Functional description

L5955

10/17

3

Functional description

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.

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

MA

5.6pF

rst*

RESET DRIVER

LATCH

PULL DOWN

LATCH

WINDOW

COMPARATOR

CRSTDLY

RST*

1

μA

5V

MB

1

μA

0.22

μF

5V

VSTBY1

FOR MRST

REG6

FOR RSTR6

VSTBY2

R

SQ

Q

R

SQ

Q

FF1

FF2

D02AU1401