LTC3626 Datasheet | Linear Technology

20V, 2.5A Synchronous Monolithic Step-Down Regulator with Current and Temperature Monitoring Features nn 3.6V to 20V Input Voltage Range nn Wide Output Voltage Range of 0.6V to 97% VIN Opti- mized for 0.6V to 6V nn Low RDS(ON) Integrated Switches Provide Up to 95% Efficiency nn Up to 2.5A of Output Current nn Average Input and Output Current Monitoring nn Programmable Average Input/Output Current Limit nn Die Temperature Monitor and Programmable Limit nn Adjustable Switching Frequency: 500k Hz to 3MHz nn External Frequency Synchronization nn Current Mode Operation for Excellent Line and Load Transient Response nn 0.6V Reference with 1% Accuracy Over Temperature nn User Selectable Burst Mode® Operation or Forced Continuous Operation nn Short-Circuit Protected nn Output Voltage Tracking Capability nn Power Good Status Output nn Available in Small, Thermally Enhanced, 20-Lead (3mm × 4mm) QFN Package Applications nn Distributed Power Systems nn Battery-Powered Instruments nn Point-of-Load Power Supply Description The LTC®3626 is a high efficiency, monolithic synchronous buck regulator using a phase-lockable controlled on-time, current mode architecture capable of supplying up to 2.5A of output current. The operating supply voltage range is 3.6V to 20V, making it suitable for a wide range of power supply applications. The operating frequency is programmable from 500k Hz to 3MHz with an external resistor allowing the use of small surface mount inductors. For applications sensitive to switching noise, the LTC3626 can be externally synchronized over the same frequency range. An internal phaselocked loop aligns the on-time of the top power MOSFET to the internal or external clock. This unique controlled on-time architecture is ideal for high step-down ratio applications that demand high switching frequencies and fast transient response. An internal phase lock loop servos the on-time of the internal one-shot timer to match the frequency of the internal clock or an...