IR3507PBF Datasheet, PDF (1/19 Pages) International Rectifier – XPHASE3TM PHASE IC

NOT RECOMMENDED FOR NEW DESIGNS
REPLACEMENT PRODUCT – IR3507ZPBF
IR3507PbF
DATA SHEET
XPHASE3^TM PHASE IC
DESCRIPTION
The IR3507 Phase IC combined with an IR XPhase3^TM 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 any number of “Phase” ICs which each drive and monitor a single
phase of a multiphase converter. The XPhase3^TM architecture results in a power supply that is smaller, less
expensive, and easier to design while providing higher efficiency than conventional approaches.
FEATURES IR3507 PHASE IC
• Power State Indicator (PSI) interface provides the capability to maximize the efficiency at light loads.
• 7V/2A gate drivers (4A GATEL sink current)
• Converter output voltage up to 5.1 V (Limited to VCCL-1.4V)
• Loss-less inductor current sensing
• 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, IOUT)
• 3 wire digital bus for accurate daisy-chain phase timing control without external components
• Anti-bias circuitry prevents excessive sag in output voltage during PSI de-assertion
• PSI input is ignored during power up
• 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
APPLICATION CIRCUIT
12V
EAIN
IOUT
PSI
DACIN
PHSIN
PHSOUT
CLKIN
VCCL
Page 1 of 19
1 _IOUT
2 _PSI
3 _DACIN
4 _LGND
5 _PHSIN
IR3507
SW ¹⁵
GATEH ¹⁴
BOOST ¹³
VCCL ¹²
NC ¹¹
CBST
CVCCL
Figure 1 Application Circuit
IR Confidential
RCS
CCS
L
VOUT+
COUT
VOUT-
April 2, 2009