L9961 datasheet(34/63 Pages) STMICROELECTRONICS

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Table 25. CHG/DCHG pre-driver electrical parameter

Symbol

Parameter

Test conditions

Min. Typ. Max. Unit

FPRDRV

Pre-driver expected

switching frequency

Application info

DCHG, VSD, VSC,

CHG

CPRDRV_LOAD

Equivalent capacitive load

on CHG/DCGH pins

Application info

DCHG, VSD, VSC,

CHG

VGS_ON1

CHG/DCHG ON voltage

VB > 5.0 V

7.2 10.5 11.7

DCHG, VSD, VSC,

CHG

VGS_ON2

CHG/DCHG ON voltage

4.3V < VB < 5.0 V

6.0

DCHG, VSD, VSC,

CHG

VGS_OFF

CHG/DCHG OFF voltage

I(CHG) = I(DCHG) = 0.450 mA

V(VSx)=0 V

100

DCHG, VSD, VSC,

CHG

IPU

CHG/DCHG current source

V(CHG)-V(VSC)=0 V

V(DCHG)-V(VSD)=0 V

V(VSx)=0 V

-2.4

-0.6

DCHG, VSD, VSC,

CHG

IPD

CHG/DCHG current sink

V(CHG)-V(VSC)=1.4 V

V(DCHG)-V(VSD)=1.4 V

V(VSx)=0 V

12.5 39.2

DCHG, VSD, VSC,

CHG

IPD_PEAK

CHG/DCHG current sink

peak

Design info

18.5

DCHG, VSD, VSC,

CHG

RPD

CHG/DCHG pulldown

resistance

V(CHG)-V(VSC)=0.3 V

V(DCHG)-V(VSD)=0.3 V

V(VSx)=0 V

Ω

DCHG, VSD, VSC,

CHG

3.7.2

FUSE pre-driver

Under certain conditions classified as permanent failures, L9961 can be programmed to activate the FUSE

pre-driver. An external NMOS can be driven to blow up a fuse connected in series to the battery pack positive

terminal.

The following list of failures is classified as permanent:

•

Severe cell UV: aimed at preventing copper deposition (see Section 3.4.1 Cell voltage monitor (Cx))

•

Severe cell OV: aimed at preventing explosion hazard (see Section 3.4.1 Cell voltage monitor (Cx))

•

VB vs. Sum Of Cells plausibility check fail: aimed at preventing BMS permanent malfunction (see

Section 3.4.2 Battery stack monitor (VB))

•

Severe NTC OT: aimed at preventing fire hazard (see Section 3.4.3 Cell temperature monitor (NTC))

•

Persistent charge current: aimed at preventing overcharge (see Section 3.5.3 Overcurrent monitor)

•

Persistent discharge current: aimed at preventing overdischarge (see Section 3.5.3 Overcurrent monitor)

•

Persistent short circuit in discharge: aimed at preventing fire hazard (see Section 3.5.4 Short-circuit in

discharge protection)

In addition to the internal diagnostics, L9961 can also enable the FUSE predriver upon:

•

User request through I2C

FUSE must start from the OFF condition (FUSE_TRIG_FIRE = 01)

FUSE shall be first armed writing FUSE_TRIG_ARM = 10

•

The FUSE can be then fired setting FUSE_TRIG_FIRE = 10 within TFUSE_TIMEOUT, otherwise the fire

command will be discarded

Note:

Rewriting FUSE_TRIG_ARM = 10 while the timeout is running restarts the timer. Writing FUSE_TRIG_FIRE =

01 interrupts the FUSE activation. Writing FUSE_TRIG_ARM = 10 while FUSE_TRIG_FIRE = 10 immediately

fires the FUSE.

•

Secondary protector activation detection: if the FUSE voltage rises above VFUSE_TH for longer than

TFUSE_FILTER, the FUSE pre-driver is enabled and the FUSE_EXT flag is set. Once triggered, the action

can no longer be inhibited unless a GO2SHIP/GO2SLP command is issued.

L9961

HS/LS pre-drivers (CHG/DCHG/FUSE)

DS14012 - Rev 1

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