ISL8274M datasheet(21/81 Pages) RENESAS

21 / 81 page

FN8931 Rev.1.00

Page 21 of 81

Jan 4, 2018

ISL8274M

4. Functional Description

Functional Description

4.1

SMBus Communications

The ISL8274M provides a PMBus digital interface that enables the user to configure all aspects of the module

operation as well as monitor the input and output parameters. The ISL8274M can be used with any SMBus host

device. In addition, the module is compatible with PMBus Power System Management Protocol Specification Parts

I and II version 1.2. The ISL8274M accepts most standard PMBus commands. When configuring the device using

PMBus commands, it is recommended that the enable pin is tied to SGND.

The SMBus device address is the only parameter that must be set by the external pins. All other device parameters

can be set using PMBus commands.

The ISL8274M can operate without the PMBus in pin-strap mode with configurations programmed by pin-strap

resistors, such as output voltage, ASCR setting, switching frequency, OCP limit, device SMBus address, input

UVLO, soft-start/stop, and tracking.

4.2

Output Voltage Selection

The output voltages of both channels may be set to a voltage between 0.6V and 5V if the input voltage is higher

than the desired output voltage by an amount sufficient to maintain regulation.

The VSET1/2 pins are used to set the output voltage VOUT1/2 to levels as shown in Table 3. The RSET1/2 resistor

is placed between the VSET1/2 pins and SGND. A standard 1% resistor is required.

Table 3. Output Voltage Resistor Settings

VOUT1/2 (V)

RSET1/2 (kΩ)

1LOW

1.5

OPEN

3.3

HIGH

0.6

0.675

0.7

12.1

0.72

13.3

0.75

14.7

0.8

16.2

0.85

17.8

0.9

19.6

0.93

21.5

0.95

23.7

0.98

26.1

1.03

28.7

1.05

31.6

1.1

34.8

1.12

38.3

1.15

42.2

1.2

46.4

1.25

51.1

1.3

56.2

1.35

61.9

ISL8274M датащи(PDF) 21 Page - Renesas Technology Corp

ISL8274M датащи(HTML) 21 Page - Renesas Technology Corp

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81

датащи скачать

ссылки URL