LTC2977 datasheet(43/138 Pages) AD

43 / 138 page

LTM4664A

Rev. 0

For more information www.analog.com

NOTE: Per the PMBus specification, pin programmed

parameters can be overridden by commands from the

digital interface with the exception of ASEL which is

always honored. Do not set any part address to 0x5A or

0x5B because these are global addresses and all parts will

respond to them.

Table 1. VOUTCn _CFG Pin Strapping Look-Up Table for

the LTM4664A’s PSM Output Voltages, Coarse Setting (Not

Applicable if MFR_CONFIG_ALL[6] = 1b)

RVOUTn_CFG

TOP (kΩ)

RVOUTn_CFG*

BOT (kΩ)

VOUTn (V)

SETTING

COARSE

MFR_PWM

MODEn[1] BIT

14.3

Open

NVM

14.3

32.4

NVM

14.3

22.6

3.3

14.3

18.0

3.1

14.3

15.4

2.9

14.3

12.7

2.7

14.3

10.7

2.5

0, if VTRIMn > 0mV

1, if VTRIMn ≤ 0mV

14.3

9.09

2.3

14.3

7.68

2.1

14.3

6.34

1.9

14.3

5.23

1.7

14.3

4.22

1.5

14.3

3.24

1.3

14.3

2.43

1.1

14.3

1.65

0.9

14.3

0.787

0.7

14.3

0.5

*RVOUTCn_CFG value indicated is nominal. Select RVOUTCn_CFG from a

resistor vendor such that its value is always within 3% of the value

indicated in the table. Take into account resistor initial tolerance, T.C.R.

and resistor operating temperatures, soldering heat/IR reflow, and

endurance of the resistor over its lifetime. Thermal shock/cycling,

moisture (humidity) and other effects (depending on one’s specific

application) could also affect RVOUTCn_CFG’s value over time. All such

effects must be taken into account in order for resistor pin strapping to

yield the expected result at every SVIN power-up and/or every execution

of MFR_RESET or RESTORE_ USER_ALL, over the lifetime of one’s

product.

Table 2. VTRIMn_CFG Pin Strapping Look-Up Table for the

LTM4664A’s PSM Output Voltages, Fine Adjustment Setting

(Not Applicable if MFR_CONFIG_ALL[6] = 1b)

RVTRIMn_CFG*

BOT (kΩ)

VTRIM (mV) FINE ADJUSTMENT

TO VOUTn SETTING WHEN

RESPECTIVE

RVTRIMn_CFG

TOP (kΩ)

Open

14.3

32.4

14.3

22.6

86.625

14.3

18.0

74.25

14.3

15.4

61.875

14.3

12.7

49.5

14.3

10.7

37.125

14.3

9.09

24.75

14.3

7.68

12.375

14.3

6.34

–12.375

14.3

5.23

–24.75

14.3

4.22

–37.125

14.3

3.24

–49.5

14.3

2.43

–61.875

14.3

1.65

–74.25

14.3

0.787

–86.625

14.3

–99

14.3

*RVTRIMCn_CFG value indicated is nominal. Select RVTRIMCn_CFG from

a resistor vendor such that its value is always within 3% of the value

indicated in the table. Take into account resistor initial tolerance, T.C.R. and

resistor operating temperatures, soldering heat/IR reflow, and endurance

of the resistor over its lifetime. Thermal shock/cycling, moisture

(humidity) and other effects (depending on one’s specific application)

could also affect RVTRIMCn_CFG’s value over time. All such effects must be

taken into account in order for resistor pin strapping to yield the expected

result at every SVIN power-up and/or every execution of MFR_RESET, or

RESTORE_USER_ALL over the lifetime of one’s product.

Example:

ROUTCn_CFG TOP

ROUTCn_CFG BOT

SGND_C0_C1

VOUTCn_CFG PIN

VDD25

DUAL 25A/30A PSM OPERATION

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