lm22680mrx-adj National Semiconductor Corporation, lm22680mrx-adj Datasheet - Page 2

• Manufacturer Part Number: lm22680mrx-adj
• Description: 2a Simple Switcher ?step-down Voltage Regulator With Features
• Manufacturer: National Semiconductor Corporation

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Output Voltage
Connection Diagram
Ordering Information
Pin Descriptions
Pin
1
2
3
4
5
6
7
8
ADJ
ADJ
ADJ
RT/SYNC Oscillator frequency adjust pin or
BOOT
Name
GND
VIN
SW
SS
FB
EN
Description
Bootstrap input
Soft-start pin
frequency synchronization
Feedback pin
Precision enable pin
System ground
Source input voltage
Switch pin
LM22680MRE-ADJ
LM22680MRX-ADJ
LM22680MR-ADJ
Order Number
PSOP-8 Exposed Pad
8-Lead Plastic PSOP-8 Package
NS Package Number MRA08B
Package Type
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.
2
NSC Package Drawing
30080740
MRA08B
2500 Units in Tape and Reel
250 Units in Tape and Reel
95 Units in Rails
Supplied As