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MAX1836, MAX1837
24V Internal Switch, 100% Duty Cycle, Step-Down Converters


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Status
Active: In Production.

Data Sheet
FULL DATA SHEET (PDF, 436kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail


Description
  Create a design and simulate with EE-Sim: [MAX1836] [MAX1837]

The MAX1836/MAX1837 high-efficiency step-down converters provide a preset 3.3V or 5V output voltage from supply voltages as high as 24V. Using external feedback resistors, the output voltage may be adjusted from 1.25V to VIN. An internal current-limited switching MOSFET delivers load currents up to 125mA (MAX1836) or 250mA (MAX1837).

The unique current-limited control scheme, operating with duty cycles up to 100%, minimizes the dropout voltage (120mV at 100mA). Additionally, this control scheme reduces supply current under light loads to 12µA. High switching frequencies allow the use of tiny surface-mount inductors and output capacitors.

The MAX1836/MAX1837 step-down converters with internal switching MOSFETs are available in 6-pin SOT23 and 3mm x 3mm TDFN packages, making them ideal for low-cost, low-power, space-sensitive applications. For increased output drive capability, use the MAX1776 step-down converter that uses an internal 24V switch to deliver up to 500mA. For even higher currents, use the MAX1626/MAX1627 step-down controllers that drive an external P-channel MOSFET to deliver up to 20W.

An evaluation kit is available:  MAX1837EVKIT  

Key Features   Applications/Uses
  • 4.5V to 24V Input Voltage Range
  • Preset 3.3V or 5V Output
  • Adjustable Output from 1.25V to VIN
  • Output Currents Up to 125mA (MAX1836) or 250mA (MAX1837)
  • Efficiency Over 90%
  • 12µA Quiescent Current
  • 3µA Shutdown Current
  • 100% Maximum Duty Cycle for Low Dropout
  • Small 6-Pin SOT23 and TDFN Packages
 

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)
Design Tools Package/Pins Smallest Available Pckg.
(mm2)
Price
min max min max max w/pins See Notes
MAX1836  4.5 24 1.25 24
3.3
5
0.125 0.125
Preset
Resistor
1 200 EE-Sim
SOT/6
TDFN-EP/6
9 $2.07 @1k
MAX1837  0.25 0.25
SOT/6
TDFN-EP/6
$2.07 @1k
See All Step-Down Switching Regulators (264)

Diagram
MAX1836, MAX1837: Typical Operating Circuit
Typical Operating Circuit

Application Notes
  • Application Note 960: Portable Supply Derives +5V and +3.3V Power from USB Port - MAX1837
  • Evaluation Kits
  • MAX1837EVKIT
  • Reliability Reports
  • Reliability Report: MAX1837.pdf
  • 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: 1-24 of 24

    MAX1836 Free
    Sample
    Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1836EUT50#TG16    
    Active SOT;6 pin;9 mm²
    Outline Drawing: 21-0058 (PDF)
    Land Pattern: 90-0175 (PDF)
    Use pkgcode/variation: U6FH-6*
    -40°C to +85°C RoHS/Lead-Free: RoHS Qualified
    Materials Analysis
    MAX1836EUT33#TG16    
    Active SOT;6 pin;9 mm²
    Outline Drawing: 21-0058 (PDF)
    Land Pattern: 90-0175 (PDF)
    Use pkgcode/variation: U6FH-6*
    -40°C to +85°C RoHS/Lead-Free: RoHS Qualified
    Materials Analysis
    MAX1836EUT50#G16    
    Active SOT;6 pin;9 mm²
    Outline Drawing: 21-0058 (PDF)
    Land Pattern: 90-0175 (PDF)
    Use pkgcode/variation: U6FH-6*
    -40°C to +85°C RoHS/Lead-Free: RoHS Qualified
    Materials Analysis
    MAX1836EUT33#G16    
    Active SOT;6 pin;9 mm²
    Outline Drawing: 21-0058 (PDF)
    Land Pattern: 90-0175 (PDF)
    Use pkgcode/variation: U6FH-6*
    -40°C to +85°C RoHS/Lead-Free: RoHS Qualified
    Materials Analysis
    MAX1836EUT50#TG40    
    Active SOT;6 pin;9 mm²
    Outline Drawing: 21-0058 (PDF)
    Land Pattern: 90-0175 (PDF)
    Use pkgcode/variation: U6F-6*
    -40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1836EUT50  
    Active SOT;6 pin;9 mm²
    Outline Drawing: 21-0058 (PDF)
    Land Pattern: 90-0175 (PDF)
    Use pkgcode/variation: U6F-6*
    -40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1836EUT33-T    
    Active SOT;6 pin;9 mm²
    Outline Drawing: 21-0058 (PDF)
    Land Pattern: 90-0175 (PDF)
    Use pkgcode/variation: U6F-6*
    -40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1836EUT50-T    
    Active SOT;6 pin;9 mm²
    Outline Drawing: 21-0058 (PDF)
    Land Pattern: 90-0175 (PDF)
    Use pkgcode/variation: U6F-6*
    -40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1836ETT50+  
    Active TDFN-EP;6 pin;9.6 mm²
    Outline Drawing: 21-0137 (PDF)
    Land Pattern: 90-0058 (PDF)
    Use pkgcode/variation: T633+2*
    -40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1836ETT50+T    
    Active TDFN-EP;6 pin;9.6 mm²
    Outline Drawing: 21-0137 (PDF)
    Land Pattern: 90-0058 (PDF)
    Use pkgcode/variation: T633+2*
    -40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1836ETT33+    
    Active TDFN-EP;6 pin;9.6 mm²
    Outline Drawing: 21-0137 (PDF)
    Land Pattern: 90-0058 (PDF)
    Use pkgcode/variation: T633+2*
    -40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1836ETT33+T    
    Active TDFN-EP;6 pin;9.6 mm²
    Outline Drawing: 21-0137 (PDF)
    Land Pattern: 90-0058 (PDF)
    Use pkgcode/variation: T633+2*
    -40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1837 Free
    Sample
    Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1837EUT33#G16    
    Active SOT;6 pin;9 mm²
    Outline Drawing: 21-0058 (PDF)
    Land Pattern: 90-0175 (PDF)
    Use pkgcode/variation: U6FH-6*
    -40°C to +85°C RoHS/Lead-Free: RoHS Qualified
    Materials Analysis
    MAX1837EUT33#TG16    
    Active SOT;6 pin;9 mm²
    Outline Drawing: 21-0058 (PDF)
    Land Pattern: 90-0175 (PDF)
    Use pkgcode/variation: U6FH-6*
    -40°C to +85°C RoHS/Lead-Free: RoHS Qualified
    Materials Analysis
    MAX1837EUT50#G16    
    Active SOT;6 pin;9 mm²
    Outline Drawing: 21-0058 (PDF)
    Land Pattern: 90-0175 (PDF)
    Use pkgcode/variation: U6FH-6*
    -40°C to +85°C RoHS/Lead-Free: RoHS Qualified
    Materials Analysis
    MAX1837EUT50#TG16    
    Active SOT;6 pin;9 mm²
    Outline Drawing: 21-0058 (PDF)
    Land Pattern: 90-0175 (PDF)
    Use pkgcode/variation: U6FH-6*
    -40°C to +85°C RoHS/Lead-Free: RoHS Qualified
    Materials Analysis
    MAX1837EUT33  
    Active SOT;6 pin;9 mm²
    Outline Drawing: 21-0058 (PDF)
    Land Pattern: 90-0175 (PDF)
    Use pkgcode/variation: U6F-6*
    -40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1837EUT50  
    Active SOT;6 pin;9 mm²
    Outline Drawing: 21-0058 (PDF)
    Land Pattern: 90-0175 (PDF)
    Use pkgcode/variation: U6F-6*
    -40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1837EUT33-T    
    Active SOT;6 pin;9 mm²
    Outline Drawing: 21-0058 (PDF)
    Land Pattern: 90-0175 (PDF)
    Use pkgcode/variation: U6F-6*
    -40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1837EUT50-T    
    Active SOT;6 pin;9 mm²
    Outline Drawing: 21-0058 (PDF)
    Land Pattern: 90-0175 (PDF)
    Use pkgcode/variation: U6F-6*
    -40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1837ETT50+  
    Active TDFN-EP;6 pin;9.6 mm²
    Outline Drawing: 21-0137 (PDF)
    Land Pattern: 90-0058 (PDF)
    Use pkgcode/variation: T633+2*
    -40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1837ETT33+  
    Active TDFN-EP;6 pin;9.6 mm²
    Outline Drawing: 21-0137 (PDF)
    Land Pattern: 90-0058 (PDF)
    Use pkgcode/variation: T633+2*
    -40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1837ETT33+T    
    Active TDFN-EP;6 pin;9.6 mm²
    Outline Drawing: 21-0137 (PDF)
    Land Pattern: 90-0058 (PDF)
    Use pkgcode/variation: T633+2*
    -40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1837ETT50+T    
    Active TDFN-EP;6 pin;9.6 mm²
    Outline Drawing: 21-0137 (PDF)
    Land Pattern: 90-0058 (PDF)
    Use pkgcode/variation: T633+2*
    -40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis

    More Information
  • Topmark Coding: MAX1836 MAX1837
  • New Product Press Release 2001-02-19 

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     Description 
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     Key Specifications 
     Diagram 

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    Document Ref.: 19-1919; Rev 3; 2006-08-10
    This page last modified: 2009-03-25


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