A7987 datasheet(14/36 Pages) STMICROELECTRONICS

No de pièce	A7987

Description	61 V, 3 A asynchronous step-down switching regulator with adjustable current limitation for automotive

PDF	36 Pages

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Fabricant	STMICROELECTRONICS [STMicroelectronics]

Site Internet	http://www.st.com

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IPK is the default A7987 current limit in case of RILIM is not mounted, as shown in Table 5. Electrical

characteristics

Figure 9. Current limit and programming resistor

.500

1.00

1.500

2.00

2.500

3.00

3.500

4.00

4.500

100

RILIM [kΩ]

The minimum programmed current limit cannot be lower than ISKIP=0.5 A (typical), also in case of fold-back

detection.

5.6

Overtemperature protection

It is recommended that the device should never exceed the maximum allowable junction temperature. This

temperature increase is mainly caused by the total power dissipated from the integrated power MOSFET.

To avoid any damage to the device when a high temperature is reached, the A7987 implements a thermal

shutdown feature: when the junction temperature reaches 170 °C (typ.) the device turns off the power MOSFET

and shuts down. When the junction temperature drops to 155 °C (typ.), the device restarts with a new soft-start

sequence.

A7987

Overtemperature protection

DS12928 - Rev 3

page 14/36

A7987 Fiches technique(PDF) 14 Page - STMicroelectronics