DIGITAL POL BUCK CONTROLLER with I2C AND PMBus
Interface
IR36021
FEATURES
Dual output
(2+1) Digital Controller with proprietary
control algorithm
Two‐phase operation available on Output #1 for
powering very high current ASICs and DSPs
I2C /PMBus interface for configuration & telemetry
with pin programmable address
Operating ambient temperature: ‐40
0
C to 85
0
C
3.3V bias operation
Independent loop switching frequencies from 200kHz
to 2MHz per phase
IR
Efficiency Shaping with Dynamic Phase Control
(DPC)
Active Diode Emulation modes for light load efficiency
IR Adaptive Transient Algorithm (ATA) minimizes
output bulk capacitors and system cost
Independent OVP, UVP, OCP for each output
Thermal Protection (OTP) and VRHOT# flag
Multiple time programmable (MTP) memory for
custom configuration
Flexible I2C bus security features
Pb‐Free, RoHS, 32‐pin 5mm X 5mm QFN package
DESCRIPTION
The IR36021 is a dual‐loop digital multi‐phase buck
controller designed for point of load applications.
The IR36021 include Efficiency Shaping Technology to
deliver exceptional efficiency at minimum cost across the
entire load range. Dynamic Phase Control adds/drops
active phases based upon load current and can be
configured to enter 1‐phase operation and diode emulation
mode automatically or by command.
IR’s unique Adaptive Transient Algorithm (ATA), based on
proprietary non‐linear digital PWM algorithms, minimizes
output bulk capacitors and Multiple Time Programmable
(MTP) storage saves pins and enables a small package size.
Device configuration and fault parameters are easily
defined using the IR Intuitive Power Designer (IPD) GUI and
stored in on‐chip MTP.
The IR36021 provides extensive OVP, UVP, OCP and OTP
fault protection and includes thermistor based temperature
sensing with VRHOT signal.
The IR36021 includes numerous features like register
diagnostics for fast design cycles and platform
differentiation, truly simplifying VRD design and enabling
fastest time‐to‐market (TTM) with “set‐and‐forget”
methodology.
BASIC APPLICATION
APPLICATIONS
Embedded Telecom Systems
Netcom Applications
Server Application
Distributed Point of Load Power Architectures
PIN DIAGRAM
IRTN1a
ISEN1a
IRTN1b
RCSM1
RCSP1
ISEN1b
IRTN2
SM_DIO
ISEN2
SM_CLK
VRHOT_ICRIT
ADDR_PROT
VINSEN
NC
SM_ALERT
EN1
Figure 1: IR36021 Basic Application Circuit
Figure 2: IR36021 Package Top View
1
February 27, 2013 | Rev 3.5
Power technology
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EEWORLD
