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STMicroelectronics Electronic Components Datasheet

L5963 Datasheet

Dual monolithic switching regulator

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L5963 pdf
L5963
Dual monolithic switching regulator with LDO and HSD
'!0'03
PowerSSO-36
(exposed pad)
'!0'03
PowerSSO-36
(slug-up)
Features
Two step-down synchronous switching voltage
regulators with internal power switches:
– Wide input voltage range (from 3.5 V to 26 V)
– Internal high-side/ low-side NDMOS
– 1 V minimum output
– 3.0 A load current
– 250 kHz free-run frequency
– 250 kHz < f < 2 MHz synchronization range
– Integrated soft-start
– Independent hardware enable pins
– Independent power supply
– 180° PWM output phase shift
– Programmable switching frequency divider
by 1, 2, 4 or 8 between the two DC/DC
regulators
– Power good function
One standby / linear regulator
– Output voltage programmable with external
resistor divider
– 250 mA maximum current capability
– Backup function
– Power good function
One high side driver
– 0.5 V max drop @ 0.5 A
– Protected against short to ground and
battery, loss of ground and battery,
unsupplied short to battery
Programmable under voltage battery detector
– Under voltage threshold adjustable through
dedicated pin (VDIN)
Load dump protection
Independent thermal protection on all
regulators
Independent current limit on all regulators
Datasheet - production data
Extremely low quiescent current in standby
conditions
Power good / adjustable voltage detector
outputs to realize customized power up/down
sequences
Description
L5963 is a dual step-down switching regulator
with internal power switches, high side driver and
a low drop-out linear regulator that can operate as
standby regulator or normal LDO.
All the regulators can be connected directly to the
vehicle battery. In addition to an adjustable
voltage detector, voltage supervisors are
available.
The two DC-DC converters can work in free-run
condition or synchronize themselves to an
external clock. DC/DCs' PWM outputs have a
180° phase shift.
The high operating frequency allowed by the
synchronization input helps to reduce AM and FM
interferences and grants the use of small and low
cost inductors and capacitors.
This IC finds application in the automotive
segment, where load dump protection and wide
input voltage range are mandatory.
A slug-up package option is available for
applications which require heatsink use.
In standby condition the device guarantees
extremely low quiescent current (25 μA typical @
-40 °C < T < 85 °C)
Table 1. Device summary
Order code
Package
Packing
L5963D-EHX
L5963D-EHT
L5963U-KBX
L5963U-KBT
PowerSSO36
(exposed pad)
PowerSSO36
(slug-up)
Tube
Tape & Reel
Tube
Tape & Reel
October 2015
This is information on a product in full production.
DocID028553 Rev 1
1/45
www.st.com


STMicroelectronics Electronic Components Datasheet

L5963 Datasheet

Dual monolithic switching regulator

No Preview Available !

L5963 pdf
Contents
Contents
L5963
1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3 Application diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4 Pins description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
6.1 Operative modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
6.2 Blocks functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
6.2.1 Unregulated supply input voltage (VINLDO) . . . . . . . . . . . . . . . . . . . . . 17
6.2.2 Low voltage warning monitor (related pins: VDIN, VDOUT, VDDLY) . . . 17
6.2.3 Power-good reset (related pins: LDOOK, LDOOKDLY) . . . . . . . . . . . . . 18
6.2.4 Power-good function of DC/DC1 (related pins: SW1OK, SW1OKDLY) . 18
6.2.5 Over voltage shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
6.2.6 Power ground (PGND1 and PGND2) . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.2.7 Signal ground (SGND) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.2.8 PWM signal ground (SWGND) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.2.9 TAB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.2.10 Linear regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.2.11 High-side driver (HSD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6.2.12 Switching regulators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
7 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
7.1 Output inductor (Lo) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
7.2 Output capacitors (COUT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
7.3 Input capacitors (CIN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
7.4 Bootstrap capacitor (CBOOT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
2/45 DocID028553 Rev 1


Part Number L5963
Description Dual monolithic switching regulator
Maker STMicroelectronics
Total Page 30 Pages
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