Datasheet

Exposed Pad
Connect to GND
RT/SYNC
3
FB
4
BOOT
1
SS
2
8
SW
7
VIN
6
GND
5
EN
LM22671-ADJ
VIN
EN
SW
BOOT
FB
GND
VIN
VOUT
RT/SYNC
SS
LM22671
SNVS589M –SEPTEMBER 2008–REVISED APRIL 2013 www.ti.com
Simplified Application Schematic
Connection Diagram
Figure 1. 8-Lead Plastic SO PowerPAD Package
Package Number DDA0008B
PIN DESCRIPTIONS
Pin Name Description Application Information
1 BOOT Bootstrap input Provides the gate voltage for the high side NFET.
2 SS Soft-start pin Used to increase soft-start time. See Soft-Start section of data sheet.
3 RT/SYNC Oscillator frequency adjust pin or Used to control oscillator mode of regulator. See Switching Frequency
frequency synchronization Adjustment and Synchronization section of data sheet.
4 FB Feedback pin Feedback input to regulator.
5 EN Precision enable pin Used to control regulator start-up and shut-down. See Precision Enable and
UVLO section of data sheet.
6 GND System ground System ground pin.
7 VIN Source input voltage Supply input to the regulator.
8 SW Switch pin Switching output of regulator.
EP EP Exposed Pad Connect to ground. Provides thermal connection to PCB. See Application
Information.
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
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Product Folder Links: LM22671