LT3980 Series

58V, 2A, 2.4MHz Step-Down Switching Regulator with 85μA Quiescent Current

Catalog

58V, 2A, 2.4MHz Step-Down Switching Regulator with 85μA Quiescent Current

Part	Number of Outputs	Voltage - Input (Min) [Min]	Output Configuration	Supplier Device Package	Mounting Type	Current - Output	Frequency - Switching [Min]	Frequency - Switching [Max]	Topology	Output Type	Voltage - Output (Min/Fixed) [Min]	Package / Case	Package / Case	Operating Temperature [Max]	Operating Temperature [Min]	Voltage - Output (Max) [Max]	Function
Analog Devices LT3980HMSE#TRPBF	1	3.6 V	Positive	16-MSOP-EP	Surface Mount	2 A	225 kHz	2.25 MHz	Buck	Adjustable	0.79 V	16-TFSOP Exposed Pad	0.118 in 3 mm	150 °C	-40 °C	57.42 V	Step-Down
Analog Devices LT3980HMSE#TR	1	3.6 V	Positive	16-MSOP-EP	Surface Mount	2 A	225 kHz	2.25 MHz	Buck	Adjustable	0.79 V	16-TFSOP Exposed Pad	0.118 in 3 mm	150 °C	-40 °C	58 V	Step-Down
Analog Devices LT3980IMSE#TRPBF	1	3.6 V	Positive	16-MSOP-EP	Surface Mount	2 A	225 kHz	2.25 MHz	Buck	Adjustable	0.79 V	16-TFSOP Exposed Pad	0.118 in 3 mm	125 ¯C	-40 °C	57.42 V	Step-Down
Analog Devices LT3980EMSE#PBF	1	3.6 V	Positive	16-MSOP-EP	Surface Mount	2 A	225 kHz	2.25 MHz	Buck	Adjustable	0.79 V	16-TFSOP Exposed Pad	0.118 in 3 mm	125 ¯C	-40 °C	57.42 V	Step-Down

Catalog

58V, 2A, 2.4MHz Step-Down Switching Regulator with 85μA Quiescent Current

Key Features

• Wide Input Range: Operation from 3.6V to 58V

• Overvoltage Lockout Protects Circuits Through 80V Transients

• 2A Maximum Output Current

• Low Ripple (<15mVP-P) Burst Mode®Operation: IQ= 85μA at 12VINto 3.3VOUT

• Adjustable Switching Frequency: 100kHz to 2.4MHz

• Low Shutdown Current: IQ< 1μA

• Catch Diode Current Sense Protects Circuit Through Short-Circuit and Input Overvoltage

• Synchronizable Between 250kHz to 2MHz

• Power Good Flag

• Saturating Switch Design: 200mΩ On-Resistance

• Thermal Protection

• Soft-Start Capability

• Small 16-Pin Thermally Enhanced MSOP and 3mm × 4mm DFN Packages

Description

The LT3980 is an adjustable frequency (100kHz to 2.4MHz) monolithic buck switching regulator that accepts input voltages up to 58V (80V transient). A high efficiency 200mΩ 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. Catch diode current sense (DA pin) protects the circuit during input voltage transients even when a high switching frequency is used. 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 LT3980 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 LT3980 is available in 16-pin MSOP and 3mm × 4mm DFN packages with exposed pads for low thermal resistance.ApplicationsAutomotive Battery RegulationDistributed Supply RegulationIndustrial SuppliesWall Transformer Regulation