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Maxim > Products > [Power and Battery Management] 
MAX1630A, MAX1631A, MAX1632A, MAX1633A, MAX1634A, MAX1635A
Multi-Output, Low-Noise Power-Supply Controllers for Notebook Computers


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Status
Active: In Production.

Data Sheet
FULL DATA SHEET (PDF, 288kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail

Description
The MAX1630A–MAX1635A are buck-topology, stepdown, switch-mode, power-supply controllers that generate logic-supply voltages in battery-powered systems. These high-performance, dual-/triple-output devices include on-board power-up sequencing, power-good signaling with delay, digital soft-start, secondary winding control, low-dropout circuitry, internal frequency-compensation networks, and automatic bootstrapping.

Up to 96% efficiency is achieved through synchronous rectification and Maxim's proprietary Idle Mode™ control scheme. Efficiency is greater than 80% over a 1000:1 load-current range, which extends battery life in system-suspend or standby mode. Excellent dynamic response corrects output load transients caused by the latest dynamic-clock CPUs within five 300kHz clock cycles. Strong 1A on-board gate drivers ensure fast external n-channel MOSFET switching.

These devices feature a logic-controlled and synchronizable, fixed-frequency, pulse-width-modulation (PWM) operating mode. This reduces noise and RF interference in sensitive mobile communications and pen-entry applications. Asserting the SKIP-bar pin enables fixed-frequency mode for lowest noise under all load conditions.

The MAX1630A–MAX1635A include two PWM regulators, adjustable from 2.5V to 5.5V with fixed 5.0V and 3.3V modes. All these devices include secondary feedback regulation, and the MAX1630A/MAX1632A/MAX1633A/ MAX1635A each contain 12V/120mA linear regulators. The MAX1631A/MAX1634A include a secondary feedback input (SECFB), plus a control pin (STEER) that selects which PWM (3.3V or 5V) receives the secondary feedback signal. SECFB provides a method for adjusting the secondary winding voltage regulation point with an external resistor-divider, and is intended to aid in creating auxiliary voltages other than fixed 12V.

The MAX1630A/MAX1631A/MAX1632A contain internal output overvoltage and undervoltage protection features. The MAX1630A family has improved RF immunity over the MAX1630 family.

Key Features   Applications/Uses
  		• 96% Efficiency
  		• +4.2V to +30V Input Range
  		• 2.5V to 5.5V Dual Adjustable Outputs
  		• Selectable 3.3V and 5V Fixed or Adjustable Outputs (Dual Mode™)
  		• 12V Linear Regulator
  		• Adjustable Secondary Feedback (MAX1631A/MAX1634A)
  		• 5V/50mA Linear Regulator Output
  		• Precision 2.5V Reference Output
  		• Programmable Power-Up Sequencing
  		• Power-Good (RESET-bar) Output
  		• Output Overvoltage Protection (MAX1630A/MAX1631A/MAX1632A)
  		• Output Undervoltage Shutdown (MAX1630A/MAX1631A/MAX1632A)
  		• 200kHz/300kHz Low-Noise, Fixed-Frequency Operation
  		• Low-Dropout, 99% Duty-Factor Operation
  		• 2.5mW Typical Quiescent Power (+12V Input, Both SMPSs On)
  		• 4µA Typical Shutdown Current
  		• 28-Pin SSOP Package

    		  
  		• Desktop CPU Local DC-DC Converters
  		• Notebook and Subnotebook Computers
  		• PDAs and Mobile Communicators

    Diagram
    MAX1630A, MAX1631A, MAX1632A, MAX1633A, MAX1634A, MAX1635A: Functional Diagram
    Functional Diagram

    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: 1-14 of 14

    MAX1631A Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1631AEAI    
    		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
    MAX1631AEAI-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX1631AEAI+  
    		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
    MAX1631AEAI+T    
    		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
    MAX1632A Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1632AEAI    
    		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
    MAX1632AEAI-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX1632AEAI+  
    		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
    MAX1632AEAI+T    
    		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
    MAX1633A Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1633AEAI    
    		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
    MAX1633AEAI-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX1634A Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1634AEAI    
    		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
    MAX1634AEAI-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX1634AEAI+  
    		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
    MAX1634AEAI+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet

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    Document Ref.: 19-3518; Rev 1; 2005-09-16
    This page last modified: 2009-09-22


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