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UCC3585M Datasheet(PDF) 1 Page - Texas Instruments |
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UCC3585M Datasheet(HTML) 1 Page - Texas Instruments |
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1 / 21 page  UCC2585 UCC3585 SLUS304F − JULY 1999 − REVISED JANUARY 2005 LOW VOLTAGE SYNCHRONOUS BUCK CONTROLLER 1 www.ti.com FEATURES D VOUT Resistor Programmable Down to 0.9 V D 3.3-V or 5.0-V Input Supply D 1% DC Accuracy D High Efficiency Synchronous Switching D Drives P-Channel (High Side) and N-Channel (Low Side) MOSFETs D Lossless Programmable Current Limit D Logic Compatible Shutdown APPLICATIONS D Local Microprocessor Core Voltage Power Supplies for Desktop and Notebook Computers D DSP Core or I/O Powering D High-Speed GTL Bus Regulation DESCRIPTION The UCC3585 synchronous buck controller provides flexible high efficiency power conversion for output voltages as low as 0.9 V with ensured ±1% dc accuracy. With an input voltage range of 3.0 V to 5.5 V, it is the ideal choice for 3.3 V only, 5.0 V only, or other low voltage systems. The fixed frequency oscillator is capable of providing practical PWM operation to 500 kHz. The UCC3585 drives a complementary pair of power MOSFET transistors. A P-channel on the high side, and an N-channel on the low side step down the input voltage at up to 90% efficiency. A programmable two-level current limiting function is provided by sensing the voltage drop across the high side P-channel MOSFET. This circuit can be configured to provide pulse- by-pulse limiting, timed shutdown after seven consecutive faults, or latch-off after fault detec- tion, allowing maximum application flexibility. The current limit threshold can be programmed over a wide range with a single resistor. 12 14 6 11 8 PDRV CLSET ISENSE 13 5 9 NDRV PWRGND N/C N/C 1 4 10 2 15 VIN VFB ENB COMP SD 16 7 3SS GND CT ISET UCC3585 + + + ENABLE VIN RTN RTN UDG−01127 VOUT VIN = 3.3 V VOUT = 1.8 V IOUT = 3 A (max) R6 2 k Ω R5 2 k Ω R4 14 k Ω R3 100 k Ω C5 0.1 µ F C4 0.47 µ F R2 10 k Ω C1 150 µ F R1 10 k Ω C7 0.47 µ F C8 150 µ F C9 10 µ F C2 5600 pF C3 47 pF L1 3.7 µ H C6 470 pF Q1 SI4562DY PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright 2001, Texas Instruments Incorporated |
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