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National Semiconductor Electronic Components Datasheet

LM22677 Datasheet

Step-Down Voltage Regulator

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LM22677 pdf
October 17, 2008
LM22677
5A SIMPLE SWITCHER®, Step-Down Voltage Regulator
www.dawtasihteeht4u.Scomynchronization or Adjustable Switching Frequency
General Description
The LM22677 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 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 LM22677 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.
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 500 kHz, adjustable between 200
kHz and 1 MHz
-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
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 300741
30074101
www.national.com


National Semiconductor Electronic Components Datasheet

LM22677 Datasheet

Step-Down Voltage Regulator

No Preview Available !

LM22677 pdf
Connection Diagram
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30074102
7-Lead Plastic TO-263 THIN Package
NS Package Number TJ7A
Ordering Information
Output Voltage
ADJ
ADJ
5.0
5.0
Order Number
LM22677TJE-ADJ
LM22677TJ-ADJ
LM22677TJE-5.0
LM22677TJ-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 RT/SYNC Oscillator frequency adjust A resistor connected from this pin to GND adjusts the oscillator frequency. This
pin or frequency
pin can also accept an input for synchronization from an external clock. Pin can
synchronization
be left floating and internal setting will be default to 500 kHz.
6 FB
Feedback pin
Inverting input to the internal voltage error amplifier.
7 EN Precision enable pin When pulled low regulator turns off.
www.national.com
2


Part Number LM22677
Description Step-Down Voltage Regulator
Maker National Semiconductor Corporation
Total Page 16 Pages
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