L9965P

Data brief

Automotive single channel pyro-fuse driver

Features

• AEC-Q100 grade 1 qualified

VFQFN32+4L TQFP32L
5x5x0.9 mm 7x7x1 mm • Full ISO26262 compliant, ASIL-D systems ready
• Very low power consumption:
– Less than 10 μA in deep-sleep mode (only trigger detection enabled)
– Less than 4 mA in low-power mode (trigger detection enabled, ER boost
recharge active, cyclic diagnostics every 100 ms)
• Boost regulator to charge Energy Reserve (ER) with bang-bang control to
Product status link
reduce consumption
L9965P • FENH/FENL digital input triggers, compatible to level or PWM signals (16 kHz
and 125 kHz), with line integrity check feature
• Autonomous cyclic diagnostic routine to ensure detection of all failures which
Product summary
may prevent safe deployment and/or cause inadvertent deployment
Order code Package Packing • Programmable deployment profile: current value and time duration can be
L9965P‑FN Tray adapted to different pyro-fuse igniters
VFQFN32 • Firing strategy supporting multiple retry attempts based on user-selectable
Tape and
L9965P‑FN‑TR FIRE_GOOD signal
reel
• Embedded NVM for configuration parameters storage and runtime
L9965P‑FP Tray configuration integrity check
TQFP32L Tape and
L9965P‑FP‑TR • Easy integration with L9965C companion CSA, implementing many of the
reel safety mechanisms needed to achieve ASIL targets, thus allowing easy
L9965P plug and play in the system
• Pyro-fuse deployment available down to a minimum operating battery voltage
Product labels
of 6 V
• 24-bit peripheral SPI for direct MCU/L9965C interface
• Compatible with pyro-fuses certified according LV-16 and USCAR-28

Application

• High voltage battery packs for BEVs and PHEVs

• Backup energy storage systems and UPS

Description
L9965P is an automotive-grade single channel pyro-fuse driver capable to break high
voltage battery line quickly and reliably in case of short circuit or car crash.
To accomplish this function, the device features a dual FET output stage made of a
HS and a LS powerMOS. The stage is equipped with a closed loop current feedback
and can be configured to deliver controlled firing profiles programming both current
value and time duration.
Moreover, the power stage is able to perform a defined number of auto-retry attempts
based on the success or not of the deployment.
The device embeds a programmable firing logic allowing to generate the trigger
signal from two SPI commands or from two digital inputs (FENH/FENL).

DB5418 - Rev 1 - November 2024 www.st.com

For further information contact your local STMicroelectronics sales office.
 L9965P

The digital input triggers are compatible with both level and PWM encoding, supporting 16 kHz and 125 kHz
encoded signals.
The device supports the charging of an external capacitor to be used as tank capacitor or as energy reserve (ER)
in case of battery loss. An internal boost regulator can be used to control the ER cap voltage around a
programmable setpoint. Boosting the input battery voltage allows using smaller ER capacitor values to store the
energy needed for firing, even in case of ECU battery loss.
The device has been designed to deliver maximum safety and performance while still being energy efficient. A
low-power operation strategy allows minimizing the idle consumption, keeping the device in an ultra low power
state while still performing all the diagnostic sweeps needed for achieving the ASIL targets. The periodicity of the
diagnostic sweeps can be programmed in order to comply with any FTTI. During such ultra low power state, the
device is still sensitive to wake-up/trigger sources in order to be ready to fire.
Operation in conjunction with L9965C companion chip allows simplifying the software development, as many
safety mechanisms are already implemented by L9965C.

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 L9965P
Package information

1 Package information

To meet environmental requirements, ST offers these devices in different grades of ECOPACK packages,
depending on their level of environmental compliance. ECOPACK specifications, grade definitions, and product
status are available at: www.st.com. ECOPACK is an ST trademark.

1.1 VFQFN32 (5x5x0.9 mm 32+4L WETT. FLANKS) package information

Figure 1. VFQFN32 (5x5x0.9 mm 32+4L WETT. FLANKS) package outline

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 L9965P
Package information

Table 1. VFQFN32 (5x5x0.9 mm 32+4L WETT. FLANKS) package mechanical data

Dimensions in mm
Symbol
Min. Typ. Max.

A 0.80 0.90 1.00

A1 0.00 0.02 0.05
A2 0.2 REF
A3 0.10 - -
b 0.20 0.25 0.30
D - 5.00 -
D2 3.55 3.60 3.65
e - 0.5 -
E - 5.00 -
E2 3.55 3.60 3.65
L 0.35 0.45 0.55
L1 - 0.35 -
L2 - 0.075 -
L3 - 0.42 -
k 0.20 - -
N 32+4
Tolerance of form and position
aaa 0.10
bbb 0.10
ccc 0.08
ddd 0.05
eee 0.08
fff 0.10

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 L9965P
Package information

1.2 TQFP32L (7x7x1 mm 32+4L exposed pad down) package information

Figure 2. TQFP32L (7x7x1 mm 32+4L exposed pad down) package outline

θ2
θ1

θ3

DB5418 - Rev 1 page 5/9

 L9965P
Package information

Table 2. TQFP32L (7x7x1 mm 32+4L exposed pad down) package mechanical data

Dimensions in mm
Symbol
Min. Typ. Max.

Ө 0° 3.5° 7°
Ө1 0° - -
Ө2 10° 12° 14°
Ө3 10° 12° 14°
A - - 1.20
A1 0.05 - 0.15
A2 0.95 1.00 1.05
b 0.30 0.37 0.45
b1 0.30 0.35 0.40
c 0.09 - 0.20
c1 0.09 - 0.16
D 9.00 BSC
D1 7.00 BSC
D2 - - 5.37
D3 3.40 - -
e 0.80 BSC
E 9.00 BSC
E1 7.00 BSC
E2 - - 5.37
E3 3.40 - -
L 0.45 0.60 0.75
L1 1.00 REF
N 32+4
R1 0.08 - -
R2 0.08 - 0.20
S 0.20 - -
Tolerance of form and position
aaa 0.20
bbb 0.20
ccc 0.10
ddd 0.20

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 L9965P

Revision history
Table 3. Document revision history

Date Version Changes

06-Nov-2024 1 Initial release.

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 L9965P
Contents

Contents
1 Package information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 VFQFN32 (5x5x0.9 mm 32+4L WETT. FLANKS) package information . . . . . . . . . . . . . . . . . . 3
1.2 TQFP32L (7x7x1 mm 32+4L exposed pad down) package information . . . . . . . . . . . . . . . . . 5
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

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 L9965P

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