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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SC1109BSTR датащи(PDF) 1 Page - Semtech Corporation |
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SC1109BSTR датащи(HTML) 1 Page - Semtech Corporation |
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1 / 19 page  POWER MANAGEMENT 1 www.semtech.com SC1109 Synchronous PWM Controller with Dual Low Dropout Regulator Controllers Features Applications Revision: May 13, 2004 Description Dual linear controllers LDOs track input voltage within 200mV (function of the MOSFETs used) until regulation Integrated drivers Power good signal (SC1109A, SC1109B) Soft start Lossless current sense Programmable over current limit (SC1109C) 200kHz (SC1109A, SC1109C), and 500kHz (SC1109B) fixed frequency. Pentium® III Motherboards Triple power supplies The SC1109 was designed for the latest high speed motherboards. It combines a synchronous voltage mode controller (switching section) with two low-dropout linear regulator controllers. The voltage mode controller pro- vides the power supply for the system AGTL bus. The Dual linear controllers power the chip set and clock circuitry. The SC1109A switching section features lossless current sensing, while SC1109C provides programmable over cur- rent limit. SC1109 also utilizes latched driver outputs for enhanced noise immunity. SC1109A and SC1109C oper- ate at a fixed frequency of 200kHz, and the SC1109B is available at a fixed frequency of 500kHz. The VTT output voltage is internally fixed at 1.2V The SC1109 linear sections are low dropout regulators designed to track the 3.3V power supply when it turns on or off. The voltage for the linear controllers LDO1, and LDO2 are 1.8V/1.5V. Typical Application Circuit R2 2.2 + C7 3x1500uF C5 0.1uF Q4 MOSFET N C6 0.1uF LDO1 = 1.8V LDO2 = 1.5V + C12 330uF Q3 MOSFET N R1 2.2 C9 0.1uF C3 0.1uF Q1 MOSFET N 5V STBY Q2 MOSFET N VTT + C2 2x1500uF + C11 330uF 5V IN + C10 330uF U1 SC1109CCSTR 12 5 3 7 6 9 10 13 14 4 11 8 15 2 1 16 OCSET BCAP- STBY PHASE GND DH BST VOSENSE SS/EN BCAP+ VCC DL GATE2 GATE1 LDOS1 LDOS2 C8 0.1uF C1 0.1uF R3 TBD L1 4uH 12V IN 3.3V IN C4 0.1uF C13 1nF 1.2V 6A OCSET C6 0.1uF Q2 MOSFET N + C7 3x1500uF Q3 MOSFET N Q1 MOSFET N C5 0.1uF + C11 330uF U1 SC1109ACSTR or SC1109BCSTR 12 5 3 7 6 9 10 13 14 4 11 8 15 2 1 16 PWRGD BCAP- STBY PHASE GND DH BST VOSENSE SS/EN BCAP+ VCC DL GATE2 GATE1 LDOS1 LDOS2 L1 4uH C1 0.1uF + C10 330uF LDO2 = 1.5V 5V STBY POWER GOOD 12V IN C8 0.1uF + C12 330uF + C2 2x1500uF C9 0.1uF LDO1 = 1.8V 3.3V IN C3 0.1uF VTT R2 2.2 1.2V 6A 5V IN R1 2.2 Q4 MOSFET N C4 0.1uF |
Аналогичный номер детали - SC1109BSTR |
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Аналогичное описание - SC1109BSTR |
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