L5994 - L5994A

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DESCRIPTION (continued)

The device produces an adjustable regulated voltage in both sections and a linear regulated voltage with an

external bipolar such as for PCMCIA applications.

The auxiliary linear driver is able to source up to 1A for 12V bus and is also possible to use it for the regulation

of 2.5V from 5V bus.

Synchronous rectification and pulse skipping mode for the buck sections optimise the overall efficiency over a

wide load current range.

The two high performance PWM output sections are monitored for over voltage, under voltage and over current

conditions.

A POWER GOOD signal is provided for each section.

On detection of a fault, the relevant POWER GOOD signal is generated and a specific shutdown procedure

takes place to prevent physical damage and data corruption.

A disable function allows to manage the output power sections separately, optimising the quiescent consump-

tion of the IC in stand-by conditions.

The internal architecture is a current mode that allows to have fast transient response without compromise the

efficiency due to the ultra low sense resistor.

Under voltage shutdown is forced in case of short circuit in one of the two sections.

The drivers are provided of an adaptative anti cross conduction system for high output current application

ABSOLUTE MAXIMUM RATINGS

THERMAL DATA

PIN CONNECTIONS (Top views)

Symbol

Parameters

Value

Unit

Power Supply Voltage

0 to 27

V

Maximum pin voltage to pins 1,24,25,32

V

Symbol

Parameters

Value

Unit

Thermal Resistance Junction to Ambient

60

°C/W

Operative Junction Temperature Range

-40 to 140

°C

1

2

3

5

6

4

7

8

11 12 13 14 15 16

32

30

31

29 28 27 26 25

19

18

17

24

23

22

20

21

I1SNS

V1SNS

V5SW

VIN

H1STRAP

SREG5

COMP1

SOFT1

I2SNS

COMP2

SOFT2

H2STRAP

PWROK2

VFBLIN

V2SNS

VDRLIN

D98IN863B

910