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LTC1735CS 数据表(PDF) 1 Page - Linear Technology |
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LTC1735CS 数据表(HTML) 1 Page - Linear Technology |
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1 / 32 page  1 LTC1735 1735fc High Efficiency Synchronous Step-Down Switching Regulator The LTC ®1735 is a synchronous step-down switching regulator controller that drives external N-channel power MOSFETs using a fixed frequency architecture. Burst Mode TM operation provides high efficiency at low load currents. The precision 0.8V reference is compatible with future generation microprocessors. OPTI-LOOP compen- sation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The operating frequency (synchronizable up to 500kHz) is set by an external capacitor allowing maximum flexibility in optimizing efficiency. A forced continuous control pin reduces noise and RF interference and can assist second- ary winding regulation by disabling Burst Mode operation when the main output is lightly loaded. Protection features include internal foldback current lim- iting, output overvoltage crowbar and optional short- circuit shutdown. Soft-start is provided by an external capacitor that can be used to properly sequence supplies. The operating current level is user-programmable via an external current sense resistor. Wide input supply range allows operation from 4V to 30V (36V maximum). s Synchronizable/Programmable Fixed Frequency s OPTI-LOOP TM Compensation Minimizes COUT s ±1% Output Voltage Accuracy s Dual N-Channel MOSFET Synchronous Drive s Wide VIN Range: 4V to 36V Operation s VOUT Range: 0.8V to 6V s Internal Current Foldback s Output Overvoltage Crowbar Protection s Latched Short-Circuit Shutdown Timer with Defeat Option s Very Low Dropout Operation: 99% Duty Cycle s Forced Continuous Control Pin s Optional Programmable Soft-Start s Remote Output Voltage Sense s Power Good Output (LTC1735F Only) s Logic Controlled Micropower Shutdown: IQ < 25µA s LTC1435 Pin Compatible with Minor Component Changes s Available in 16-Lead Narrow SSOP, SO Packages and 20-Lead TSSOP Package (LTC1735F Only) Figure 1. High Efficiency Step-Down Converter , LTC and LT are registered trademarks of Linear Technology Corporation. Burst Mode and OPTI-LOOP are trademarks of Linear Technology Corporation. s Notebook and Palmtop Computers, PDAs s Cellular Telephones and Wireless Modems s DC Power Distribution Systems COSC RUN/SS TG BOOST LTC1735 CB 0.22 µF 100pF CC 330pF RC 33k RSENSE 0.005 Ω VOUT 1.6V 9A COUT: PANASONIC EEFUEOG181R CIN: MARCON THCR70E1H226ZT L1: PANASONIC ETQP6F2R0HFA RSENSE: IRC LRF2010-01-R005J 1000pF CSS 0.1 µF COSC 47pF + 4.7 µF + COUT 180 µF 4V ×4 SP CIN 22 µF 50V M1 FDS6680A M2 FDS6680A 1735 F01 DB CMDSH-3 D1 MBRS340T3 VIN 5V TO 24V L1 2 µH CC2 100pF R2 20k 1% R1 20k 1% SGND VOSENSE SENSE– SENSE+ INTVCC BG PGND ITH SW VIN FEATURES DESCRIPTIO APPLICATIO S TYPICAL APPLICATIO |
类似零件编号 - LTC1735CS |
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类似说明 - LTC1735CS |
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