IR3087PBF
DATA SHEET
XPHASE
TM
PHASE IC WITH
OPTI-PHASE
TM
, OVP, AND OVERTEMP DETECT
DESCRIPTION
The IR3087 Phase IC combined with an IR
XPhase
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 XPhase
TM
architecture results in a power supply that is smaller, less
expensive, and easier to design while providing higher efficiency than conventional approaches.
The IR3087 with
Opti-Phase
TM
is intended for applications demanding increased efficiency under medium to
light load conditions. Both gate drivers will drive low at a programmable output current threshold. This
effectively disconnects the phase from the load eliminating power losses due to switching and circulating
currents.
FEATURES
•
•
•
•
•
•
•
•
•
•
•
•
•
2.5A Average Gate Drive Current
Loss-Less Inductor Current Sense
Internal Inductor DCR Temperature Compensation
Programmable Phase Delay
Programmable Feed-Forward Voltage Mode PWM Ramp
Sub 100ns Minimum Pulse Width supports 1MHz per-phase operation
Current Sense Amplifier drives a single wire Average Current Share Bus
Current Share Amplifier reduces PWM Ramp slope to ensure sharing between phases
Body Braking
TM
disables Synchronous MOSFET for improved transient response and prevents negative
output voltage at converter turn-off
Opti-Phase
TM
reduces the number of phases for improved light to medium load efficiency
OVP comparator with 150ns response
Programmable Phase Over-Temperature Detection
Small thermally enhanced 20L MLPQ package
APPLICATION CIRCUIT
VGATE
12V
VRHOT
DAC
RBIASIN
20k
20
19
18
17
ROP1
ROP2
RCS-
CCS+
CCS-
RCS+
16
BIAS
RPHASE1
DBST
OPTIPHS
BIASIN
DACIN
CSIN+
CSIN-
CBST
CIN
1
5 Wire Analog Bus
From Control IC
RMPIN+
RMPIN-
HOTSET
VRHOT
ISHARE
SCOMP
EAIN
VCCH
GATEH
PGND
GATEL
VCCL
LGND
VCC
15
14
13
12
11
L
RAMP
2
3
4
IR3087
PHASE
IC
PWMRMP
VO
CO
ISHARE
RPHASE2
5
CVCCL
RVCC
RPWMRMP
6
7
8
9
CSCOMP
CPWMRMP
EA
RPHASE3
10
CVCC
Page 1 of 35
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/31/05
IR3087PBF
ORDERING INFORMATION
Device
IR3087MTRPbF
IR3087MPbF
Order Quantity
3000 per reel
100 piece strips
ABSOLUTE MAXIMUM RATINGS
Operating Junction Temperature……………..150
o
C
Storage Temperature Range………………….-65
o
C to 150
o
C
ESD Rating……………………………………..HBM Class 1C JEDEC standard
PIN #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
PIN NAME
RMPIN+
RMPIN-
HOTSET
VRHOT
ISHARE
SCOMP
EAIN
PWMRMP
LGND
VCC
VCCL
GATEL
PGND
GATEH
VCCH
CSIN+
CSIN-
OPTIPHS
DACIN
BIASIN
V
MAX
20V
20V
20V
20V
20V
20V
20V
20V
n/a
24V
27V
27V
0.3V
30V
30V
20V
20V
20V
20V
20V
V
MIN
-0.3V
-0.3V
-0.3V
-0.3V
-0.3V
-0.3V
-0.3V
-0.3V
n/a
-0.3V
-0.3V
-0.3V DC, -2V for
100ns
-0.3V
-0.3V DC, -2V for
100ns
-0.3V
-0.3V
-0.3V
-0.3V
-0.3V
-0.3V
I
SOURCE
1mA
1mA
1mA
1mA
5mA
1mA
1mA
1mA
50mA
n/a
n/a
3A for 100ns,
200mA DC
3A for 100ns,
200mA DC
3A for 100ns,
200mA DC
n/a
1mA
1mA
1mA
1mA
1mA
I
SINK
1mA
1mA
1mA
30mA
5mA
1mA
1mA
20mA
n/a
50mA
3A for 100ns,
200mA DC
3A for 100ns,
200mA DC
n/a
3A for 100ns,
200mA DC
3A for 100ns,
200mA DC
1mA
1mA
1mA
1mA
1mA
Page 2 of 35
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/31/05
IR3087PBF
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, these specifications apply over: 8.4V
≤
V
CC
≤
21V, 6V
≤
V
CCH
≤
28V, 6V
≤
V
CCL
≤
14V, and 0
o
C
≤
T
J
≤
125
o
C, C
GATEH
= 3.3nF, C
GATEL
= 6.8nF
PARAMETER
Gate Drivers
GATEH Rise Time
GATEH Fall Time
GATEL Rise Time
GATEL Fall Time
GATEL low to GATEH high
delay
GATEH low to GATEL high
delay
Disable Pull-Down Current
Current Sense Amplifier
CSIN+ Bias Current
CSIN- Bias Current
Input Offset Voltage
Gain at T
J
= 25
o
C
Gain at T
J
= 125
o
C
Slew Rate
TEST CONDITION
VCCH = 12V, Measure 2V to 9V
transition time
VCCH = 12V, Measure 9V to 2V
transition time
VCCL = 12V, Measure 2V to 9V
transition time
VCCL = 12V, Measure 9V to 2V
transition time
VCCH = VCCL = 12V, Measure the time
from GATEL falling to 1V to GATEH
rising to 1V
VCCH = VCCL = 12V, Measure the time
from GATEH falling to 1V to GATEL
rising to 1V
Force GATEH or GATEL = 2V with
BIASIN = 0V
MIN
TYP
22
22
50
50
MAX
50
50
75
75
50
UNIT
ns
ns
ns
ns
ns
10
25
10
25
50
ns
15
25
40
µA
CSIN+ = CSIN- = DACIN. Measure
input referred offset from DACIN
-0.5
-1
-3
32
27
-0.25
-0.4
0.5
34
29
12.5
0
0
5
36
31
µA
µA
mV
V/V
V/V
V/µs
Current Sense Amplifier output is an
internal node. Slew rate at the ISHARE
pin will be set by the internal 10kΩ
resistor and any stray external
capacitance
-20
0
7.9
9.3
Force I(PWMRMP) = 500µA. Measure
V(PWMRMP) – V(DACIN)
-10
4
Differential Input Range
Common Mode Input Range
Rout at T
J
= 25
o
C
Rout at T
J
= 125
o
C
Ramp Discharge Clamp
Clamp Voltage
Clamp Discharge Current
10.5
12.4
5
8
100
4
13.1
15.5
20
mV
V
kΩ
kΩ
mV
mA
Page 3 of 35
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/31/05
IR3087PBF
PARAMETER
Ramp Comparator
Input Offset Voltage
Hysteresis
RMPIN+, RMPIN- Bias
Current
Propagation Delay
TEST CONDITION
MIN
20
-10
-1
100
TYP
40
0
0
150
MAX
80
10
1
240
UNIT
mV
mV
µA
ns
Note 1
VCCH = 12V. Measure time from
RMPIN input (50mV overdrive) to
GATEL transition to <11V.
PWM Comparator
PWM Comparator Input Offset
Voltage
EAIN & PWMRMP Bias
Current
Propagation Delay
-5
Clamp and Current Share Adjust OFF
VCCH = 12V. Measure time from
PWMRMP input (50mV overdrive) to
GATEH transition to < 11V.
Exceeding the Common Mode input
range results in 100% duty cycle
10
-3.5
4
0.9
20
60
-1
5
-0.4
70
15
1
150
mV
µA
ns
Common Mode Input Range
Share Adjust Error Amplifier
Input Offset Voltage
Input Voltage Range
PWMRMP Adjust Current
Transconductance
SCOMP Source/Sink Current
SCOMP Activation Voltage
5
V
20
8
1.6
30
150
EAIN – PWMRMP, Note 1
I(PWMRMP) = 3.5mA, Note 1
Note 1
Amount SCOMP must increase from its
minimum voltage until the Ramp Slope
Adjust current equals = 10µA
I(PWMRMP) = 500µA
Compare to V(DACIN)
VCCL = 12V. Measure time from EAIN
< 0.9 x V(DACIN) (200mV overdrive) to
GATEL transition to < 11V. Note 1.
VDACIN = 0.8V,
VDACIN = 0.8V,
VDACIN = 0.8V,
VDACIN = 1.2V,
VDACIN = 1.2V,
VDACIN = 1.2V,
VDACIN = 1.6V,
VDACIN = 1.6V,
VDACIN = 1.6V,
V(OPTIPHS) = 0.25V
V(OPTIPHS) = 1.0V
V(OPTIPHS) = 2.0V
V(OPTIPHS) = 0.25V
V(OPTIPHS) = 1.0V
V(OPTIPHS) = 2.0V
V(OPTIPHS) = 0.25V
V(OPTIPHS) = 1.0V
V(OPTIPHS) = 2.0V
30
3.5
2.3
40
300
mV
V
mA
A/V
µA
mV
PWMRMP Min Voltage
0% Duty Cycle Comparator
Threshold Voltage
Propagation Delay
Opti-Phase
TM
Comparator
Threshold Voltage
Threshold Voltage
Threshold Voltage
Threshold Voltage
Threshold Voltage
Threshold Voltage
Threshold Voltage
Threshold Voltage
Threshold Voltage
Propagation Delay
OPTIPHS Bias Current
Disable Comparator Threshold
150
86
225
88
100
350
92
150
mV
%
ns
-5
-55
-135
-10
-55
-130
-15
-50
-125
-1
100
V(BIASIN) – V(OPTIPHS)
35
10
-25
45
25
0
50
40
10
200
-0.2
400
75
90
105
90
105
135
115
120
155
1
750
mV
mV
mV
mV
mV
mV
mV
mV
mV
ns
µA
mV
Page 4 of 35
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/31/05
IR3087PBF
PARAMETER
OVP Comparator
Threshold Voltage
Propagation Delay
TEST CONDITION
Compare to V(DACIN)
VCCL = 12V. Measure time from CSIN
> V(DACIN) (200mV overdrive) to
GATEL transition to <11V.
MIN
100
TYP
125
150
MAX
160
250
UNIT
mV
ns
General
VCC Supply Current
VCCL Supply Current
VCCH Supply Current
BIASIN Bias Current
DACIN Bias Current
VRHOT Comparator
HOTSET Bias Current
Output Voltage
VRHOT Leakage Current
Threshold Hysteresis
Threshold Voltage
4V
≤
V
CCH
≤
14V
14V
≤
V
CCH
≤
28V
-5
-2
-6
I(VRHOT) = 29mA
V(VRHOT) = 5.5V
T
J
≥
85
o
C
T
J
≥
85 C
o
10
2.5
5.5
6.5
-2.5
-1
-4
300
0
7.0
14
5
8
10
2
1
mA
mA
mA
mA
µA
µA
µA
mV
µA
o
C
V
3.0
TYP
4.73mV/
o
C x
T
J
+ 1.46V
MIN
4.73mV/
o
C x T
J
+ 1.36V
-2
400
10
11.0
MAX
4.73mV/
o
C x
T
J
+ 1.56V
Note 1:
Guaranteed by design, but not tested in production
Page 5 of 35
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/31/05
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