L5965 datasheet(2/73 Pages) STMICROELECTRONICS

2 / 73 page

Overview

L5965 is a multichannel voltage regulator easy to use, able to offer flexibility, together with a set of features that

make it compliant to car passenger applications that require a certain level of safety. The product includes input

and output monitors, independent band-gaps, ground loss monitors, internal compensation networks, that also

help to reduce the BOM, digital and analog BIST, fault pin.

In this product, there are 7 different regulators. A first battery-compatible regulator, a controller that can supply

several current flow thanks to the use of external MOSs. A second regulator with integrated MOS that can be

used as a pre-regulator for currents up to about 2.6 A. Two bucks, post regulators, one boost that can be used to

supply, for example, a CAN bus, one LDO and a 1% accurate reference voltage for the microcontroller.

All output voltages can be selected via memory cells (OTP) that can be programmed before using the PMIC. This

guarantees precision and safety, since output voltages are not susceptible to variations due to the external

environment. It also contributes to reduce the number of external components. Through the OTP it is also

possible to decide the switching frequency of some regulators, the current limitation, select the main buck and the

system power-on sequence.

Programming can also be done at customer’s production line.

There is also an SPI bus, used to program the PMIC and to communicate with the microcontroller. Through this

bus it is possible to set overvoltage and undervoltage thresholds, enable the spread spectrum, select the soft start

time and many other things. The SPI is also used to communicate the status of the bucks in case of fault, over-

temperature or other events.

The maximum free run switching frequency of the bucks is 2.4 MHz, modifiable through external synchronization

signals. In the case of battery-connected pre-regulators, 400 kHz operation is recommended.

The PMIC can manage watchdog and reset signals.

1.1

Simplified block diagram

Figure 1. Simplified block diagram

Pre-BUCK1

controller

Watchdog &

Reset

Pre-BUCK2

SPI

Voltage

references

INDEPENDENT SUPPLIES

Safety

management

SYNC_IN

SYNC_OUT

VBAT

BUCK3

Internal

compensation

BUCK4

Internal

compensation

BOOST

Supervisors

LDO

Supervisors

VREF

Supervisors

Diagnostics

Oscillator

WKUP

RESETB

FAULT

Buck pre/post regulator compatible to battery V

Buck post regulator compatible to 5.5 V max

Buck pre/post regulator compatible to battery V

5-3.8-3.3-1.8-1.2-1.1-1.0-0.8 V @ 0.4 MHz

5.0-3.6-3.3-1.5-1.35-1.2-1.1-1.0 V @ 1.35-2.6 A ● 0.4-2.4 MHz

3.3-2.5-2.3-2.0-1.8-1.35-1.2-1.0 V @ 1.4 A ● 2.4 MHz

3.3-1.8-1.35-1.3-1.25-1.2-1.12-1.1 V @ 1 A ● 2.4 MHz

5-3.3-2.8-2.5-1.8-1.3-1.25-1.2 V @ 300-600 mA

4.1 - 3.3 - 2.5 - 1.8 V @ 20 mA

7 V @ 0.2 A, 5 V @ 0.3 A ● 2.4 MHz

OTP

Internally connected to the battery

SPI

Note: Buck min peak currents.

Linear post regulator compatible to 5.5 V max

Boost post regulator compatible to 5.5 V max

GAPG1005181515PS

L5965

Overview

DS12567 - Rev 3

page 2/73

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