AS3693B

austriami crosyst ems

www.austriamicrosystems.com

Revision 1.21 / 2011-09-30

3 - 32

Table of Contents

1

General Description ....................................................................................................................................... 1

2

Key Features.................................................................................................................................................. 1

3

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

4

Block Diagram................................................................................................................................................ 2

5

Characteristics ............................................................................................................................................... 4

5.1

Absolute Maximum Ratings .................................................................................................................... 4

5.2

Operating Conditions .............................................................................................................................. 5

5.3

Electrical Characteristics......................................................................................................................... 6

6

Typical Operation Characteristics .................................................................................................................. 8

6.1

Output current vs Output Voltage ........................................................................................................... 8

6.2

Vsupply vs VREG and V2.5 at startup .................................................................................................... 8

6.3

9us Slew Rate......................................................................................................................................... 9

6.4

Supply Regulation................................................................................................................................... 9

7

Block Description ......................................................................................................................................... 10

7.1

Feedback Circuit................................................................................................................................... 10

7.1.1

Feedback Selection ....................................................................................................................... 11

7.1.2

Voltage fault registers .................................................................................................................... 12

7.2

Curreg 1-16........................................................................................................................................... 12

7.3

PWM – modes ...................................................................................................................................... 14

7.3.1

SYNC mode (PWM_MODE = 00).................................................................................................. 14

7.3.2

ASYNC – mode (PWM_MODE = 01) ............................................................................................ 16

7.4

PWM – high time, period and delay registers ....................................................................................... 17

7.5

Shunt Regulator.................................................................................................................................... 18

7.5.1

Undervoltage lockout ..................................................................................................................... 18

7.6

Over temperature control ...................................................................................................................... 18

7.7

Device address setup ........................................................................................................................... 19

7.7.1

I2C Device Address setup ............................................................................................................. 19

7.7.2

SPI Device Address setup ............................................................................................................. 19

7.8

Digital interface ..................................................................................................................................... 20

7.8.1

I2C interface .................................................................................................................................. 20

7.8.2

SPI interface .................................................................................................................................. 22

8

Register map................................................................................................................................................ 24

9

Pinout and Packaging .................................................................................................................................. 27

9.1

Pinout.................................................................................................................................................... 27

9.2

Package drawing epTQFP64............................................................................................................... 29

9.3

Package drawing QFN64...................................................................................................................... 30

10 Ordering Information .................................................................................................................................... 31

Copyright............................................................................................................................................................. 32

Disclaimer ........................................................................................................................................................... 32

Contact Information............................................................................................................................................. 32