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MAX8513, MAX8514
Wide-Input, High-Frequency, Triple-Output Supplies with Voltage Monitor and Power-On Reset

Complete Triple-Output xDSL Power Supplies for Modems, Routers, and Gateways Save Cost and Reduce Noise


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Status
Active: In Production.

Data Sheet
FULL DATA SHEET (PDF, 1MB)
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Description
The MAX8513/MAX8514 integrate a voltage-mode PWM step-down DC-DC controller and two LDO controllers, a voltage monitor, and a power-on reset for the lowest-cost power-supply and monitoring solution for xDSL modems, routers, gateways, and set-top boxes.

The DC-DC controller switching frequency can be set with an external resistor from 300kHz to 1.4MHz, to allow for the optimization of cost, size, and efficiency. For noisesensitive applications, the DC-DC controller can also be synchronized to an external clock, minimizing noise interference. Operation above 1.1MHz reduces noise for high data-rate xDSL applications. An adjustable soft-start and adjustable foldback current limit provide reliable startup and fault protection. The DC-DC controller output voltage can be set externally to a voltage from 1.25V to 5.5V. Current limiting is accomplished by inductor current sensing for improved efficiency, or by an external sense resistor for better accuracy.

The MAX8513/MAX8514s' first LDO controller is designed to provide a low-cost, high-current regulated output from 0.8V to 5.5V using an N-channel MOSFET or a low-current output using a low-cost NPN transistor. The MAX8513's second regulator can be used to generate 0.8V to 27V output with a low-cost PNP transistor. Both LDO regulators can operate either from the DC-DC controller output or from a higher voltage derived with a flyback overwinding on the DC-DC converter inductor. The MAX8514's second LDO regulator is designed to provide a negative output with an NPN transistor.

A sequence input allows the outputs to either power up together, or for the DC-DC regulator to power up first and each LDO controller to power up in sequence. An input power-fail output (PFO-bar) is provided for input power-fail warning, such as in dying-gasp applications. A power-on reset circuit with a 140ms delay is also included to indicate when all outputs have achieved regulation and stabilized.

An evaluation kit is available:  MAX8513EVKIT  

Key Features   Applications/Uses
  • Low-Cost DC-DC Controller with Two LDOs
  • Wide Input Range: 4.5V to 28V
  • 300kHz to 1.4MHz Adjustable Switching Frequency
  • Low Noise for High Data-Rate xDSL Applications
  • Synchronizable to External Clock
  • Adjustable Soft-Start
  • Lossless Adjustable Foldback Current Limit
  • Power-On Reset with 140ms Delay
  • Adjustable Input Power-Fail Warning for Dying Gasp
  • Selectable Output-Voltage Sequencing or Output-Voltage Tracking
 

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
MAX8513  4.5 28 0.8 27 4 4 Resistor 1 1400
QSOP/28
61.9 $1.50 @1k
MAX8514 
QSOP/28
$1.50 @1k
See All Step-Down Switching Regulators (264)

Diagram
MAX8513, MAX8514: Pin Configuration
Pin Configuration

Application Notes
  • Application Note 3654: Current Limiting for the MAX1864 Auxiliary Regulator - MAX8513, MAX8514
  • Application Note 3672: Noise Reduction for the MAX1864 Auxiliary Regulator - MAX8513, MAX8514
  • Evaluation Kits
  • MAX8513EVKIT
  • 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: 1-7 of 7

    MAX8513 Free
    Sample
    Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    Temp RoHS/Lead-Free?
    Materials Analysis
    MAX8513EEI+  
    Active QSOP;28 pin;61.9 mm²
    Outline Drawing: 21-0055 (PDF)
    Land Pattern: 90-0173 (PDF)
    Use pkgcode/variation: E28+1*
    -40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX8513EEI+T    
    Active

    Land Pattern: Not Available

    -40°C to +85°C See data sheet
    MAX8513EEI    
    Active QSOP;28 pin;61.9 mm²
    Outline Drawing: 21-0055 (PDF)
    Land Pattern: 90-0173 (PDF)
    Use pkgcode/variation: E28-1*
    -40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX8513EEI-T    
    Active

    Land Pattern: Not Available

    -40°C to +85°C See data sheet
    MAX8514 Free
    Sample
    Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    Temp RoHS/Lead-Free?
    Materials Analysis
    MAX8514AEI    
    Active QSOP;28 pin;61.9 mm²
    Outline Drawing: 21-0055 (PDF)
    Land Pattern: 90-0173 (PDF)
    Use pkgcode/variation: E28-1*
    -40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX8514EEI    
    Active QSOP;28 pin;61.9 mm²
    Outline Drawing: 21-0055 (PDF)
    Land Pattern: 90-0173 (PDF)
    Use pkgcode/variation: E28-1*
    -40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX8514EEI-T    
    Active

    Land Pattern: Not Available

    -40°C to +85°C See data sheet

    More Information
  • New Product Press Release 2004-04-22 

    Related Products
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    MAX8545, MAX8546, MAX8548 Low-Cost, Wide Input Range, Step-Down Controllers with Foldback Current Limit
    MAX8537, MAX8538, MAX8539 Dual-Synchronous Buck Controllers for Point-of-Load, Tracking, and DDR Memory Power Supplies

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    Document Ref.: 19-3178; Rev 0; 2004-05-15
    This page last modified: 2009-10-12


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