kHz to 2MHz

• Power Good Flag

• Saturating Switch Design: 95mΩ On-Resistance

• Output Voltage: 0.79V to 30V

• Thermal Protection

• Soft-Start Capability

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

Description

The LT3972 is an adjustable frequency (200kHz to 2.4MHz) monolithic buck switching regulator that accepts input voltages up to 33V (62V Maximum). A high efficiency 95mΩ switch is included on the die along with a boost Schottky diode and the necessary oscillator, control, and logic circuitry. Current mode topology is used for fast transient response and good loop stability. Low ripple Burst Mode operation maintains high efficiency at low output currents while keeping output ripple below 15mV in a typical application. In addition, the LT3972 can further enhance low output current efficiency by drawing bias current from the output when VOUTis above 3V Shutdown reduces input supply current to less than 1μA while a resistor and capacitor on the RUN/SS pin provide a controlled output voltage ramp (soft-start). A power good flag signals when VOUTreaches 91% of the programmed output voltage. The LT3972 is available in 10-Pin MSOP and 3mm × 3mm DFN packages with exposed pads for low thermal resistance.ApplicationsAutomotive Battery RegulationDistributed Supply RegulationIndustrial SuppliesWall Transformer Regulation