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Maxim > Products > [Power and Battery Management] 
MAX881R
Low-Noise Bias Supply in µMAX with Power OK for GaAsFET PA

1mVP-P Output Voltage Ripple


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Status
Active: In Production.

Data Sheet
FULL DATA SHEET (PDF, 344kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail

Description
The MAX881R low-noise, inverting power supply is designed for biasing GaAsFET power amplifiers in portable wireless applications. This device is a chargepump inverter followed by a negative linear regulator. The input voltage range is 2.5V to 5.5V. The output is preset at -2.0V or can be set, using two resistors, to any voltage from -0.5V to (-VIN + 0.6V). It can deliver up to 4mA. The internal linear regulator also filters the output to 1mVP-P ripple and noise.

Other features include a power-OK (active-low POK) output that signals when the negative voltage is within 7.5% of its set point. It protects the GaAsFET by not allowing power to be applied to the GaAsFET's drain until it is properly biased. The signal can be routed either to a microcontroller or directly to a switch at the GaAsFET drain. The MAX881R is available in a 10-pin µMAX® package.

An evaluation kit is available:  MAX881REVKIT  

Key Features   Applications/Uses
  • Small µMAX Package
  • 1mVP-P Output Voltage Ripple and Noise
  • Power-OK Signal to Control GaAsFET Drain Switch
  • 0.05µA Logic-Controlled Shutdown
  • 1ms Guaranteed Startup
  • 2.5V to 5.5V Input
  • -0.5V to (-VIN + 0.6V) Output at up to 4mA
  • Operates with One 4.7µF and Three 0.22µF Capacitors (no inductors needed)

 
  		• Cell Phones Wireless Modems
  		• PCS Phones Two-Way Pagers
  		• PHS Phones Mobile Radios
  		• Wireless Handsets Wireless Computers

    Key Specifications:  Charge Pumps
    Part Number Topology VIN
    (V)    		 VIN
    (V)    		 ICC
    (mA)    		 Unadj. VOUT
    (V)    		 Adj. VOUT
    (V)    		 Adj. VOUT
    (V)    		 IOUT
    (A)    		 Oper. Freq.
    (kHz)    		 Features Package/Pins Smallest Available Pckg.
    (mm2)    		 Oper. Temp.
    (°C)    		 Price
    min max max min max typ max w/pins See Notes
    MAX881R 
    Inverter
    Regulated
    		 2.5 5.5 0.95 -2 -VIN-0.6 -0.5 0.01 100 Shutdown
    µMAX/10
    		 15 -40 to +85 $1.85 @1k
    See All Charge Pumps (48)

    Diagram
    MAX881R: Typical Operating Circuit
    Typical Operating Circuit

    Application Notes
  		• Application Note 1212: Pulsed Sensor Extends Battery Life - MAX881R

    Evaluation Kits
  		• MAX881REVKIT

    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

    MAX881R Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX881REUB    
    		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
    MAX881REUB-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
    MAX881REUB+  
    		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
    MAX881REUB+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

    Notes and Comments
    • Regulated output, low-noise

    Related Products
    MAX850, MAX851, MAX852, MAX853 Low-Noise, Regulated, Negative Charge Pump Power Supplies for GaAsFET Bias

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     Diagram 

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    Document Ref.: 19-1372; Rev 2; 2004-06-02
    This page last modified: 2007-06-11


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