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Maxim > Products > [Power and Battery Management] 
MAX1687, MAX1688
Step-Up DC-DC Converters with Precise, Adaptive Current Limit for GSM

Reduces GSM Battery Peak Current by 6x, Eliminates DC-DC Noise during Transmission with User Selectable Disable


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Status
Active: In Production.

Data Sheet
FULL DATA SHEET (PDF, 224kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail

Description
The MAX1687/MAX1688 step-up DC-DC converters deliver up to 2W from a single Li-Ion or three NiMH cells. The devices are ideal for burst-load applications such as GSM cell phones and wireless LANs, where the RF power amplifiers require short, high current bursts. The MAX1687/MAX1688 reduce battery surge current by slowly charging a reservoir capacitor, which supplies the necessary peak energy for the load current burst. As a result, the peak battery current is limited, thus maximizing battery life and minimizing battery voltage sag and transient dips.

An internal synchronous rectifier provides over 90% conversion efficiency and eliminates the need for an external Schottky diode. A logic shutdown mode reduces the shutdown current to only 3µA. The devices can be disabled during current bursts (RF transmit mode) to eliminate switching noise.

The switching frequency of the MAX1687/MAX1688, controlled by the selected inductor, can exceed 1MHz. Two external resistors set the output voltage from 1.25V to 6V. The MAX1687 controls peak battery current, while the MAX1688 features a more advanced, adaptive constant-recharge-time algorithm that maximizes battery life. The MAX1687/MAX1688 are available in thin 16-pin TSSOP (1.1mm max height) or standard 8-pin SO packages.

An evaluation kit is available:  MAX1687EVKIT, MAX1688EVKIT  

Key Features   Applications/Uses
  • Low 450mA Peak Battery Current Provides 2A, 5V GSM Burst
  • 90% Efficiency
  • Internal Power MOSFETs and Current-Sense Resistor
  • Output Disconnects from Input During Shutdown
  • 3µA Shutdown Current
  • Precise Voltage-Controlled Current Limit (MAX1687)
  • Adaptive Constant-Recharge-Time Capability (MAX1688)
  • 1.25V to 6V Adjustable Output
  • 2.7V to 6V Input Range (1 Li-Ion cell or 3 NiMH cells)
  • Switching Frequency Can Exceed 1MHz
  • Standby Mode Disables DC-DC During Transmission Burst
  • Low Inrush Current at Start-Up

 
  		• GSM Phones
  		• PC Cards (PCMCIA)
  		• 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
    MAX1687  2.7 6 1.25 6 2.5 2.5 Resistor 1 500
    SOIC(N)/8
    TSSOP/16
    		 31 $2.20 @1k
    MAX1688 
    SOIC(N)/8
    TSSOP/16
    		 $2.20 @1k
    See All Step-Up Switching Regulators (91)

    Diagram
    MAX1687, MAX1688: Typical Operating Circuit
    Typical Operating Circuit

    Evaluation Kits
  		• MAX1687EVKIT, MAX1688EVKIT

    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: 1-16 of 16

    MAX1687 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1687ESA    
    		Active SOIC(N);8 pin;31 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0096 (PDF)
    Use pkgcode/variation: S8-5*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1687ESA-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX1687ESA+  
    		Active SOIC(N);8 pin;31 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0096 (PDF)
    Use pkgcode/variation: S8+5*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1687ESA+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX1687EUE    
    		Active TSSOP;16 pin;33 mm²
    Outline Drawing: 21-0066 (PDF)
    Land Pattern: 90-0117 (PDF)
    Use pkgcode/variation: U16-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1687EUE-T    
    		Active TSSOP;16 pin;33 mm²
    Outline Drawing: 21-0066 (PDF)
    Land Pattern: 90-0117 (PDF)
    Use pkgcode/variation: U16-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1687EUE+  
    		Active TSSOP;16 pin;33 mm²
    Outline Drawing: 21-0066 (PDF)
    Land Pattern: 90-0117 (PDF)
    Use pkgcode/variation: U16+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1687EUE+T    
    		Active TSSOP;16 pin;33 mm²
    Outline Drawing: 21-0066 (PDF)
    Land Pattern: 90-0117 (PDF)
    Use pkgcode/variation: U16+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1688 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1688ESA    
    		Active SOIC(N);8 pin;31 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0096 (PDF)
    Use pkgcode/variation: S8-5*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1688ESA-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX1688ESA+  
    		Active SOIC(N);8 pin;31 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0096 (PDF)
    Use pkgcode/variation: S8+5*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1688ESA+T    
    		Active SOIC(N);8 pin;31 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0096 (PDF)
    Use pkgcode/variation: S8+5*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1688EUE    
    		Active TSSOP;16 pin;33 mm²
    Outline Drawing: 21-0066 (PDF)
    Land Pattern: 90-0117 (PDF)
    Use pkgcode/variation: U16-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1688EUE-T    
    		Active TSSOP;16 pin;33 mm²
    Outline Drawing: 21-0066 (PDF)
    Land Pattern: 90-0117 (PDF)
    Use pkgcode/variation: U16-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1688EUE+  
    		Active TSSOP;16 pin;33 mm²
    Outline Drawing: 21-0066 (PDF)
    Land Pattern: 90-0117 (PDF)
    Use pkgcode/variation: U16+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1688EUE+T    
    		Active TSSOP;16 pin;33 mm²
    Outline Drawing: 21-0066 (PDF)
    Land Pattern: 90-0117 (PDF)
    Use pkgcode/variation: U16+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis

    Notes and Comments
  		• Burst mode, precise, adaptive current limit for GSM (MAX1687)
  		• Burst mode, precise, adaptive current limit for GSM, with adaptive constant-recharge-time algorithm (MAX1688)

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    Document Ref.: 19-1426; Rev 0; 1999-02-01
    This page last modified: 2009-09-07


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