IR36021 datasheet(15/41 Pages) IRF

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IR36021

DIGITAL POL BUCK CONTROLLER with I2C AND PMBus

Interface

February 27, 2013 | Rev 3.5

precision ADC. An anti‐alias filter provides the necessary

high frequency noise rejection. The gain and offset of the

voltage sense circuitry for each loop is factory trimmed to

deliver the required accuracy.

CURRENT SENSE

Lossless inductor DCR or precision resistor current sensing

is used to accurately measure individual phase currents.

Using a simple off‐chip thermistor, resistor and capacitor

network for each loop, a thermally compensated loadline

is generated to meet the given power system requirement.

A filtered voltage, which is a function of the total load

current and the target loadline resistance, is summed into

each voltage sense path to accomplish the Active Voltage

Positioning (AVP) function.

MOSFET DRIVER AND DRMOS COMPATIBILITY

The output PWM signals of the IR36021 are designed for

compatibility with the CHL85xx family of active tri‐level

(ATL) MOSFET drivers. CHL85xx drivers have a fast disable

capability which enables any phase to be turned off

on‐the‐fly. It supports power‐saving control modes,

improved transient response, and superior on the fly phase

dropping without having to route multiple output disable

(ODB or SMOD) signals.

In addition, the IR36021 provides the flexibility to

configure PWM levels to operate with external MOSFET

drivers or driver‐MOSFET (DrMOS) devices that support

Industry standard +3.3V tri‐state signaling.

I2C & PMBUS INTERFACE

An I2C or PMBus interface is used to communicate with

the IR36021. This two‐wire serial interface consists of clock

and data signals and operates as fast as 1MHz. The bus

provides read and write access to the internal registers for

configuration and monitoring of operating parameters and

can also be used to program on‐chip non‐volatile memory

(MTP) to store operating parameters.

To ensure operation with multiple devices on the bus, an

exclusive address for the IR36021 is programmed into

MTP. The IR36021, additionally, supports pin‐programming

of the address.

To protect customer configuration and information,

the I2C interface can be completely locked to provide no

access or configured for limited access with a 16‐bit

software password. Limited access includes both write and

read protection options. In addition, there is a telemetry

only mode which allows reads from the telemetry registers

only.

The IR36021 provides a hardware pin security option to

provide extra protection. The protect pin is shared with the

ADDR_PROT pin and is automatically engaged once the

address is read. The pin must be driven high to disable

protection. The pin can be enabled or disabled by a

configuration setting in MTP.

The IR36021 supports the packet error checking (PEC)

protocol and a number of PMBus commands to monitor

voltages and currents. Refer to the PMBus Command

Codes section on page 37.

IR DIGITAL POWER DESIGN CENTER (DPDC) GUI

The IR DPDC GUI provides the designer with a

comprehensive

design

environment

that

includes

screens to calculate VR efficiency and DC error budget,

design the thermal compensation networks and feedback

loops, and produce calculated Bode plots and output

impedance plots. The DPDC environment is a key utility for

design optimization, debug, and validation of designs that

save designer significant time, allowing faster time‐to‐

market (TTM).

The DPDC also allows real‐time design optimization and

real‐time monitoring of key parameters such as output

current and power, input current and power, efficiency,

phase currents, temperature, and faults.

The IR DPDC GUI allows access to the system configuration

settings for switching frequency, MOSFET driver

compatibility, soft start rate, automatic power state and

diode emulation, loop compensation, transient control

system parameters, input under‐voltage, output over‐

voltage, output under‐voltage, output over‐current and

over‐temperature.

PROGRAMMING

Once a design is complete, the DPDC produces a complete

configuration file.

The configuration file can be re‐coded into an I2C/PMBus

master (e.g. a Test System) and loaded into the IR36021

using the bus protocols described on page 35. The IR36021

has a special in‐circuit programming mode that allows the

MTP to be loaded at board test in mass production without

powering on the entire board.

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