MB39C011A datasheet(2/53 Pages) CYPRESS

2 / 53 page

Document Number: 002-08369 Rev. *B

Page 2 of 53

MB39C011A

Contents

Pin Assignment............................................................. 3

Pin Description ............................................................ 4

Block Diagram............................................................... 5

Absolute Maximum Ratings......................................... 6

Recommended Operating Conditions ........................ 7

Electrical Characteristics............................................. 8

Typical Characteristics............................................... 10

Functional Description............................................... 12

8.1 DC/DC Converter Block................................................ 12

8.2 Protection Function....................................................... 13

Switching Scheme Selection ..................................... 20

10. Setting The Output Voltage........................................ 21

11. Setting The Triangular Oscillation Frequency ......... 22

11.1 Power Dissipation and Thermal Design........................ 22

12. Setting The Soft-start And Short-circuit Detection

Times............................................................................ 24

13. VB Pin And VH Pin Connections In Condition

Of Vcc Voltage............................................................. 24

14. Design Of Phase Compensation Circuit................... 26

14.1 Phase compensation circuit when low ESR capacitor is

used as output capacitor............................................... 26

14.2 Notes on Phase Compensation Circuit Constants........ 27

15. Handling the Unused Channel Pins when using

a Single Channel......................................................... 29

16. I/O Equivalent Circuit ................................................. 31

17. Example Application Circuit ...................................... 33

18. Parts List ..................................................................... 34

19. Part Selection.............................................................. 35

19.1 Coil selection ................................................................ 35

19.2 SW FET selection ......................................................... 36

19.3 Fly-back Diode Selection .............................................. 38

19.4 Output capacitor selection ............................................ 39

19.5 Input capacitor selection ............................................... 39

19.6 VB pin capacitor............................................................ 40

19.7 VH pin capacitor ........................................................... 40

20.

PCB Layout ................................................................ 41

21. Reference Data............................................................ 43

22. Usage Precaution ....................................................... 45

22.1 Do not configure the IC over the maximum ratings ...... 45

22.2 Use the device within the recommended operating

conditions...................................................................... 45

22.3 Printed circuit board ground lines should be set up with

consideration for common Impedance.......................... 45

22.4 Take appropriate measures against static electricity.... 45

22.5 Do not apply negative voltages..................................... 45

23. Ordering Information.................................................. 46

24. EV Board Ordering Information................................. 46

25. RoHS Compliance Information Of Lead (Pb) Free

Version......................................................................... 47

26. Marking Format (Lead-free version) ........................ 47

27. Labeling Sample (Lead-free version) ....................... 48

28. MB39C011APFT-

❏❏❏E1 Recommended Mounting

Conditions ................................................................... 49

28.1 Recommended Mounting Conditions............................ 49

28.2 Parameters for Each Mounting Method ........................ 50

29. Package Dimensions.................................................. 51

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