SMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH
Peak Reflow Temperature (Cel):
260
Qualification Status:
Not Qualified
Seated Height-Max:
1.2 mm
Supply Voltage-Max (Vsup):
5.5 V
Supply Voltage-Min (Vsup):
3 V
Supply Voltage-Nom (Vsup):
5 V
Surface Mount:
YES
Technology:
NMOS
Temperature Grade:
AUTOMOTIVE
Terminal Finish:
Matte Tin (Sn)
Terminal Form:
GULL WING
Terminal Pitch:
0.65 mm
Terminal Position:
DUAL
Time@Peak Reflow Temperature-Max (s):
40
Width:
4.4 mm
A3977KLPTR-T Frequently Asked Questions (FAQs)
Allegro recommends a 2-layer PCB with a solid ground plane on the bottom layer and a thermal relief pattern on the top layer to minimize thermal resistance. A minimum of 2 oz copper thickness is recommended for the PCB.
To ensure reliable operation in high-temperature environments, it's essential to follow proper thermal design and layout guidelines, use a suitable thermal interface material, and consider derating the device's output current according to the temperature derating curve provided in the datasheet.
Allegro recommends using a low-ESR ceramic capacitor with a value of 10 μF to 22 μF, rated for the input voltage, and placed as close to the VIN pin as possible to minimize noise and ensure stable operation.
To troubleshoot output voltage regulation issues, check the input voltage, output load, and feedback resistors for correct values and connections. Verify that the output capacitor is properly sized and placed. Also, ensure that the device is not overheating and that the thermal shutdown is not triggered.
The maximum allowed voltage on the EN pin is 5.5 V, which is the absolute maximum rating. It's recommended to keep the EN pin voltage below 5 V to ensure reliable operation and prevent damage to the device.
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A3977KLPTR-T Overview
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