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SC2596 Datasheet(PDF) 8 Page - Semtech Corporation |
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SC2596 Datasheet(HTML) 8 Page - Semtech Corporation |
8 / 13 page 8 © 2007 Semtech Corp. www.semtech.com SC2596 PRELIMINARY POWER MANAGEMENT Block Diagram + - Error Am p. AVCC GND UVLO + Thermal Shutdown VDDQ Vsense VTT Anti- Shoot- thru + Driver Circuit PVCC EN VREF Vref Buffer Description Description Description Description Description SC2596 is a low-voltage, low-dropout DDR termination regulator with separate power supply to support both DDR1 and DDR2 applications. AVCC and PVCC can be tied together for DDR1 and can also be separated for DDR2. SC2596 regulates VTT to the voltage of VREF. VTT will sink or source upto 2.5A. Internal shoot-through protec- tion ensure both top and bottom MOSFET will not con- duct while maintaining fast source-to-sink load transient. Thermal shut-down and internal current limit protect SC2596 from shorted load or over-heated VREF BUFF VREF BUFF VREF BUFF VREF BUFF VREF BUFF VREF is derived from VDDQ with an accurate divide by op-amps(VREF Buffer). It is capable to sink and source 30uA. It is used as the reference voltage to the Error amp. A 100nF or higher capacitor is recommended for VREF pin to ground; To enhance the noise immunity from board, an additional pull-down resistor (1M Ω) is recomanded as well from VREF pin to ground. ERROR AMP ERROR AMP ERROR AMP ERROR AMP ERROR AMP Low input offset op-amp for the main linear regulator. It controls the VTT output voltage and which side of the MOSFET to turn on (or turn off) to achieve zero shoot through current. ANTI-Shoot Thought Driver ANTI-Shoot Thought Driver ANTI-Shoot Thought Driver ANTI-Shoot Thought Driver ANTI-Shoot Thought Driver Buffer stage takes the error voltage to control MOSFET. Internal current limit is incorporated to protect from shorted load. THERMAL SHUTDOWN & UVLO THERMAL SHUTDOWN & UVLO THERMAL SHUTDOWN & UVLO THERMAL SHUTDOWN & UVLO THERMAL SHUTDOWN & UVLO The Thermal shutdown block prevent the junction tem- perature exceed 165 oC. UVLO circuit to ensure proper power is available for correct operation of the IC. |
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