L7983 datasheet(42/43 Pages) STMICROELECTRONICS

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List of figures

Figure 1.

Typical application circuit ............................................................. 3

Figure 2.

Block diagram .................................................................... 3

Figure 3.

Pin connection (top view) ............................................................. 4

Figure 4.

Control loop block diagram........................................................... 10

Figure 5.

Output voltage programming - adjustable version ........................................... 11

Figure 6.

Output voltage programming - fixed version ............................................... 11

Figure 7.

LNM selected, no load .............................................................. 12

Figure 8.

LCM selected, no load .............................................................. 13

Figure 9.

LCM selected, 10 mA load ........................................................... 13

Figure 10.

LCM selected, 50 mA load ........................................................... 14

Figure 11.

LCM to LNM transition, no load........................................................ 14

Figure 12.

RVCC = 0 Ω, dithering enabled, no load.................................................. 16

Figure 13.

RVCC = 0 Ω, dithering enabled, no load. Detail............................................. 16

Figure 14.

Turn-on example.................................................................. 17

Figure 15.

Turn-off example.................................................................. 18

Figure 16.

Input voltage turn-on threshold programming .............................................. 18

Figure 17.

Output voltage and RST behavior ...................................................... 19

Figure 18.

Peak current limit ................................................................. 20

Figure 19.

Valley current limit................................................................. 20

Figure 20.

Negative current limit example ........................................................ 21

Figure 21.

Overvoltage protection.............................................................. 22

Figure 22.

Evaluation board schematic .......................................................... 26

Figure 23.

PCB layout (Top).................................................................. 27

Figure 24.

PCB layout (Bottom) ............................................................... 27

Figure 25.

12 V efficiency (LCM) .............................................................. 28

Figure 26.

12 V load regulation (LCM)........................................................... 28

Figure 27.

12 V efficiency (LNM) .............................................................. 29

Figure 28.

12 V load regulation (LNM)........................................................... 29

Figure 29.

12 V input current - LCM ............................................................ 29

Figure 30.

12 V input current and FSW - LNM ..................................................... 29

Figure 31.

3.3 V fix efficiency (LCM) ............................................................ 30

Figure 32.

3.3 V fix load regulation (LCM) ........................................................ 30

Figure 33.

3.3 V fix efficiency (LNM) ............................................................ 31

Figure 34.

3.3 V fix load regulation (LNM) ........................................................ 31

Figure 35.

3.3 V fix input current, no load (LCM).................................................... 31

Figure 36.

3.3 V fix input current, no load (LNM).................................................... 31

Figure 37.

5 V fix efficiency (LCM) ............................................................. 32

Figure 38.

5 V fix load regulation (LCM) ......................................................... 32

Figure 39.

5 V fix efficiency (LNM) ............................................................. 33

Figure 40.

5 V fix load regulation (LNM) ......................................................... 33

Figure 41.

5 V fix input current, no load (LCM) ..................................................... 33

Figure 42.

5 V fix input current, no load (LNM) ..................................................... 33

Figure 43.

DFN10 (3 x 3 x 0.8 mm) package outline ................................................. 35

Figure 44.

DFN10 (3 x 3 x 0.8 mm) recommended footprint ............................................ 36

L7983

List of figures

DS13354 - Rev 1

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