LT8495 Series

SEPIC/Boost Converter with 2A, 70V Switch, 9μA Quiescent Current, POR and Watchdog Timer

Catalog

SEPIC/Boost Converter with 2A, 70V Switch, 9μA Quiescent Current, POR and Watchdog Timer

Part	Output Type	Topology	Voltage - Input (Min) [Min]	Package / Case [custom]	Package / Case [custom]	Package / Case [custom]	Frequency - Switching [Max]	Frequency - Switching [Min]	Current - Output	Output Configuration	Supplier Device Package	Voltage - Output (Max) [Max]	Voltage - Output (Min/Fixed)	Mounting Type	Function	Operating Temperature [Min]	Operating Temperature [Max]	Number of Outputs	Voltage - Input (Max) [Max]	Package / Case
Analog Devices LT8495EFE#PBF	Adjustable	Boost Flyback SEPIC	1 V	0.173 in 4.4 mm	Exposed Pad	20-TSSOP	1 MHz	250 kHz	2.1 A	Positive	20-TSSOP-EP	70 V	1.202 V	Surface Mount	Step-Up Step-Up/Step-Down	-40 °C	125 ¯C	1	60 V
Analog Devices LT8495EUF#TRPBF	Adjustable	Boost Charge Pump Flyback SEPIC	1 V				1 MHz	250 kHz	2.1 A	Positive	20-QFN (4x4)	70 V	1.202 V	Surface Mount	Step-Up Step-Up/Step-Down	-40 °C	125 ¯C	1	60 V	20-WFQFN Exposed Pad
Analog Devices LT8495IUF#PBF	Adjustable	Boost Charge Pump Flyback SEPIC	1 V				1 MHz	250 kHz	2.1 A	Positive	20-QFN (4x4)	70 V	1.202 V	Surface Mount	Step-Up Step-Up/Step-Down	-40 °C	125 ¯C	1	60 V	20-WFQFN Exposed Pad
Analog Devices LT8495EFE#TRPBF	Adjustable	Boost Flyback SEPIC	1 V	0.173 in 4.4 mm	Exposed Pad	20-TSSOP	1 MHz	250 kHz	2.1 A	Positive	20-TSSOP-EP	70 V	1.202 V	Surface Mount	Step-Up Step-Up/Step-Down	-40 °C	125 ¯C	1	60 V

Catalog

SEPIC/Boost Converter with 2A, 70V Switch, 9μA Quiescent Current, POR and Watchdog Timer

Key Features

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

• Low Ripple Burst Mode®Operation9μA IQat 12VINto 5.0VOUTOutput Ripple (<10mV Typ.)

• 9μA IQat 12VINto 5.0VOUT

• Output Ripple (<10mV Typ.)

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

• Improves Efficiency

• Reduces Minimum Supply Voltage to ~1V after Start-Up to Extend Battery Life

• Integrated 2A/70V Power Switch

• Programmable Watchdog Timer Can Operate When VINSupply Is Removed

• Programmable Power-On Reset Timer (POR) withRSTFunctional for Input Supply Down to 1.3V

• FMEA Fault Tolerant in TSSOP Package

• Fixed Frequency PWM, SEPIC/BOOST/FLYBACK Topologies

• Programmable Switching Frequency: 250kHz to 1.5MHz

• UVLO Programmable on SWEN andRSTINPins

• Soft-Start Programmable with One Capacitor

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

Description

The LT8495 is an adjustable frequency (250kHz to 1.5MHz) monolithic switching regulator with a power-on reset and watchdog timer. Quiescent current can be less than 9μA when operating and is ~0.3μA when SWEN, WDE andRSTINare low. Configurable as 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.The reset and watchdog timeout periods are independently adjustable using external capacitors. Using a resistor divider on the SWEN pin provides a programmable undervoltage lockout (UVLO) for the converter. A resistor divider connected toRSTINprovides UVLO control that asserts theRSTpin.Additional features such as frequency foldback and soft-start are integrated. Fault tolerance in the TSSOP allows for adjacent pin shorts or an open without raising the output voltage above its programmed value. The LT8495 is available in 20-lead QFN and 20-lead TSSOP packages with exposed pads for low thermal resistance.ApplicationsAutomotive ECU PowerPower for Portable ProductsIndustrial Supplies