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LTC1736IG Datasheet(PDF) 1 Page - Linear Technology |
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LTC1736IG Datasheet(HTML) 1 Page - Linear Technology |
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1 / 28 page  1 LTC1736 5-Bit Adjustable High Efficiency Synchronous Step-Down Switching Regulator Figure 1. High Efficiency Step-Down Converter s Dual N-Channel MOSFET Synchronous Drive s Synchronizable/Programmable Fixed Frequency s Wide VIN Range: 3.5V to 36V Operation s 5-Bit Digital-to-Analog VOUT Selection: 0.925V to 2.00V Range with 50mV/25mV Steps s OPTI-LOOP TM Compensation Minimizes COUT s ±1% Output Voltage Accuracy s Power Good Output Voltage Monitor s Active Voltage Positioning Compatible s Output Overvoltage Crowbar Protection s Internal Current Foldback s Latched Short-Circuit Shutdown Timer with Defeat Option s Forced Continuous Control Pin s Optional Programmable Soft-Start s Remote Output Voltage Sense s Available in 24-Lead SSOP Package s Notebook and Palmtop Computers, PDAs s Power Supply for Mobile Pentium ® II and Pentium III Processors s Low Voltage Power Supplies The LTC ®1736 is a synchronous step-down switching regulator controller optimized for CPU power. The output voltage is programmed by a 5-bit digital-to-analog con- verter (DAC) that adjusts the output voltage from 0.925V to 2.00V according to Intel mobile VID specifications. The 0.8V reference is compatible with future microprocessor generations. The operating frequency (synchronizable up to 500kHz) is set by an external capacitor allowing maximum flexibility in optimizing efficiency. The output voltage is monitored by a power good window comparator that indicates when the output is within 7.5% of its programmed value. Protection features include: internal foldback current lim- iting, output overvoltage crowbar and optional short-cir- cuit shutdown. Soft-start is provided by an external capaci- tor that can be used to properly sequence supplies. The operating current level is user-programmable via an exter- nal current sense resistor. Wide input supply range allows operation from 3.5V to 30V (36V maximum). Pin defeatable Burst Mode TM operation provides high effi- ciency at low load currents. OPTI-LOOP compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. , LTC and LT are registered trademarks of Linear Technology Corporation. OPTI-LOOP and Burst Mode are trademarks of Linear Technology Corporation. Pentium is a registered trademark of Intel Corporation. VOSENSE ITH 47pF CC1 330pF CB 0.22 µF DB CMDSH-3 VIN 5V TO 24V COSC 47pF RUN/SS PGND BG 1000pF BOOST SW VIDVCC INTVCC 4.7 µF M2 FDS6680A ×2 M1 FDS6680A COUT: PANASONIC EEFUEOG181R CIN: MARCON THCR70EIH226ZT L1: PANASONIC ETQP6RZIR20HFA RSENSE: IRC LRF2010-01-R004J D1 MBRS340T3 1736 F01 CSS 0.1 µF CC2 47pF COSC RC 33k RSENSE 0.004 Ω PGOOD VID4 VID3 VID2 VID1 VID0 SGND SENSE – LTC1736 SENSE + TG VIN + COUT 180 µF/4V ×4 CIN 22 µF/50V ×2 CERAMIC VOUT 1.35V TO 1.60V 12A + L1 1.2 µH FEATURES DESCRIPTIO APPLICATIO S TYPICAL APPLICATIO |
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