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Maxim > Products > [Power and Battery Management] 
MAX887, MAX887H
100% Duty Cycle, Low-Noise, Step-Down, PWM DC-DC Converter

Internal Power MOSFET and Current-Sense Reduces Component Count and Saves Space


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Status
Active: In Production.

Data Sheet
FULL DATA SHEET (PDF, 160kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail

Description
The MAX887 high-efficiency, step-down DC-DC converter provides an adjustable output from 1.25V to 10.5V. It accepts inputs from 3.5V to 11V and delivers 600mA. Operation to 100% duty cycle minimizes dropout voltage (300mV typ at 500mA). Synchronous rectification reduces output rectifier losses, resulting in efficiency as high as 95%.

Fixed-frequency pulse-width modulation (PWM) reduces noise in sensitive communications applications. Using a high-frequency internal oscillator allows tiny surface-mount components to reduce PC board area, and eliminates audio-frequency interference. A SYNC input allows synchronization to an external clock to avoid interference with sensitive RF and data-acquisition circuits.

The MAX887 features current-mode operation for superior load/line-transient response. Cycle-by-cycle current limiting protects the internal MOSFET and rectifier. A low-current (2.5µA typ) shutdown mode conserves battery life.

An evaluation kit is available:  MAX887EVKIT  

Key Features   Applications/Uses
  • 95% Efficiency
  • 600mA Output Current
  • Cycle-by-Cycle Current Limiting
  • Low-Dropout, 100% Duty-Cycle Operation, 300mV at 500mA
  • Internal 0.6Ω (typ) MOSFET
  • Internal Synchronous Rectifier
  • High-Frequency Current-Mode PWM
  • External SYNC or Internal 300kHz Oscillator
  • Guaranteed 260kHz to 340kHz Internal Oscillator Frequency Limits
  • 2.5µA Shutdown Mode

 
  		• Cell Phones
  		• Computer Peripherals
  		• Distributed Power Systems
  		• Personal Communicators
  		• Portable Instrumentation

    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
    MAX887  3.5 11 1.25 10 0.6 0.6 Resistor 1 440
    SOIC(N)/8
    		 31 $2.44 @1k
    See All Step-Down Switching Regulators (264)

    Diagram
    MAX887, MAX887H: Typical Operating Circuit
    Typical Operating Circuit

    Evaluation Kits
  		• MAX887EVKIT

    Design Guides
  		• Amplifiers and Sensors (PDF)
  		• Video (PDF)

    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: 1-4 of 4

    MAX887H Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX887HESA    
    		Active SOIC(N);8 pin;31 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
    MAX887HESA-T    
    		Active SOIC(N);8 pin;31 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
    MAX887HESA+  
    		Active SOIC(N);8 pin;31 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
    MAX887HESA+T    
    		Active SOIC(N);8 pin;31 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

    Notes and Comments
    • 2.5 µA shutdown mode, internal synchronous rectifier, 600mA output current

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    •  QuickView   Technical Documents   Ordering Info   More Information  
     Description 
     Key Features 
     Applications/Uses 
     Key Specifications 
     Diagram 

    		 Data Sheet 
     Application Notes 
     Design Guides 
     Engineering Journals 
     Reliability Reports 
     Software/Models 
     Evaluation Kits 

    		 Price and Availability 
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    Document Ref.: 19-1142; Rev 0; 1996-09-01
    This page last modified: 2007-05-31


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