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LTC1703 Datasheet(PDF) 1 Page - Linear Technology |
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LTC1703 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 36 page  1 LTC1703 + PVCC BOOST1 BG1 TG1 SW1 IMAX1 FCB RUN/SS1 COMP1 SGND FB1 SENSE VID0 VID1 IMAX2 BOOST2 BG2 TG2 SW2 PGND FAULT RUN/SS2 COMP2 FB2 VCC VID4 VID3 VID2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 LTC1703 DCP1 MBR0520LT1 DCP2 MBR0520LT1 QT2 QB2 QT1 CSS1 0.22 µF R21 100k R12 10.2k 0.1% R32 1k C11 220pF CCP2 1 µF C21 15pF RIMAX2 20k 1 µF CSS2 0.22 µF C32 2200pF C22 15pF C12 220pF 1 µF C31 220pF R31, 10k RIMAX1,18.7k RB2 11.5k 0.1% R22, 100k VOUT1 0.9V TO 2V 15A GND L1 1 µH CCP1 1 µF QB1B QB1A COUT1 180 µF 4V × 6 CIN 150 µF 10V × 2 VIN 4.5V TO 5.5V VOUT2 1.5V 3A 1703 TA01 VID0 VID1 VID2 VID3 VID4 L1: MURATA LQT12535C1R5N12 L2: COILTRONICS UP2B-2R2 QT1, QB1A, QB1B: INTERNATIONAL RECTIFIER IRF7811 QT2, QB2: 1/2 FAIRCHILD NDS8926 L2 2.2 µH + COUT2 180 µF 4V + 10 Ω GND GND Dual 550kHz Synchronous 2-Phase Switching Regulator Controller with 5-Bit VID The LTC ®1703 is a dual switching regulator controller opti- mized for high efficiency with low input voltages. It includes two complete, on-chip, independent switching regulator controllers. Each is designed to drive a pair of external N-channel MOSFET devices in a voltage mode feedback, synchronous buck configuration. The LTC1703 includes digital output voltage adjustment on side 1 that conforms to the Intel Mobile VID specification. It uses a constant- frequency, true PWM design switching at 550kHz, minimiz- ing external component size and cost and optimizing load transient performance. The synchronous buck architecture automatically shifts to discontinuous and then to Burst Mode TM operation as the output load decreases, ensuring maximum efficiency over a wide range of load currents. The LTC1703 features an onboard reference trimmed to 1% and delivers better than 1.5% regulation at the converter outputs. An optional latching FAULT mode protects the load if the output rises 15% above the intended voltage. Each channel can be enabled independently; with both channels disabled, the LTC1703 shuts down and supply current drops below 100 µA. s Two Independent PWM Controllers in One Package s Side 1 Output Is Compliant with Intel Mobile VID Specifications (Includes 5-Bit DAC) s 0.9V to 2.0V Output Voltage with 25mV/50mV Steps s Two Sides Run Out-of-Phase to Minimize CIN s All N-Channel External MOSFET Architecture s No External Current Sense Resistor s Precision Internal 0.8V ±1% Reference s 550kHz Switching Frequency Minimizes External Component Size s Very Fast Transient Response s Up to 25A Output Current per Channel s Low Shutdown Current: < 100 µA s Small 28-Pin SSOP Package , LTC and LT are registered trademarks of Linear Technology Corporation. Burst Mode is a trademark of Linear Technology Corporation. Pentium is a registered trademark of Intel Corporation. s Mobile Pentium ® III Processor Systems s Microprocessor Core and I/O Supplies s Multiple Logic Supply Generator s High Efficiency Power Conversion Dual Output Mobile Pentium III Processor Supply FEATURES DESCRIPTIO APPLICATIO S TYPICAL APPLICATIO |
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