L9396 datasheet(23/109 Pages) STMICROELECTRONICS

23 / 109 page

DS12539 Rev 6

23/109

L9396

Power supply

108

3.5

Charge pump

A two-stage charge pump is integrated to supply the high voltage circuit in the VPREREG

and VCORE regulators and in the pump motor and fail safe pre-drivers.

The charge pump is supplied by the rail connected to VBST pin. External charging

capacitors are used to achieve a high current capability.

Figure 4. Charge pump block diagram

It features a current limitation protection when either C1 or C2 is being charged up. The

charge pump is protected against over temperature with dedicated thermal sensor. In

standby mode the charge pump is disabled.

In case the CP output voltage remains too low for longer than tfCP the CP LOW bit is

latched, which leads to shutdown of VPREREG, pump motor driver and fail safe driver. In

turn, under voltage of VPREREG leads to shutdown of VCC, VCC5 and VCORE regulators.

Table 8. Wake-up input electrical characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VBstby_cur

Battery standby current

consumption

VBATP = 19 V Wake

disable Sum of leakage

currents from BSTSW,

VBST, VB and VBM

µA

WAKEhigh_th

Wake-up high voltage

threshold

-3.5

WAKElow_th

Wake-up low voltage

threshold

1.5

WAKEhys

Wake-up voltage

hysteresis

0.5

1.5

WAKEpd

Wake-up pull down

IGN = 14 V

300

900

kΩ

WAKEflt_up

Wake up ON deglitch

µs

WAKEflt_down

Wake up OFF deglitch

µs

KA_period

Keep-alive period

200

Charge Pump

CTANK

VBST

VCP

GADG1801171544PS

VC1

VC2

VC3

VC4

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