LTC3407AIDD#PBF

LTC3407AIDD#PBF is a dual, constant frequency, synchronous step-down DC/DC converter. Intended for low-power applications, it operates from a 2.5V to 5.5V input voltage range and has a constant 1.5MHz switching frequency, enabling the use of tiny, low-cost capacitors and inductors 1mm or less in height. Each output voltage is adjustable from 0.6V to 5V. Internal synchronous 0.35 ohm, 1A power switches provide high efficiency without the need for external Schottky diodes. A user-selectable mode input is provided to allow the user to trade-off ripple noise for low power efficiency. Burst Mode® operation provides the highest efficiency at light loads, while pulse skip mode provides the lowest ripple noise at light loads. Applications include PDAs/palmtop PCs, digital cameras, cellular phones, wireless and DSL modems.

• Current mode operation for excellent line and load transient response
• Short-circuit protected, low dropout operation: 100% duty cycle
• Power-on reset output, externally synchronizable oscillator, optional external soft-start
• No Schottky diodes required, high efficiency up to 96%
• Feedback pin input current is 30nA maximum
• Active mode input DC supply current is 600μA typical at (VFB1 = VFB2 = 0.5V, TA = 25°C)
• Shutdown input DC supply current is 0.1μA typical at (RUN = 0V, VIN = 5.5V, MODE/SYNC = 0V)
• Oscillator frequency is 1.5MHz typical at (VFBX = 0.6V)
• Peak switch current limit is 1A typical at (VIN = 3V, VFBX = 0.5V, duty cycle <35%, TA = 25°C)
• Operating temperature range from -40°C to 125°C, 10-lead plastic DFN package

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