40V, 500mA(IOUT), 2.2MHz Step-Down DC/DC Converter in a Tiny 2mm × 2mm DFN

May 22 2007 -MILPITAS, CA
  • Linear Technology Corporation announces the LT3502/A, a 500mA (IOUT), 40V step-down switching regulator packaged in a 2mm × 2mm DFN. The LT3502/A's 3.4V to 40V input voltage range makes it ideal for harsh environment & automotive load dump and cold-crank conditions. The device can deliver up to 500mA of continuous output current to voltages as low as 0.8V. Switching frequency is either 1.1MHz (standard version) or 2.2MHz ("A" version), enabling the user to optimize efficiency while avoiding critical noise-sensitive frequency bands. The combination of its 2mm × 2mm DFN-8 package and high switching frequency keeps the external capacitors and inductor small, providing a very compact, thermally efficient footprint.

    The LT3502/A utilizes a high efficiency 900mA, 300mVCESAT switch, with the necessary boost diode, oscillator, control and logic circuitry integrated on-chip. Special design techniques enable high efficiency over a wide input voltage range & the LT3502/A's current mode topology enables fast transient response and excellent loop stability. Other features include internal compensation, soft-start and short circuit protection.

    The LT3502EDC and LT3502AEDC are both available in a 2mm × 2mm DFN 8 package from stock. They are both priced starting at $1.95 each for 1,000-piece quantities. The LT3502IDC and LT3502AIDC are tested and guaranteed to operate from a –40°C to 125°C operating junction temperature. Both devices are priced at $2.34 in 1,000-piece quantities and are available from stock.


    Summary of Features: LT3502/A

    • 3.4V to 40V Input
    • 500mA Output Current
    • Switching Frequency: 2.2MHz (LT3502A), 1.1MHz (LT3502)
    • 800mV Feedback Voltage
    • Short-Circuit Robust
    • Soft-Start
    • Low Shutdown Current: <1UA 
    • Internally Compensated
    • Internal Boost Diode
    • Thermally Enhanced 2mm × 2mm 8-Lead DFN

    40V, 500mA(IOUT), 2.2MHz Step-Down DC/DC Converter in 2mm × 2mm DFN

     

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