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

Linear Technology LT8494

Linear Technology Corporation announces the LT8494, a current mode, fixed frequency SEPIC/boost DC/DC converter with an internal 2 A, 70 V switch. Ultralow quiescent current of only 7 μA makes the device ideal for always-on automotive or other industrial battery powered systems. The LT8494 starts up from an input voltage range of 2.5 V to 32 V and once running it operates from inputs from 1 V to 60 V, making it suitable for applications with input sources ranging from a single-cell Li-Ion to automotive inputs. The LT8494 can be configured as a boost, SEPIC or flyback converter. Its switching frequency can be programmed via a single resistor between 250 kHz and 1.5 MHz, enabling designers to minimize external component sizes. The combination of a thermally enhanced TSSOP-20E or 4 mm × 4 mm QFN package and tiny externals ensures a very compact footprint while minimizing solution cost.

Linear Technology - LT8494

The LT8494’s internal, high efficiency 2 A/70 V switch delivers efficiencies of up to 83% while operating in a SEPIC configuration. A unique design using dual supply pins (VIN and BIAS) enables the device to operate from the most efficient supply, optimizing efficiency over a wide range of conditions. The LT8494 can operate with input supply voltages up to 60 V for SEPIC topology and up to 32 V, with ride through protection in boost and flyback topologies. Other features include a FMEA tolerant package (TSSOP-20E), power good indicator, programmable softstart and thermal shutdown protection.

LT8494 - Efficiency vs. Load Current
Efficiency vs. Load Current.

The LT8494 is available in a thermally enhanced TSSOP-20 package. Pricing starts at $2.85 each for 1,000 piece quantities. Industrial temperature (–40 °C to 125 °C) and high temperature (–40 °C to 150 °C) grades are also available. All versions are available from stock.

Summary of Features: LT8494

  • Wide Input Voltage Range of ~1 V to 60 V (2.5 V to 32 V for Start-Up)
  • Low Ripple Burst Mode Operation:
    • 7 μA IQ at 12VIN to 5.0VOUT
    • Output Ripple (<10 mV Typ.)
  • Dual Supply Pins:
    • Improves Efficiency
    • Reduces Minimum Supply Voltage to ~1 V after Start-Up to Extend Battery Life
  • Integrated 2 A/70 V Power Switch
  • Power Good Functional for Input Supply Down to 1.3 V
  • FMEA Fault Tolerant in TSSOP Package
  • Fixed Frequency PWM, SEPIC/Boost/Flyback Topologies
  • Programmable Switching Frequency: 250 kHz to 1.5 MHz
  • UVLO Programmable on SWEN Pin
  • Soft-Start Programmable with One Capacitor
  • 20-Lead TSSOP and 4 mm × 4 mm QFN Packages

$2 Start Your PCB and SMT. Get coupon code: JLCNY

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