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1.5MHz, 25V Dual Step-Down DC/DC Converter Delivers 2A per Channel from a TSSOP-20E Package

Dec 11 2006 - MILPITAS, CA
  • Linear Technology announces the LT3510, a dual current mode PWM step-down DC/DC converter with two internal 2.5A power switches packaged in a 20-lead TSSOP-20E package. Each channel is capable of delivering up to 2A of continuous output current at efficiencies up to 88%. Independent input voltage, feedback, soft-start and power good pins for each channel simplify complex power supply tracking and sequencing requirements. The LT3510's wide input range of 3.3V to 25V makes it ideal for regulating power from a wide variety of sources, including 5V and 12V rails, unregulated wall transformers, lead acid batteries and distributed power supplies. The LT3510's switching frequency is user programmable between 250kHz and 1.5MHz, allowing optimization between efficiency and external component size.

    Both of the LT3510's converters are synchronized to either an external clock input or an internal oscillator and maintain a 180 degree phase offset between channels to reduce voltage ripple and input capacitor size. An internal 0.80V reference enables sub 1V output voltages, required to power the latest generation of low voltage DSPs and microcontrollers. Independent, sequential, ratiometric or absolute tracking is easily attained between the outputs. Low drop-out internal switches enable duty cycles to reach 95% while internal cycle-by-cycle current limit provides protection against shorted outputs. The low current (<10µA) shutdown offers extended run-time in battery-powered systems.

    The LT3510EFE is available from stock in a thermally enhanced TSSOP-20 package. There is also an "I" Grade temperature version, the LT3510IFE. Pricing starts at $3.25 and $3.90 each, respectively, for 1,000-piece quantities.

    Summary of Features: LT3510

    • Wide Input Range: 3.3V to 25V
    • Two Switching Regulators with 2A Output Capability
    • Independent Supply to Each Regulator
    • Adjustable/Synchronizable Fixed Frequency Operation from 250kHz to 1.5MHz
    • Antiphase Switching
    • Outputs Can be Paralleled
    • Independent, Sequential, Ratiometric or Absolute Tracking Between Outputs
    • Independent Soft-Start and Power Good Pins
    • Enhanced Short-Circuit Protection
    • Low Dropout: 95% Maximum Duty Cycle
    • Low Shutdown Current: <10µA
    • 20-Lead TSSOP Package with Exposed Leadframe

    25V, 1.5MHz, Dual 2A (IOUT) Step-Down Switching Regulator in TSSOP-20E

    LT3510 PR Image

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