L5964 regulator Datasheet

L5964 Datasheet, PDF, Equivalent


Part Number

L5964

Description

Automotive monolithic dual 3.5 A step-down switching regulator

Manufacture

STMicroelectronics

Total Page 30 Pages
Datasheet
Download L5964 Datasheet


L5964
L5964
Automotive monolithic dual 3.5 A step-down switching regulator
with LDO
Datasheet - production data
LQFP64
(exposed pad up)
Features
AEC-Q100 qualified
Two step-down synchronous switching voltage
regulators with internal power switches:
– Wide operating input voltage range (from
3.3 V to 26 V)
– Output voltage selectable by external
divider (feedback voltage at 0.9 V)
– 0.9 V minimum output, maximum output
limited by maximum Duty Cycle
– DC/DCs can work in Low Power Mode for
reduced current consumption in low output
Load
– 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 4 A
– 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 regulators can be paralleled
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
Low EMI
Thermal shutdown junction temperature 150°C
Table 1. Device summary
Order code
Package
Packing
L5964L-VYY LQFP64 exp. pad up
Tray
L5964L-VYT LQFP64 exp. pad up Tape & Reel
July 2019
This is information on a product in full production.
DS12453 Rev 2
1/50
www.st.com

L5964
Contents
Contents
L5964
1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2 Pins description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.1 LQFP64 pins description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4 Application diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.2 Operating voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.3 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.5 Electrical characteristic curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6 Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6.1 Block description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6.1.1 Switching regulators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6.1.2 Low drop out (LDO) linear regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
6.2 Working modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
6.2.1 Shutdown mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
6.2.2 Normal mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
6.2.3 Microcontroller mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
7 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
7.1 Output inductor (L) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
7.2 Output capacitors (COUT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
7.3 Input capacitors (CIN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
7.4 Bootstrap capacitor (CBS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
7.5 Compensation network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
7.6 Power good delay time setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
7.7 Watch dog delay time setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
2/50 DS12453 Rev 2


Features L5964 Automotive monolithic dual 3.5 A step-down switching regulator with LDO Datasheet - production data LQFP64 (ex posed pad up) Features  AEC-Q100 qua lified  Two step-down synchronous sw itching voltage regulators with interna l power switches: – Wide operating in put voltage range (from 3.3 V to 26 V) – Output voltage selectable by extern al divider (feedback voltage at 0.9 V) – 0.9 V minimum output, maximum outpu t limited by maximum Duty Cycle – DC/ DCs can work in Low Power Mode for redu ced current consumption in low output L oad – Internal high-side/ low-side ND MOS – 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 4 A – Independent hardware e nabling pins – Independent supply inp uts – 180° phase shift between outpu ts – Synch out 90 ° phase shift vs D C-DC1 – Programmable switching freque ncy divider by 1, 2, 4, 8 between the two regulators – The two regulators can be paralleled  .
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