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MAX6820

更新时间： 2024-11-18 22:55:15
品牌 Logo 应用领域
美信 - MAXIM /
页数 文件大小 规格书
8页 205K
描述
SOT23 Power-Supply Sequencers

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MAX6820 数据手册

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19-1951; Rev 2; 4/02  
SOT23 Power-Supply Sequencers  
General Description  
Features  
The MAX6819/MAX6820 are power-supply sequencers  
for dual-voltage microprocessors (µPs) and multivolt-  
age systems. These devices monitor a primary supply  
voltage and enable/disable an external N-channel  
MOSFET switch for a secondary supply voltage. The  
MAX6819/MAX6820 control local component voltage  
sequencing when system power-on/power-off charac-  
teristics cannot be guaranteed (supplies come from a  
multivoltage system bus, silver box, or must be  
sequenced in different modes for components on the  
same board). These small power-supply sequencers  
improve system reliability.  
o Adjustable Primary Supply Voltage Monitor  
(Monitors Down to 0.62V)  
o Internal Charge Pump to Enhance External  
Secondary Supply N-Channel MOSFET Switch  
o Delay from Primary Supply Good to Secondary  
Supply Enabled  
Factory Fixed 200ms (MAX6819)  
Capacitor Adjustable (MAX6820)  
o Logic Driven ENABLE Input (MAX6819)  
o Immune to Short Voltage Transients  
o Few External Components  
The MAX6819/MAX6820 include an internal voltage ref-  
erence/comparator with externally adjustable thresh-  
olds to monitor the primary power supply. When the  
primary supply is below the desired threshold, an exter-  
nal secondary supply MOSFET switch is disabled.  
When the primary supply exceeds the threshold, an  
internal charge pump is activated and the external  
MOSFET switch is enabled to connect the secondary  
supply to the load. The charge pump fully enhances the  
o -40°C to +125°C Operating Temperature Range  
o Small 6-Pin SOT23 Package  
Ordering Information  
TOP  
MARK  
PIN-  
PACKAGE  
PART  
TEMP RANGE  
MAX6819UT-T  
MAX6820UT-T  
-40°C to +125°C  
-40°C to +125°C  
6 SOT23-6  
6 SOT23-6  
AARF  
AARG  
N-channel MOSFET switch to provide a very low R  
ON  
DS-  
voltage drop. The devices can be connected to  
support various supply sequencing priorities such as  
before V or V before V  
Products must be ordered in 2,500 piece increments.  
V
I/O  
.
I/O  
CORE  
CORE  
The MAX6819 features a logic-driven EN input to  
enable/disable the external MOSFET drive and includes  
an internally fixed 200ms enable timeout period  
Typical Operating Circuits  
PRIMARY SUPPLY  
(3.3V)  
(V  
to V  
). The  
SECONDARY ENABLE  
PRIMARY GOOD  
MAX6820 allows the enable timeout period to be  
adjusted with a single external capacitor. Both devices  
are specified over the automotive temperature range  
(-40°C to +125°C) and are available in space-saving  
6-pin SOT23 packages.  
SECONDARY SUPPLY  
(1.8V)  
V
V
GATE  
CC2  
DUAL-SUPPLY  
BOARD OR µP  
MAX6819  
GND  
EN  
CC1  
Applications  
Dual-Voltage Microprocessors  
Multivoltage Systems  
ON  
SETV  
OFF  
Digital Signal Processors  
Power PC™ Series Processors  
Pin Configurations  
TOP VIEW  
Pin Configurations and Typical Operating Circuits  
continued at end of data sheet.  
V
1
2
3
6
5
4
V
CC2  
CC1  
MAX6819  
GND  
GATE  
EN  
Power PC is a trademark of IBM corp.  
SETV  
SOT23-6  
________________________________________________________________ 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.  
12345678

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