L9678P datasheet(188/215 Pages) STMICROELECTRONICS

188 / 215 page

Electrical characteristics

L9678P, L9678P-S

188/216

DS11626 Rev 9

16.15

VSF regulator

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

-40 °C  Ta  +95 °C, VINGOOD1(max)  VIN  35 V, VSF + 2V  ERBOOST

Table 45. VSF regulator DC specifications

N°

Symbol

Parameter

Condition

Min. Typ. Max. Unit

VSF

Output voltage

All line, load, IO_VSF up to 6 mA

SYS_CFG(VSF_V)= 0

All line, load, IO_VSF up to 6 mA

BST33V = 1, SYS_CFG(VSF_V)= 1

ILIM_VSF

Output load current limit

Test conditions: VSF = 0

VDO_VSF

Drop-out voltage

V(ERBOOST-VSF)

CVSF

Output capacitance

Design Info.

2.9

ILKG_VSF_OFF VSF input leakage

Device OFF

-5

µA

RPD_VSF

VSF pull-down resistance

Device ON

VSF regulator OFF or ON

1.5V<VSF<25V

Test condition: VSF = 25V

125

188

kΩ

IPD_VSF

VSF pull-down current

Device ON

VSF regulator ON

Design Info

µA

IPD_VSF_TOT

VSF total pull-down

current

IPD_VSF_TOT = IPD_VSF +

RPD_VSF

Device ON

VSF regulator ON

Test conditions:

– VSF = 25V

– SYS_CGF(VSF_V)= 0

166

230

462

µA

Table 46. VSF regulator AC specifications

N°

Symbol

Parameter

Condition

Min. Typ. Max.

Unit

TON,VSF VSF turn on time

CVSF = 14 nF and IO_VSF=0

Measured from VSF_EN = 1 to

VSF inside regulation limits

100

µs

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