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National Semiconductor Electronic Components Datasheet

LM22676 Datasheet

Step-Down Voltage Regulator

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LM22676 pdf
October 17, 2008
LM22676
3A SIMPLE SWITCHER®, Step-Down Voltage Regulator
www.dawtasihteeht4u.Pcomrecision Enable
General Description
The LM22676 series of regulators are monolithic integrated
circuits which provide all of the active functions for a step-
down (buck) switching regulator capable of driving up to 3A
loads with excellent line and load regulation characteristics.
High efficiency (>90%) is obtained through the use of a low
ON-resistance N-channel MOSFET. The series consists of a
fixed 5V output and an adjustable version.
The SIMPLE SWITCHER® concept provides for an easy to
use complete design using a minimum number of external
components and National’s WEBENCH® design tool.
National’s WEBENCH® tool includes features such as exter-
nal component calculation, electrical simulation, thermal sim-
ulation, and Build-It boards for easy design-in. The switching
clock frequency is provided by an internal fixed frequency os-
cillator which operates at 500 kHz. 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.
Features
Wide input voltage range: 4.5V to 42V
Internally compensated voltage mode control
Stable with low ESR ceramic capacitors
120 mN-channel MOSFET TO-263 THIN package
100 mN-channel MOSFET PSOP-8 package
Output voltage options:
-ADJ (outputs as low as 1.285V)
-5.0 (output fixed to 5V)
±1.5% feedback reference accuracy
Switching frequency of 500 kHz
-40°C to 125°C operating junction temperature range
Precision enable pin
Integrated boot diode
Integrated soft-start
Fully WEBENCH® enabled
Step-down and inverting buck-boost applications
Package
PSOP-8 (Exposed Pad)
TO-263 THIN (Exposed Pad)
Applications
Industrial Control
Telecom and Datacom Systems
Embedded Systems
Automotive Telematics and Body Electronics
Conversions from Standard 24V, 12V and 5V Input Rails
Simplified Application Schematic
© 2008 National Semiconductor Corporation 300765
30076501
www.national.com


National Semiconductor Electronic Components Datasheet

LM22676 Datasheet

Step-Down Voltage Regulator

No Preview Available !

LM22676 pdf
Connection Diagrams
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30076540
8-Lead Plastic PSOP-8 Package
NS Package Number MRA08B
30076502
7-Lead Plastic TO-263 THIN Package
NS Package Number TJ7A
Ordering Information
Output Voltage
ADJ
ADJ
ADJ
ADJ
ADJ
5.0
5.0
5.0
5.0
5.0
Order Number
LM22676MR-ADJ
LM22676MRE-ADJ
LM22676MRX-ADJ
LM22676TJE-ADJ
LM22676TJ-ADJ
LM22676MR-5.0
LM22676MRE-5.0
LM22676MRX-5.0
LM22676TJE-5.0
LM22676TJ-5.0
Package Type
NSC Package Drawing
Supplied As
PSOP-8 Exposed Pad
MRA08B
95 Units in Rails
250 Units in Tape and Reel
2500 Units in Tape and Reel
TO-263 THIN Exposed Pad
TJ7A
250 Units in Tape and Reel
1000 Units in Tape and Reel
PSOP-8 Exposed Pad
MRA08B
95 Units in Rails
250 Units in Tape and Reel
2500 Units in Tape and Reel
TO-263 THIN Exposed Pad
TJ7A
250 Units in Tape and Reel
1000 Units in Tape and Reel
www.national.com
2


Part Number LM22676
Description Step-Down Voltage Regulator
Maker National Semiconductor Corporation
Total Page 16 Pages
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