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Maxim > Products > [Power and Battery Management] 
MAX1777, MAX1977, MAX1999
High-Efficiency, Quad Output, Main Power-Supply Controllers for Notebook Computers


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Status
Active: In Production.

Data Sheet
FULL DATA SHEET (PDF, 512kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail

Description
The MAX1777/MAX1977/MAX1999 dual step-down, switch-mode power-supply (SMPS) controllers generate logic-supply voltages in battery-powered systems. The MAX1777/MAX1977/MAX1999 include two pulse-width modulation (PWM) controllers, adjustable from 2V to 5.5V or fixed at 5V and 3.3V. These devices feature two linear regulators providing 5V and 3.3V always-on outputs. Each linear regulator provides up to 100mA output current with automatic linear regulator bootstrapping to the main SMPS outputs. The MAX1777/MAX1977/MAX1999 include on-board power-up sequencing, a power-good (PGOOD) output, digital soft-start, and internal soft-stop output discharge that prevents negative voltages on shutdown.

Maxim's proprietary Quick-PWM™ quick-response, constant on-time PWM control scheme operates without sense resistors and provides 100ns response to load transients while maintaining a relatively constant switching frequency. The unique ultrasonic pulse-skipping mode maintains the switching frequency above 25kHz, which eliminates noise in audio applications. Other features include pulse skipping, which maximizes efficiency in light-load applications, and fixed-frequency PWM mode, which reduces RF interference in sensitive applications.

The MAX1777 features a 200kHz/5V and 300kHz/3.3V SMPS for highest efficiency, while the MAX1977 features a 400kHz/5V and 500kHz/3.3V SMPS for “thin and light” applications. The MAX1999 provides a pin-selectable switching frequency, allowing either 200kHz/300kHz or 400kHz/500kHz operation of the 5V/3.3V SMPSs, respectively. The MAX1777/MAX1977/MAX1999 are available in 28-pin QSOP packages and operate over the extended temperature range (-40°C to +85°C). The MAX1777/ MAX1977/MAX1999 are available in lead-free packages.

An evaluation kit is available:  MAX1999EVKIT  

Key Features   Applications/Uses
  		• No Current-Sense Resistor Needed (MAX1999)
  		• Accurate Current Sense with Current-Sense Resistor (MAX1777/MAX1977)
  		• 1.5% Output Voltage Accuracy
  		• 3.3V and 5V 100mA Bootstrapped Linear Regulators
  		• Internal Soft-Start and Soft-Stop Output Discharge
  		• Quick-PWM with 100ns Load Step Response
  		• 3.3V and 5V Fixed or Adjustable Outputs (Dual Mode™)
  		• 4.5V to 24V Input Voltage Range
  		• Ultrasonic Pulse-Skipping Mode (25kHz min)
  		• Power-Good (PGOOD) Signal
  		• Overvoltage Protection Enable/Disable

    		  
  		• 3- and 4-Cell Li+ Battery-Powered Devices
  		• Notebook and Subnotebook Computers
  		• PDAs and Mobile Communication Devices

    Key Specifications:  Step-Down Switching Regulators
    Part Number VIN
    (V)    		 VIN
    (V)    		 VOUT
    (V)    		 VOUT
    (V)    		 Preset 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
    MAX1777  6 24 2 5.5
    3.3
    5
    		 10 10
    Preset
    Resistor
    		 2 300
    QSOP/28
    		 62 $4.80 @1k
    MAX1977  500
    QSOP/28
    		 $4.80 @1k
    MAX1999  500
    QSOP/28
    		 $4.80 @1k
    See All Step-Down Switching Regulators (264)

    Diagram
    MAX1777, MAX1977, MAX1999: Functional Diagram
    Functional Diagram

    Evaluation Kits
  		• MAX1999EVKIT

    Design Guides
  		• Low-Power Notebook ICs (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: 1-12 of 12

    MAX1777 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1777EEI    
    		Active QSOP;28 pin;62 mm²
    Outline Drawing: 21-0055 (PDF)
    Land Pattern: 90-0173 (PDF)
    Use pkgcode/variation: E28-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1777EEI-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX1777EEI+  
    		Active QSOP;28 pin;62 mm²
    Outline Drawing: 21-0055 (PDF)
    Land Pattern: 90-0173 (PDF)
    Use pkgcode/variation: E28+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1777EEI+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX1977 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1977EEI    
    		Active QSOP;28 pin;62 mm²
    Outline Drawing: 21-0055 (PDF)
    Land Pattern: 90-0173 (PDF)
    Use pkgcode/variation: E28-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1977EEI-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX1977EEI+  
    		Active QSOP;28 pin;62 mm²
    Outline Drawing: 21-0055 (PDF)
    Land Pattern: 90-0173 (PDF)
    Use pkgcode/variation: E28+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1977EEI+T    
    		Active QSOP;28 pin;62 mm²
    Outline Drawing: 21-0055 (PDF)
    Land Pattern: 90-0173 (PDF)
    Use pkgcode/variation: E28+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1999 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1999EEI    
    		Active QSOP;28 pin;62 mm²
    Outline Drawing: 21-0055 (PDF)
    Land Pattern: 90-0173 (PDF)
    Use pkgcode/variation: E28-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1999EEI-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX1999EEI+  
    		Active QSOP;28 pin;62 mm²
    Outline Drawing: 21-0055 (PDF)
    Land Pattern: 90-0173 (PDF)
    Use pkgcode/variation: E28+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1999EEI+T    
    		Active QSOP;28 pin;62 mm²
    Outline Drawing: 21-0055 (PDF)
    Land Pattern: 90-0173 (PDF)
    Use pkgcode/variation: E28+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis

    More Information
  		• New Product Press Release 2002-06-03 

    Related Products
    MAX1901, MAX1902, MAX1904 500kHz Multi-Output, Low-Noise Power-Supply Controllers for Notebook Computers
    MAX1630, MAX1631, MAX1632, MAX1633, MAX1634, MAX1635 Multi Output, Low-Noise Power Supply Controllers for Notebook Computers

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    Document Ref.: 19-2187; Rev 1; 2004-10-07
    This page last modified: 2009-10-14


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