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SC2434SWTR Datasheet(PDF) 1 Page - Semtech Corporation |
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SC2434SWTR Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 19 page  1 www.semtech.com POWER MANAGEMENT SC2434 TriPhase Current Mode Controller with Power Good May 18, 2005 Description Features The SC2434, a tri-phase, current mode controller is designed to work with Semtech smart synchronous drivers, such as the SC1205, SC1206, and SC1207 to provide the DC/DC converter solution for the most demanding Microprocessor applications. Input current sensing is used to guarantee precision phase to phase current matching using a single sense resistor on the input power line. This topology reduces the power loss and complexity associated with output current sense methods. Multi phase operation allows significant reduction in input/output ripple while enhancing transient response. Two or three phase operation is selectable. The DAC step size and range are program- mable with external components thus allowing compliance with new and emerging VID ranges. A novel approach implements active droop to minimize output capacitors during load transients. ! 12V input ! Input sensing current mode control ! Selectable 2 or 3 phase operation ! Precision, pulse by pulse phase current matching ! Active drooping allows for best transient response ! Programmable internal oscillator to 1.5 MHz ! Programmable DAC step size/offset allows compli- ance with VRM9.0 and VRM9.2 ! VID 11111 Inhibit (No CPU) ! Externally programmable soft-start ! 0% minimum duty cycle improves transient response ! Cycle by cycle current limiting plus hiccup ! Power good signal ! Intel Pentium-4 microprocessors ! ! ! ! ! High performance desktop systems Typical Application Circuit Applications +12V C17 1uF D1 1N4148 +5V R2 2R2 R9 2R2 L4 600nH +5V_ATX C6 4.7uF C21 1500uF/6.3V D6 1N4148 + C2 2200uF/16v VID0 C24 1uF R_OS 46.4K C26 1500uF/6.3V C23 2.2nF C7 1500uF/6.3V D3 1N4148 C16 4.7uF M4 C10 1500uF/6.3V U1 SC1205 1 2 3 4 5 6 7 8 DRN TG BST CO EN VS BG PGND C5 4.7uF M5 R4 1R C18 1500uF/6.3V R29 100 VCCVID_PWRGD(Open Collector Input) C32 1500uF/6.3V +12V VOUT C35 1uF C4 1uF C9 1nF M6 Differential Pair R_COMP 75K C15 1uF +12V C22 1nF L1 600nH U2 SC2434 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 VID4 VID3 VID2 VID1 VID0 PGIN ERROUT PGOUT FB OSCREF DACREF OC+ OC- AGND PC OUT3 OUT2 OUT1 BGOUT VCC D2 1N4148 R10 1R R5 20 D5 1N4148 C34 2.2nF C28 1500uF/6.3V R15 1K R_OSC 31.6K C27 1uF L2 600nH VID4 M3 R17 1 SM/R_1206 Differential Pair M2 R14 2R2 R6 1 SM/R_1206 C76 0.33uF C75 0.33uF C11 2.2nF U3 SC1205 1 2 3 4 5 6 7 8 DRN TG BST CO EN VS BG PGND C33 1nF C30 1500uF/6.3V C14 1500uF/6.3V R1 3m R16 1R M1 + C1 2200uF/16v V_PULL_UP C19 1500uF/6.3V R_FB 10K C20 1500uF/6.3V C77 0.33uF R_DRP 187K D4 1N4148 R3 2R2 C31 470pF R8 NO POP + C3 2200uF/16v VID3 R13 5.1K C25 1500uF/6.3V +5V C12 1uF AGND C13 10nF C_COMP 18pF +12V_ATX C29 100nF VID1 C8 1uF PWR_GOOD R19 750 VID2 U4 SC1205 1 2 3 4 5 6 7 8 DRN TG BST CO EN VS BG PGND PGND R_DAC 37.4K L3 600nH R11 1 SM/R_1206 R20 1K |
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