LT8613 Series

42V, 6A Synchronous Step-Down Regulator with Current Sense and 3μA Quiescent Current

Catalog

42V, 6A Synchronous Step-Down Regulator with Current Sense and 3μA Quiescent Current

Part	Voltage - Input (Max) [Max]	Function	Frequency - Switching [Max]	Frequency - Switching [Min]	Package / Case	Output Type	Supplier Device Package	Operating Temperature [Min]	Operating Temperature [Max]	Output Configuration	Mounting Type	Number of Outputs	Current - Output	Voltage - Output (Min/Fixed) [Min]	Voltage - Input (Min) [Min]	Voltage - Output (Max) [Max]	Topology	Synchronous Rectifier
Analog Devices LT8613IUDE#PBF	42 V	Step-Down	2.2 MHz	200 kHz	28-WFQFN Exposed Pad	Adjustable	28-QFN (3x6)	-40 °C	125 ¯C	Positive or Negative	Surface Mount	1	6 A	0.97 V	3.4 V	41.58 V	Buck
Analog Devices LT8613EUDE	42 V	Step-Down	2.2 MHz	200 kHz	28-WFQFN Exposed Pad	Adjustable	28-QFN (3x6)	-40 °C	125 ¯C	Positive or Negative	Surface Mount	1	6 A	0.97 V	3.4 V	41.58 V	Buck

Catalog

42V, 6A Synchronous Step-Down Regulator with Current Sense and 3μA Quiescent Current

Key Features

• Rail-to-Rail Current Sense Amplifier with Monitor

• Wide Input Voltage Range: 3.4V to 42V

• Ultralow Quiescent Current Burst Mode®Operation:3μA IQRegulating 12VINto 3.3VOUTOutput Ripple < 10mVP-P

• 3μA IQRegulating 12VINto 3.3VOUT

• Output Ripple < 10mVP-P

• High Efficiency Synchronous Operation:95% Efficiency at 3A, 5VOUTfrom 12VIN94% Efficiency at 3A, 3.3VOUTfrom 12VIN

• 95% Efficiency at 3A, 5VOUTfrom 12VIN

• 94% Efficiency at 3A, 3.3VOUTfrom 12VIN

• Fast Minimum Switch-On Time: 40ns

• Low Dropout Under All Conditions: 250mV at 3A

• Allows Use of Small Inductors

• Low EMI

• Adjustable and Synchronizable: 200kHz to 2.2MHz

• Current Mode Operation

• Accurate 1V Enable Pin Threshold

• Internal Compensation

• Output Soft-Start and Tracking

• Small Thermally Enhanced 3mm × 6mm 28-Lead QFN Package

Description

The LT8613 is a compact, high efficiency, high speed synchronous monolithic step-down switching regulator that consumes only 3µA of quiescent current. Top and bottom power switches are included with all necessary circuitry to minimize the need for external components. The built-in current sense amplifier with monitor and control pins allows accurate input or output current regulation and limiting. Low ripple Burst Mode operation enables high efficiency down to very low output currents while keeping the output ripple below 10mVP-P. A SYNC pin allows synchronization to an external clock. Internal compensation with peak current mode topology allows the use of small inductors and results in fast transient response and good loop stability. The EN/UV pin has an accurate 1V threshold and can be used to program VINundervoltage lockout or to shut down the LT8613 reducing the input supply current to 1µA. A capacitor on the TR/SS pin programs the output voltage ramp rate during start-up. The PG flag signals when VOUTis within ±9% of the programmed output voltage as well as fault conditions. The LT8613 is available in a small 28-lead 3mm × 6mm QFN package with exposed pad for low thermal resistance.ApplicationsAutomotive and Industrial SuppliesGeneral Purpose Step-DownCCCV Power Supplies