L9680 datasheet(24/286 Pages) STMICROELECTRONICS

24 / 286 page

Overview and block diagram

L9680

24/286

DS11615 Rev 7

5.1

Power supply



Integrated 1.882 MHz boost regulator, 33 V ± 5% or 23 V ± 5% nominal output



Integrated 1.882 MHz boost regulator,12 V/14.75 V nominal output, user selectable via

SPI command



Integrated 1.882 MHz synchronous buck regulator, 7.2 V/9 V ± 4% nominal output,

user selectable via SPI command



Integrated 1.882 MHz synchronous buck regulator, 5 V ± 3% or 3.3 V ± 3% nominal

output, user selectable via VCCSEL pin



Over and under voltage detection and shutdown for all regulators



Under-voltage lockout to guarantee buck regulator outputs disabled and discharged



Integrated energy reserve capacitor fixed constant current source (65 mA, nominal)

switch for controlled inrush and charge characteristics



Integrated energy reserve diagnostics, capacitor value and ESR



Integrated energy reserve crossover switch with current limit and battery input voltage

monitoring



Crossover switch ‘active’ output signal



Integrated 25 V/20 V SPI selectable linear regulator for high-side safing FET gate

supply enabled via SPI or arming logic



Reset output

5.2

Deployment drivers



12 high-side deployment drivers, 12 low-side deployment drivers



User programmable deployment options

–

1.20 A or 1.75 A minimum

–

programmable time in 0.1ms increments



Capability to deploy a squib/pyroswitch with a minimum current of 1.2 / 1.75 A and the

SFx shorted to ground up to 25 V on SSxy



Independently-controlled high-side and low-side FETs



Squib/pyroswitch resistance measurement



Firing current monitor feature



High and low-side FET tests



Open & shorts diagnostics, including between loop drivers



Independent fire enable logic, SPI and discrete digital input

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