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Maxim > Products > [Power and Battery Management] 
MAX786, MAX786R, MAX786S
Dual-Output Power Supply Controller for Notebook Computers

Dual-Output 3.3V and 5V Notebook Power Supply Provide Up to 50W with >90% Efficiency


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Status
Active: In Production.

Data Sheet
FULL DATA SHEET (PDF, 320kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail

Description
The MAX786 is a system-engineered power-supply controller for notebook computers or similar battery-powered equipment. It provides two high-performance step-down (buck) pulse-width modulators (PWMs) for +3.3V and +5V. Other features include dual, low-dropout, micropower linear regulators for CMOS/RTC back-up, and two precision low-battery-detection comparators.

High efficiency (95% at 2A; greater than 80% at loads from 5mA to 3A) is achieved through synchronous rectification and PWM operation at heavy loads, and Idle Mode™ operation at light loads. The MAX786 uses physically small components, thanks to high operating frequencies (300kHz/200kHz) and a new current-mode PWM architecture that allows for output filter capacitors as small as 30µF per ampere of load. Line- and load-transient responses are terrific, with a high 60kHz unity-gain crossover frequency allowing output transients to be corrected within four or five clock cycles. Low system cost is achieved through a high level of integration and the use of low-cost, external N-channel MOSFETs.

Other features include low-noise, fixed-frequency PWM operation at moderate to heavy loads, and a synchronizable oscillator for noise-sensitive applications such as electromagnetic pen-based systems and communicating computers. The MAX786 is a monolithic, BiCMOS IC available in fine-pitch, surface-mount SSOP packages.

Key Features   Applications/Uses
  • Dual PWM Buck Controllers (+3.3V and +5V)
  • Two Precision Comparators or Level Translators
  • 95% Efficiency
  • 420µA Quiescent Current, 70µA in Standby (linear regulators alive)
  • 25µA Shutdown Current (+5V linear alive)
  • 5.5V to 30V Input Range
  • Small SSOP Package
  • Fixed Output Voltages:
    • 3.3V (standard)
    • 3.45V (High-Speed Pentium®)
    • 3.6V (PowerPC®)

 

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
MAX786  5.5 30 3.3 5
3.3
5
 5 5
Preset
Resistor
 2 300
SSOP/28
 81.6 $4.15 @1k
See All Step-Down Switching Regulators (264)

Diagram
MAX786, MAX786R, MAX786S: Typical Application Circuit
Typical Application Circuit

Reliability Reports
  		• Show FIT data for:
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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: 1-16 of 16

    MAX786 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX786EVKIT-SO    
    		Active

    Land Pattern: Not Available

    		See data sheet
    MAX786EAI+  
    		Active SSOP;28 pin;81.6 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0095 (PDF)
    Use pkgcode/variation: A28+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX786EAI+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX786CAI    
    		Active SSOP;28 pin;81.6 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0095 (PDF)
    Use pkgcode/variation: A28-1*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX786CAI-T    
    		Active SSOP;28 pin;81.6 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0095 (PDF)
    Use pkgcode/variation: A28-1*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX786CAI+  
    		Active SSOP;28 pin;81.6 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0095 (PDF)
    Use pkgcode/variation: A28+1*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX786CAI+T    
    		Active SSOP;28 pin;81.6 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0095 (PDF)
    Use pkgcode/variation: A28+1*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX786EAI    
    		Active SSOP;28 pin;81.6 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0095 (PDF)
    Use pkgcode/variation: A28-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX786EAI-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX786R Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX786RCAI    
    		Active SSOP;28 pin;81.6 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0095 (PDF)
    Use pkgcode/variation: A28-1*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX786RCAI+    
    		Active SSOP;28 pin;81.6 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0095 (PDF)
    Use pkgcode/variation: A28+1*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX786REAI    
    		Active SSOP;28 pin;81.6 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0095 (PDF)
    Use pkgcode/variation: A28-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX786REAI-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX786S Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX786SCAI    
    		Active SSOP;28 pin;81.6 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0095 (PDF)
    Use pkgcode/variation: A28-1*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX786SCAI+    
    		Active SSOP;28 pin;81.6 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0095 (PDF)
    Use pkgcode/variation: A28+1*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX786SEAI    
    		Active SSOP;28 pin;81.6 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0095 (PDF)
    Use pkgcode/variation: A28-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis

    Notes and Comments
  		• Fixed output voltages available 3.3V, 3.45V, 3.6V

    Related Products
    MAX783, MAX783EVKIT Triple-Output Power Supply Controller for Notebook Computers
    MAX782, MAX782R, MAX782S Triple-Output Power Supply Controller for Notebook Computers

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    Document Ref.: 19-0160; Rev 2; 1999-01-01
    This page last modified: 2009-08-17


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