IR3505ZMTRPBF International Rectifier, IR3505ZMTRPBF Datasheet - Page 12

• Manufacturer Part Number: IR3505ZMTRPBF
• Description: IC XPHASE3 CTLR 2.5A 16-MLPQ
• Manufacturer: International Rectifier
• Series: XPhase3™r

Specifications of IR3505ZMTRPBF

• Package / Case: 16-MLPQ
• Mounting Type: Surface Mount
• Current - Supply: 3mA
• Voltage - Supply: 8 V ~ 16 V
• Operating Temperature: 0°C ~ 125°C
• Applications: Processor
• Supply Voltage Range: 4.75V To 7.5V, 8V To 16V
• Operating Temperature Range: 0°C To +125°C
• Digital Ic Case Style: MLPQ
• No. Of Pins: 16
• Termination Type: SMD
• Function: For High Performance CPUs And ASICs
• Rohs Compliant: Yes
• Filter Terminals: SMD
• Controller Type: XPhase
• Package: 16-Lead MLPQ
• Circuit: X-Phase Phase IC
• Iout (a): 2.5A Gate Driver
• Pbf: PbF Option Available
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Over Voltage Protection (OVP)
The IR3505Z includes over-voltage protection that turns on the low side MOSFET to protect the load in the
event of a shorted high-side MOSFET, converter out of regulation, or connection of the converter output to an
excessive output voltage. As shown in Figure 6, if ISHARE pin voltage is above V(VCCL) – 0.8V, which
represents over-voltage condition detected by control IC, the over-voltage latch is set. GATEL drives high and
GATEH drives low. The OVP circuit overrides the normal PWM operation and within approximately 150ns will
fully turn-on the low side MOSFET, which remains ON until ISHARE drops below V(VCCL) – 0.8V when over
voltage ends. The over voltage fault is latched in control IC and can only be reset by cycling the power to
control IC. The error amplifier output (EAIN) is pulled down by control IC and will remain low. The lower
MOSFETs alone can not clamp the output voltage however an SCR or N-MOSFET could be triggered with the
OVP output to prevent processor damage.
FAULT LATCH
(CONTROL IC)
OUTPUT
VOLTAGE
ISHARE(IIN)
GATEH
GATEL
ERROR
AMPLIFIER
INPUT
(EAIN)
(VO)
Page 12 of 20
VCCL-800 mV
VDAC
OVP
THRESHOLD
Figure 6 - Over-voltage protection waveforms
NORMAL OPERATION
OVP CONDITION
March 17, 2009
IR3505Z
AFTER
OVP