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Maxim > Products > Power and Battery Management  Automotive 
MAX1652, MAX1653, MAX1654, MAX1655
High-Efficiency, PWM, Step-Down DC-DC Controllers in 16-Pin QSOP

10A DSP/CPU Core Supply with Secondary Outputs in Space-Saving QSOP Package


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Data Sheet
FULL DATA SHEET (PDF, 280kB)
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Description
The MAX1652-MAX1655 are high-efficiency, pulse-width-modulated (PWM), step-down DC-DC controllers in small QSOP packages. The MAX1653/MAX1655 also come in 16-pin narrow SO packages that are pin-compatible upgrades to the popular MAX797. Improvements include higher duty-cycle operation for better dropout, lower quiescent supply currents for better light-load efficiency, and an output voltage down to 1V (MAX1655).

The MAX1652-MAX1655 achieve up to 96% efficiency and deliver up to 10A using a unique Idle Mode™ synchronous-rectified PWM control scheme. These devices automatically switch between PWM operation at heavy loads and pulse-frequency-modulated (PFM) operation at light loads to optimize efficiency over the entire output current range. The MAX1653/MAX1655 also feature logic-controlled, forced PWM operation for noise-sensitive applications.

All devices operate with a selectable 150kHz/300kHz switching frequency, which can also be synchronized to an external clock signal. Both external power switches are inexpensive N-channel MOSFETs, which provide low resistance while saving space and reducing cost.

The MAX1652 and MAX1654 have an additional feedback pin that permits regulation of a low-cost second output tapped from a transformer winding. The MAX1652 provides an additional positive output. The MAX1654 provides an additional negative output.

The MAX1652-MAX1655 have a 4.5V to 30V input voltage range. The MAX1652/MAX1653/MAX1654's output range is 2.5V to 5.5V while the MAX1655's output range extends down to 1V. An evaluation kit (MAX1653EVKit) is available to speed designs.

Key Features   Applications/Uses
  • 96% Efficiency
  • Small, 16-Pin QSOP Package (half the size of a 16-pin narrow SO)
  • Pin-Compatible with MAX797 (MAX1653/MAX1655)
  • Output Voltage Down to 1V (MAX1655)
  • 4.5V to 30V Input Range
  • 99% Duty Cycle for Lower Dropout
  • 170µA Quiescent Supply Current
  • 3µA Logic-Controlled Shutdown
  • Dual, N-Channel, Synchronous-Rectified Control
  • Fixed 150kHz/300kHz PWM Switching, or Synchronized from 190kHz to 340kHz
  • Programmable Soft Start
  • Low-Cost Secondary Outputs (MAX1652/MAX1654)
  • Synchronous rectifier, secondary output regulation, high efficiency over full IOUT range

  
  		• Cell Phones
  		• Distributed Power
  		• Handheld Computers
  		• Handy Terminals
  		• Mobile Communications
  		• Notebook Computers
  		• PDAs

    Key Specifications:   Step-Down Switching Regulators
    Part Number VIN (min) (V) VIN (max) (V) Min. VOUT (V) Max. VOUT (V) Preset VOUT (V) IOUT (A) IOUT (A) Output Adj. Method Operating Current, ICC (max) (mA) Number of DC-DC Outputs Operating Freq. (kHz) Package Price**
    MAX1652  4.5 30 2.5 5.5 3.3 10 10 Preset
    Resistor     		0.364 2 340 QSOP/16 $3.50 @ 1k
    MAX1653  2.5 1 QSOP/16
    SOIC/16     		$3.50 @ 1k
    MAX1654  2.5 2 QSOP/16 $3.50 @ 1k
    MAX1655  1 1 QSOP/16
    SOIC/16     		$3.50 @ 1k
    See All Step-Down Switching Regulators (222)
    Notes:
    **This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

    Application Notes
  		• Application Note 716: Proper Layout and Component Selection Controls EMI - MAX1653
  		• Application Note 1882: Increase the Power of a Buck (Step-Down) Switching Power Supply IC - MAX1653

    Evaluation Kits
  		• MAX1653EVKIT

    Reliability Reports
  		• Show FIT data for:
  		• Reliability Report: MAX1652EEE.pdf MAX1653ExE.pdf MAX1655ExE.pdf
  		• AEC-Q100 Reliability Report MAX1655ESE.pdf
  		• 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: 1-24 of 24

    MAX1652 Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1652EEE+  
    		QSOP;16 pin;
    Dwg: 21-0055 (PDF)
    Use pkgcode/variation: E16+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1652EEE+T  
    		QSOP;16 pin;
    Dwg: 21-0055 (PDF)
    Use pkgcode/variation: E16+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1652EEE  
    		QSOP;16 pin;
    Dwg: 21-0055 (PDF)
    Use pkgcode/variation: E16-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1652EEE-T  



    		-40°C to +85°C See data sheet
    MAX1653 Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1653EEE-T  
    		QSOP;16 pin;
    Dwg: 21-0055 (PDF)
    Use pkgcode/variation: E16-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1653EEE+T  
    		QSOP;16 pin;
    Dwg: 21-0055 (PDF)
    Use pkgcode/variation: E16+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1653EEE  
    		QSOP;16 pin;
    Dwg: 21-0055 (PDF)
    Use pkgcode/variation: E16-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1653EEE+  
    		QSOP;16 pin;
    Dwg: 21-0055 (PDF)
    Use pkgcode/variation: E16+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1653ESE  
    		SOIC;16 pin;
    Dwg: 21-0041 (PDF)
    Use pkgcode/variation: S16-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1653ESE+T  
    		SOIC;16 pin;
    Dwg: 21-0041 (PDF)
    Use pkgcode/variation: S16+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1653ESE+  
    		SOIC;16 pin;
    Dwg: 21-0041 (PDF)
    Use pkgcode/variation: S16+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1653ESE-T  
    		SOIC;16 pin;
    Dwg: 21-0041 (PDF)
    Use pkgcode/variation: S16-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1654 Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1654EEE+  
    		QSOP;16 pin;
    Dwg: 21-0055 (PDF)
    Use pkgcode/variation: E16+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1654EEE+T  
    		QSOP;16 pin;
    Dwg: 21-0055 (PDF)
    Use pkgcode/variation: E16+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1654EEE-T  



    		-40°C to +85°C See data sheet
    MAX1654EEE  
    		QSOP;16 pin;
    Dwg: 21-0055 (PDF)
    Use pkgcode/variation: E16-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1655 Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1655EEE+  
    		QSOP;16 pin;
    Dwg: 21-0055 (PDF)
    Use pkgcode/variation: E16+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1655EEE+T  
    		QSOP;16 pin;
    Dwg: 21-0055 (PDF)
    Use pkgcode/variation: E16+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1655EEE-T  
    		QSOP;16 pin;
    Dwg: 21-0055 (PDF)
    Use pkgcode/variation: E16-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1655EEE  
    		QSOP;16 pin;
    Dwg: 21-0055 (PDF)
    Use pkgcode/variation: E16-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1655ESE+  
    		SOIC;16 pin;
    Dwg: 21-0041 (PDF)
    Use pkgcode/variation: S16+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1655ESE-T  
    		SOIC;16 pin;
    Dwg: 21-0041 (PDF)
    Use pkgcode/variation: S16-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1655ESE  
    		SOIC;16 pin;
    Dwg: 21-0041 (PDF)
    Use pkgcode/variation: S16-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1655ESE+T  
    		SOIC;16 pin;
    Dwg: 21-0041 (PDF)
    Use pkgcode/variation: S16+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis

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    Document Ref.: 19-1357; Rev 1; 1998-07-01
    This page last modified: 2007-06-01




             


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