L9396 datasheet(21/109 Pages) STMICROELECTRONICS

21 / 109 page

DS12539 Rev 10

21/109

L9396

Power supply

109

3.3

Internal supply

The internal analog and digital part is supplied by the supply voltage VBST through

integrated voltage regulators. The generated voltage is monitored. In case of under/over-

voltage, the device performs a power on reset (POR).

An undervoltage condition on VBST will lead to an internal reset of the IC. Above this

undervoltage threshold, full functionality is granted.

The device integrates two separated instances of Bandgap voltage regulators; one of these

bandgaps is used as voltage reference for the internal regulators, while the other one is

used for monitoring the voltage levels.

GNDD ground line is protected against ground loss scenarios. In case GNDD line would be

at least GNDDOPEN above the reference ground line GNDA, a POR is asserted.

GNDD is used for digital logic and charge pump while GNDA is used for analog blocks.

GNDBST is used for boost regulator only.

VBSTSW

BSTSW Voltage

Clamp

Active when not in

load dump

(VBLOADDUMP)

BST_DISABLETH

Voltage difference

between VB and

VBST to deactivate

the Boost regulator

VB – VBST

1.6

2.6

CLAMP_ENTH

Voltage difference

between BSTSW

and VBST to activate

the Boost CLAMP

BSTSW – VBST

1.5

4.5

fBSTSW

Operating Frequency -

fOSCINT/8.5(1.88)

MHz

tBSTSW

BSTSW Transition

Time

VB = 4.5 V,

IO_BST = 300 mA

TJSDBST

Thermal Shutdown

175

200

°C

THYS_TSDBST

Thermal Shutdown

hysteresis

°C

IBSTSW_LO_OFF

BSTSW current

consumption when

BOOST is OFF

BSTSW - VBST<1.5V

µA

IBSTSW_HI_OFF

BSTSW current

consumption when

BOOST is OFF

BSTSW – VBST>4.5V

µA

VTH_BST_KEEP_OFF

Voltage threshold to

deactivate the Boost

regulator when not

used

0.5

Table 6. Boost regulator electrical characteristics (continued)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

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