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LTC1705EGN Datasheet(PDF) 1 Page - Linear Technology |
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LTC1705EGN Datasheet(HTML) 1 Page - Linear Technology |
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1 / 28 page  LTC1705 1 DESCRIPTIO FEATURES APPLICATIO S TYPICAL APPLICATIO The LTC ®1705 is a complete power supply controller for Intel Mobile Pentium processors. It includes two switch- ing regulator controllers, each designed to drive a pair of N-channel MOSFETs in a voltage mode feedback, syn- chronous buck configuration, to provide the core and I/O supplies. The core controller includes a 5-bit DAC that conforms to the Intel Mobile VID specification. The IC also includes a low dropout linear regulator (LDO) that delivers up to 150mA of output current to provide the CLK supply. The LTC1705 uses a constant-frequency 550kHz PWM architecture, minimizing external component size and cost, as well as optimizing load transient performance. It provides better than 1.25% DC accuracy at its core output, and 2% at I/0 and CLK outputs. The high performance feedback loops allow the circuit to keep total output regulation within ±5% under all transient conditions. An open-drain PGOOD flag indicates that all three outputs are within ±10% of their regulated values. A shutdown circuit disables all three outputs if the RUN/SS pin is pulled to ground. In this mode, the LTC1705 supply current drops to below 100 µA. s Complete Power Supply Controller for Intel Mobile Pentium ® Processors s Intel Mobile Pentium Core, I/O, Clock Supplies s Multiple Logic Supply Generator , LTC and LT are registered trademarks of Linear Technology Corporation. s Three Regulated Outputs: Core, I/O and CLK in One Package s Integrated Intel Mobile 5-Bit VID DAC s No External Current Sense Resistors s All N-Channel External MOSFET Architecture s 550kHz Switching Frequency Minimizes External Component Size and Cost s Integrated 150mA LDO Linear Regulator s Excellent DC Accuracy: 1.25% for Core, 2% for I/O and CLK Supplies s PGOOD Flag Monitors All Three Outputs s High Efficiency Over Wide Load Current Range s Low Shutdown Current: < 100 µA s Switchers Run Out-of-Phase to Minimize CIN s Small 28-Pin Narrow SSOP Package Dual 550kHz Synchronous Switching Regulator Controller with 5-Bit VID and 150mA LDO Pentium is a registered trademark of Intel Corporation. Intel Mobile Pentium VRM Supply SWC BGC IMAXC 6 4 8 SENSEC 13 RIMAXC, 27k COUTC 180 µF 4V ×6 LC 0.68 µH QBCA QBIO QBCB PVCC PGOOD LTC1705 VID4:0 5-BIT VID VCC TGC 5 222 19 BOOSTC 3 + COUTIO 100 µF 10V ×2 + CIN 330 µF 10V ×3 1 µF VIN 5V VOUTC 0.9V TO 2V 15A + QTCB QTIO CCPC 1 µF DCPC MBR 0520LT1 QTCA RIMAXI0, 16k LIO 3 µH VOUTIO 1.5V 3A VOUTCLK 2.5V 150mA FBC 11 R31 1.8k R21, 11k COMPC 10 RPGOOD 5k CCPIO 1 µF DCPIO MBR 0520LT1 10 Ω 10 µF C31 1800pF 1 µF CVOUTCLK 10 µF 10V CVINCLK 10 µF 10V 1 µF 1705 TA01 + C11 1800pF C21 330pF C22 100pF 1 µF C12 2200pF RB2 10k 1% RUN/SS 9 PGND 7 CSS 0.1 µF 10k SHUTDOWN CIN: KEMET T510X337K010AS COUTC: PANASONIC EEFUE0G181R COUTIO: AVX TPS0107M010R0065 LC: SUMIDA CEP125-4712-T007 LIO: SUMIDA CDRH6D28-3R0 QTCA, QTCB, QBCA, QBCB: FAIRCHILD FDS6670A QTIO, QBIO: 1/2 FAIRCHILD NDS8926 VINCLK 3.3V + GND 12 14–18 SWIO BGIO IMAXIO 25 28 1 COMPIO 21 TGIO 26 BOOSTIO 27 FBIO 20 VINCLK 24 VOUTCLK 23 R22, 11k R12 8.87k 1% |
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Similar Description - LTC1705EGN |
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