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Maxim > Products > [Power and Battery Management] 
MAX1846, MAX1847
High-Efficiency, Current-Mode, Inverting PWM Controller


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Status
Active: In Production.

Data Sheet
FULL DATA SHEET (PDF, 352kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail

Description
  Notify me when the EE-Sim online simulation tool supports: [MAX1846]

MAX1846/MAX1847 high-efficiency PWM inverting controllers allow designers to implement compact, low-noise, negative-output DC-DC converters for telecom and networking applications. Both devices operate from +3V to +16.5V input and generate -500mV to -200V output. To minimize switching noise, both devices feature a current-mode, constant-frequency PWM control scheme. The operating frequency can be set from 100kHz to 500kHz through a resistor.

The MAX1846 is available in an ultra-compact 10-pin µMAX® package. Operation at high frequency, compatibility with ceramic capacitors, and inverting topology without transformers allow for a compact design. Compatibility with electrolytic capacitors and flexibility to operate down to 100kHz allow users to minimize the cost of external components. The high-current output drivers are designed to drive a P-channel MOSFET and allow the converter to deliver up to 30W.

The MAX1847 features clock synchronization and shutdown functions. The MAX1847 can also be configured to operate as an inverting flyback controller with an N-channel MOSFET and a transformer to deliver up to 70W. The MAX1847 is available in a 16-pin QSOP package.

Current-mode control simplifies compensation and provides good transient response. Accurate current-mode control and over current protection are achieved through low-side current sensing.

An evaluation kit is available:  MAX1846EVKIT, MAX1847EVKIT  

Key Features   Applications/Uses
  • 90% Efficiency
  • +3.0V to +16.5V Input Range
  • -500mV to -200V Output
  • Drives High-Side P-channel MOSFET
  • 100kHz to 500kHz Switching Frequency
  • Current-Mode, PWM Control
  • Internal Soft-Start
  • Electrolytic or Ceramic Output Capacitor
  • The MAX1847 also offers:
    • Synchronization to External Clock Shutdown
    • N-Channel Inverting Flyback Option

 
  		• Automotive Electronic Power Supplies
  		• Cell Phone Base Stations
  		• CO DSL Line Driver Supplies
  		• Industrial Power Supplies
  		• Network Equipment
  		• Optical Networking Equipment
  		• Servers
  		• SLIC Supplies
  		• VOIP Supplies

    Key Specifications:  Inverting 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
    MAX1846  3 16.5 -2 -200 5 5 Resistor 1 500
    µMAX/10
    		 15 $1.90 @1k
    MAX1847 
    QSOP/16
    		 31 $2.05 @1k
    See All Inverting Switching Regulators (25)

    Diagram
    MAX1846, MAX1847: Typical Operating Circuit
    Typical Operating Circuit

    Application Notes
  		• Application Note 735: Layout Considerations for Non-Isolated DC-DC Converters - MAX1846, MAX1847
  		• Application Note 3591: Compensation Calculator for the MAX1846/MAX1847 Inverting DC-DC Converters - MAX1846, MAX1847
  		• Application Note 3843: ±15V Switch-Mode Power Supply Has Wide Input-Voltage Range - MAX1846
  		• Application Note 3943: ±15V or ±12V Output Switch-Mode Power Supply Has Wide Input-Voltage Range - MAX1846

    Evaluation Kits
  		• MAX1846EVKIT, MAX1847EVKIT

    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

    MAX1846 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1846EUB    
    		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
    MAX1846EUB-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
    MAX1846EUB+  
    		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
    MAX1846EUB+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
    MAX1847 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1847EEE    
    		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
    MAX1847EEE-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX1847EEE+  
    		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
    MAX1847EEE+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

    More Information
  		• New Product Press Release 2001-09-18 
  		• MAX1846, MAX1847Power Supply Cookbook

    Related Products

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    Document Ref.: 19-2091; Rev 1; 2005-11-29
    This page last modified: 2008-02-13


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