LT8494 Series

SEPIC/Boost DC/DC Converter with 2A, 70V Switch, and 7μA Quiescent Current

Catalog

SEPIC/Boost DC/DC Converter with 2A, 70V Switch, and 7μA Quiescent Current

Part	Supplier Device Package	Current - Output	Voltage - Input (Max) [Max]	Voltage - Output (Max) [Max]	Voltage - Output (Min/Fixed)	Package / Case	Output Configuration	Operating Temperature [Min]	Operating Temperature [Max]	Frequency - Switching [Min]	Frequency - Switching [Max]	Topology	Synchronous Rectifier	Output Type	Number of Outputs	Mounting Type	Voltage - Input (Min) [Min]	Function
Analog Devices LT8494EUF#PBF	20-QFN (4x4)	2 A	60 V	70 V	1.202 V	20-WFQFN Exposed Pad	Positive	-40 °C	125 ¯C	250 kHz	1.5 MHz	Boost Charge Pump Flyback SEPIC		Adjustable	1	Surface Mount	1 V	Step-Up Step-Up/Step-Down

Catalog

SEPIC/Boost DC/DC Converter with 2A, 70V Switch, and 7μA Quiescent Current

Key Features

• Low Ripple Burst Mode®Operation:7μA IQat 12VINto 5VOUTOutput Ripple (<10mV Typ.)

• 7μA IQat 12VINto 5VOUT

• Output Ripple (<10mV Typ.)

• Dual Supply Pins:Improves EfficiencyReduces Minimum Supply Voltage to ~1V afterStart-Up to Extend Battery Life

• Improves Efficiency

• Reduces Minimum Supply Voltage to ~1V after

• Start-Up to Extend Battery Life

• Wide Input Voltage Range of ~1V to 60V (2.5V to 32V for Start-Up)

• PG Functional for Input Supply Down to 1.3V

• FMEA Fault Tolerant in TSSOP Package

• Fixed Frequency PWM, SEPIC/BOOST/FLYBACK Topologies

• NPN Power Switch: 2A/70V

• Programmable Switching Frequency: 250kHz to 1.5MHz

• UVLO Programmable on SWEN Pin

• Soft-Start Programmable with One Capacitor

• Small 20-Lead QFN or 20-Lead TSSOP Packages

Description

The LT8494 is an adjustable frequency (250kHz to 1.5MHz) monolithic switching regulator. Quiescent current can be less than 7μA when operating and is ~0.3μA when SWEN is low. The LT8494 can be configured as either a SEPIC, boost or flyback converter.The low ripple Burst Mode operation maintains high efficiency at low output current while keeping output ripple below 10mV. Dual supply pins (VINand BIAS) allow the part to automatically operate from the most efficient supply. Input supply voltage can be up to 60V for SEPIC topologies and up to 32V (with ride-through up to 60V) for boost and flyback topologies. After start-up, battery life is extended since the part can draw current from its output (BIAS) even when VINvoltage drops below 2.5V.Using a resistor divider on the SWEN pin provides a programmable undervoltage lockout (UVLO) for the converter. A power good flag signals when VOUTreaches 92% of the programmed output voltage.Additional features such as frequency foldback and soft-start are integrated. The LT8494 is available in 20-lead QFN and 20-lead TSSOP packages with exposed pads for low thermal resistance. Fault tolerance in the TSSOP allows for adjacent pin shorts or an open without raising the output voltage above its programmed value.ApplicationsAutomotive ECU PowerPower for Portable ProductsIndustrial Supplies