IR3508MTRPBF ,A full featured and flexible way to implement a power solution for the latest high performance CPUs and ASICs.FEATURES IR3508 PHASE IC x Power State Indicator (PSI) interface provides the capability to maximiz ..
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IR3508MTRPBF
A full featured and flexible way to implement a power solution for the latest high performance CPUs and ASICs.
International
Isaa Rectifier IR3508
DATA SHEET
XPHASE3TM PHASE IC
DESCRIPTION
The IR3508 Phase IC combined with any IR XPhase3TM 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
phase of a multiphase converter. The XPhase3TM 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.
FEATURES IR3508 PHASE IC
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-I.4V)
Loss-Iess 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
SeIf-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
'2V|:>
EAIN|:>
, 9 e '2 a);
9 g g 5, F', RCS CCS
IOUT =-I IOUT 0 SW 15 - _ _
PSI D—Z PSI GATEH 14 r-YJ- L voun
oAcurq=-r'- DACIN IR3508 BOOST 13 H W Cl
5 PHSIN 5 NC _11
o E D d H
E E E F 5 --lJe COUT =
o' rs m m g VOUT-
PHSIN Cl
PHSOUTD ll :":
CLKIND— CVCCL
VCCL|:>
Figure 1 Application Circuit
Page 1 of 19 October 27, 2008
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International
TtOR Rectifier
IR3508
ORDERING INFORMATION
Part Number
Package
Order Quantity
IR3508MTRPBF
20 Lead MLPQ
(4 x 4 mm body)
3000 per reel
* IR3508MPBF
20 Lead MLPQ
(4 x 4 mm body)
100 piece strips
* Samples only
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
Storage Temperature Range ...................... -65°C to 150°C
MSL Rating ............................................. 2
Reflow Temperature .................................. 260°C
PIN # PIN NAME VMAX VMIN Isounce ISINK
1 IOUT 8V -0.3V 1mA 1mA
2 PSI 8V -0.3V 1mA 1mA
3 DACIN 3.3V -0.3V 1mA 1mA
4 LGND n/a n/a n/a n/a
5 PHSIN 8V -0.3V 1mA 1mA
6 NC n/a n/a n/a n/a
7 PHSOUT 8V -0.3V 2mA 2mA
8 CLKIN 8V -0.31/ 1mA 1mA
9 PGND 0.3V -0.3V 5A for 100ns, n/a
200mA DC
10 GATEL 8V -0.3V DC, -5V for 5A for 100ns, 5A for 100ns,
100ns 200mA DC 200mA DC
11 NC n/a n/a n/a n/a
12 VCCL 8V -0.3V n/a 5A for 100ns,
200mA DC
13 BOOST 40V -0.3V IA for 100ns, 3A for 100ns,
100mA DC 100mA DC
14 GATEH 40V -0.3V DC, -5V for 3A for 100ns, 3A for 100ns,
100ns 100mA DC 100mA DC
15 SW 34V -0.3V DC, -5V for 3A for 100ns, n/a
100ns 100mA DC
16 VCC 34V -0.3V n/a 10mA
17 CSIN+ 8V -0.3V 1mA 1mA
18 CSIN- 8V -0.3V 1mA 1mA
19 EAIN 8V -O.3V 1mA 1mA
20 NC n/a n/a n/a n/a
l. Maximum GATEH - SW = 8V
2. Maximum BOOST - GATEH = 8V
Page 2 of 19 October 27, 2008
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