VLF4012AT-2R2M datasheet(2/32 Pages) CYPRESS

2 / 32 page

Document Number: 002-08361 Rev. *C

Page 2 of 32

MB39C014

Contents

Description ............................................................................. 1

Features .................................................................................. 1

Applications ........................................................................... 1

Contents ................................................................................. 2

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

2. Pin Descriptions ............................................................... 3

3. I/O Pin Equivalent Circuit Diagram ................................. 4

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

4.1 Current Mode ............................................................ 6

5. Function Of Each Block ................................................... 7

5.1 PWM Logic Control Circuit ........................................ 7

5.2 IOUT Comparator Circuit ........................................... 7

5.3 Error Amp Phase Compensation Circuit ................... 7

5.4 VREF Circuit.............................................................. 7

5.5 POWERGOOD Circuit ............................................... 7

5.6 Protection Circuit ....................................................... 8

6. Absolute Maximum Ratings ............................................ 9

7. Recommended Operating Conditions .......................... 10

8. Electrical Characteristics ............................................... 11

9. Test Circuit For Measuring Typical Operating

Characteristics ................................................................. 13

10. Application Notes ......................................................... 14

10.1 Selection of Components ...................................... 14

10.2 Output Voltage Setting .......................................... 15

10.3 About Conversion Efficiency ................................. 15

10.4 Power Dissipation and Heat Considerations ......... 16

10.5 Transient Response .............................................. 16

10.6 Board Layout, Design Example ............................. 17

10.7 Layout Example of IC SW Components ................ 17

10.8 Notes for Circuit Design ........................................ 17

11. Example Of Standard Operation Characteristics ...... 18

12. Application Circuit Examples ...................................... 27

12.1 Application Circuit Example 1 ................................ 27

12.2 Application Circuit Example 2 ................................ 27

12.3 Application Circuit Example Components List ....... 28

13. Usage Precautions ....................................................... 29

14. Ordering Information .................................................... 29

15. RoHS Compliance Information .................................... 29

16. Package Dimension ...................................................... 30

Document History ................................................................ 31

Sales, Solutions, and Legal Information ........................... 32

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