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Maxim > Products > [Power and Battery Management] 
MAX1809
3A, 1MHz, DDR Memory Termination Supply


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Status
Active: In Production.

Data Sheet
FULL DATA SHEET (PDF, 808kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail

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.

An evaluation kit is available:  MAX1809EVKIT  

Key Features   Applications/Uses
  • 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

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

    Key Specifications:  Step-Down Switching Regulators
    Part Number VIN
    (V)    		 VIN
    (V)    		 VOUT
    (V)    		 VOUT
    (V)    		 Max. IOUT
    (A)    		 Max. IOUT
    (A)    		 Output Adjust. Method DC-DC Outputs Oper. Freq.
    (kHz)    		 Package/Pins Smallest Available Pckg.
    (mm2)    		 Price
    min max min max ≥ ≤ max w/pins See Notes
    MAX1809  3 5.5 1.1 5.5 3 3 Resistor 1 1000
    QFN/28
    QSOP/16
    TQFN/28
    		 26 $4.35 @1k
    See All Step-Down Switching Regulators (264)

    Diagram
    MAX1809: Typical Operating Circuit
    Typical Operating Circuit

    Evaluation Kits
  		• MAX1809EVKIT

    Reliability Reports
  		• Show FIT data for:
  		• Request Reliability Report for:

    Software/Models
    none

    Ordering Information
    Notes:

    1. Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
    2. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
    3. Part number suffixes: T or T&R = tape and reel;+ = RoHS/lead-free;# = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
    4. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.


    Devices: 1-10 of 10

    MAX1809 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1809EGI    
    		Active QFN;28 pin;26 mm²
    Outline Drawing: 21-0091 (PDF)
    Land Pattern: 90-0278 (PDF)
    Use pkgcode/variation: G2855-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1809EGI-T    
    		Active QFN;28 pin;26 mm²
    Outline Drawing: 21-0091 (PDF)
    Land Pattern: 90-0278 (PDF)
    Use pkgcode/variation: G2855-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1809EEE    
    		Active QSOP;16 pin;31 mm²
    Outline Drawing: 21-0055 (PDF)
    Land Pattern: 90-0167 (PDF)
    Use pkgcode/variation: E16-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1809EEE-T    
    		Active QSOP;16 pin;31 mm²
    Outline Drawing: 21-0055 (PDF)
    Land Pattern: 90-0167 (PDF)
    Use pkgcode/variation: E16-5*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1809EEE+  
    		Active QSOP;16 pin;31 mm²
    Outline Drawing: 21-0055 (PDF)
    Land Pattern: 90-0167 (PDF)
    Use pkgcode/variation: E16+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1809EEE+T    
    		Active QSOP;16 pin;31 mm²
    Outline Drawing: 21-0055 (PDF)
    Land Pattern: 90-0167 (PDF)
    Use pkgcode/variation: E16+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1809ETI    
    		Active TQFN;28 pin;26 mm²
    Outline Drawing: 21-0140 (PDF)
    Land Pattern: 90-0026 (PDF)
    Use pkgcode/variation: T2855-6*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1809ETI+  
    		Active TQFN;28 pin;26 mm²
    Outline Drawing: 21-0140 (PDF)
    Land Pattern: 90-0026 (PDF)
    Use pkgcode/variation: T2855+6*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1809ETI+T    
    		Active TQFN;28 pin;26 mm²
    Outline Drawing: 21-0140 (PDF)
    Land Pattern: 90-0026 (PDF)
    Use pkgcode/variation: T2855+6*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1809ETI-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet

    More Information
  		• New Product Press Release 2001-09-07 

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    Document Ref.: 19-2142; Rev 1; 2002-09-27
    This page last modified: 2007-07-26


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