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Maxim > Products > [Power and Battery Management] 
MAX1551, MAX1555
SOT23, Dual-Input, USB/AC Adapter, 1-Cell Li+ Battery Chargers

First Dual-Input, USB/AC-Adapter, Li+ Chargers in a SOT23 Package Require No External FETs or Diodes


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Status
Active: In Production.

Data Sheet
FULL DATA SHEET (PDF, 212kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail

Description
The MAX1551 and MAX1555 charge a single-cell lithium-ion (Li+) battery from both USB† and AC adapter sources. They operate with no external FETs or diodes, and accept operating input voltages up to 7V.

On-chip thermal limiting simplifies PC board layout and allows optimum charging rate without the thermal limits imposed by worst-case battery and input voltage. When the MAX1551 and MAX1555 thermal limits are reached, the chargers do not shut down, but progressively reduce charging current.

The MAX1551 includes an active-low POK output to indicate when input power is present. If either charging source is active, active-low POK goes low. The MAX1555 instead features a active-low CHG output to indicate charging status.

With USB connected, but without DC power, charge current is set to 100mA (max). This allows charging from both powered and unpowered USB hubs with no port communication required. When DC power is connected, charging current is set at 280mA (typ). No input-blocking diodes are required to prevent battery drain.

The MAX1551 and MAX1555 are available in 5-pin thin SOT23 packages and operate over a -40°C to +85°C range.

Key Features   Applications/Uses
  • Charge from USB or AC Adapter
  • Automatic Switchover when AC Adapter is Plugged In
  • On-Chip Thermal Limiting Simplifies Board Design
  • Charge Status Indicator
  • 5-Pin Thin SOT23 Package
  • Protected by U.S. Patent #6,507,172

 
  		• Cell Phones
  		• Digital Cameras
  		• PDAs
  		• Wireless Appliances

    Key Specifications:  Battery Chargers
    Part Number Cell Chemistry Lithium Ion Cells Protected VIN
    (V)    		 Charging VIN
    (V)    		 Charge Rate Set by Max. ICHG
    (A)    		 Charge Termination Charge Regulation Features EV Kit Package/Pins Smallest Available Pckg.
    (mm2)    		 Oper. Temp.
    (°C)    		 Price
    max max ≥ max w/pins See Notes
    MAX1551 
    Li-Ion
    Li-Polymer
    		 1 7 7 Preset 0.28 External Control Linear
    Dual USB/Adapter Input
    Internal FET/Transistor
    Stand Alone
    Thermal Die Regulation
    USB Input
    		 No
    TSOT/5
    		 8 -40 to +85 $0.85 @1k
    MAX1555 
    TSOT/5
    		 $0.85 @1k
    See All Battery Chargers (62)

    †Protected by U.S. Patent #6,507,172.

    Diagram
    MAX1551, MAX1555: Typical Operating Circuit
    Typical Operating Circuit

    Application Notes
  		• Application Note 3241: Charging Batteries Using USB Power - MAX1555

    Design Guides
  		• Power Management for Battery-Powered Equipment (PDF)

    Reliability Reports
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    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

    MAX1551 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1551EZK+  
    		Active TSOT;5 pin;8 mm²
    Outline Drawing: 21-0113 (PDF)
    Land Pattern: 90-0241 (PDF)
    Use pkgcode/variation: Z5+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1551EZK  
    		Active TSOT;5 pin;8 mm²
    Outline Drawing: 21-0113 (PDF)
    Land Pattern: 90-0241 (PDF)
    Use pkgcode/variation: Z5-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1551EZK-T    
    		Active TSOT;5 pin;8 mm²
    Outline Drawing: 21-0113 (PDF)
    Land Pattern: 90-0241 (PDF)
    Use pkgcode/variation: Z5-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1551EZK+T    
    		Active TSOT;5 pin;8 mm²
    Outline Drawing: 21-0113 (PDF)
    Land Pattern: 90-0241 (PDF)
    Use pkgcode/variation: Z5+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1555 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1555EZK  
    		Active TSOT;5 pin;8 mm²
    Outline Drawing: 21-0113 (PDF)
    Land Pattern: 90-0241 (PDF)
    Use pkgcode/variation: Z5-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1555EZK+  
    		Active TSOT;5 pin;8 mm²
    Outline Drawing: 21-0113 (PDF)
    Land Pattern: 90-0241 (PDF)
    Use pkgcode/variation: Z5+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1555EZK-T    
    		Active TSOT;5 pin;8 mm²
    Outline Drawing: 21-0113 (PDF)
    Land Pattern: 90-0241 (PDF)
    Use pkgcode/variation: Z5-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1555EZK+T    
    		Active TSOT;5 pin;8 mm²
    Outline Drawing: 21-0113 (PDF)
    Land Pattern: 90-0241 (PDF)
    Use pkgcode/variation: Z5+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis

    More Information
  		• Topmark Coding: MAX1551 MAX1555
  		• New Product Press Release 2003-08-15 

    Related Products
    MAX1874 Dual-Input, USB/AC Adapter, 1-Cell Li+ Charger with OVP and Thermal Regulation
    MAX1925, MAX1926 Switch-Mode 1-Cell Li+ Chargers

    More Like This: View Product Families for Similar Products

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    Document Ref.: 19-2902; Rev 0; 2003-07-31
    This page last modified: 2008-03-27


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