SC1211

High Speed, Combi-SenseTM Synchronous MOSFET Driver POWER MANAGEMENT Description The SC1211 is a high speed, Combi-SenseTM, dual output driver designed to drive high-side and low-side MOSFETs in a synchronous Buck converter. These drivers combined with Combi-Sense PWM controllers, such as Semtech SC2643VX or SC2643, provide a cost effective multi-phase voltage regulator for advanced microprocessors The Combi-SenseTM is a technique to sense the inductor current for peak current mode control of voltage regulator without using sensing resistor. It provides the following advantages: - No costly precision sensing resistor - Lossless current sensing - High level noise free signal - Fast response - Suitable for wide range of duty cycle - Only two small signal components (third optional) The detailed explanation of the technique can be found in the Applications Information section. A 30ns max propagation delay from input transition to the gate of the power FET’s guarantees operation at high switching frequencies. Internal overlap protection circuit prevents shoot-through from Vin to PGND in the main and synchronous MOSFETs. The adaptive overlap protection circuit ensures the bottom FET does not turn on until the top FET source has reached 1V, to prevent crossconduction. 8.5V gate drive provides optimum enhancement of MOSFETs at minimum driver and MOSFET switching loss. High current drive capability allows fast switching, thus reducing switching losses at high (up to 1.5MHz) frequencies without causing thermal stress on the driver. Under-voltage-lockout and over-temperature shutdown features are included for proper and safe operation. Timed latches and improved robustness are built into the housekeeping functions such as the Under Voltage Lockout and adaptive Shoot-through protection circuitry to prevent false triggering and to assure safe operation. The SC1211 is offered in a Power SOIC-8L package. SC1211 Features u High efficiency u +12V supply voltage with internal LDO for optimum u u u u u u u u u u gate drive High peak drive current Adaptive non-overlapping gate drives provide shoot-through protection Support Combi-SenseTM and VID-on-fly operations Fast rise and fall times (15ns typical with 3000pf load) Ultra-low (