MAX1809

3A, 1MHz, DDR Memory Termination Supply


Please check latest availability status for a specific part variant.

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 90mΩ PMOS 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 efficiency, 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.
MAX1809: Typical Operating Circuit MAX1809: Typical Operating Circuit Enlarge+

Key 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/80mΩ On-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

Applications/Uses

  • Active Termination Buses (MAX1993)
  • DDR Memory Termination (MAX1993)

See parametric specs for Step-Down Switching Regulators (409)


Part NumberVIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
Output Adjust. MethodIOUT1
(A)
Switch TypeSynchronous SwitchingDC-DC OutputsOper. Freq.
(kHz)
Package/PinsBudgetary
Price
minmaxminmaxmaxSee Notes
MAX1809 35.51.15.5Resistor3InternalYes11000
QFN/28
QSOP/16
TQFN/28
$5.19 @1k

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

MAX1809EVKIT: Evaluation Kit for the MAX1809
Product Reliability Reports: MAX1809.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

Quality Management System >
Environmental Management System >

 
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