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MAX15301AA01-CK

InTune Automatically Compensated Digital PoL Controller with Driver and PMBus Telemetry

Maxim Integrated 

MAX15301

InTune Automatically Compensated Digital PoL

Controller with Driver and PMBus Telemetry

The Functional Diagram shows the controller implemen-

tation using a digital state space compensator (model

predictive) controller, a microcontroller unit (MCU), a digi-

tal pulse-width modulator (DPWM), a PLL-based master

timing generator, and a PMBus serial communication port.

State-Space Controller and DPWM

The MAX15301 uses a digital pulse-width modulation

(DPWM) control scheme to regulate the output voltage.

Traditional PWM regulators (both analog and digital) use

classical control methods for DC-DC converters based

on linear models of a discrete time nature and root locus,

Bode and Nyquist plots. These linear time-invariant

approximations work well for small signals. However,

when large transients cause duty-cycle saturation, the

performance of the closed loop can be degraded (larger

overshoots) and the output transients will be “slower”

(large settling times). Tighter regulation performance dur-

ing these disturbances is becoming a requirement. The

MAX15301 addresses the issue by using model-predic-

tive-based feedback design to compensate the DPWM.

The MAX15301 automatically constructs a state-space

model (state estimator) of the control plant (Figure 1). The

internal model gives access to state control variables that

are otherwise unavailable. The state control variables are

used to set the proper control values. For a given input

to output step-down ratio and PWM switching frequency

the MAX15301 sets the compensation coefficients for

that application. Upon output enable, or in response to a

PMBus command, the MAX15301 will perform the InTune

calibration. During this calibration several powertrain

parameter values are measured and the extracted param-

eters are used to create the internal model to optimize the

bandwidth and transient response of the converter.

The state-space compensator block generates the duty-

cycle command for the DPWM block. The DPWM block

generates the required PWM outputs for the driver. The

state-space controller block also contains a digital-to-

analog converter that adjusts the gate-drive voltage. The

gate-drive voltage can be set using a PMBus command

(manufacturer specific) to a value between 5V and 8.5V

to improve the power-supply efficiency.

BabyBuck Regulator

The MAX15301 has an internal BabyBuck bias regula-

tor circuit to generate both the gate-drive voltage supply

and the internal digital supply to power the controller.

The BabyBuck bias regulator is an internal two output

switching regulator that uses a small (1008-size), low-

cost inductor. If the user is not concerned with optimizing

operating efficiency, the inductor can be omitted from the

designs (connect the LBI pin to the PWR pin through a

100kΩ resistor). In this configuration, the bias regulator

operates as a linear regulator (LDO). If an external gate-

drive voltage is available, the LBI pin can be connected

to VIN through a 2kΩ resistor and the GDRV pin can be

connected to the external source.

VIN

COMPENSATOR

1/x

�

DPWM

DRIVER

LOAD

A/D

STATE ESTIMATOR

Figure 1. State-Space Controller Concept

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