http://www.www.datasheet4u.com

900,000+ Datasheet PDF Search and Download

Datasheet4U offers most rated semiconductors datasheets pdf




National Semiconductor Electronic Components Datasheet

LM22672 Datasheet

Step-Down Voltage Regulator

No Preview Available !

LM22672 pdf
October 17, 2008
LM22672
1A SIMPLE SWITCHER®, Step-Down Voltage Regulator
www.dawtasihteeht4u.Fcoem atures
General Description
The LM22672 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 1A
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 switching frequency
can also be adjusted with an external resistor or synchronized
to an external clock up to 1MHz. It is also possible to self-
synchronize multiple regulators to share the same switching
frequency. The LM22672 series also has built in thermal shut-
down, current limiting and an enable control input that can
power down the regulator to a low 25 µA quiescent current
standby condition. An adjustable soft-start feature is provided
by selecting an appropriate external soft-start capacitor.
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, adjustable between 200
kHz and 1 MHz
-40°C to 125°C operating junction temperature range
Precision enable pin
Integrated boot diode
Adjustable 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 300767
30076701
www.national.com


National Semiconductor Electronic Components Datasheet

LM22672 Datasheet

Step-Down Voltage Regulator

No Preview Available !

LM22672 pdf
Connection Diagram
www.datasheet4u.com
Ordering Information
Output Voltage
ADJ
ADJ
ADJ
5.0
5.0
5.0
Order Number
LM22672MR-ADJ
LM22672MRE-ADJ
LM22672MRX-ADJ
LM22672MR-5.0
LM22672MRE-5.0
LM22672MRX-5.0
30076740
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
Pin Name Description
1 BOOT Bootstrap input
2 SS Soft-start pin
3 RT/SYNC Oscillator frequency adjust pin or
frequency synchronization
4 FB Feedback pin
5 EN Precision enable pin
6 GND System ground
7 VIN Source input voltage
8 SW Switch pin
Application Information
Provides the gate voltage for the high side NFET.
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.
A resistor connected from this pin to GND adjusts the oscillator frequency.
This pin can also accept an input for synchronization from an external
clock. Pin can be left floating and internal setting will be default to 500 kHz.
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 LM22672
Description Step-Down Voltage Regulator
Maker National Semiconductor Corporation
Total Page 16 Pages
PDF Download
LM22672 pdf
Download PDF File
LM22672 pdf
View for Mobile



Buy Electronic Components




Related Datasheet

1 LM22670 LM22670/-Q1 42-V 3-A SIMPLE SWITCHER Step-Down Voltage Regulator With Features (Rev. P) Texas Instruments
Texas Instruments
LM22670 pdf
2 LM22670 Step-Down Voltage Regulator National Semiconductor Corporation
National Semiconductor Corporation
LM22670 pdf
3 LM22670-Q1 LM22670/-Q1 42-V 3-A SIMPLE SWITCHER Step-Down Voltage Regulator With Features (Rev. P) Texas Instruments
Texas Instruments
LM22670-Q1 pdf
4 LM22671 LM22671/-Q1 42 V 500 mA SIMPLE SWITCHER Step-Down Voltage Regulator with Features (Rev. N) Texas Instruments
Texas Instruments
LM22671 pdf
5 LM22671 Step-Down Voltage Regulator National Semiconductor Corporation
National Semiconductor Corporation
LM22671 pdf
6 LM22671-Q1 LM22671/-Q1 42 V 500 mA SIMPLE SWITCHER Step-Down Voltage Regulator with Features (Rev. N) Texas Instruments
Texas Instruments
LM22671-Q1 pdf
7 LM22672 LM22672/-Q1 42-V 1-A SIMPLE SWITCHER Step-Down Voltage Regulator with Features (Rev. M) Texas Instruments
Texas Instruments
LM22672 pdf
8 LM22672 Step-Down Voltage Regulator National Semiconductor Corporation
National Semiconductor Corporation
LM22672 pdf
9 LM22672-Q1 LM22672/-Q1 42-V 1-A SIMPLE SWITCHER Step-Down Voltage Regulator with Features (Rev. M) Texas Instruments
Texas Instruments
LM22672-Q1 pdf






Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z

site map

webmaste! click here

contact us

Buy Components