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MAX1836-MAX1837

更新时间： 2024-10-02 22:20:51
品牌 Logo 应用领域
美信 - MAXIM 转换器开关
页数 文件大小 规格书
13页 394K
描述
24V Internal Switch, 100% Duty Cycle, Step-Down Converters

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MAX1836-MAX1837 数据手册

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19-1919; Rev 1; 01/02  
24V Internal Switch, 100% Duty Cycle,  
Step-Down Converters  
General Description  
____________________________Features  
ꢀ 4.5V to 24V Input Voltage Range  
ꢀ Preset 3.3V or 5V Output  
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  
ꢀ Adjustable Output from 1.25V to V  
IN  
from 1.25V to V . An internal current-limited switching  
IN  
MOSFET delivers load currents up to 125mA  
(MAX1836) or 250mA (MAX1837).  
ꢀ Output 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.  
ꢀ Internal P-Channel MOSFET  
ꢀ Efficiency Over 90%  
ꢀ 12µA Quiescent Current  
ꢀ 3µA Shutdown Current  
ꢀ 100% Maximum Duty Cycle for Low Dropout  
ꢀ Current-Limiting and Overtemperature Protection  
ꢀ Small 6-Pin SOT23 Package  
The MAX1836/MAX1837 step-down converters with  
internal switching MOSFETs are available in a 6-pin  
SOT23 package, making them ideal for low-cost, low-  
power, space-sensitive applications. For increased out-  
put 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.  
Ordering Information  
TOP  
MARK  
PIN-  
PACKAGE  
PART  
TEMP RANGE  
6 SOT23-6  
6 SOT23-6  
6 SOT23-6  
6 SOT23-6  
MAX1836EUT50-T -40°C to +85°C  
MAX1836EUT33-T -40°C to +85°C  
MAX1837EUT50-T -40°C to +85°C  
MAX1837EUT33-T -40°C to +85°C  
AANW  
AANY  
AANX  
AANZ  
________________________Applications  
9V Battery Systems  
Note: The MAX1836/MAX1837 require special solder tempera-  
ture profile described in the Absolute Maximum Ratings.  
Notebook Computers  
Distributed Power Systems  
Backup Supplies  
Selector Guide  
4mA to 20mA Loop Power Supplies  
Industrial Control Supplies  
Hand-Held Devices  
PRESET OUTPUT  
VOLTAGE (V)  
LOAD  
CURRENT (mA)  
PART  
MAX1836EUT50  
MAX1836EUT33  
MAX1837EUT50  
MAX1837EUT33  
5
125  
125  
250  
250  
3.3  
5
Typical Operating Circuit  
3.3  
OUTPUT  
3.3V OR 5V  
INPUT  
4.5V TO 24V  
Pin Configuration  
IN  
LX  
TOP VIEW  
SHDN  
FB  
GND  
IN  
1
2
3
6
5
4
OUT  
SHDN  
LX  
OUT  
MAX1836  
MAX1837  
MAX1836  
MAX1837  
GND  
FB  
NOTE: HIGH-CURRENT PATHS SHOWN WITH BOLD LINES.  
SOT23  
________________________________________________________________ Maxim Integrated Products  
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at  
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.  
1234567...13

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