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Maxim > Products > [Power and Battery Management] 
MAX1964, MAX1965
Tracking/Sequencing Triple/Quintuple Power-Supply Controllers

Lowest Cost, 3- and 5-Output Modem Supplies with Sequencing and Tracking


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Status
Active: In Production.

Data Sheet
FULL DATA SHEET (PDF, 472kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail

Description
The MAX1964/MAX1965 power-supply controllers are designed to address cost-sensitive applications demanding voltage sequencing/tracking, such as cable modem consumer premise equipment (CPE), xDSL CPE, and set-top boxes. Operating off a low-cost, unregulated DC supply (such as a wall adapter output), the MAX1964 generates three positive outputs and the MAX1965 generates four positive outputs and one negative output to provide an inexpensive system power supply.

The MAX1964 includes a current-mode synchronous step-down controller and two positive regulator gain blocks. The MAX1965 has one additional positive gain block and one negative regulator gain block. The main synchronous step-down controller generates a high-current output that is preset to 3.3V or adjustable from 1.236V to 0.75 x VIN with an external resistive-divider. The 200kHz operating frequency allows the use of low-cost aluminum-electrolytic capacitors and low-cost power magnetics. Additionally, the MAX1964/MAX1965 step-down controllers sense the voltage across the low-side MOSFET's on-resistance to efficiently provide the current-limit signal, eliminating the need for costly current-sense resistors.

The MAX1964/MAX1965 generate additional supply rails at low cost. The positive regulator gain blocks use an external PNP pass transistor to generate low voltage rails directly from the main step-down converter (such as 2.5V or 1.8V from the main 3.3V output) or higher voltages using coupled windings from the step-down converter (such as 5V, 12V, or 15V). The MAX1965's negative gain block uses an external NPN pass transistor in conjunction with a coupled winding to generate -5V, -12V, or -15V.

All output voltages are externally adjustable, providing maximum flexibility. During startup, the MAX1964 features voltage sequencing and the MAX1965 features voltage tracking. Both controllers provide a power-good output that monitors all of the output voltages.

Key Features   Applications/Uses
  • 4.5V to 28V Input Voltage Range
  • Master DC-DC Step-Down Converter:
    • Preset 3.3V or Adjustable (1.236V to 0.75 x VIN) Output Voltage
    • Fixed Frequency (200kHz) PWM Controller
    • No Current-Sense Resistor
    • Adjustable Current Limit
    • 95% Efficient
    • Soft-Start
  • Two (MAX1964)/Four (MAX1965) Analog Gain Blocks:
    • Positive Analog Blocks Drive Low-Cost PNP Pass Transistors to Build Positive Linear Regulators
    • Negative Analog Block (MAX1965) Drives a Low-Cost NPN Pass Transistor to Build a Negative Linear Regulator
  • Power-Good Indicator
  • Voltage Sequencing (MAX1964) or Tracking (MAX1965)

 
  		• Set-Top Boxes
  		• Wireless Local Loop (WLL)
  		• xDSL, Cable, and ISDN Modems

    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
    MAX1964  4.5 28 1.23 20 3.3 5 5
    Preset
    Resistor
    		 1 200
    QSOP/16
    		 31 $1.75 @1k
    MAX1965 
    QSOP/20
    		 54 $2.05 @1k
    See All Step-Down Switching Regulators (264)

    Diagram
    MAX1964, MAX1965: Typical Operating Circuit
    Typical Operating Circuit

    Application Notes
  		• Application Note 841: Multiple Output Power Supplies with Output Sequencing - MAX1964, MAX1965
  		• Application Note 3654: Current Limiting for the MAX1864 Auxiliary Regulator - MAX1964, MAX1965
  		• Application Note 3672: Noise Reduction for the MAX1864 Auxiliary Regulator - MAX1964, MAX1965

    Reliability Reports
  		• Reliability Report: MAX1964.pdf
  		• 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: 1-6 of 6

    MAX1964 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1964TEEE+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
    MAX1964TEEE+  
    		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
    MAX1964TEEE  
    		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
    MAX1964TEEE-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX1965 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1965TEEP    
    		Active QSOP;20 pin;54 mm²
    Outline Drawing: 21-0055 (PDF)
    Land Pattern: 90-0168 (PDF)
    Use pkgcode/variation: E20-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1965TEEP-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet

    More Information
  		• New Product Press Release 2001-08-16 
  		• MAX1965Power Supply Cookbook

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    Document Ref.: 19-2084; Rev 0; 2001-07-01
    This page last modified: 2008-03-12


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