LM22673MR-ADJ/NOPB National Semiconductor, LM22673MR-ADJ/NOPB Datasheet - Page 3

• Manufacturer Part Number: LM22673MR-ADJ/NOPB
• Description: IC REG SWITCH BUCK 3A ADJ 8PSOP
• Manufacturer: National Semiconductor
• Series: SIMPLE SWITCHER®r
• Type: Step-Down (Buck)r

Specifications of LM22673MR-ADJ/NOPB

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: Adj to 1.285V
• Current - Output: 3A
• Frequency - Switching: 500kHz
• Voltage - Input: 4.5 ~ 42 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-PSOP
• Package: 8PSOP EP
• Minimum Input Voltage: 4.5 V
• Maximum Input Voltage: 42 V
• Switching Frequency: 500(Typ) KHz
• Operating Supply Voltage: 4.5 to 42 V
• Maximum Output Current: 3 A
• Output Type: Adjustable
• Output Voltage: 1.285(Min) V
• Efficiency: 90(Min) %
• For Use With: 551600236-001 - WEBENCH BUILD IT LM2267X 8-PSOPLM22673EVAL - BOARD EVALUATION FOR LM22673
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -
• Other names: LM22673MR-ADJ

Pin Numbers
Pin Descriptions
Package
PSOP-8
1
2
3
4
5
6
7
8
Pin Numbers
TO-263 THIN
Package
3
5
6
7
4
2
1
-
BOOT
Name
IADJ
GND
VIN
SW
NC
SS
FB
Description
Bootstrap input
Not Connected
Current limit setting pin
Feedback pin
Soft-Start pin
System ground
Source input voltage
Switch pin
3
Application Information
Provides the gate voltage for the high side NFET.
Pin is not electrically connected inside the chip. Pin
does function as thermal conductor.
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.
Inverting input to the internal voltage error amplifier.
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.
Provide good capacitive decoupling between VIN and
this pin.
Input to the regulator. Operates from 4.5V to 42V.
Attaches to the switch node.
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