IR3523MTRPBF International Rectifier, IR3523MTRPBF Datasheet - Page 17

• Manufacturer Part Number: IR3523MTRPBF
• Description: IC XPHASE3 CTLR VR11.1 40-MLPQ
• Manufacturer: International Rectifier
• Series: XPhase3™r

Specifications of IR3523MTRPBF

• Applications: Processor
• Current - Supply: 10mA
• Voltage - Supply: 4.75 V ~ 7.5 V
• Operating Temperature: 0°C ~ 100°C
• Mounting Type: Surface Mount
• Package / Case: 40-MLPQ
• Ic Function: Dual Output Control IC
• Supply Voltage Range: 4.75V To 7.5V
• Operating Temperature Range: 0°C To +150°C
• Digital Ic Case Style: MLPQ
• No. Of Pins: 40
• Controller Type: XPhase
• Rohs Compliant: Yes
• Package: 40-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

Output1 Inductor DCR Temperature Compensation
A negative temperature coefficient (NTC) thermistor can be used for Output1 inductor DCR temperature
compensation. The thermistor should be placed close to the Output1 inductors and connected in parallel with the
feedback resistor, as shown in Figure 10. The resistor in series with the thermistor is used to reduce the nonlinearity
of the thermistor.
Remote Voltage Sensing
VOSENX+ and VOSENX- are used for remote sensing and connected directly to the load. The remote sense
differential amplifiers with high speed, low input offset, and low input bias current ensure accurate voltage sensing
and fast transient response.
Start-up Sequence
The IR3523 has a programmable soft-start function to limit the surge current during the converter start-up. A
capacitor connected between the SS/DELx and LGND pins controls soft start timing, over-current protection delay
and hiccup mode timing. A charge current of 50uA and discharge currents of 47uA and 4.5uA control the up slope
and down slope of the voltage at the SS/DEL pin respectively.
Page 17 of 37
Figure 10 - Temperature compensation of Output1 inductor DCR
IFB
Remote
Sense
Amplifier
Control IC
VDAC1
VDRP
Amplifier
Error
Amplifier
+
-
-
+
+
-
EAOUT1
VDAC1
FB1
IIN1
VOUT1
VOSEN1+
VOSEN1-
VDRP1
RDRP1
RFB12
RFB11
Rt
June 20, 2008
IR3523