www.irf.com | © 2016 International Rectifier February 8, 2016 | V1.6
1
3+1 Dual Output Digital Multi-Phase Controller
FEATURES
Ultra Low Quiescent Power Dual output 3+1 phase
PWM Controller
Intel
®
VR12 Rev 1.7, VR12.5 Rev 1.5, IMVP8 Rev 1.2,
AMD SVID2, and Memory VR modes
Switching frequency from 194KHz to 2MHz per phase
in 56 steps
IR Efficiency Shaping Features including Dynamic
Phase Control and Automatic Power State Switching
Programmable 1-phase or 2-phase operation for Light
Loads and Active Diode Emulation for very Light
Loads
IR Adaptive Transient Algorithm (ATA) on both loops
minimizes output bulk capacitors and system cost
Auto-Phase Detection with PID Coefficient auto-
scaling
Fault Protection: OVP, UVP, OCP, OTP, CAT_FLT
I2C/SMBus/PMBus system interface for reporting of
Temperature, Voltage, Current & Power telemetry for
both loops
Multiple Time Programming (MTP) with integrated
charge pump for easy non-volatile programming
Compatible with 3.3V tri-state drivers
+3.3V supply voltage; -40
o
C to 85
o
C ambient
operation; -40
o
C to 125
o
C junction
Pb-Free, RoHS, 5x5mm 40-pin, 0.4mm pitch QFN
APPLICATIONS
Intel® VR12, VR12.5 and IMVP8 (overclocking only),
AMD SVI2 based systems
Servers and High End Desktop CPU VRs
High Performance Graphics Processors, Memory VR
DESCRIPTION
The IR35204 is a dual-loop digital multi-phase
buck controller designed for CPU voltage
regulation, and is fully compliant with Intel
®
, VR12
Rev 1.7, VR12.5 Rev 1.5, IMVP8
2
Rev 1.2, and
AMD SVI2 REV 1.06 specifications.
The IR35204 includes IR’s Efficiency Shaping
Technology to deliver exceptional efficiency at
minimum cost across the entire load range. IR’s
Dynamic Phase Control adds/drops phases based
upon load current. The IR35204 can be configured
to enter 1 or 2-phase PS1 operation and active
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.
IR35204 has 127 possible address values for both
the PMBus and I2C bus interfaces. The device
configuration can be easily defined using the IR
PowIRCenter GUI, and is stored in the on-chip
Non-Volatile Memory (NVM). This reduces external
components and minimizes the package size.
The IR35204 provides extensive OVP, UVP, OCP,
OTP & CAT_FLT fault protection, and includes
thermistor based temperature sensing or per
phase temperature reporting when using the IR
powIRstage. The controller is designed to work
with either Rdson current sense PowIRstages or
with DCR current sense.
The IR35204 also includes numerous VR design
simplifying and differentiating features, like register
diagnostics, which enable fast time-to-market.
ORDERING INFORMATION
Base Part
Number
Package Type
Standard Pack
Orderable
Part Number
Form Quantity
IR35204 40-pin, QFN 5 mm x 5 mm Tape and Reel 3000 IR35204MxxyyTRP
1
IR35204 40-pin, QFN 5 mm x 5 mm Tape and Reel 3000 IR35204MTRPBF
IR35204 40-pin, QFN 5 mm x 5 mm Tray 4900 IR35204MTYPBF
Notes:
1. Customer Specific Configuration File, where xx = Customer ID and yy = Configuration File (Codes assigned by IR Marketing).
2. IR35204 is not intended for application where ultra low power PS4 shutdown functionality is required.
