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Maxim > Products > [Power and Battery Management] 
MAX1953, MAX1954, MAX1957
Low-Cost, High-Frequency, Current-Mode PWM Buck Controllers


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Status
Active: In Production.

Data Sheet
FULL DATA SHEET (PDF, 432kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail

Description
The MAX1953/MAX1954/MAX1957 is a family of versatile, economical, synchronous current-mode, pulse-width modulation (PWM) buck controllers. These step-down controllers are targeted for applications where cost and size are critical.

The MAX1953 operates at a fixed 1MHz switching frequency, thus significantly reducing external component size and cost. Additionally, excellent transient response is obtained using less output capacitance. The MAX1953 operates from low 3V to 5.5V input voltage and can supply up to 10A of output current. Selectable current limit is provided to tailor to the external MOSFETs' on-resistance for optimum cost and performance. The output voltage is adjustable from 0.8V to 0.86VIN.

With the MAX1954, the drain-voltage range on the high- side FET is 3V to 13.2V and is independent of the supply voltage. It operates at a fixed 300kHz switching frequency and can be used to provide up to 25A of output current with high efficiency. The output voltage is adjustable from 0.8V to 0.86VHSD.

The MAX1957 features a tracking output voltage range of 0.4V to 0.86VIN and is capable of sourcing or sinking current for applications such as DDR bus termination and PowerPC®/ASIC/DSP core supplies. The MAX1957 operates from a 3V to 5.5V input voltage and at a fixed 300kHz switching frequency.

The MAX1953/MAX1954/MAX1957 provide a COMP pin that can be pulled low to shut down the converter in addition to providing compensation to the error amplifier. An input undervoltage lockout (UVLO) is provided to ensure proper operation under power-sag conditions to prevent the external power MOSFETs from overheating. Internal digital soft-start is included to reduce inrush current. The MAX1953/MAX1954/MAX1957 are available in tiny 10-pin µMAX packages.

An evaluation kit is available:  MAX1953EVKIT  

Key Features   Applications/Uses
  • Low-Cost Current-Mode Controllers
  • Fixed-Frequency PWM
  • MAX1953
    • 1MHz Switching Frequency
    • Small Component Size, Low Cost
    • Adjustable Current Limit
  • MAX1954
    • 3V to 13.2V Input Voltage
    • 25A Output Current Capability
    • 93% Efficiency
    • 300kHz Switching Frequency
  • MAX1957
    • Tracking 0.4V to 0.86VIN Output Voltage Range Sinking and Sourcing Capability of 3A
  • Shutdown Feature
  • All N-Channel MOSFET Design for Low Cost
  • No Current-Sense Resistor Needed
  • Internal Digital† Soft-Start
  • Thermal Overload Protection
  • Small 10-Pin µMAX Package

 
  		• Graphic Cards and Video Cards
  		• Low-Voltage Distributed Power
  		• Microprocessor Core Supplies
  		• PCs and Servers
  		• Printers and Scanners
  		• Telecommunications and Networking

    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
    MAX1953  3 5.5 0.8 4.5 4 4 Resistor 1 1000
    µMAX/10
    		 15 $0.99 @1k
    MAX1954  13.2 0.8 25 25 300
    µMAX/10
    		 $0.95 @1k
    MAX1957  5.5 0.4 3 3 300
    µMAX/10
    		 $0.95 @1k
    See All Step-Down Switching Regulators (264)

    †Patent Pending

    Diagram
    MAX1953, MAX1954, MAX1957: Functional Diagram
    Functional Diagram

    Application Notes
  		• Application Note 1044: Design of Graphic Chip and Related Circuitry Power Supplies Using MAX1953 1MHz PWM Step-down Controller - MAX1953
  		• Application Note 1045: One Megahertz Adaptable Power Supply Meets XENPAK MSA Specification - MAX1953
  		• Application Note 1775: Power Supply for DDR-SDRAM Termination Operates From 3V to 5.5V Input - MAX1957
  		• Application Note 1781: Graphics Chip Supply Delivers 1.65V at 26A - MAX1954
  		• Application Note 3645: Correct Board Layout Lowers EMI of Switchmode Converters - MAX1954

    Evaluation Kits
  		• MAX1953EVKIT

    Reliability Reports
  		• Reliability Report: MAX1953.pdf MAX1954.pdf MAX1957.pdf
  		• Show FIT data 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: 1-17 of 17

    MAX1953 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1953EUB    
    		Active µMAX;10 pin;15 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: 90-0330 (PDF)
    Use pkgcode/variation: U10-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1953EUB-T    
    		Active µMAX;10 pin;15 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: 90-0330 (PDF)
    Use pkgcode/variation: U10-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1953EUB+  
    		Active µMAX;10 pin;15 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: 90-0330 (PDF)
    Use pkgcode/variation: U10+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1953EUB+T    
    		Active µMAX;10 pin;15 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: 90-0330 (PDF)
    Use pkgcode/variation: U10+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1954 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1954EVKIT    
    		Active

    Land Pattern: Not Available

    		See data sheet
    MAX1954EUB    
    		Active µMAX;10 pin;15 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: 90-0330 (PDF)
    Use pkgcode/variation: U10-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1954EUB-T    
    		Active µMAX;10 pin;15 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: 90-0330 (PDF)
    Use pkgcode/variation: U10-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1954EUB+  
    		Active µMAX;10 pin;15 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: 90-0330 (PDF)
    Use pkgcode/variation: U10+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1954EUB+T    
    		Active µMAX;10 pin;15 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: 90-0330 (PDF)
    Use pkgcode/variation: U10+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1954BEUB    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX1954CEUB    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX1954BEUB+    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX1954CEUB+    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX1957 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1957EUB    
    		Active µMAX;10 pin;15 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: 90-0330 (PDF)
    Use pkgcode/variation: U10-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1957EUB-T    
    		Active µMAX;10 pin;15 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: 90-0330 (PDF)
    Use pkgcode/variation: U10-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1957EUB+  
    		Active µMAX;10 pin;15 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: 90-0330 (PDF)
    Use pkgcode/variation: U10+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1957EUB+T    
    		Active µMAX;10 pin;15 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: 90-0330 (PDF)
    Use pkgcode/variation: U10+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis

    More Information
  		• New Product Press Release 2002-06-03  2002-05-09  2002-05-07 
  		• MAX1953, MAX1954Power Supply Cookbook

    Related Products
    MAX1917 Tracking, Sinking and Sourcing, Synchronous Buck Controller for DDR Memory and Termination Supplies
    MAX1864, MAX1865 xDSL/Cable Modem Triple/Quintuple Output Power Supplies
    MAX1964, MAX1965 Tracking/Sequencing Triple/Quintuple Power-Supply Controllers
    MAX1966, MAX1967 Low-Cost Voltage-Mode PWM Step-Down Controllers

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    Document Ref.: 19-2373; Rev 0; 2002-06-12
    This page last modified: 2009-10-14


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