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LTC3633 数据表(PDF) 1 Page - Linear Technology |
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LTC3633 数据表(HTML) 1 Page - Linear Technology |
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1 / 28 page  LTC3633 1 3633f n 3.6V to 15V Input Voltage Range n 3A Output Current per Channel n Up to 95% Efficiency n Low Duty Cycle Operation: 5% at 2.25MHz n Selectable 0°/180° Phase Shift Between Channels n Adjustable Switching Frequency: 500kHz to 4MHz n External Frequency Synchronization n Current Mode Operation for Excellent Line and Load Transient Response n 0.6V Reference Allows Low Output Voltages n User Selectable Burst Mode® Operation or Forced Continuous Operation n Output Voltage Tracking and Soft-Start Capability n Short-Circuit Protected n Overvoltage Input and Overtemperature Protection n Low Power 2.5V Linear Regulator Output n Power Good Status Outputs n Available in (4mm × 5mm) QFN-28 and 28-Lead TSSOP Packages TYPICAL APPLICATION DESCRIPTION Dual Channel 3A, 15V Monolithic Synchronous Step-Down Regulator The LTC®3633 is a high efficiency, dual-channel monolithic synchronous buck regulator using a controlled on-time, current mode architecture, with phase lockable switching frequency. The two channels can run 180° out of phase, which relaxes the requirements for input and output ca- pacitance. The operating supply voltage range is from 3.6V to 15V, making it suitable for dual cell lithium-ion batteries as well as point of load power supply applications from a 12V or 5V supply. The operating frequency is programmable and synchroniz- able from 500kHz to 4MHz with an external resistor. The high frequency capability allows the use of small surface mount inductors and capacitors. The unique constant frequency/controlled on-time architecture is ideal for high step-down ratio applications that operate at high frequency while demanding 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 applied external clock. The LTC3633 can select between forced continuous mode and high efficiency Burst Mode operation. FEATURES APPLICATIONS n Distributed Power Systems n Battery Powered Instruments n Point of Load Power Supplies Efficiency vs Load Current L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks 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. 1 0 10 30 40 50 70 100 10000 3633 TA01b 20 80 100 90 60 10 1000 VOUT = 5V VOUT = 3.3V LOAD CURRENT (mA) Burst Mode OPERATION VIN = 12V RUN1 RUN2 TRACKSS2 PGOOD2 LTC3633 BOOST2 0.1μF 1.5μH 73.2k 10k SW2 VON2 VIN2 PGND SGND VIN1 VFB2 PHMODE TRACKSS1 PGOOD1 BOOST1 SW1 VON1 VFB1 22μF VOUT2 5V AT 3A 0.1μF 1μH 45.3k 10k 22μF VOUT1 3.3V AT 3A VIN 3.6V TO 15V 47μF x2 MODE/SYNC V2P5 RT ITH1 ITH2 INTVCC 2.2μF 3633 TA01a |
类似零件编号 - LTC3633 |
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类似说明 - LTC3633 |
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