L9678P datasheet(183/215 Pages) STMICROELECTRONICS

183 / 215 page

DS11626 Rev 9

183/216

L9678P, L9678P-S

Electrical characteristics

214

16.9

ER charge

All electrical characteristics are valid for the following conditions unless otherwise noted.

-40 °C  Ta  +95 °C, VINGOOD1(max)  VIN  35 V, 8 V  ERBOOST.

16.10

ER switch

All electrical characteristics are valid for the following conditions unless otherwise noted.

-40 °C  Ta  +95 °C, VINGOOD1(max)  VIN  35 V.

Table 30. ER current generator DC specifications

N°

Symbol

Parameter

Condition

Min. Typ. Max. Unit

IER_CHARGE

ER charge current

ERBOOST – VER  3 V

-33

-30

-27

2 RDSON_ERCHARGE

ER charge power

resistance

(VERBOOST - VVER) / IVER

IVER = 10mA

Table 31. ER current generator AC specifications

N°

Symbol

Parameter

Condition

Min.

Typ. Max. Unit

TON_ERCAP

Energy reserve capacitor

charge-up time

CVER  4.7mF nominal,

BST33V = 0; Design Info

Table 32. ER switch DC specifications

N°

Symbol

Parameter

Condition

Min. Typ. Max.

Unit

RDSON ERSW Power switch resistance

ILIM,ERSW(min)

0.5

ILIM,ERSW

ER switch current limit

400

600

TJSD_ERSW

Thermal shutdown

150

175

190

°C

THYS_TSDERSW

°C

Table 33. ER switch AC specifications

N°

Symbol

Parameter

Condition

Min. Typ. Max.

Unit

TON_ERSW

ER turn-on time (time to

reach either RDSON_ERSW or

ILIM_ERSW)

CVIN = 10µF

µs

TFLT_TSD_ERSW Thermal shutdown filter time -

µs

TBLK_ERSW

ER switch activation blanking

time after thermal shutdown

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