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National Semiconductor Electronic Components Datasheet

LM22679 Datasheet

Step-Down Voltage Regulator

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LM22679 pdf
October 17, 2008
LM22679
5A SIMPLE SWITCHER®, Step-Down Voltage Regulator
www.dawtasihteeht4u.Acomdjustable Soft-Start and Current Limit
General Description
The LM22679 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 5A
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 LM22679 series also
has built in thermal shutdown and current limiting. The current
limit threshold can be adjusted using an external resistor. An
adjustable soft-start feature is provided by selecting an ap-
propriate external soft-start capacitor.
Features
Wide input voltage range: 4.5V to 42V
Internally compensated voltage mode control
Stable with low ESR ceramic capacitors
100 mN-channel MOSFET
Output voltage options:
-ADJ (outputs as low as 1.285V)
-5.0 (output fixed to 5V)
±1.5% feedback reference accuracy
Switching frequency of 500kHz
-40°C to 125°C operating junction temperature range
Adjustable soft-start
Adjustable current limit
Integrated boot diode
Fully WEBENCH® enabled
Step-down and inverting buck-boost applications
Package
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 300723
30072301
www.national.com


National Semiconductor Electronic Components Datasheet

LM22679 Datasheet

Step-Down Voltage Regulator

No Preview Available !

LM22679 pdf
Connection Diagram
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30072302
7-Lead Plastic TO-263 THIN Package
NS Package Number TJ7A
Ordering Information
Output Voltage
ADJ
ADJ
5.0
5.0
Order Number
LM22679TJE-ADJ
LM22679TJ-ADJ
LM22679TJE-5.0
LM22679TJ-5.0
Package Type
TO-263 THIN Exposed Pad
NSC Package Drawing
TJ7A
Supplied As
250 Units in Tape and Reel
1000 Units in Tape and Reel
250 Units in Tape and Reel
1000 Units in Tape and Reel
Pin Descriptions
Pin Name
Description
Application Information
1 SW
Switch pin
Attaches to the switch node
2 VIN Source input voltage Input to the regulator. Operates from 4.5V to 42V
3 BOOT
Bootstrap input
Provides the gate voltage for the high side NFET
4 GND
System ground
Provide good capacitive decoupling between VIN and this pin
5 IADJ Current Limit Setting pin A resistor attached between this pin and GND can be used to set the current limit threshold.
Pin can be left floating and internal setting will be default.
6 FB
Feedback pin
Inverting input to the internal voltage error amplifier.
7 SS
Soft-start pin
An external capacitor and an internal 50 µA current source set the time constant for the rise
of the error amplifier reference. Pin can be left floating and internal soft-start will be default.
www.national.com
2


Part Number LM22679
Description Step-Down Voltage Regulator
Maker National Semiconductor Corporation
Total Page 14 Pages
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