MAX1809 3A, 1MHz, DDR Memory Termination Supply
■General Description
▲The MAX1809 is a reversible energy flow, constant-off-time, pulse-width modulated (PWM), step-down DC-DC converter. It is ideal for use in notebook and subnotebook computers that require 1.1V to 5V active termination power supplies. This device features an internal PMOS power switch and internal synchronous rectifier for high efficiency and reduced component count. The internal 90mΩPMOS power switch and 70mΩ 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 uses 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-offs between fficiency, output switching noise, component size, and cost. The MAX1809 features an adjustable soft-start to limit surge currents during startup, a 100% duty-cycle mode for low-dropout operation, and a low-power shutdown mode that disables the power switches and reduces supply current below 1μA. The MAX1809 is available in a 28-pin QFN with an exposed backside pad, a 28-pin thin QFN, or a 16-pin QSOP.
■Features
▲Source/Sink 3A
▲±1% Output Accuracy
▲Up to 1MHz Switching Frequency
▲93% Efficiency
▲Internal PMOS/NMOS Switches
♦90mΩ/70mΩOn-Resistance at VIN= 4.5V
♦110mΩ/80mΩOn-Resistance at VIN= 3V
▲1.1V to VIN Adjustable Output Voltage
▲3V to 5.5V Input Voltage Range
▲<1μA Shutdown Supply Current
▲Programmable Constant-Off-Time Operation
▲Thermal Shutdown
▲Adjustable Soft-Start Inrush Current Limiting
▲Output Short-Circuit Protection
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Datasheet |
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Please see the document for details |
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QFN;QSOP |
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English Chinese Chinese and English Japanese |
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9/02 |
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Rev 1 |
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19-2142 |
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1.1 MB |
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