L9680 datasheet(246/286 Pages) STMICROELECTRONICS

246 / 286 page

Electrical characteristics

L9680

246/286

DS11615 Rev 7

17.10

ER switch

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

-40 °C  Ta  +95 °C, VINGOOD0  VIN  35 V.

Table 40. ER CAP current generators and diagnostic AC specifications

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

TON_ERCAP

Energy reserve capacitor

charge-up time

CVER  10mF nominal,

BST33V = 0, Design Info

TESR_DIAG

ER CAP ESR diagnostic

duration

Total duration time from SPI

command to ADC results

availability

-5%

225

+5%

µs

TFLT_TSD_ERCHARGE

Thermal shutdown filter

time

µs

Table 41. ER Switch DC specifications

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

RDSON_ERSW Power switch resistance

Vin = 5.5 V and 35 V

0.5

ILIM_ERSW

ER switch current limit

VER = 17 V @ VIN = 12 V

and

VER = 35 V @ VIN = 31 V

608

810

980

VER_SW_OV_TH

ER switch Over Voltage

threshold

ER switch turned off when

VIN > VER + VER_SW_OV_TH

Vin = 12 V and 35 V

200

TJSD_ERSW

Thermal shutdown

150

175

190

°C

THYS_TSDERSW

°C

Table 42. ER Switch AC specifications

Symbol

Parameter

Conditions

Min

Max

Unit

TON_ERSW

ER turn-on time (time to

reach either RDSON_ERSW or

ILIM_ERSW)

CVIN = 10 µF

µs

TFLT_TSD_ERSW Thermal shutdown filter time -

µs

TBLK_ERSW

ER switch activation

blanking time after thermal

shutdown

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