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Maxim > Products > [Power and Battery Management] 
MAX8553, MAX8554
4.5V to 28V Input, Synchronous PWM Buck Controllers for DDR Termination and Point-of-Load Applications

4.5V to 28V Input, Synchronous PWM Buck Controllers for DDR Termination and Point-of-Load Applications Offer Fastest Transient Response


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Status
Active: In Production.

Data Sheet
FULL DATA SHEET (PDF, 836kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail

Description
The MAX8553 is a 4.5V to 28V input-voltage, synchronous step-down controller that provides a complete power-management solution for DDR memory. The MAX8553 generates 1/2 VREFIN voltage for VTT and VTTR. The VTT and VTTR tracking voltages are maintained within 1% of 1/2 VREFIN. The MAX8554 is a 4.5V to 28V input-voltage, nontracking step-down controller with a low 0.6V feedback threshold voltage. The MAX8553/MAX8554 use Maxim's proprietary Quick-PWM™ architecture for fast transient response and operate with selectable pseudo-fixed frequencies. Both controllers can operate without an external bias supply.

The controllers operate in synchronous-rectification mode to ensure balanced current sourcing and sinking capability of up to 25A. The MAX8553/MAX8554 also provide up to 95% efficiency, making them ideal for server and point-of-load applications. Additionally, a low 5µA shutdown current allows for longer battery life in notebook applications. Lossless current monitoring is achieved by monitoring the low-side MOSFET's drain-to-source voltage. The MAX8553/MAX8554 have an adjustable foldback current limit to withstand a continuous output overload and short circuit. Digital soft-start provides control of inrush current during power-up. Overvoltage protection shuts the converter down and discharges the output capacitor. The MAX8553/MAX8554 come in space-saving 16-pin QSOP packages.

An evaluation kit is available:  MAX8554EVKIT  

Key Features   Applications/Uses
  • Up to 25A Output-Current Capability
  • Quick-PWM Control for Fast Loop Response
  • Up to 95% Efficiency
  • 4.5V to 28V Input Voltage Range
  • No External Bias Supply Required
  • 0 to 3.6V Input REFIN Range (MAX8553)
  • Automatically Sets VTT and VTTR to within ±1% of 1/2 VREFIN- (MAX8553)
  • Low 0.6V Feedback Threshold (MAX8554)
  • 200kHz/300kHz/400kHz/550kHz Selectable Switching Frequencies
  • Adjustable Foldback Current Limit
  • Overvoltage Protection
  • Digital Soft-Start

 
  		• AGTL Bus Termination Supplies
  		• ASIC and CPU Core Voltages
  		• DDR I and DDR II Memory Power Supplies
  		• Notebook and LCD-PC Power Supplies
  		• Servers and Storage Applications
  		• Wide-Input Power Supplies

    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
    MAX8553  4.5 28 0 3.6 25 25
    Dyn. REF In
    Resistor
    		 1 550
    QSOP/16
    		 31 $1.84 @1k
    MAX8554  0.6 3.5 Resistor
    QSOP/16
    		 $1.84 @1k
    See All Step-Down Switching Regulators (264)

    Diagram
    MAX8553, MAX8554: Typical Operating Circuit
    Typical Operating Circuit

    Evaluation Kits
  		• MAX8554EVKIT

    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: 1-8 of 8

    MAX8553 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX8553EEE    
    		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
    MAX8553EEE-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX8553EEE+  
    		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
    MAX8553EEE+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX8554 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX8554EEE    
    		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
    MAX8554EEE-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX8554EEE+  
    		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
    MAX8554EEE+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet

    More Information
  		• New Product Press Release 2003-12-02 
  		• MAX8554Power Supply Cookbook

    Related Products
    MAX1917 Tracking, Sinking and Sourcing, Synchronous Buck Controller for DDR Memory and Termination Supplies
    MAX1953, MAX1954, MAX1957 Low-Cost, High-Frequency, Current-Mode PWM Buck Controllers

    More Like This: View Product Families for Similar Products

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    Document Ref.: 19-3017; Rev 1; 2005-07-04
    This page last modified: 2007-08-21


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