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International Rectifier Electronic Components Datasheet

IR3527 Datasheet

Dual Phase

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IR3527
DATA SHEET
XPHASE3TM DUAL PHASE IC
DESCRIPTION
The IR3527 Dual Phase IC combined with an IR XPhase3TM 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)
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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+
2 EAIN
3 ISHARE
4 DACIN
5 PSI1
6 PSI2
IR3527 DUAL
PHASE IC
BOOST2
VCCL2
GATEL2
PGND
GATEL1
VCCL1
18
17
16
15
14
13
CBST2
CBST1
L2
L1
CVCCL
Figure 1 – IR3527 Application Circuit
VOUT+
C OU T
VOUT-
CIN
V3.0


International Rectifier Electronic Components Datasheet

IR3527 Datasheet

Dual Phase

No Preview Available !

ORDERING INFORMATION
Part Number
IR3527MTRPBF
* IR3527MPBF
* Samples only
Package
24 Lead MLPQ
(4 x 4 mm body)
24 Lead MLPQ
(4 x 4 mm body)
IR3527
Order Quantity
3000 per reel
100 piece strips
PIN DESCRIPTION
PIN#
1
2
3
PIN
SYMBOL
CSIN1+
EAIN
ISHARE
4
5
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6
7
8
9
10
11
12
13
14
15
16
17
18
DACIN
PSI1
PSI2
PHSIN
PHSOUT
CLKIN
SW1
GATEH1
BOOST1
VCCL1
GATEL1
PGND
GATEL2
VCCL2
BOOST2
Page 2 of 20
PIN DESCRIPTION
Phase1 current sense amplifier non-inverting input and input to debug comparator
PWM comparator input from the error amplifier output of Control IC. Body Braking
mode is initiated if the voltage on this pin is less than V(DACIN) threshold.
Output of the Current Sense Amplifiers are connected to this pin through 3kŸ
resistors. Voltage on this pin is equal to approximately V(DACIN) + 16 [(VCSIN1+
VCSIN1-) + (VCSIN2+ – VCSIN2-)]. Connecting all Phase IC ISHARE pins together creates
a share bus which provides an indication of the average current being supplied by all
the phases. The signal is used by the Control IC for voltage positioning, over-current
protection, and in some cases current reporting. OVP mode is initiated if the voltage
on this pin rises above V(VCCL)- 0.8V.
Reference voltage input from the Control IC. The Current Sense signal and PWM
ramps are referenced to the voltage on this pin.
Input to Phase 1 PSI comparator. Logic low stops the phase from switching (low =
low power state)
Input to Phase 2 PSI comparator. Logic low stops the phase from switching (low =
low power state)
Phase timing clock input.
Phase timing clock output.
Clock input.
Return for Phase1 high-side driver and reference for GATEL1 non-overlap
comparator.
Phase1 High-side driver output and input to GATEL1 non-overlap comparator.
Supply for Phase1 high-side driver. Internal bootstrap synchronous PFET is
connected between this pin and the VCCL1 pin.
Supply for Phase1 low-side driver. Internal bootstrap synchronous PFET is
connected from this pin to the BOOST1 pin.
Phase1 Low-side driver output and input to GATEH1 non-overlap comparator.
Return for low side drivers and reference for GATEH non-overlap comparators.
Phase2 Low-side driver output and input to GATEH2 non-overlap comparator.
Supply for Phase2 low-side driver. Internal bootstrap synchronous PFET is
connected from this pin to the BOOST pin.
Supply for Phase2 high-side driver. Internal bootstrap synchronous PFET is
connected between this pin and the VCCL1 pin.
V3.0


Part Number IR3527
Description Dual Phase
Maker International Rectifier
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IR3527 Datasheet PDF






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