U U
FEATURES
s VOUT as Low as 0.4V s High Power Switching Regulator Controller
for DDR Memory Termination s VOUT Tracks...
U U
FEATURES
s VOUT as Low as 0.4V s High Power Switching
Regulator Controller
for DDR Memory Termination s VOUT Tracks 1/2 of VIN or External VREF s No Current Sense Resistor Required s Low VCC Supply: 3V to 8V s Maximum Duty Cycle > 91% Over Temperature s Drives All N-Channel External MOSFETs s High Efficiency: Up to 95% s Programmable Fixed Frequency Operation:
100kHz to 500kHz s External Clock Synchronization Operation s Programmable Soft-Start s Low Shutdown Current: <10µA s Overtemperature Protection
s Available in 16-PUin Narrow SSOP Package APPLICATIO S
s DDR SDRAM Termination s SSTL_2, SSTL_3 Interface s HSTL Interface
LTC3831-1
High Power Synchronous Switching
Regulator Controller
for DDR Memory Termination
DESCRIPTIO
The LTC®3831-1 is a high power, high efficiency switching
regulator controller designed for DDR memory termination. The LTC3831-1 generates an output voltage equal to 1/2 of an external supply or reference voltage. The LTC3831-1 uses a synchronous switching architecture with N-channel MOSFETs. Additionally, the chip senses output current through the drain-source resistance of the upper N-channel FET, providing an adjustable current limit without a current sense resistor.
The LTC3831-1 operates with input supply voltage as low as 3V and with a maximum duty cycle of > 91%. It includes a fixed frequency PWM oscillator for low output ripple operation. The 300kHz free-running clock frequency can be externally adjusted or synchronized with an external sign...
