Digital Multi-Phase Buck Controller
FEATURES
6-phase & 8-phase dual output PWM Controller
Phases are flexibly assigned between Loops 1 & 2
Intel® VR12, AMD® 3.4MHz SVI/PVI & Memory
modes
Overclocking & Gaming Mode with Vmax setting
Switching frequency from 200kHz to 1.2MHz per
phase
IR Efficiency Shaping Features including Variable
Gate Drive and Dynamic Phase Control
Programmable 1-phase or 2-phase 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, CFP
I2C/SMBus/PMBus system interface for telemetry
of Temperature, Voltage, Current & Power for
both loops
Non-Volatile Memory (NVM) for custom
configuration
Compatible with IR ATL and 3.3V Tri-state Drivers
+3.3V supply voltage; -20ºC to 85ºC ambient
operation
Pb-Free, RoHS, 7x7 48-pin & 8x8 56-pin QFN, MSL2
package
IR3536A
IR3538A
DESCRIPTION
The IR3536A and IR3538A are dual-loop digital multi-phase
buck controllers. The IR3536A drive up to 6 phases and the
IR3538A drives up to 8 phases. The IR3536A and IR3538A
are fully Intel® VR12 and AMD® SVI/PVI compliant on both
loops and provide a Vtt tracking function for DDR memory.
The IR3536A and IR3538A include the IR Efficiency
Shaping Technology to deliver exceptional efficiency at
minimum cost across the entire load range.
IR Variable Gate Drive optimizes the MOSFET gate drive
voltage based on real-time load current. IR Dynamic Phase
Control adds/drops phases based upon load current.
The IR3536A and IR3538A can be configured to enter 1-
phase 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.
The I2C/PMBus interface can communicate with up to 16
IR3536A and IR3538A based VR loops. Device
configuration and fault parameters are easily defined using
the IR Intuitive Power Designer (DPDC) GUI
and stored in on-chip NVM.
The IR3536A and IR3538A provides extensive OVP, UVP,
OCP and OTP fault protection and includes thermistor
based temperature sensing with VR_HOT signal.
NVM storage saves pins and enables a small package size.
The IR3536A and IR3538A also include numerous features
like register diagnostics for fast design cycles and platform
differentiation, truly simplifying
VRD design and enabling fastest time-to-market with its
“set-and-forget” methodology.
APPLICATIONS
Intel ® VR12 & AMD® SVI & PVI based systems
DDR Memory with Vtt tracking
Overclocked & Gaming platforms
PIN DIAGRAM
Figure 1: IR3536A Package Top View
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June 21, 2013 | FINAL | V1.09
Figure 2: IR3538A Package Top View
Digital Multi-Phase Buck Controller
ORDERING INFORMATION
IR353
AM
Package
P/PBF
– Lead Free
TR
– Tape & Reel /
TY
- Tray
yy
– Configuration File ID
xx
– Customer ID
Package Type (QFN)
Part –
6:
IR3536A
8:
IR3538A
QFN
QFN
QFN
QFN
Packing
Qty
TR=3000
TY=2600
TR=3000
TY=2600
TR=3000
TR=3000
IR3536A
IR3538A
Part Number
IR3536AMTRPBF
IR3536AMTYPBF
IR3538AMTRPBF
IR3538AMTYPBF
IR3536AMxxyyTRP
1
Programming
Default
Default
Customer Configuration
Customer Configuration
IR3538AMxxyyTRP
1
Notes:
1.
Customer Specific Configuration File, where
xx = Customer ID and yy = Configuration File
(Codes assigned by IR Marketing).
Figure 3: IR3536A Package Top View, Enlarged
Figure 4: IR3538A Package Top View, Enlarged
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June 21, 2013 | FINAL | V1.09
Digital Multi-Phase Buck Controller
FUNCTIONAL BLOCK DIAGRAM
V18A
RCSP_L2
RSCM_L2
AFE_2
VSEN_L2
VRTN_L2
VCC
VID_2
1.8V
LDO
IR3536A
IR3538A
ITOT_2
RCSP
RSCM
AFE_1
VSEN
VRTN
VID_1
Voltage
ADC
Vout1_Error
PWM1
Vout2_Error
PWM2
PWM3
ISEN1
Mode Control
IRTN1
.
.
.
ISENx
IRTNx
IR3536/
IR3538/
CHL8326
CHL8328
CHL8326
x
3
4
y
4
5
z
6
8
PWM4
.
.
.
IP1
.
.
.
IPx
Control
and
Monitoring
PWM Generator
PWM5
Phase_
Period_1
Phase_
Period_2
PWM6
Σ
ITOT_1
PWM7
Only for
CHL8328
IR3538A
PWM8
Iout
ISENy
IRTNy
.
.
.
ISENz
IRTNz
IP1
.
.
.
IP6
Only for
IR3538/
CHL8328
IP7
.
.
.
IP8
.
.
.
IPy
.
.
.
IPz
ITOT_2
Vin
Vout
Temp
Current ADC
VAR_GATE
Σ
Fault Bus
System Clock
System Clock
ADC Clocks
MUX Clocks
Phase_Period_1
1
2
Intel/MPoL mode
AMD mode
TSEN2
TSEN
VINSEN
V3_3
EN
SV_CLK /SVC_VID[3]
SV_DIO
1
/SVD_VID[2]
2
SV_ALERT#
1
/VID[4]
2
SMB_DIO
SMB_CLK
SMB_ALERT
PSI
1
/VID[5]
2
SV_ADDR
1
/VID[1]
2
PM_ADDR
1
/
PM_ADDR_VID[0]
2
1
2
Phase_Period_2
VID_1
VID_2
Monitor ADC
Reference,
Oscillator,
State Control,
Interfaces,
Registers and
NVM
Iout
Vin
Temp
Fault Bus
VR_HOT#
1
/
VRHOT_ICRIT#
2
VR_READY
1
/PWRGD
2
VR_READY_L2
1
/
PWROK
2
GPO_A
Only for
GPO_B
CHL8328
IR3538A
CFP
1
/VFIXEN_PSI
2
RRES
Figure 5: IR3536A / IR3538A Functional Block Diagram
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June 21, 2013 | FINAL | V1.09
