STPM066S datasheet(2/67 Pages) STMICROELECTRONICS

2 / 67 page

Overview

STPM066S 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 functional 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.

STPM066S provides 4 different power rails. A battery-compatible regulator with integrated MOS that can be used

as a pre-regulator for currents up to about 2.6 A. One boost that can be used to supply, for example, a CAN bus,

one linear regulator and 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 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, switch on/off some regulators when required and many other things. The SPI is also used to communicate

the status of the regulators 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.

The PMIC can manage watchdog and reset signals.

1.1

Simplified block diagram

Figure 1. Simplified block diagram

Watchdog &

Reset

SPI

Power

management

INDEPENDENT SUPPLIES

Safety

management

VBAT

BUCK

Internal

compensation

BOOST

Supervisors

LDO

Supervisors

VREF

Supervisors

Diagnostics

Oscillator

RESETB

FAULT

Buck pre/post regulator compatible with battery V

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

management

OTP

Internally connected to the battery

4.1-3.3-2.5-1.8 V @ 20 mA

SPI

7 V @ 0.2 A, 5 V @ 0.3 A ● 2.4 MHz

Boost post regulator compatible with 5.5 V max

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

Linear post regulator compatible with 5.5 V max

STPM066S

Overview

DS12976 - Rev 2

page 2/67

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