60V, 200kHz, 500mA (ISW) Step-Down DC/DC Converter Consumes Only 100uA Quiescent Current

Jul 28 2005 - MILPITAS, CA
  • Linear Technology Corporation announces the LT3437, a 60V (with transients up to 80V) 200kHz step-down switching regulator with quiescent current under 100uA. The LT3437 operates within a VIN range of 3.3V to 60V, making it ideal for load dump or cold-crank conditions commonly found in automotive applications. Its 500mA internal switch can deliver up to 400mA of continuous output current at voltages as low as 1.25V. The LT3437's Burst Mode® operation offers ultra-low quiescent current, well suited for applications such as automotive or telecom systems, which demand always-on operation and optimum battery life. The combination of its 3mm × 3mm DFN package (or thermally enhanced TSSOP-16E) and 200kHz switching frequency, which keeps external inductors and capacitors small, provides a very compact, thermally efficient footprint.

    The LT3437 utilizes a high efficiency 500mA, 0.8 Ω switch with the necessary oscillator, control and logic circuitry integrated into a single die. Special design techniques and a high voltage process enable high efficiency over a wide input voltage range while its current mode topology enables fast transient response and excellent loop stability. Other features include external synchronization (from 240kHz to 700kHz), soft-start capability and Burst Mode defeat for low noise applications.

    Pricing for the LT3437EDD DFN version starts at $2.25. The LT3437IDD, which is tested and guaranteed to operate from a –40°C to 125°C operating junction temperature, is priced at $2.70 each. The LT3437EFE TSSOP-16E version pricing starts at $2.30 each. All prices are for 1,000-piece quantities and all versions are available from stock.

    Summary of Features: LT3437

    • Wide Input Range: 3.3V to 60V
    • Load Dump (Input Transient) Protection to 80V
    • 500mA Peak Switch Current
    • Burst Mode Operation: 100uA Quiescent Current
    • Burst Mode Operation Defeat
    • 200kHz Switching Frequency
    • Saturating Switch Design: 0.8Ω On-Resistance
    • 1.25V Feedback Reference Voltage
    • Easily Synchronizable
    • Soft-Start Capability
    • Small 3mm × 3mm DFN-10 or Thermally Enhance TSSOP-16E Package


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