UC1842A-SP, UC1844A-SP
SLUS872E – JANUARY 2009 – REVISED FEBRUARY 2019
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Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Device Comparison Table..................................... 3
6 Pin Configuration and Functions ......................... 3
7 Specifications......................................................... 4
7.1 Absolute Maximum Ratings ...................................... 4
7.2 ESD Ratings.............................................................. 4
7.3 Recommended Operating Conditions....................... 4
7.4 Thermal Information .................................................. 4
7.5 Electrical Characteristics........................................... 5
7.6 Electrical Characteristics (Radiation-Improved
Devices) ..................................................................... 7
7.7 Typical Characteristics .............................................. 8
8 Detailed Description .............................................. 9
8.1 Overview ................................................................... 9
8.2 Functional Block Diagram ......................................... 9
8.3 Feature Description................................................... 9
8.4 Device Functional Modes........................................ 14
9 Application and Implementation ........................ 15
9.1 Application Information............................................ 15
9.2 Typical Application .................................................. 15
10 Power Supply Recommendations ..................... 23
11 Layout................................................................... 23
11.1 Layout Guidelines ................................................. 23
11.2 Layout Example .................................................... 24
12 Device and Documentation Support ................. 25
12.1 Related Links ........................................................ 25
12.2 Receiving Notification of Documentation Updates 25
12.3 Community Resources.......................................... 25
12.4 Trademarks ........................................................... 25
12.5 Electrostatic Discharge Caution ............................ 25
12.6 Glossary ................................................................ 25
13 Mechanical, Packaging, and Orderable
Information ........................................................... 25
4 Revision History
Changes from Revision D (May 2015) to Revision E
Page
• Removed UC1843A-SP part from this data sheet.................................................................................................................. 1
• Changed the Pin Configuration images.................................................................................................................................. 3
• Changed CT (pF) To: CT (µF) in Equation 1........................................................................................................................ 17
Changes from Revision C (March 2015) to Revision D
Page
• Updated features to remove radiation hardness assurance................................................................................................... 1
• Updated table notes for Electrical Characteristics ................................................................................................................. 5
• Updated table note in Electrical Characteristics (Radiation-Improved Devices) ................................................................... 7
• Corrected minimum discharge current in Electrical Characteristics (Radiation-Improved Devices) ..................................... 7
• Corrected input voltage unit to V and MIN and MAX values ................................................................................................. 7
• Decreased set point variation over temperature from ±10% to ±2% ................................................................................... 13
Changes from Revision B (October 2013) to Revision C
Page
• Added ESD Ratings table, Typical Characteristics, Detailed Description, Application and Implementation, Power
Supply Recommendations, Layout, and Device and Documentation Support sections ........................................................ 1
• Removed UC1845A-SP part from this data sheet.................................................................................................................. 1
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