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IR3502BM-IR3502BMTRPBF
Control IC combined with an XPHASE3 IC provides a full featured and flexible way to implement a complete VR11.0 and VR11.1 power solution.
International
TOR Rectifier IR3502B
DATA SHEET
XPHASE3TM CONTROL IC
DESCRIPTION
The IR3502B control IC combined with an XPHASE3TM Phase IC provides a full featured and flexible way
to implement a complete VR11.0 and VR11.1 power solution. The IR35028 provides overall system control
and interfaces with any number of Phase ICs, each driving and monitoring a single phase. The XPhase3TM
architecture results in a power supply that is smaller, less expensive, and easier to design while providing
higher efficiency than conventional approaches.
FEATURES
1 to X phase operation with matching Phase IC
0.5% overall system set point accuracy
Daisy-chain digital phase timing provides accurate phase interleaving without external components
Programmable 250kHz to 9MHz clock oscillator frequency provides per phase switching frequency of
250kHz to 1.5MHz
Programmable Dynamic VID Slew Rate
Programmable VID Offset or No Offset
Programmable Load Line Output Impedance
High speed error amplifier with wide bandwidth of 30MHz and fast slew rate of 10V/us
Programmable constant converter output current limit during soft start
Hiccup over current protection with delay during normal operation
Central over voltage detection and latch with programmable threshold and communication to phase ICs
Over voltage signal output to system with overvoltage detection during powerup and normal operation
Load current reporting
Single NTC thermistor compensation for correct current reporting, OC Threshold, and Droop
Detection and protection of open remote sense line
Open control loop protection
IC bias linear regulator controller
Programmable VRHOT function monitors temperature of power stage through a NTC thermistor
Remote sense amplifier with true converter voltage sensing
Small thermally enhanced 32L 5mm x 5mm MLPQ package
RoHS Compliant
ORDERING INFORMATION
Device Package Order Quantity
32 Lead MLPQ
IR3502BMTRPBF (5 x 5 mm body)
32 Lead MLPQ
(5 x 5 mm body)
3000 per reel
* IR3502BMPBF 100 piece strips
. Samples only
Page 1 of 38 V3.2
International
TOR Rectifier IR3502B
APPLICATION CIRCUIT
+12V 12V
PH SIN
PGOOD PH sour
IOUT C LKDUT
VID o a GND
> ROSC
VIDG ROSC
VID5 SSIDEL CSS/DEL
VID4 VIDA VDAC
IR3502 B RVSEfPr CVDAC
VID3 VSETPT VDAC
RTCMFB
VID2 VDAC_BUFF
I/IDI VN
VIDO F-
ENABLE
RHOTSETI
VOSEN+
VOSEN-
Figure 1: IR3502B Application Circuit
IR3502B AMPLIFIER
VDAC EAOUT lk
BUFFER
AMPLIFIER
DAC RVDAC
--AVe--a
OCSET ROCSET
- ( l' IOCSET
IVDAC IVSETPT CVDAC
IPOSC IFOSC i-
_ ROSC BUFFER
CURRENT AMPLIFIER 0.6V
SOURCE LGND
IROSC GENERATOR ' I _]
ROSC ROSC
-M4---e
REMOTE SENSE SYSTEM
AMPLIFIER SET POINT
OSEN+ VOLTAGE
OSEN- ’p
Figure 2 -System-set point measurements.
Page 2 of 38 V3.2
