6+1 Dual Output Digital Multi-Phase Controller
IR35203
www.irf.com | © 2016 International Rectifier February 8, 2016 | V1.5
1
FEATURES
Ultra Low Quiescent Power Dual output 6+1 phase
PWM Controller
Intel®VR12 Rev 1.7, VR12.5 Rev 1.5, IMVP8 Rev
1.2, 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; -40oC to 85oC ambient
operation; -40oC to 125oC junction
Pb-Free, RoHS, 6x6mm 48-pin, 0.4mm pitch QFN
APPLICATIONS
Intel® VR12, VR12.5 and IMVP8 (overclocking only)
based systems
Servers and High End Desktop CPU VRs
High Performance Graphics Processors, Memory VR
DESCRIPTION
The IR35203 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, IMVP82Rev 1.2
specifications.
The IR35203 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 IR35203 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.
IR35203 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 IR35203 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 IR35203 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
IR35203 48-pin, QFN 6 mm x 6 mm Tape and Reel 3000 IR35203MxxyyTRP1
IR35203 48-pin, QFN 6 mm x 6 mm Tape and Reel 3000 IR35203MTRPBF
IR35203 48-pin, QFN 6 mm x 6 mm Tray 4900 IR35203MTYPBF
Notes:
1. Customer Specific Configuration File, where xx = Customer ID and yy = Configuration File (Codes assigned by IR Marketing).
2. IR35203 is not intended for application where ultra low power PS4 shutdown functionality is required.
6+1 Dual Output Digital Multi-Phase Controller
IR35203
www.irf.com | © 2016 International Rectifier February 8, 2016 | V1.5
2
ORDERING INFORMATION
IR35203M
32
30
26
31
29
27
25
4547 4248 4446 4143 40 39
20 21
1513 181614 1917
1
7
5
3
9
2
4
6
8
10
VRTN
RCSM
VSEN
CFILT
RCSP
I_IN
PWM2
TSEN1
VRTN_L2
EN_L2/
CAT_FLT PWM3
PWM5
PWM4
VSEN_L2
VRDY2
PWM6
VCC
ISEN1_L2
28
49 GND
IR35203 6+1
48 Pin 6x6 QFN
Top View
11
12
23 24
22
35
34
33
38 37
ISEN6
VRDY1
VINSEN
RCSM_L2
RCSP_L2
36
PWM1_L2
Figure 1: IR35203 Pin Diagram
P/PBF
– Lead Free
TR – Tape & Reel / TY - Tray
yy – Configuration File ID
xx – Customer ID
Package Type (QFN)
