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LTM4619 Datasheet(PDF) 1 Page - Linear Technology |
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LTM4619 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 24 page  LTM4619 1 4619f TYPICAL APPLICATION DESCRIPTION Dual, 26VIN, 4A DC/DC µModule Regulator The LTM®4619 is a complete dual 4A step-down switch- ing mode DC/DC power supply. Included in the package are the switching controller, power FETs, inductor, and all support components. Operating over input voltage ranges of 4.5V to 26.5V, the LTM4619 supports two outputs with voltage ranges of 0.8V to 5V, each set by a single external resistor. Its high efficiency design delivers 4A continuous current (5A peak) for each output. High switching frequency and a current mode architecture enable a very fast transient response to line and load changes without sacrificing stability. The two outputs are interleaved with 180° phase to minimize the ripple noise and reduce the I/O capacitors. The device supports frequency synchronization and output voltage tracking for supply rail sequencing. Burst Mode operation or pulse-skipping mode can be selected for light load operations. Fault protection features include overvoltage protection, overcurrent protection and foldback current limit for short-circuit protection. The low profile package (2.8mm) enables utilization of unused space on the bottom of PC boards for high density point of load regulation. The power module is offered in a space saving and thermally enhanced 15mm × 15mm × 2.8mm LGA package. The LTM4619 is Pb-free and RoHS compliant. Dual 4A 3.3V/2.5V DC/DC μModule ® Regulator FEATURES APPLICATIONS n Complete Standalone Power Supply n Wide Input Voltage Range: 4.5V to 26.5V (EXTVCC Available for VIN ≤ 5.5V) n Dual 180° Out-of-Phase Outputs with 4A DC Typical, 5A Peak Output Current for Each n Dual Outputs with 0.8V to 5V VOUT Range n Output Voltage Tracking n ±1.5% Total DC Output Error n Current Mode Control/Fast Transient Response n Power Good n Phase-Lockable Fixed Frequency 250kHz to 780kHz n On Board Frequency Synchronization n Parallel Current Sharing n Selectable Burst Mode® Operation n Output Overvoltage Protection n Small Surface Mount Footprint, Low Profile (15mm × 15mm × 2.8mm) LGA Package n Telecom and Networking Equipment n Servers n Storage Cards n ATCA Cards n Industrial Equipment n Point of Load Regulation Efficiency and Power Loss at 12V input 4619 TA01a VIN VFB1 COMP1 VOUT1 TK/SS1 RUN1 PGOOD FREQ/PLLFLTR VFB2 COMP2 VOUT2 TK/SS2 RUN2 EXTVCC INTVCC MODE/PLLIN LTM4619 SGND PGND 28k 19.1k 100μF 100μF VOUT2 3.3V/4A VOUT1 2.5V/4A 0.1μF 10μF 2 0.1μF 5.5V TO 26.5V 22pF 22pF LOAD CURRENT (A) 0 95 90 80 70 85 75 60 65 55 2.0 1.5 1.0 0.5 0 3 2 1 1.5 3.5 4619 TA01b 4 2.5 0.5 2.5VOUT 3.3VOUT EFFICIENCY POWER LOSS L, LT, LTC, LTM, Linear Technology, the Linear logo, Burst Mode and μModule are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. |
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