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IR35211 Schematic ( PDF Datasheet ) - International Rectifier

Teilenummer IR35211
Beschreibung Dual Output Digital Multi-Phase Controller
Hersteller International Rectifier
Logo International Rectifier Logo 




Gesamt 30 Seiten
IR35211 Datasheet, Funktion
  Dual Output Digital Multi-Phase Controller IR35211
FEATURES
Dual output 3+1 phase PWM Controller
Easiest layout and fewest pins in the industry
Fully supports AMD® SVI1 & SVI2 with dual
OCP and Intel® VR12 & VR12.5
Overclocking & Gaming Mode
Switching frequency from 200kHz to 2MHz
per phase
IR Efficiency Shaping Features including
Dynamic Phase Control and Automatic Power
State Switching
Programmable 1-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 auto-
compensation
Per-Loop Fault Protection: OVP, UVP, OCP,
OTP
I2C/SMBus/PMBus system interface for
telemetry of Temperature, Voltage, Current &
Power for both loops
Multiple Time Programming (MTP) with
integrated charge pump for easy custom
configuration
Compatible with IR ATL and 3.3V tri-state
Drivers
+3.3V supply voltage; -40°C to 85°C ambient
operation
Pb-Free, Halogen Free, RoHS, 6x6mm,
40-pin, 0.5 mm pitch QFN
DESCRIPTION
The IR35211 is a dual loop digital multi-phase buck
controller designed for CPU voltage regulation and is fully
compliant to AMD® SVI1 & SVI2 Rev 1.2 & Intel© VR12
Rev 1.5 PWM specification and VR12.5 Rev 1.3 PWM
specification.
The IR35211 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 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 Digital Power
Design Center (DPDC) GUI and stored in on-chip MTP.
The IR35211 provides extensive OVP, UVP, OCP and
OTP fault protection and includes thermistor based
temperature sensing with VRHOT signal.
The IR35211 includes numerous features like register
diagnostics for fast design cycles and platform
differentiation, simplifying VRD design and enabling
fastest time-to-market (TTM) with “set-and-forget”
methodology.
APPLICATIONS
AMD® SVI1 & SVI2, Intel® VR12 & VR12.5 based
systems
Desktop & Notebook CPU VRs
High Performance Graphics Processors
ORDERING INFORMATION
Base Part
Number
IR35211
Package Type
QFN 6 mm x 6 mm
Standard Pack
Form
Quantity
Tape and Reel
3000
Orderable
Part Number
IR35211MxxyyTRP1
IR35211
QFN 6 mm x 6 mm
Tape and Reel
3000
IR35211MTRPBF
IR35211
QFN 6 mm x 6 mm
Tray
4900
IR35211MTYPBF
Notes 1: Customer Specific Configuration File, where xx = Customer ID and yy = Configuration File (Codes assigned by IR Marketing).
 
  1 www.irf.com   |  © 2014 International Rectifier
July 24, 2014  |  V1.00






IR35211 Datasheet, Funktion
  Dual Output Digital Multi-Phase Controller IR35211
20
21
22
23 - 25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41 (PAD)
SM_CLK
NC
TSEN2/
VAUXSEN
PWM1 – PWM3
PWM1_L2
VRTN_L2
VSEN_L2
VCC
RCSM_L2
RCSP_L2
ISEN 1_L2
IRTN 1_L2
NC
ISEN 3
IRTN 3
ISEN 2
IRTN 2
ISEN 1
IRTN 1
GND
D [I]
A [O]/
A [I]
A [O]
A [O]
A [I]
A [I]
A [I]
A [I]
A [I]
A [I]
A [I]
A [I]
A [I]
A [I]
A [I]
A [I]
A [I]
Serial Clock Input. I2C/SMBus/PMBUS serial clock line. Interface is rated to 1 MHz.
Do Not Connect.
Auxiliary Voltage Sense Input. As Auxiliary Voltage Sense, it monitors an additional power
supply to ensure that both the IR35211 Vcc and other voltages (such as VCC to the driver) are
operational.
NTC Temerature Sense Input Loop #2. An NTC network is connected to this pin to measure
temperature for VRHOT. Refer to page 44 for details.
Phase 1-3 Pulse Width Modulation Outputs. PWM signal pin which is connected to the input of
an external MOSFET gate driver. Refer to page 33 section for unused/disabled phases. The
power-up state is high-impedance until ENABLE goes active.
Loop 2 Pulse Width Modulation Outputs. PWM signal pin which is connected to the input of an
external MOSFET gate driver. Refer to page 33 section for unused/disabled phases. The power-
up state is high-impedance until ENABLE goes active.
Voltage Sense Return Input Loop#2. This pin is connected directly to Loop#2 ground at the
load and should be routed differentially with VSEN_L2.
Voltage Sense Input Loop#2. This pin is connected directly to the VR output voltage of Loop #2
at the load and should be routed differentially with VRTN_L2.
Input Supply Voltage. 3.3V supply to power the device.
Resistor Current Sense Minus Loop#2. This pin is connected to an external network to set the
load line slope, bandwidth and temperature compensation for Loop #2.
Resistor Current Sense Positive Loop#2. This pin is connected to an external network to set
the load line slope, bandwidth and temperature compensation for Loop #2.
Loop 2 Phase 1 Current Sense Input. Loop 2 Phase 1 sensed current input (+). Short to pin 38
if not used.
Loop 2 Phase 1 Current Sense Return Input. Loop 2 Phase 1 sensed current input return (-).
Short to pin 37 if not used.
Do Not Connect.
Phase 3 Current Sense Input. Phase 3 sensed current input (+). Short to pin 44 if not used.
Phase 3 Current Sense Return Input. Phase 3 sensed current input return (-). Short to pin 43 if
not used.
Phase 2 Current Sense Input. Phase 2 sensed current input (+). Short to pin 46 if not used.
Phase 2 Current Sense Return Input. Phase 2 sensed current input return (-). Short to pin 45 if
not used.
Phase 1 Current Sense Input. Phase 1 sensed current input (+)
Phase 1 Current Sense Return Input. Phase 1 sensed current input return (-)
Ground. Ground reference for the IC. The large metal pad on the bottom must be connected to
Ground.
Note 1: A - Analog; D – Digital; [I] – Input; [O] – Output; [B] – Bi-directional; [P] - Power
  6 www.irf.com   |  © 2014 International Rectifier
July 24, 2014  |  V1.00

6 Page









IR35211 pdf, datenblatt
  Dual Output Digital Multi-Phase Controller IR35211
GENERAL DESCRIPTION
The IR35211 is a flexible, dual-loop, digital multiphase
PWM buck controller optimized to convert a 12V input
supply to the core voltage required by Intel and AMD
high performance microprocessors and DDR memory.
It is easily configurable for 1-3 phase operation on
Loop #1 and 0-1 phase operation on Loop #2.
The unique partitioning of analog and digital circuits
within the IR35211 provides the user with easy
configuration capability while maintaining the required
accuracy and performance. Access to on-chip Multiple
Time Programming memory (MTP) to store the
IR35211 configuration parameters enables power
supply designers to optimize their designs without
changing external components.
The IR35211 controls two independent output
voltages. Each voltage is controlled in an identical
fashion, so that the user can configure and optimize
each control loop individually. Unless otherwise
described, the following functions are performed on
the IR35211 on each control loop independently.
OPERATING MODES
The IR35211 can be used for Intel VR12/12.5, AMD
SVI1/SVI2, DDR Memory and GPU designs without
significant changes to the external components (Bill of
Materials). The required mode is selected in MTP and
the pin-out, VID table and relevant functions are
automatically configured. This greatly reduces time-to-
market and eliminates the need to manage and
inventory 6 different PWM controllers.
DIGITAL CONTROLLER & PWM
A linear Proportional-Integral-Derivative (PID) digital
controller provides the loop compensation for system
regulation. The digitized error voltage from the high-
speed voltage error ADC is processed by the digital
compensator. The digital PWM generator uses the
outputs of the PID and the phase current balance
control signals to determine the pulse width for each
phase on each loop. The PWM generator has enough
resolution to ensure that there are no limit cycles. The
compensator coefficients are user configurable to
enable optimized system response. The compen-
sation algorithm uses a PID with two additional
programmable poles. This provides the digital
equivalent of a Type III analog compensator.
ADAPTIVE TRANSIENT ALGORITHM (ATA)
Dynamic load step-up and load step-down transients
require fast system response to maintain the output
voltage within specification limits. This is achieved by
a unique adaptive non-linear digital transient control
loop based on a proprietary algorithm.
MULTIPLE TIME PROGRAMMING MEMORY
The multiple time programming memory (MTP) stores
the device configuration. At power-up, MTP contents
are transferred to operating registers for access
during device operation. MTP allows customization
during both design and high-volume manufacturing.
MTP integrity is verified by cyclic redundancy code
(CRC) checking on each power up. The controller will
not start in the event of a CRC error.
The IR35211 offers up to 8 writes to configure basic
device parameters such as frequency, fault operation
characteristics, and boot voltage. This represents a
significant size and component saving compared to
traditional analog methods. The following pseudo-
code illustrates how to write the MTP:
# write data
Set MTP Command Register = WRITE,
Line Pointer = An unused line
Poll MTP Command Register until Operation = IDLE.
# verify data was written correctly
Issue a READ Command; then poll OTP Operation Register
till Operation = IDLE
Verify that the Read Succeeded
INTERNAL OSCILLATOR
The IR35211 has a single 96MHz internal oscillator
that generates all the internal system clock
frequencies required for proper device function.
The oscillator frequency is factory trimmed for
precision and has extremely low jitter (Figure 4) even
in light-load mode (Figure 5). The single internal
oscillator is used to set the same switching frequency
on each loop.
  12 www.irf.com   |  © 2014 International Rectifier
July 24, 2014  |  V1.00

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