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LTC3701 - 2-Phase, Low Input Voltage, Dual Step-Down DC/DC Controller

The LTC3701 is a 2-phase dual constant frequency current mode step-down DC/DC controller providing excellent load and line regulation. Power loss and noise due to ESR of the input capacitor are minimized by operating the two controller output stages out-of-phase.

The LTC3701 provides a 0.8V ±2% voltage reference and consumes only 460µA of quiescent current. To further maximize the life of a battery source, the external P-channel MOSFET is turned on continuously in dropout (100% duty cycle).

Switching frequency is internally set at 550kHz, allowing the use of small inductors and capacitors. For noise sensitive applications, the LTC3701 can be externally synchronized using its phase-locked loop. The frequency can also be externally set from 300kHz to 750kHz by applying a voltage to the PLLLPF pin. Burst Mode operation is inhibited during synchronization or when the EXTCLK/MODE pin is pulled low to reduce noise and RF interference.

The LTC3701 contains independent internal soft-start circuitry for each controller. Other features include a power good output voltage monitor and output overvoltage and short-circuit protection.

The LTC3701 is available in a small footprint 16-lead narrow SSOP package.

Features Out-of-Phase Controllers Reduce Required Input Capacitance True PLL for Frequency Locking or Frequency Adjustment Operating Frequency Range: 300kHz to 750kHz Wide VIN Range: 2.5V to 10V Constant Frequency Current Mode Architecture Low Dropout: 100% Duty Cycle Power Good Output Voltage Monitor Internal Soft-Start Circuitry Selectable Burst Mode®/Pulse Skipping Operation at Light Loads Output Overvoltage Protection Low Quiescent Current: 460µA 0.8V ±2% Voltage Reference Small 16-Lead Narrow SSOP Package Typical Application

Applications One or Two Lithium-Ion Powered Applications Notebook and Handheld Computers Personal Digital Assistants Portable Instruments Distributed DC Power Systems Packaging

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