L9396 datasheet(35/109 Pages) STMICROELECTRONICS

35 / 109 page

DS12539 Rev 6

35/109

L9396

Power supply

108

3.11

Power up and power down sequences

Wake-up signal turns on the device and initiates the regulator power up sequence as in the

figure below.

Figure 6. Power up sequence from wake up input

The device provides three different possibilities to stay in ON state:



a persistent high signal on IGN pin,



the setting of the POWERHOLD bit through SPI,



the refreshing of the KEEPALIVE bit through SPI within a specified time frame.

At each transition H->L on the wake-up pin the device enters the keep-alive mode for one

keep-alive period (KA_period).

Shutdown delay

time

-90

110

µs

Ileak

Off state leakage

current

VB_SW off

-1

µA

Table 15. Protected battery switch electrical characteristics (continued)

Symbol

Parameter

Conditions

Min

Typ

Max

Units

VBATP

IGN

VPREREG

VCORE

VPREREG _UV

RESET

OFF

Ton

RESET

VCC

GADG1901171330PS

VCC5_UV

VCORE_UV

VCC_UV

VCC_dly

VCC5_dly

WAKE_FLT_up

St-by

VCC 5

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