DDR MEMORY TERMINATION SUPPLY
SUNNYVALE, CA-September 7, 2001-Maxim Integrated Products introduces the MAX1809, a reversible energy flow, constant-off-time, pulse-width modulated, step-down converter. It is ideal for use in notebook and subnotebook computers that require 1.1V to 5V active termination supplies. This device features an internal PMOS power switch and internal synchronous rectifier for high efficiency and reduced component count. The internal PMOS 90m ohm power switch and 70m ohm NMOS synchronous rectifier switch easily deliver continuous load currents up to ±3A.
The MAX1809 accurately tracks an external reference voltage, produces an adjustable output from 1.1V to VIN, and achieves efficiencies as high as 93%.
The MAX1809 features a unique current-mode constant-off-time PWM control scheme that allows the output to source or sink current. This feature allows energy to return to the input power supply that otherwise would be wasted. The programmable constant-off-time architecture sets switching frequencies up to 1MHz, allowing the user to optimize performance trade-off between efficiency, output switching noise, and component size.
The MAX1809 is available in a space-saving 28-pin 5 x 5 QFN and 16-pin QSOP package, and is screened for the extended-industrial temperature range (-40°C to +85°C). Prices start at $4.35 (1000-up, FOB USA). A preassembled MAX1809EVKIT is available with recommended external components to reduce design time.
|
