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Maxim > Products > [Power and Battery Management]  [Military/Aerospace] 
MAX649, MAX651, MAX652
5V/3.3V/3V or Adjustable, High-Efficiency, Low-IQ, Step-Down DC-DC Controllers

Low Supply Current, High-Efficiency Over Wide Load Range


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Status
Active: In Production.

Data Sheet
FULL DATA SHEET (PDF, 280kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail

Description
The MAX649/MAX651/MAX652 BiCMOS, step-down DC-DC switching controllers provide high efficiency over three decades of load current. A unique, current-limited pulse-frequency-modulated (PFM) control scheme gives these devices the benefits of pulse-width-modulation (PWM) converters (high efficiency at heavy loads), while using only 100µA of supply current (vs. 2mA to 10mA for PWM converters). The result is high efficiency over loads ranging from 10mA to more than 2.5A.

These devices use miniature external components. Their high switching frequency (up to 300kHz) allows for less than 9mm diameter surface-mount inductors.

The MAX649/MAX651/MAX652 have dropout voltages less than 1V and accept input voltages up to 16.5V. Output voltages are preset at 5V (MAX649), 3.3V (MAX651), and 3V (MAX652). These controllers can also be adjusted to any voltage from 1.5V to the input voltage by using two resistors.

These step-down controllers drive external P-channel MOSFETs at loads greater than 10W. If less power is required, use the MAX639/MAX640/MAX653 step-down converters with on-chip FETs, which allow up to a 225mA load current.

Key Features   Applications/Uses
  • More than 90% Efficiency (10mA to 1.5A Loads)
  • More than 12.5W Output Power
  • 100µA Max Quiescent Supply Current
  • 5µA Max Shutdown Supply Current
  • Less than 1.0V Dropout Voltage
  • 16.5V Max Input Voltage
  • 5V (MAX649), 3.3V (MAX651), 3V (MAX652), or Adjustable Output Voltage
  • Current-Limited Control Scheme
  • Up to 300kHz Switching Frequency

 
  		• 5V to 3.3V Green PC Applications
  		• Battery-Powered Applications
  		• High-Efficiency Step-Down Regulation
  		• Minimum Component DC-DC Converters

Key Specifications:  Step-Down Switching Regulators
Part Number VIN
(V)		 VIN
(V)		 VOUT
(V)		 VOUT
(V)		 Preset 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
MAX649  4 16.5 1.5 16.5 5 2.5 2.5
Preset
Resistor
 1 300
CDIP(N)/8
PDIP(N)/8
SOIC(N)/8
 30.9 -
MAX651  3.3
CDIP(N)/8
PDIP(N)/8
SOIC(N)/8
 30.9 $2.54 @1k
MAX652  3
CDIP(N)/8
PDIP(N)/8
SOIC(N)/8
 82.6 -
See All Step-Down Switching Regulators (264)

Diagram
MAX649, MAX651, MAX652: Typical Operating Circuit
Typical Operating Circuit

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: 1-30 of 30

    MAX649 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX649MJA    
    		Active CDIP(N);8 pin;82.6 mm²
    Outline Drawing: 21-0045 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: J8-2*
    		-55°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX649EPA+    
    		Active PDIP(N);8 pin;79.7 mm²
    Outline Drawing: 21-0043 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: P8+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX649CPA    
    		Active PDIP(N);8 pin;79.7 mm²
    Outline Drawing: 21-0043 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: P8-2*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX649EPA    
    		Active PDIP(N);8 pin;79.7 mm²
    Outline Drawing: 21-0043 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: P8-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX649CSA+    
    		Active SOIC(N);8 pin;30.9 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0096 (PDF)
    Use pkgcode/variation: S8+4*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX649CSA+T    
    		Active

    Land Pattern: Not Available

    		0°C to +70°C See data sheet
    MAX649ESA+    
    		Active SOIC(N);8 pin;30.9 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0096 (PDF)
    Use pkgcode/variation: S8+4*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX649ESA+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX649CSA    
    		Active SOIC(N);8 pin;30.9 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0096 (PDF)
    Use pkgcode/variation: S8-4*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX649CSA-T    
    		Active

    Land Pattern: Not Available

    		0°C to +70°C See data sheet
    MAX649ESA    
    		Active SOIC(N);8 pin;30.9 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0096 (PDF)
    Use pkgcode/variation: S8-4*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX649ESA-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX651 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX651MJA    
    		Active CDIP(N);8 pin;82.6 mm²
    Outline Drawing: 21-0045 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: J8-2*
    		-55°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX651CPA    
    		Active PDIP(N);8 pin;79.7 mm²
    Outline Drawing: 21-0043 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: P8-2*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX651EPA    
    		Active PDIP(N);8 pin;79.7 mm²
    Outline Drawing: 21-0043 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: P8-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX651CSA+    
    		Active SOIC(N);8 pin;30.9 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0096 (PDF)
    Use pkgcode/variation: S8+4*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX651CSA+T    
    		Active

    Land Pattern: Not Available

    		0°C to +70°C See data sheet
    MAX651ESA+    
    		Active SOIC(N);8 pin;30.9 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0096 (PDF)
    Use pkgcode/variation: S8+4*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX651ESA+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX651CSA    
    		Active SOIC(N);8 pin;30.9 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0096 (PDF)
    Use pkgcode/variation: S8-4*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX651CSA-T    
    		Active

    Land Pattern: Not Available

    		0°C to +70°C See data sheet
    MAX651ESA    
    		Active SOIC(N);8 pin;30.9 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0096 (PDF)
    Use pkgcode/variation: S8-4*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX651ESA-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX652 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX652MJA    
    		Active CDIP(N);8 pin;82.6 mm²
    Outline Drawing: 21-0045 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: J8-2*
    		-55°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX652CPA    
    		Active PDIP(N);8 pin;79.7 mm²
    Outline Drawing: 21-0043 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: P8-2*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX652EPA    
    		Active PDIP(N);8 pin;79.7 mm²
    Outline Drawing: 21-0043 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: P8-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX652CSA    
    		Active SOIC(N);8 pin;30.9 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0096 (PDF)
    Use pkgcode/variation: S8-4*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX652CSA-T    
    		Active

    Land Pattern: Not Available

    		0°C to +70°C See data sheet
    MAX652ESA    
    		Active SOIC(N);8 pin;30.9 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0096 (PDF)
    Use pkgcode/variation: S8-4*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX652ESA-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet

    Notes and Comments
  		• Fixed or adjustable output voltage, step-down, PFM DC-DC controllers
  		• 5V (MAX649)
  		• 3.3V (MAX651)
  		• 3V (MAX652)

    Related Products
    MAX639, MAX640, MAX653 5V/3.3V/3V Adjustable, High-Efficiency, Low-IQ, Step-Down DC-DC Converters

    More Like This: View Product Families for Similar Products

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    Document Ref.: 19-0225; Rev 3; 1997-09-01
    This page last modified: 2007-05-30


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