SPSB100 datasheet(16/213 Pages) STMICROELECTRONICS

16 / 213 page

Figure 10. Battery drop behavior

VFBB

digital por_n

BOOST enable

analog por_n

BUCKs on

BUCKs off

SBSB100

state

IRQ

ACTIVE or REC-1 or

REC-2 or INIT

state

BOOST switching

BYPASS ON

BOOST switching

executes

Power-Up

sequence

REC-1

Trig WD

ACTIVE

13.5V

Safety

checks

REC-2  INIT

State depends

on SW action

No IRQ, but flag is set

FBB_UV_EW

FBB_UV

POR not reaches 

SPSB100 restarts

Always high

VFBB_UV_F # 4.9 or 5.75V

VVS_UV_EW

VPORVS_F # 2.15V

VFBB_UV_EW programmable

from 8.36V to 5V

VFBB_UV_R # 5.25 or 6.25V

VFBB_REG # 8 or 9.5V

VTH_BYPASS_Rn # 9 or 10.5V

VTH_BYPASS_Fn # 8.75 or 10V

VFBB_OK_R # 7.2 or 9V

VS_UV_EW

(1)

(1) Digital comparator in ACTIVE – Full-Power & REC -1, programmable threshold.

IRQ flags :

EW = Early warning

Overvoltage cases are not critical for the boost itself (the bypass is ON) but for the regulators (BUCKs, LDOs…)

that are directly supplied. These are managed according to configured thresholds (through VFBB_OV threshold)

which trigger in any case a power down sequence. Power up is initiated as long as the voltage decreases below

the overvoltage FBB_OV_F.

Undervoltage cases are critical for the regulators (BUCKs, LDOs…) that are directly supplied. These are

managed according to configured thresholds (through VFBB_UV_F threshold) which trigger in any case a power

down sequence. Power-up is initiated as long as the voltage increase above the undervoltage related threshold

VFBB_UV_R.

SPSB100

Functional description

DS14640 - Rev 2

page 16/213

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