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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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Data Sheet
FULL DATA SHEET (PDF, 512kB)
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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.

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 (min) (V) VIN (max) (V) Min. VOUT (V) Max. VOUT (V) Preset VOUT (V) IOUT (A) IOUT (A) Output Adj. Method Number of DC-DC Outputs Operating Freq. (kHz) Package Price**
    MAX1777  6 24 2 5.5 3.3 10 10 Preset
    Resistor     		2 300 QSOP/28 $4.80 @ 1k
    MAX1977  500 $4.80 @ 1k
    MAX1999  500 $4.80 @ 1k
    See All Step-Down Switching Regulators (222)
    Notes:
    **This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

    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
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1777EEI  
    		QSOP;28 pin;
    Dwg: 21-0055 (PDF)
    Use pkgcode/variation: E28-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1777EEI+T  
    		QSOP;28 pin;
    Dwg: 21-0055 (PDF)
    Use pkgcode/variation: E28+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1777EEI+  
    		QSOP;28 pin;
    Dwg: 21-0055 (PDF)
    Use pkgcode/variation: E28+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1777EEI-T  
    		QSOP;28 pin;
    Dwg: 21-0055 (PDF)
    Use pkgcode/variation: E28-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1977 Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1977EEI-T  
    		QSOP;28 pin;
    Dwg: 21-0055 (PDF)
    Use pkgcode/variation: E28-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1977EEI  
    		QSOP;28 pin;
    Dwg: 21-0055 (PDF)
    Use pkgcode/variation: E28-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1977EEI+  
    		QSOP;28 pin;
    Dwg: 21-0055 (PDF)
    Use pkgcode/variation: E28+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1977EEI+T  
    		QSOP;28 pin;
    Dwg: 21-0055 (PDF)
    Use pkgcode/variation: E28+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1999 Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1999EEI  
    		QSOP;28 pin;
    Dwg: 21-0055 (PDF)
    Use pkgcode/variation: E28-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1999EEI-T  
    		QSOP;28 pin;
    Dwg: 21-0055 (PDF)
    Use pkgcode/variation: E28-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1999EEI+  
    		QSOP;28 pin;
    Dwg: 21-0055 (PDF)
    Use pkgcode/variation: E28+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1999EEI+T  
    		QSOP;28 pin;
    Dwg: 21-0055 (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: 2007-07-11




             


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