ence, digitally trimmed, assures the selected out-

put voltage to within +/-1% over temperature and

battery voltage variations.

Thanks to the remote sensing inputs and to the

window comparator system, embedded in the er-

ror summing structure, the device provides excel-

lent load transient performance. The high peak

current gate drive affords to have fast switching

to the external power mos, performing an high ef-

ficiency. A complete power management include

on board a programmable power-up sequencing,

power good signal, skip mode operation and un-

dervoltege detection. The L5996 assures a fast

protection against load overvoltage and load

overcurrent. Linear regulator on-board is avail-

able with an output voltage of 2.5V (+/-2%) and a

current capability of

150mA, useful for CPU

CLOCK BUS.

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

SSTART

DISPROT

V5SW

VIN

ENABLE

REG5

LRSNS

HRSNS

ICURLIM

OSC

FREQ

VID4

VID3

VID2

VID0

VID1

D98IN998

910

PIN CONNECTION

LRSNS

HRSNS

COMP

27

26

HSTRAP

HGATE

HSRC

Cboot

Rsense

VIN

29

30

RGATE

PWRGND

C

Load

Hside

Lside

CONTROL

LOGIC

OVER CURRENT

COMPARATOR

ZERO CROSSING

COMPARATOR

PULSE SKIPPING

COMPARATOR

+

-

+

-

+

-

SOFT

START

HRSNS

LRSNS

6

CSOFT

SSTART

14

13

VBG

15

4

2

VPROG

5

1

DISPROT

ENABLE

OSC

31

18

17

FREQ

OSCILLATOR

and

SYNC

OVER/UNDER VOLTAGE

COMPARATOR

5V

PWGOOD

32

NOSKIP

25

LINEAR

REGULATOR

POWER

MANAGEMENT

D98IN999

L

RSTRAP

16

SNSGND

12

VFB

VSS

PROGRAMMABLE

BANDGAP &

REFERENCE

VID0

VID1

VID2

VID3

20

21

22

23

INTERNAL SUPPLY

REG5

V5SW

11

3

2.5V

LIN.

REG.

19

ICURLIM

VPROG

C5

VIN

Vdc

5.5V to 25V

REG5

SLOPE

+

-

+

-

+

-

ERROR

SUMMING

7

8

VPROG

10

28

9

WINDOW

COMP

VCPUCLK

24

VID4

BLOCK DIAGRAM

DESCRIPTION (Continued)

ABSOLUTE MAXIMUM RATINGS

Symbol

Parameter

Value

Unit

VIN to PWRGND

-0.5 to 27

V

PWRGND to VSS

±0.5

V

VREFS to PWRGND

5

V

HSTRAP, HGATE to PWRGND

-0.5V to VIN+14V

RSTRAP, RGATE to PWRGND

-0.5V to 14V

EABLE, FREQ, OSC, COMP, VFB, HRSNS, LRSNS

5

V

VID0-3, NOSKIP

7

V

Junction Temperature Range

-40 to 150

°C

Storage Temperature Range

-55 to 150

°C

L5996

2/9