IR3527 Datasheet, PDF (1/20 Pages) International Rectifier – XPHASE3TM DUAL PHASE IC

IR3527
DATA SHEET
XPHASE3^TM DUAL PHASE IC
DESCRIPTION
The IR3527 Dual Phase IC combined with an IR XPhase3^TM Control IC provides a full featured and flexible
way to implement multiphase power solutions. The Control IC provides overall system control and interfaces
with any number of IR3527 Phase ICs which each drive and monitor 2 phases of a Synchronous Buck
converter.
The IR3527 implement an independent power savings function for each power stage and sequential phase
timing for use in single output multiphase converters. When power saving mode is enabled, the power stage
will disable its output thus eliminating its switching loss while proper converter operation is maintained by the
single power stage or in conjunction with other converter power stages. The IR3527 current sense amplifiers
remain active when in power savings to support adaptive voltage positioning.
FEATURES
x 7V/1.3A gate drivers (2.6A GATEL sink current)
x Converter output voltage up to 5.1 V (Limited to VCCL-1.4V)
x Loss-less inductor current sensing
x Feed-forward voltage mode control
x Integrated boot-strap synchronous PFET
x Self-calibration of PWM ramp, current sense amplifier, and current share amplifier
x Single-wire bidirectional average current sharing
x Only three external components per phase, plus common decoupling capacitors
x Power State Indicator (PSI) interface provides the capability to maximize the efficiency at light loads.
x Debugging function isolates phase from the converter
x Small thermally enhanced 24L 4 x 4mm MLPQ package
x RoHS compliant
VIN (12V)
CCS1
RCS1
CCS2
RCS2
3 Wire
Analog
Bus
Power
Savings
Control
3 Wire
Digital
Phase
Timing
IC Bias
(7V)
Page 1 of 20
1
CSIN1+
CBST2
L2
18
BOOST2
2 _EAIN
VCCL2 ¹⁷
3
ISHARE
4 _DACIN
IR3527 DUAL
PHASE IC
16
GATEL2
PGND ¹⁵
5 _PSI1
GATEL1 ¹⁴
6 _PSI2
VCCL1 ¹³
L1
CBST1
CVCCL
Figure 1 – IR3527 Application Circuit
VOUT+
C OU T
VOUT-
CIN
‘
V3.0