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LTC3613 Datasheet(PDF) 1 Page - Linear Technology |
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LTC3613 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 36 page  LTC3613 1 3613fa TYPICAL APPLICATION FEATURES DESCRIPTION 24V, 15A Monolithic Step Down Regulator with Differential Output Sensing The LTC®3613 is a monolithic synchronous step-down switching regulator capable of regulating outputs from 0.6V to 5.5V with up to 15A output current. The controlled on-time constantfrequencyvalleycurrentmodearchitectureallowsfor both fast transient response and constant frequency switch- ing in steady-state operation, independent of VIN, VOUT and load. This also provides excellent current sharing capability. Differential output voltage sensing along with a precision internal reference combine to offer ±0.67% output regula- tion, even if the output ground reference deviates from local ground by 500mV. The switching frequency can be programmed from 200kHz to 1MHz with an external resis- tor. The switching frequency is also phase synchronizable to an external clock in applications where switching noise/ EMI reduction is crucial. Very low tONandtOFFtimesallowfornear0%andnear100% duty cycles, respectively. Voltage tracking soft start-up is providedfortrackingandsequencingapplications.Safetyfea- tures include output overvoltage protection, programmable current limit with foldback, and power good monitoring. High Efficiency High Power Step-Down Converter Efficiency and Power Loss vs Load Current APPLICATIONS n Wide VIN Range: 4.5V to 24V; VOUT Range: 0.6V to 5.5V at up to 15A n 0.67% Output Voltage Accuracy n Controlled On-Time Valley Current Mode Architecture, Excellent Current Sharing Capability n Frequency Programmable from 200kHz to 1MHz and Synchronizable to External Clock n RSENSE or Inductor DCR Current Sensing With Accurate Current Limit n Fast Transient Response n Differential Output Voltage Sensing Allowing 500mV Common Mode Remote Ground n tON(MIN) = 65ns; tOFF(MIN) = 105ns n Overvoltage Protection and Current Limit Foldback n Power Good Output Voltage Monitor n Voltage Tracking Start-Up n External VCC Input for Bypassing Internal LDO n Micropower Shutdown: IQ = 15μA n 7mm × 9mm 56-pin QFN Package n Distributed Power System n Point-of-Load Converters n Servers VRNG SVIN PVIN MODE/PLLIN VOUT PGOOD RUN SENSE– SENSE+ 100k 10Ω 10Ω INTVCC LTC3613 15k 10k 330μF ×2 0.47μH 1.5mΩ 0.1μF 4.7μF 82μF VOUT 1.5V 15A 3613 TA01 VIN 4.5V TO 24V 0.1μF 1000pF TRACK/SS ITH RT 115k 270pF 47pF 0.1μF 21k EXTVCC SGND BOOST SW INTVCC PGND VOSNS + VOSNS – + + L, LT, LTC, LTM, OPTI-LOOP, Linear Technology and the Linear logo are registered trademarks and Hot Swap and No RSENSE is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 5481178, 5487554, 6580258, 6304066, 6476589, 6774611. LOAD CURRENT (A) 0.01 0 10 20 30 40 50 60 70 80 90 100 0.1 1 3613 TA01a 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 10 VIN = 12V VOUT = 1.5V PULSE-SKIPPING MODE FORCED CONTINUOUS MODE |
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