IR3508
DATA SHEET
XPHASE3
TM
PHASE IC
DESCRIPTION
The IR3508 Phase IC combined with any IR
XPhase3
Control IC provides a full featured and flexible way to
implement a power solution 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
TM
phase of a multiphase converter. The
XPhase3
architecture results in a power supply that is smaller, less
expensive, and easier to design while providing higher efficiency than conventional approaches.
The IR3508 disables its current sense amplifiers when entering power savings mode. The recommended use
for these Phase ICs is for applications without adaptive voltage positioning where two or more power stages
will be operating in power savings mode.
TM
FEATURES IR3508 PHASE IC
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
Power State Indicator (PSI) interface provides the capability to maximize the efficiency at light loads.
Anti-bias circuitry
7V/2A gate drivers (4A GATEL sink current)
Support converter output voltage up to 5.1 V (Limited to VCCL-1.4V)
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, IOUT)
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
APPLICATION CIRCUIT
12V
EAIN
19
20
18
CSIN+
CSIN-
EAIN
17
VCC
NC
16
RCS
SW
15
14
13
12
11
CBST
L
CCS
IOUT
PSI
DACIN
1
2
3
4
5
IOUT
PSI
DACIN
LGND
PHSOUT
GATEL
PHSIN
NC
CLKIN
PGND
GATEH
VOUT+
IR3508
BOOST
VCCL
NC
COUT
VOUT-
7
6
8
9
PHSIN
PHSOUT
CLKIN
CVCCL
VCCL
Figure 1 Application Circuit
Page 1 of 19
October 27, 2008
10
IR3508
ORDERING INFORMATION
Part Number
IR3508MTRPBF
* IR3508MPBF
* Samples only
Package
20 Lead MLPQ
(4 x 4 mm body)
20 Lead MLPQ
(4 x 4 mm body)
Order Quantity
3000 per reel
100 piece strips
ABSOLUTE MAXIMUM RATINGS
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the
device. These are stress ratings only and functional operation of the device, at these or any other
conditions, beyond those indicated in the operational sections of the specifications are not implied.
Operating Junction Temperature…………….. 0 to 150 C
o
o
Storage Temperature Range………………….-65 C to 150 C
MSL Rating………………………………………2
o
Reflow Temperature…………………………….260 C
PIN #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
PIN NAME
IOUT
PSI
DACIN
LGND
PHSIN
NC
PHSOUT
CLKIN
PGND
GATEL
NC
VCCL
BOOST
GATEH
SW
V
MAX
8V
8V
3.3V
n/a
8V
n/a
8V
8V
0.3V
8V
n/a
8V
40V
40V
34V
V
MIN
-0.3V
-0.3V
-0.3V
n/a
-0.3V
n/a
-0.3V
-0.3V
-0.3V
-0.3V DC, -5V for
100ns
n/a
-0.3V
-0.3V
-0.3V DC, -5V for
100ns
-0.3V DC, -5V for
100ns
-0.3V
-0.3V
-0.3V
-0.3V
n/a
I
SOURCE
1mA
1mA
1mA
n/a
1mA
n/a
2mA
1mA
5A for 100ns,
200mA DC
5A for 100ns,
200mA DC
n/a
n/a
1A for 100ns,
100mA DC
3A for 100ns,
100mA DC
3A for 100ns,
100mA DC
n/a
1mA
1mA
1mA
n/a
I
SINK
1mA
1mA
1mA
n/a
1mA
n/a
2mA
1mA
n/a
5A for 100ns,
200mA DC
n/a
5A for 100ns,
200mA DC
3A for 100ns,
100mA DC
3A for 100ns,
100mA DC
n/a
10mA
1mA
1mA
1mA
n/a
o
16
VCC
34V
17
CSIN+
8V
18
CSIN-
8V
19
EAIN
8V
20
NC
n/a
Note:
1. Maximum GATEH – SW = 8V
2. Maximum BOOST – GATEH = 8V
Page 2 of 19
October 27, 2008
IR3508
RECOMMENDED OPERATING CONDITIONS FOR RELIABLE OPERATION WITH MARGIN
o
o
8.0V
V
CC
28V, 4.75V
V
CCL
7.5V, 0 C
T
J
125 C. 0.5V
500kHz
&/.,1 0+],
250kHz
3+6,1 0+].
ELECTRICAL CHARACTERISTICS
The electrical characteristics table lists the parametric range guaranteed to be within the recommended operating
conditions. Typical values represent the median values, which are related to 25°C.
C
GATEH
= 3.3nF, C
GATEL
= 6.8nF (unless otherwise specified)
PARAMETER
Gate Drivers
GATEH Source Resistance
GATEH Sink Resistance
GATEL Source Resistance
GATEL Sink Resistance
GATEH Source Current
GATEH Sink Current
GATEL Source Current
GATEL Sink Current
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
Resistance
Clock
CLKIN Threshold
CLKIN Bias Current
CLKIN Phase Delay
PHSIN Threshold
PHSOUT Propagation
Delay
PHSIN Pull-Down
Resistance
PHSOUT High Voltage
PHSOUT Low Voltage
Page 3 of 19
TEST CONDITION
BOOST – SW = 7V. Note 1
BOOST – SW = 7V. Note 1
VCCL – PGND = 7V. Note 1
VCCL – PGND = 7V. Note 1
BOOST=7V, GATEH=2.5V, SW=0V.
BOOST=7V, GATEH=2.5V, SW=0V.
VCCL=7V, GATEL=2.5V, PGND=0V.
VCCL=7V, GATEL=2.5V, PGND=0V.
BOOST – SW = 7V, measure 1V to 4V
transition time
BOOST – SW = 7V, measure 4V to 1V
transition time
VCCL – PGND = 7V, Measure 1V to 4V
transition time
VCCL – PGND = 7V, Measure 4V to 1V
transition time
BOOST = VCCL = 7V, SW = PGND = 0V,
measure time from GATEL falling to 1V to
GATEH rising to 1V
BOOST = VCCL = 7V, SW = PGND = 0V,
measure time from GATEH falling to 1V to
GATEL rising to 1V
Note 1
MIN
TYP
1.0
1.0
1.0
0.4
2.0
2.0
2.0
4.0
5
5
10
5
10
10
30
20
20
80
MAX
2.5
2.5
2.5
1.0
UNIT
A
A
A
A
ns
ns
ns
ns
ns
ns
N
10
10
20
10
40
40
130
Compare to V(VCCL)
CLKIN = V(VCCL)
Measure time from CLKIN<1V to GATEH>1V
Compare to V(VCCL)
Measure time from CLKIN > (VCCL * 50% )
to PHSOUT > (VCCL *50%). 10pF Load @
o
125 C
40
-0.5
40
35
4
30
45
0.0
75
50
15
100
0.6
0.4
57
0.5
125
55
35
170
%
PA
ns
%
ns
N
V
I(PHSOUT) = -10mA, measure VCCL –
PHSOUT
I(PHSOUT) = 10mA
1
1
V
October 27, 2008
IR3508
PARAMETER
PWM Comparator
PWM Ramp Slope
EAIN Bias Current
Minimum Pulse Width
Current Sense Amplifier
CSIN+/- Bias Current
CSIN+/- Bias Current
Mismatch
Input Offset Voltage
Gain
Unity Gain Bandwidth
Slew Rate
Differential Input Range
Differential Input Range
Common Mode Input Range
o
Rout at T
J
= 25 C
o
Rout at T
J
= 125 C
IOUT Source Current
IOUT Sink Current
Share Adjust Amplifier
Input Offset Voltage
Gain
Unity Gain Bandwidth
PWM Ramp Floor Voltage
Maximum PWM Ramp Floor
Voltage
Minimum PWM Ramp Floor
Voltage
PSI Comparator
Rising Threshold Voltage
Falling Threshold Voltage
Hysteresis
Resistance
Floating Voltage
TEST CONDITION
Vin=12V
0
EAIN
3V
Note 1
MIN
42
-5
TYP
52.5
-0.3
55
0
0
0
32.5
6.8
6
-10
-5
0
2.3
3.6
0.5
0.5
-3
4
4
-116
120
-220
50
50
Note2
3.7
5.4
2.9
2.9
3
6
17
116
240
-100
MAX
57
5
70
200
50
1
35.0
8.8
UNIT
mV/
%DC
PA
ns
nA
nA
mV
V/V
MHz
V/Ps
mV
mV
V
k
k
mA
mA
mV
V/V
kHz
mV
mV
mV
Note 1
CSIN+ = CSIN- = DACIN. Measure
input referred offset from DACIN
0.5V
C(IOUT)=10pF. Measure at IOUT.
Note 1
0.8V
0.5V
Note 1
Note 1
-200
-50
-1
30.0
4.8
3.0
4.7
1.6
1.4
0
5.0
8.5
0
180
-160
Note 1
CSIN+ = CSIN- = DACIN. Note 1
Note 1
IOUT Open, Measure relative to DACIN
IOUT = DACIN – 200mV. Measure
relative to floor voltage.
IOUT = DACIN + 200mV. Measure
relative to floor voltage.
Note 1
Note 1
Note 1
520
400
50
200
800
620
550
70
500
700
650
120
850
1150
mV
mV
mV
k
mV
Page 4 of 19
October 27, 2008
IR3508
PARAMETER
Body Brake Comparator
Threshold Voltage with EAIN
decreasing
Threshold Voltage with EAIN
increasing
Hysteresis
Propagation Delay
OVP Comparator
OVP Threshold
TEST CONDITION
Measure relative to Floor Voltage
Measure relative to Floor Voltage
MIN
-300
-200
70
40
TYP
-200
-100
105
65
MAX
-110
-10
130
90
UNIT
mV
mV
mV
ns
VCCL = 5V. Measure time from EAIN <
V(DACIN) (200mV overdrive) to GATEL
transition to < 4V.
Step V(IOUT) up until GATEL drives
high. Compare to V(VCCL)
Propagation Delay
V(VCCL)=5V, Step V(IOUT) up from
V(DACIN) to V(VCCL). Measure time to
V(GATEL)>4V.
Synchronous Rectification Disable Comparator
Threshold Voltage
The ratio of V(CSIN-) / V(DACIN), below
which V(GATEL) is always low.
Negative Current Comparator
Input Offset Voltage
Note1
Propagation Delay Time
Apply step voltage to V(CSIN+) –
V(CSIN-). Measure time to V(GATEL)<
1V.
Bootstrap Diode
Forward Voltage
I(BOOST) = 30mA, VCCL = 6.8V
Debug Comparator
Threshold Voltage
Compare to V(VCCL)
General
VCC Supply Current
8V
9
(
VCC) < 10V
VCC Supply Current
10V
9
(
VCC)
9
VCCL Supply Current
BOOST Supply Current
4.75V
9
(
BOOST)-V(SW ) 8V
DACIN Bias Current
SW Floating Voltage
Note 1:
Guaranteed by design, but not tested in production
Note 2:
V
CCL
-0.5V or V
CC
– 2.5V, whichever is lower
-1.0
15
-0.8
40
-0.4
70
V
ns
66
75
86
%
-16
100
0
200
16
400
mV
ns
360
-250
1.1
1.1
3.1
0.5
-1.5
0.1
520
-150
4.0
2.0
8.0
1.5
-0.75
0.3
960
-50
6.1
4
12.1
3
1
0.4
mV
mV
mA
mA
mA
mA
PA
V
Page 5 of 19
October 27, 2008
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