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LTC1775CS Datasheet(PDF) 1 Page - Linear Technology |
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LTC1775CS Datasheet(HTML) 1 Page - Linear Technology |
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1 / 24 page  1 LTC1775 DESCRIPTIO FEATURES APPLICATIO S TYPICAL APPLICATION High Power No RSENSE TM Current Mode Synchronous Step-Down Switching Regulator s Highest Efficiency Current Mode Controller s No Sense Resistor Required s 300mV Maximum Current Sense Voltage s Stable High Current Operation s Dual N-Channel MOSFET Synchronous Drive s Wide VIN Range: 4V to 36V s Wide VOUT Range: 1.19V to VIN s ±1% 1.19V Reference s Programmable Fixed Frequency with Injection Lock s Very Low Drop Out Operation: 99% Duty Cycle s Forced Continuous Mode Control Pin s Optional Programmable Soft Start s Pin Selectable Output Voltage s Foldback Current Limit s Output Overvoltage Protection s Logic Controlled Micropower Shutdown: IQ < 30µA s Available in 16-Lead Narrow SSOP and SO Packages The LTC ®1775 is a synchronous step-down switching regulator controller that drives external N-channel power MOSFETs using few external components. Current mode control with MOSFET VDS sensing eliminates the need for a sense resistor and improves efficiency. Largely similar to the LTC1625, the LTC1775 has twice the maximum sense voltage for high current applications. The frequency of a nominal 150kHz internal oscillator can be synchro- nized to an external clock over a 1.5:1 frequency range. Burst Mode TM operation at low load currents reduces switching losses and low dropout operation extends oper- ating time in battery-powered systems. A forced continu- ous mode control pin can assist secondary winding regulation by disabling Burst Mode operation when the main output is lightly loaded. Fault protection is provided by foldback current limiting and an output overvoltage comparator. An external ca- pacitor attached to the RUN/SS pin provides soft start capability for supply sequencing. A wide supply range allows operation from 4V (4.3V for LTC1775I) to 36V at the input and 1.19V to VIN at the output. Figure 1. High Efficiency Step-Down Converter Efficiency vs Load Current s Notebook Computers s Automotive Electronics s Battery Chargers s Distributed Power Systems , LTC and LT are registered trademarks of Linear Technology Corporation. No RSENSE and Burst Mode are trademarks of Linear Technology Corporation. + VIN TK SYNC LTC1775 RUN/SS VOSENSE TG SW CB 0.33µF DB CMDSH-3 CC 2.2nF RC 10k M2 SUD50N03-10 D1 MBRS340 M1 SUD50N03-10 CVCC 4.7 µF 1775 F01 L1 6 µH CIN 22 µF 30V ×4 BOOST INTVCC BG VPROG ITH SGND PGND + COUT 680 µF 6.3V VOUT 3.3V 10A VIN 5V TO 28V CSS 0.1µF + LOAD CURRENT (A) 0.01 70 90 95 100 0.1 1 10 1775 F01b 85 80 75 VIN = 10V f = 150kHz FCB = INTVCC VOUT = 5V VOUT = 3.3V |
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