4

Functional description

4.1

Functional behavior in detail

In the next paragraphs all device functions, related to device power supply and the pre-drivers, are described in

detail.

4.1.1

VB power supply

VB power supply is the main power input of STPM801. VB battery line starts the power-up and the power-down

sequences by feeding the subsequent internal purpose circuitries (that is, bandgaps, monitoring units and internal

regulators control loops).

VB is compatible to 12 V and 24 V systems. The supply input ranges from 4 V to 65 V. Full functionality and

electrical parameters are guaranteed for VB in the range 4 V to 40 V; from 40 V to 60 V full functionality only.

Reverse input voltage protection is -65 V.

Device can withstand with 1a, 1b, 2a, 2b, 3a, 3b test pulse of ISO-7637 standards, provided that an appropriate

TVS protection is connected on the input battery line.

Once all internal supplies can release POR for the logic section, first of all the trimming parameters are

downloaded from OTP memory; after that all the necessary internal checks are performed (analog comparators,

clock monitor, safety off path self tests).

If at least one of these internal integrity checks is failing, pre-drivers are disabled and FLT output is asserted low,

If the results of previous checks are fine and no faults are detected, when charge pump is out of undervoltage,

the drivers are finally switched on, and FLT output goes high. When device power-up and drivers turn on are

completed, ENOUT pin is also released.

Whenever a fault is detected, the drivers are switched off, and FLT pin is asserted low. Fault and clearing

methods are reported in Table 18.

Table 8. Power supply parameters

Symbol

Parameter

Test condition

Min. Typ. Max. Unit

Pin

VB, range1

Wide range AMR

Full function

4(1)

14

65

V

-

VB, range2

Operating range

Full parameters

4(1)

-

40

V

-

VB, min

Mininum VB to turn on device

-

6

-

-

V

-

ION

Supply current at T = 25 °C

VB = 14 V, device

enable VOUT = VSENSE

= VSOURCE, HGATE ON,

DGATE regulation

If VB is not present, or lower

than OUT, current is sunk

from OUT.

-

14

mA

-

ION_hot

Supply current at T = 150 °C

VB = 14 V, device

enable VOUT = VSENSE

= VSOURCE, HGATE ON,

DGATE regulation

If VB is not present, or lower

than OUT, current is sunk

from OUT.

-

-

16

mA

-

Isd_hot

Supply current in shutdown at

VB = 14 V, T = 150 °C

VB = 14 V, device disabled

-

-

50

μA

VB

Isd

Supply current in shutdown at

VB = 14 V, T = 25 °C

VB = 14 V, device disabled

-

-

25

μA

VB

STPM801

Functional description

DS13990 - Rev 2

page 10/38