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Maxim > Products > [Power and Battery Management] 
MAX1705, MAX1706
1 to 3 Cell, High Current, Low-Noise, Step-Up DC-DC Converters with Linear Regulator

Low-Noise, Dual-Output Converter Powers PA and Radio Baseband and Logic In Cellular Phones


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Status
Active: In Production.

Data Sheet
FULL DATA SHEET (PDF, 268kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail

Description
The MAX1705/MAX1706 are high-efficiency, low-noise, step-up DC-DC converters with an auxiliary linear-regulator output. These devices are intended for use in battery-powered wireless applications. They use a synchronous rectifier pulse-width-modulation (PWM) boost topology to generate 2.5V to 5.5V outputs from battery inputs, such as 1 to 3 NiCd/NiMH cells or 1 Li-Ion cell. The MAX1705 has an internal 1A n-channel MOSFET switch. The MAX1706 has a 0.5A switch. Both devices also have a built-in low-dropout linear regulator that delivers up to 200mA.

With an internal synchronous rectifier, the MAX1705/MAX1706 deliver 5% better efficiency than similar non-synchronous converters. They also feature a pulse-frequency-modulation (PFM) standby mode to improve efficiency at light loads, and a 1µA shutdown mode. An efficiency-enhancing track mode reduces the step-up DC-DC converter output to 300mV above the linear-regulator output.

Both devices come in a 16-pin QSOP package, which occupies the same space as an 8-pin SO. Other features include two shutdown-control inputs for push-on/push-off control, and an uncommitted comparator for use as a voltage monitor.

An evaluation kit is available:  MAX1705EVKIT, MAX1706EVKIT  

Key Features   Applications/Uses
  • Up to 96% Efficiency
  • 1.1VIN Guaranteed Startup
  • Up to 850mA Output (MAX1705)
  • Step-Up Output (2.5V to 5.5V Adjustable)
  • Linear Regulator (1.25V to 5.0V Adjustable)
  • PWM/PFM Synchronous-Rectified Topology
  • 300kHz PWM Mode or Synchronizable
  • 1µA Shutdown Mode
  • Voltage Monitor
  • Pushbutton On/Off Control

 
  		• Digital Cordless Phones
  		• Handheld Instruments (PDAs, Palmtops)
  		• Palmtop Computers
  		• PCS Phones
  		• Personal Communicators
  		• Two-Way Paging
  		• Wireless Handsets

    Key Specifications:  Step-Up 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
    MAX1705  0.7 5.5 2.5 5.5 0.8 0.8 Resistor 1 400
    QSOP/16
    		 31 $3.09 @1k
    MAX1706  0.4 0.4
    QSOP/16
    		 $2.95 @1k
    See All Step-Up Switching Regulators (91)

    Key Specifications:  Step-Up/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 Alternate Topology Oper. Freq.
    (kHz)    		 Package/Pins Smallest Available Pckg.
    (mm2)    		 Price
    min max min max ≥ ≤ max w/pins See Notes
    MAX1705  0.7 5.5 2.5 5.5 0.8 0.8 Resistor 1
    Step-Up
    Step-Up/Down
    		 400
    QSOP/16
    		 31 $3.09 @1k
    MAX1706  0.4 0.4
    QSOP/16
    		 $2.95 @1k
    See All Step-Up/Down Switching Regulators (9)

    Diagram
    Typical Operating Circuit

    Application Notes
  		• Application Note 256: Two AA Cells Power Step-Down Regulator and 3.3V Boost - MAX1706
  		• Application Note 268: Wireless-Modem Power for Hand-Held Devices - MAX1705
  		• Application Note 269: Trading Performance for Cost in Portable Power Supplies - MAX1705
  		• Application Note 716: Proper Layout and Component Selection Controls EMI - MAX1706
  		• Application Note 947: Dual Power Supply for Wallcube/Battery-Powered Systems - MAX1705

    Evaluation Kits
  		• MAX1705EVKIT, MAX1706EVKIT

    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

    MAX1705 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1705EEE    
    		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
    MAX1705EEE-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: No
    Materials Analysis
    MAX1705EEE+  
    		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
    MAX1705EEE+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
    MAX1706 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1706EEE+  
    		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
    MAX1706EEE+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
    MAX1706EEE    
    		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
    MAX1706EEE-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet

    Notes and Comments
    • High-Efficiency, Synchronous-Rectifier, Low-Battery-Detector, Integrated 200mA Linear Regulator

    Related Products
    MAX1703 1-Cell to 3-Cell, High Power (1.5A), Low-Noise, Step-Up DC-DC Converter
    MAX1700, MAX1701 1 Cell to 3 Cell, High-Power 1A, Low-Noise, Step-Up DC-DC Converters

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    Document Ref.: 19-1198; Rev 1; 2006-05-11
    This page last modified: 2007-06-01


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