lm22676mrx-adj National Semiconductor Corporation, lm22676mrx-adj Datasheet
lm22676mrx-adj
Available stocks
Related parts for lm22676mrx-adj
lm22676mrx-adj Summary of contents
Page 1
... The LM22676 series also has built in thermal shutdown, current limiting and an enable control input that can power down the regulator to a low 25 µA quiescent current standby condition. Simplified Application Schematic © 2008 National Semiconductor Corporation Features ■ Wide input voltage range: 4.5V to 42V ■ ...
Page 2
... Connection Diagrams Ordering Information Output Voltage Order Number ADJ LM22676MR-ADJ ADJ LM22676MRE-ADJ ADJ LM22676MRX-ADJ ADJ LM22676TJE-ADJ ADJ LM22676TJ-ADJ 5.0 LM22676MR-5.0 5.0 LM22676MRE-5.0 5.0 LM22676MRX-5.0 5.0 LM22676TJE-5.0 5.0 LM22676TJ-5.0 www.national.com 30076540 8-Lead Plastic PSOP-8 Package NS Package Number MRA08B 7-Lead Plastic TO-263 THIN Package NS Package Number TJ7A Package Type ...
Page 3
Pin Descriptions Pin Numbers Pin Numbers Name PSOP-8 TO-263 THIN Package Package 1 3 BOOT GND Description Application Information Bootstrap input Provides the gate voltage for the ...
Page 4
Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. VIN to GND EN Pin Voltage SW to GND (Note 2) BOOT Pin Voltage FB Pin Voltage Power Dissipation ...
Page 5
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur, including inoperability and degradation of device reliability and/or performance. Functional operation of the device and/or non-degradation at the Absolute Maximum Ratings or other conditions beyond ...
Page 6
Feedback Bias Current vs Temperature Standby Quiescent Current vs Input Voltage Normalized Feedback Voltage vs Input Voltage www.national.com Normalized Enable Threshold Voltage vs Temperature 30076505 Normalized Feedback Voltage vs Temperature 30076506 30076509 6 30076510 30076507 ...
Page 7
Typical Application Circuit and Block Diagram FIGURE 1. 3. OUT 7 30076514 www.national.com ...
Page 8
Detailed Operating Description The LM22676 switching regulator features all of the functions necessary to implement an efficient high voltage buck regu- lator using a minimum of external components. This easy to use regulator integrates a 42V N-Channel switch with an ...
Page 9
Boot Pin The LM22676 integrates an N-Channel FET switch and as- sociated floating high voltage level shift / gate driver. This gate driver circuit works in conjunction with an internal diode and an external bootstrap capacitor. A 0.01 µF ceramic ...
Page 10
The average current into VIN during switch on-time is the load current. The input capacitance should be selected for RMS current and minimum ripple voltage. A good ap- RMS proximation for the required ripple current rating necessary ...
Page 11
Circuit Board Layout Board layout is critical for switching power supplies. First, the ground plane area must be sufficient for thermal dissipation purposes. Second, appropriate guidelines ...
Page 12
PCB Layout Example for TO-263 THIN Package www.national.com 12 30076525 ...
Page 13
PCB Layout Example for PSOP-8 Package Schematic for Buck/Boost (Inverting) Application See AN-1888 for more information on the inverting (buck- boost) application generating a negative output voltage from a positive input voltage. 30076541 30076526 13 www.national.com ...
Page 14
Physical Dimensions www.national.com inches (millimeters) unless otherwise noted 7-Lead Plastic TO-263 THIN Package NS Package Number TJ7A 8-Lead PSOP Package NS Package Number MRA08B 14 ...
Page 15
Notes 15 www.national.com ...
Page 16
... National Semiconductor and the National Semiconductor logo are registered trademarks of National Semiconductor Corporation. All other brand or product names may be trademarks or registered trademarks of their respective holders. ...