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National Semiconductor Electronic Components Datasheet

LM22674 Datasheet

Step-Down Voltage Regulator

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LM22674 pdf
October 17, 2008
LM22674
500 mA SIMPLE SWITCHER®, Step-Down Voltage
Regulatorwww.datasheet4u.com with Precision Enable
General Description
The LM22674 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 500
mA loads with excellent line and load regulation characteris-
tics. 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 LM22674 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
200 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 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)
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 300769
30076901
www.national.com


National Semiconductor Electronic Components Datasheet

LM22674 Datasheet

Step-Down Voltage Regulator

No Preview Available !

LM22674 pdf
Connection Diagram
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Ordering Information
Output Voltage
ADJ
ADJ
ADJ
5.0
5.0
5.0
Order Number
LM22674MR-ADJ
LM22674MRE-ADJ
LM22674MRX-ADJ
LM22674MR-5.0
LM22674MRE-5.0
LM22674MRX-5.0
30076940
8-Lead Plastic PSOP-8 Package
NS Package Number MRA08B
Package Type
PSOP-8 Exposed Pad
NSC Package Drawing
MRA08B
Supplied As
95 Units in Rails
250 Units in Tape and Reel
2500 Units in Tape and Reel
95 Units in Rails
250 Units in Tape and Reel
2500 Units in Tape and Reel
Pin Descriptions
Pins
1
2, 3
Name
BOOT
NC
4 FB
5 EN
6 GND
7 VIN
8 SW
Description
Bootstrap input
Not Connected
Feedback pin
Precision enable pin
System ground
Source input voltage
Switch pin
Application Information
Provides the gate voltage for the high side NFET.
Pins are not electrically connected inside the chip. Pins do function
as thermal conductor.
Inverting input to the internal voltage error amplifier.
When pulled low regulator turns off.
Provide good capacitive decoupling between VIN and this pin
Input to the regulator. Operates from 4.5V to 42V.
Attaches to the switch node
www.national.com
2


Part Number LM22674
Description Step-Down Voltage Regulator
Maker National Semiconductor Corporation
Total Page 14 Pages
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