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IR3529M
A full featured and flexible way to implement power solutions for the latest high performance CPUs and ASICs.
International
TOR Rectifier IR3529
DATA SHEET
XPHASESTM PHASE IC
DESCRIPTION
The IR3529 Phase IC combined with an IR XPhase3TM Control IC provides a full featured and flexible way to
implement power solutions for the latest high performance CPUs and ASICs. The "Control" IC provides overall
system control and interfaces with anal number of "Phase" ICs which each drive and monitor a single phase of a
multiphase converter. The XPhase3T architecture results in a power supply that is smaller, less expensive, and
easier to design while providing higher efficiency than conventional approaches.
The IF13529 provides two types of current sense outputs; ILL which contains average power supply current,
information which can be used for voltage positioning and ISHARE which contains average active phase current
information since current sense amplifiers of respective phases are disabled when in power savings mode. Higher
efficiency can be expected due to increased driver capability along with reduced non-overlap durations. Turbo is
included to improve load turn-on response. A SHIFT pin now communicates to the control IC a change in phase
IC on-line status resulting in controlled phase timing during PSI and Phase Shedding. The IR3529 also
implements cycle-by-cycle over current protection to resolve high repetition rate load transients.
FEATURES
Reduced dead time
7V gate drivers (6A GATEL sink current, 4A GATEH sink current)
Turbo Mode load turn-on response enhancement
Programmable cycle-by-cycle over current limit protection
Phase status communicated to control IC for controlled phase timing during PSI and Phase Shedding
Power State Indicator (PSI) interface provides the capability to maximize the efficiency at light loads.
Anti-bias circuitry
Support converter output voltage up to 5.1 V (Limited to VCCL-1.8V)
Loss-less inductor current sensing
Phase delay DFF bypassed during PSI assertion mode to improve output ripple performance
Over-current protection during PSI assertion mode operation
Feed-forward voltage mode control
Integrated boot-strap synchronous PFET
Only four external components per phase
3 wire analog bus connects Control and Phase ICs (VID, Error Amp, Average Power Supply Current)
3 wire digital bus for accurate daisy-chain phase timing control without external components
Debugging function isolates phase IC from the converter
Self-calibration of PWM ramp, current sense amplifier, and current share amplifier
Single-wire bidirectional average current sharing
Small thermally enhanced 20L 4 X 4mm MLPQ package
RoHS compliant
Page 1 of 22 February 12, 2010
International
TOR Rectifier
APPLICATION CIRCUIT
IR3529
12v[:>
VCCL >
EAIN >
"SHARE"'-) <7; 59 t 59 ROCSET
Lu a Z. + o COCSET
n: - - Z 0
a 5 'll 8 > _ _ RCS CCS
ILL 1 ILL - sw 15 " -] _
PSI# =-2 PSI# GATEH 14 L VOUT+
oAaN=r-3 DACIN F3529 BOOST 13 ll . W <:l
1,4-'' LGND VCCL 12 CBST _
5 11 COUT =
PHSIN r- OCSET -
t 8 E D d __ CVCCL1 Cf
PHSIN D - Cl
(0 Ps co 0) O --
SHIFT [:>—l si -
PHSOUT > ___
CLKIN D— T
Figure 1 Single Phase Application Circuit
ORDERING INFORMATION
Part Number Package Order Quantity
3000 per reel
IF13529MTRPBF
20 Lead MLPQ
(4 x 4 mm body)
* IR3529MPBF
20 Lead MLPQ
(4 x 4 mm body)
100 piece strips
* Samples only
Page 2 of 22
February 12, 2010
