SC2596 Semtech Corporation, SC2596 Datasheet - Page 8

• Manufacturer Part Number: SC2596
• Description: Low Voltage Integrated DDR Termination Regulator
• Manufacturer: Semtech Corporation

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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 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 (1MΩ) is
recomanded as well from VREF pin to ground.
© 2007 Semtech Corp.
Description
Description
VREF BUFF
VREF BUFF
POWER MANAGEMENT
Block Diagram
VDDQ
AVCC
VREF
EN
Vref Buffer
+
-
Error Am p.
+
-
UVLO +
Thermal
Shutdown
8
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
power is available for correct operation of the IC.
Anti-
Shoot-
thru
Driver
Circuit
+
o
C. UVLO circuit to ensure proper
PRELIMINARY
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SC2596
PVCC
GND
VTT
Vsense