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LTC3601EMSE#PBF

製品説明
仕様・特性

LTC3601 1.5A, 15V Monolithic Synchronous Step-Down Regulator DESCRIPTION FEATURES 4V to 15V Operating Input Voltage Range nn 1.5A Output Current nn Up to 96% Efficiency nn Very Low Duty Cycle Operation: 5% at 2.25MHz nn Adjustable Switching Frequency: 800kHz to 4MHz nn External Frequency Synchronization nn Current Mode Operation for Excellent Line and Load Transient Response nn User Selectable Burst Mode® (No Load I = 300µA) or Q Forced Continuous Operation nn 0.6V Reference Allows Low Output Voltages nn Short-Circuit Protected nn Output Voltage Tracking Capability nn Programmable Soft-Start nn Power Good Status Output nn Available in Small, Thermally Enhanced 16-Pin QFN (3mm × 3mm) and MSOP Packages nn APPLICATIONS Distributed Power Systems Lithium-Ion Battery-Powered Instruments nn Point-of-Load Power Supply nn nn L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks and Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 5481178, 5847554, 6580258, 6304066, 6476589, 6774611. The LTC®3601 is a high efficiency, monolithic synchronous buck regulator using a phase-lockable controlled on-time, current mode architecture capable of supplying up to 1.5A of output current. The operating supply voltage range is from 4V to 15V, making it suitable for a wide range of power supply applications. The operating frequency is programmable from 800kHz to 4MHz with an external resistor enabling the use of small surface mount inductors. For switching noise sensitive applications, the LTC3601 can be externally synchronized over the same frequency range. An internal phase-locked loop aligns the on-time of the top power MOSFET to the internal or external clock. This unique constant frequency/ controlled on-time architecture is ideal for high step-down ratio applications that demand high switching frequencies and fast transient response. The LTC3601 offers two operational modes: Burst Mode operation and forced continuous mode to allow the user to optimize output voltage ripple, noise, and light load efficiency for a given application. Maximum light load efficiency is achieved with the selection of Burst Mode operation while forced continuous mode provides minimum output ripple and constant frequency operation. TYPICAL APPLICATION Efficiency and Power Loss vs Load Current 100 1000 90 0.1µF 2.2µH PGOOD TRACK SW VON LTC3601 2.2µF 80 BOOST INTVCC FB ITH RT MODE/SYNC SGND PGND 180k 10pF VOUT 3.3V 1.5A 22µF 40k 3601 TA01a EFFICIENCY (%) 22µF VIN RUN 70 100 60 50 40 10 30 POWER LOSS (mW) VIN 4V TO 15V 20 VIN = 5V VIN = 12V 10 0 0.001 0.01 0.1 1 LOAD CURRENT (A) 10 1 3601 TA01b 3601fc For more information www.linear.com/LTC3601 1

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