IR3503MTRPBF International Rectifier, IR3503MTRPBF Datasheet - Page 16

• Manufacturer Part Number: IR3503MTRPBF
• Description: IC CTRL XPHASE VR11.0/1 32-MLPQ
• Manufacturer: International Rectifier
• Series: XPhase3™r

Specifications of IR3503MTRPBF

• Applications: Processor
• Current - Supply: 8mA
• Voltage - Supply: 4.75 V ~ 7.5 V
• Operating Temperature: 0°C ~ 100°C
• Mounting Type: Surface Mount
• Package / Case: *
• Package: 32-Lead MLPQ
• Circuit: X-Phase Control IC
• Switch Freq (khz): 250kHz to 1.5MHz
• Pbf: PbF Option Available
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: IR3503MTRPBFTR

Inductor DCR Temperature Compensation
Remote Voltage Sensing
VOSEN+ and VOSEN- are used for remote sensing and connected directly to the load. The remote sense differential
amplifier with high speed, low input offset and low input bias current ensures accurate voltage sensing and fast
transient response. There is finite input current at both pins VOSEN+ and VOSEN- due to the internal resistor of the
differential amplifier. This limits the size of the resistors that can be used in series with these pins for acceptable
regulation of the output voltage.
A negative temperature coefficient (NTC) thermistor should be used for inductor DCR temperature compensation. The
thermistor and tuning resistor network connected between the VN and VDRP pins provides a single NTC thermal
compensation. The thermistor should be placed close to the power stage to accurately reflect the thermal performance of
the inductor DCR. The resistor in series with the thermistor is used to reduce the nonlinearity of the thermistor.
Page 16 of 39
February 12, 2010
IR3503