MAX1809

PRODUCTION

3A, 1MHz, DDR Memory Termination Supply

Data Sheet (Rev. 1) Product Selection Table

Part Models: 3
1ku List Price: Starting From $5.89

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Overview

Source/Sink 3A
±1% Output Accuracy
Up to 1MHz Switching Frequency
93% Efficiency
Internal PMOS/NMOS Switches
- 90mΩ/70mΩOn-Resistance at V_IN = 4.5V
- 110mΩ/80mΩ On-Resistance at V_IN = 3V
1.1V to V_IN 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

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 V_IN, 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.

Applications

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

Part Models: 3
1ku List Price: Starting From $5.89

Documentation

Data Sheet 1

MAX1809: 3A, 1MHz, DDR Memory Termination Supply Data Sheet (Rev.1) 09/27/2002

Reliability Data 1

MAX1809 Reliability Data 01/12/2023

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
MAX1809EEE+	16-QSOP-150_MIL	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX1809EEE+T	16-QSOP-150_MIL	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX1809ETI+T	28-LFCSP-5X5X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Jun 20, 2016 - 1612 ASSEMBLY
		pcn_1612
MAX1809ETI+T		pcn_1612

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Evaluation Kits

Evaluation Kit for the MAX1809

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Features and Benefits

±3A Output Current
Up to 1MHz Switching Frequency
Up to 93% Efficiency
Synchronous Rectification for Improved Efficiency
Output Voltage: +1.1V to V_IN Adjustable
+3V to +5.5V Input Voltage Range
Less than 1µA Typical IC Shutdown Current
Surface-Mount Construction
Fully Assembled and Tested

Product Details

The MAX1809 evaluation kit (EV kit) provides a +1.1V output voltage from a +3V to +5.5V input source. It sources and sinks up to 3A of current. The MAX1809 is a step-down switching regulator with an internal synchronous-rectifier that operates up to 1MHz, minimizing external components. The device features a resistor-programmable, fixed off-time current-mode operation for superior load- and line-transient response, and achieves efficiencies up to 93%.