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LTC1753 Datasheet(PDF) 1 Page - Linear Technology |
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LTC1753 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 24 page  1 LTC1753 5-Bit Programmable Synchronous Switching Regulator Controller for Pentium ® III Processor The LTC ®1753 is a high power, high efficiency switching regulator controller optimized for 5V input to a digitally programmable 1.3V-3.5V output. The internal 5-bit DAC programs the output voltage from 1.3V to 2.05V in 50mV increments and from 2.1V to 3.5V in 100mV increments. The precision internal reference and an internal feedback system provide an output accuracy of ±1.5% at room temperature and typically ±2% over temperature, load current and line voltage shifts. The LTC1753 uses a synchronous switching architecture with two external N-channel output devices, providing high efficiency and eliminating the need for a high power, high cost P-channel device. Additionally, it senses the output current across the on-resistance of the upper N- channel FET, providing an adjustable current limit without an external low value sense resistor. The LTC1753 free-runs at 300kHz and can be synchronized to a faster external clock if desired. It provides a phase lead compensation scheme and under harsh loading conditions, the PWM duty cycle can be momentarily forced to 0% or 100% to reduce the output voltage recovery time. Figure 1. 5V to 1.3V-3.5V Supply Application , LTC and LT are registered trademarks of Linear Technology Corporation. Pentium is a registered trademark of Intel Corporation. AMD-K6 is a registered trademark of Advanced Micro Devices, Inc. s 5-Bit Digitally Programmable 1.3V to 3.5V Fixed Output Voltage, VRM 8.4 Compliant s Fast Transient Response: 0% to 100% Duty Cycle s Phase Lead Compensation for Remote Sensing s Overtemperature Protection s Flags for Power Good and Overvoltage Fault s 19A Output Current Capability from a 5V Supply s Dual N-Channel MOSFET Synchronous Driver s Initial Output Accuracy: ±1.5% s Excellent Output Accuracy: ±2% Typ Over Line, Load and Temperature Variations s High Efficiency: Over 95% Possible s Adjustable Current Limit Without External Sense Resistors s Available in 2O-Lead SSOP and SW Packages s Power Supply for Pentium ® III, AMD-K6®-2, SPARC, ALPHA and PA-RISC Microprocessors s High Power 5V to 1.3V-3.5V Regulators PWRGD FAULT VID0 TO VID4 OUTEN COMP SS SGND GND SENSE 10 µF Q1* 20 Ω Q2* Q2A* Q1A* 0.1 µF VCC IMAX PVCC PVCC 12V VIN 5V LO† 1.3 µH 18A LTC1753 G1 IFB VFB + 1 µF NC 1753 F01 CC 4700pF RC 15k 600 Ω 5.6k 5.6k CSS 0.1 µF + 0.1 µF 10 µF CIN** 1200 µF × 4 VOUT 1.3V TO 3.5V 14A COUT†† 2700 µF × 5 + C1 150pF + 5 * SILICONIX SUD50N03-10 ** SANYO 10MV1200GX † PANASONIC ETQP 6FIR3LFA †† SANYO 6MV2700GX CPU G2 DESCRIPTIO FEATURES APPLICATIO S TYPICAL APPLICATIO |
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