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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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LTC4449 Datenblatt(PDF) 1 Page - Linear Technology |
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LTC4449 Datenblatt(HTML) 1 Page - Linear Technology |
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1 / 38 page  LTC3774 1 3774fc For more information www.linear.com/LTC3774 TYPICAL APPLICATION FEATURES DESCRIPTION Dual, Multiphase Current Mode Synchronous Controller for Sub-Milliohm DCR Sensing The LTC®3774 is a dual PolyPhase® current mode syn- chronous step-down switching regulator controller that drives power blocks, DRMOS or external gate drivers and power MOSFETs. It offers an LTC-proprietary technique that enhances the signal-to-noise ratio of the current sense signal, allowing the use of inductors with very low DC winding resistances as the current sense element for maximum efficiency and reduced jitter. The maximum current sense voltage is programmable from 10mV to 30mV. High speed, low offset remote sense differential amplifiers and a precise 0.6V reference provide accurateoutputvoltagesbetween0.6Vand3.5Vfromawide 4.5V to 38V input supply range. Soft recovery from output shorts or overcurrent minimizes output overshoot. Burst Mode® operation, continuous and pulse-skipping modes are supported. The constant operating frequency can be synchronized to an external clock or linearly programmed from200kHzto1.2MHz.UptosixLTC3774controllerscan be paralleled for 1-, 2-, 3-, 4-, 6-, 8- or 12-phase operation. The LTC3774 is available in a 36-lead (5mm × 6mm) QFN package. High Efficiency Dual Phase 1.5V/60A Step-Down Converter APPLICATIONS n Sub-Milliohm DCR Current Sensing n Operates with Power Blocks, DRMOS or External Gate Drivers and MOSFETs n Supports Phase Shedding and N+1 Phase Redundancy n Programmable DCR Temperature Compensation n ±0.75% Maximum Total DC Output Error Over Temperature n Dual Differential Remote Output Voltage Sense Amplifiers n Phase-Lockable Fixed Frequency Range: 200kHz to 1.2MHz n VIN Range: 4.5V to 38V n VOUT Range: 0.6V to 3.5V n Supports Smooth Start-Up into Pre-Biased Outputs n Programmable Soft-Start or VOUT Tracking n Hiccup Mode/Soft Recovery from Output Overcurrent n 36-Lead (5mm × 6mm) QFN Package n Computer Systems n Telecom and Datacom Systems n Industrial Equipment n DC Power Distribution Systems L , LT, LTC, LTM, Linear Technology, the Linear logo, PolyPhase and Burst Mode are registered trademarks and No RSENSE and Hot Swap are trademarks of Analog Devices, Inc. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 5481178, 5705919, 5929620, 6177787, 6580258, 6498466, 6611131, patent pending. 3774 TA01a VIN 4.5V TO 20V RUN1, 2 ILIM1, 2 HIZB1 HIZB2 PWM1 PWMEN1 VOSNS1– SNSA1+ SNS1– SNSD1+ VOSNS1+ ITH1 PHSMD CLKOUT PGOOD1,2 MODE/PLLIN PWM2 PWMEN2 GND VOSNS2– SNSA2+ SNS2– SNSD2+ FREQ VOSNS2+ ITH2 LTC3774 VIN 1/4 INTVCC TK/SS2 TK/SS1 INTVCC 37.5k 15k DRMOS DRMOS fIN 500kHz 0.33µH (0.32mΩ DCR) 0.33µH (0.32mΩ DCR) 10k 300µF 4V 330µF 4V 15k 0.1µF 4.7µF 2200pF + + VOUT 1.5V 60A 22µF 50V |
Ähnliche Teilenummer - LTC4449 |
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Ähnliche Beschreibung - LTC4449 |
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