LTC3407EMSE-4#PBF

LTC3407EMSE-4#PBF is a dual, constant frequency, synchronous step down DC/DC converter. Intended for low power applications, it operates from 2.5V to 5.5V input voltage range and has a constant 2.25MHz switching frequency, allowing the use of tiny, low cost capacitors and inductors with a profile ≤1mm. Each output voltage is adjustable from 0.6V to 5V. Internal synchronous 0.35 ohm, 1.2A 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 noise ripple for low power efficiency. Burst Mode® operation provides high efficiency at light loads, while pulse-skipping mode provides low noise ripple at light loads. Applications include PDAs/palmtop PCs, digital cameras, cellular phones, portable media players, PC cards, 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
• High efficiency up to 95%, no Schottky diodes required
• Shutdown input DC supply current is 0.1μA typical at (RUN = 0V, VIN = 5.5V, MODE/SYNC = 0V)
• Oscillator frequency is 2.25MHz typical at (VFBX = 0.6V, TA = 25°C)
• Peak switch current Limit is 1.2A typical at (VIN = 3V, VFBX = 0.5V, duty cycle <35%)
• Switch leakage current is 1μA maximum at (VIN = 5V, VRUN = 0V, VFBX = 0V)
• Top switch on-resistance is 0.35 ohm typical at (TA = 25°C)
• Ambient temperature range from -40°C to 85°C, 10-lead plastic MSOP package

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