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L5955

Multiple multifunction voltage regulator for car radio

STMicroelectronics 

Functional description

3

Functional description

L5955

The three high side drivers are one 2A output (HSD1) and two 450mA outputs (HSD2 & 3).

The six regulator outputs are 10V at 40mA (REG1), 8.5V at 200mA (REG2), 3.3V at 850mA

(REG3), 8/10V at 1A (REG4), 1.8V/3.3V/5V at 250mA (REG5) and 1.8V/2.5V at 200mA

(REG6).

The two stand-by regulators are 3.3V at 125mA (ST-BY1) and 1.5V at 300mA (ST-BY2).

ST-BY1 and ST-BY2 are equipped with Reset function.

ST-BY1 and ST-BY2 share one Reset output (MRST).

A slew rate limiter and a sequencing function control ST-BY1 and ST-BY2 turn on/off.

The 8.5V regulator output (REG2) has a tighter tolerance output than the other regulator

outputs.

The 8.5V output is a ±2.5% (5% total range) output over temperature to improve

performance and reduce cost on the 8.5V output. The other outputs are ±5% over

temperature.

The two STAND-BY regulators are switched on/off from battery line.

The REG3 is switched on/off by Enable pin which also activate the I2C BUS.

The other Regulators and HSD’s are turned on/off independently by I2C BUS, which also

controls the regulators' output voltages.

With ENABLE pin set to 0 the total current sunk from the battery line minimized.

Figure 3. Reset and power-on reset schematic

5V

1μA

VSTBY1

VSTBY2

FOR MRST

REG6

FOR RSTR6

MA

5.6pF

IVCP(1FAULT)

PULL DOWN

LATCH

SQ

FF2

RQ

rst*

RESET DRIVER

LATCH

SQ

FF1

RQ

5V

1μA

MB

WINDOW

COMPARATOR

RST*

CRSTDLY

0.22

μF

D02AU1401

10/17

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