IR36021 datasheet(32/41 Pages) IRF

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IR36021

DIGITAL POL BUCK CONTROLLER with I2C AND PMBus

Interface

February 27, 2013 | Rev 3.5

Accuracy Optimization Registers

The IR36021 provides excellent factory‐trimmed chip

accuracy. In addition, the designer has calibration

capability that can be used to optimize accuracy for a given

design with minimum component changes. Once a design

has been optimized the IR36021 will provide excellent

repeatability from board to board. The IR36021 also

provides the capability for individual board calibration and

programming in production for the best accuracy. Table 27

shows the MTP registers used to fine tune the accuracy of

the reported measurements. Figures 38 to 40 show the

typical accuracy of the output current, input voltage and

output voltage measurements using the IR36021.

TABLE 27: ACCURACY OPTIMIZATION REGISTERS

NVM Register

Function

IIN Fixed

Offset

Offsets the input current in 1/32A steps

e.g. driver Icc which can be 5‐8mA per

driver

IIN Per Phase

Offset

Offsets the input current dependent

upon the number of active phases in

1/128A steps e.g. the drive current for

the MOSFET

‟s. This current increases

every time a new phase is added

IOUT Current

Offset

Offsets the output current from

‐8A to +7.5A in 0.5A steps (loop 1) and

‐4A to +3.75A 0.25A steps (loop 2)

Vout Offset

Offsets the output voltage +40mV to ‐

35mV in 5mV steps.

Temperature

Offset

Offsets the temperature in 1°C steps

e.g. to compensate for offset between

the hottest component and the NTC

sensing location.

-20%

-15%

-10%

-5%

10%

15%

20%

1020

5060708090

100

E-Load (A)

Iout Error

CPU spec with 7% inductors

Figure 38: I2C IOUT Error using 10% DCR inductors

-1.0%

-0.5%

0.0%

0.5%

1.0%

11.7

11.8

11.9

12.1

12.2

12.3

204060

100

E-Load (A)

Vin (DMM)

Vin (I2C)

Vin error (2nd axis)

Figure 39: I2C Input Voltage Measurements

-1.00%

-0.75%

-0.50%

-0.25%

0.00%

0.25%

0.50%

0.75%

1.00%

0.850

0.875

0.900

0.925

0.950

0.975

1.000

1.025

1.050

20406080

100

E-Load (A)

Vout (DMM)

Vout (I2C)

Vout error (2nd axis)

Figure 40: I2C Output Voltage Measurements

I2C SECURITY

The IR36021 provides robust and flexible security options

to meet a wide variety of customer applications.

A combination of hardware pin and software password

prevents accidental overwrites, discourages hackers,

and secures custom configurations and operating data.

The Read and Write Security Zones can be in set in MTP

(Tables 28 and 29) with the protection methods shown

in Table 30.

TABLE 28: READ SECURITY ZONES

Zone

Access when

Locked

Unlocked

Open

All

Configuration

Control &

Telemetry

All

Telemetry

All

Secure

None

All

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