For further information contact your local STMicroelectronics sales office.

February 2022

DB4679 Rev 1

1/16

L5964

Automotive monolithic dual step-down switching regulator with LDO

Data brief

Features

 AEC-Q100 qualified

 Two step-down synchronous switching voltage

regulators with internal power switches:

– Output voltage selectable by external

divider (feedback voltage at 0.9 V)

– Minimum and maximum output is limited by

minimum and maximum duty cycle

– Internal high-side/ low-side NDMOS

– 270 kHz and 2.2 MHz selectable free-run

frequencies

– 125 kHz < f < 2.3 MHz synchronization

range at SYNCIN pin

– Programmable current limits at 2 A and

3.5A (> 2 A requires the addition of external

schottky diodes)

– Independent hardware enabling pins

– Independent supply inputs

– 180° phase shift between outputs

– Synch out 90° phase shift vs DC-DC1

– Programmable switching frequency divider

by 1, 2, 4, 8 between the two regulators

– The two buck converters can be connected

in parallel (for evaluation purposes only)

 Independent voltage supervisors/power-goods

with selectable thresholds through external pin:

– two available thresholds for UV/OV/PG

signals: 90-120-95% or 80-110-85%

(output voltage percentage)

 Soft-start, thermal protection

 One standby/linear regulator:

– Output selectable with external resistor

divider till 10 V

– Soft start, hardware enable pin

– 250 mA maximum current capability

– Standby operative mode

– Programmable power good thresholds

(85% or 95% output voltage percentage)

– Thermal protection

 Microcontroller reset with programmable

duration, activated by output under voltage or

watchdog fault

 External High Side Driver enable pin

 One integrated window watchdog (5 ms ≤

window ≤ 50 ms, with ± 20% tolerance)

 Short circuit protected outputs

 Low external components number

 Thermal shutdown junction temperature 150°C

LQFP64

(exposed pad up)

Table 1. Device summary

Order code

Package

Packing

L5964L-VYY

LQFP64 exp. pad up

Tray

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