LTC3701EGN#PBF

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. 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. It contains independent internal soft-start circuitry for each controller. It is used in application such as one or two lithium-ion powered applications, notebook and handheld computers, personal digital assistants, portable instruments, distributed DC power systems etc.

• Out-of-phase controllers reduce required input capacitance
• True PLL for frequency locking or frequency adjustment
• Wide VIN range is 2.5V to 10V
• Constant frequency current mode architecture
• Power good output voltage monitor, internal soft-start circuitry
• Selectable Burst Mode®/pulse skipping operation at light loads
• Output overvoltage protection, ±2% voltage reference
• Low quiescent current is 460µA typ at (2.5V <lt/> VIN <lt/> 9.8V, TA = 25°C. VIN = 4.2V)
• Regulated feedback voltage is 0.8V typical at (TA = 25°C. VIN = 4.2V)
• Operating ambient temperature is -40°C to 85°C, package style is 16-lead plastic SSOP

附註

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