LT8494 Datasheet | Linear Technology

LT8494 SEPIC/Boost DC/DC Converter with 2A, 70V Switch, and 7µA Quiescent Current Features nn Low Ripple Burst Mode® Operation: 7µA IQ at 12VIN to 5VOUT Output Ripple (<10m V Typ.) nn Dual Supply Pins: Improves Efficiency Reduces Minimum Supply Voltage to ~1V after Start-Up to Extend Battery Life nn Wide Input Voltage Range of ~1V to 60V (2.5V to 32V for Start-Up) nn PG Functional for Input Supply Down to 1.3V nn FMEA Fault Tolerant in TSSOP Package nn Fixed Frequency PWM, SEPIC/BOOST/FLYBACK Topologies nn NPN Power Switch: 2A/70V nn Programmable Switching Frequency: 250k Hz to 1.5MHz nn UVLO Programmable on SWEN Pin nn Soft-Start Programmable with One Capacitor nn Small 20-Lead QFN or 20-Lead TSSOP Packages APPLICATIONS nn Automotive ECU Power nn Power for Portable Products nn Industrial Supplies L, LT, LTC, LTM, Linear Technology, Burst Mode and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. DESCRIPTION The LT®8494isanadjustablefrequency (250k Hzto 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 10m V. Dual supply pins (VIN and 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 VIN voltage 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 VOUT reaches 92% of the programmed output voltage. Additional Features such as...