IR3550MTRPBF International Rectifier, IR3550MTRPBF Datasheet - Page 17

• Manufacturer Part Number: IR3550MTRPBF
• Description: The IR3550 integrated PowIRstage is a synchronous buck gate driver IC with co-packed control and synchronous MOSFETs and Schottky diode.
• Manufacturer: International Rectifier

Specifications of IR3550MTRPBF

• Package: PQFN / 6 x 6
• Iout (a): 60
• Switch Freq (khz): up to 1.0MHz
• Input Range (v): 4.5 - 15
• Output Range (v): 0.25 - (VCC -2.5)

INPUT CAPACITORS C
At least two 10uF 1206 ceramic capacitors and one 0.1uF
0402 ceramic capacitor are recommended for decoupling
the VIN to PGND connection. The 0.1uF 0402 capacitor
should be on the same side of the PCB as the IR3550 and
next to the VIN and PGND pins. Adding additional
capacitance and use of capacitors with lower ESR and
mounted with low inductance routing will improve
efficiency and reduce overall system noise, especially in
single-phase designs or during high current operation.
BOOTSTRAP CAPACITOR C
A minimum of 0.22uF 0402 capacitor is required for the
bootstrap circuit. A high temperature 0.22uF or greater
value 0402 capacitor is recommended. It should be
mounted on the same side of the PCB as the IR3550 and as
close as possible to the BOOST pin. A low inductance
routing of the SW pin connection to the other terminal of
the bootstrap capacitor is strongly recommended.
VCC DECOUPLING CAPACITOR C
A 0.1uF to 1uF ceramic decoupling capacitor is required at
the VCC pin. It should be mounted on the same side of the
PCB as the IR3550 and as close as possible to the VCC and
PGND (pin 4). Low inductance routing between the VCC
capacitor and the IR3550 pins is strongly recommended.
BODY-BRAKING® FEATURE
The BBRK# pin should be pulled up to VCC if the feature is
not used by the PWM controller. Use of a small value
resistor or a direct connection to VCC is recommended.
MOUNTING OF HEAT SINKS
Care should be taken in the mounting of heat sinks so as
not to short-circuit nearby components. The VCC and
Bootstrap capacitors are typically mounted on the same
side of the PCB as the IR3550. The mounting height of
these capacitors must be considered when selecting their
package sizes.
HIGH OUTPUT VOLTAGE DESIGN
CONSIDERATIONS
The IR3550 is capable of creating output voltages above
the 3.3V recommended maximum output voltage as there
are no restrictions inside the IR3550 on the duty cycle
applied to the PWM pin. However if the current sense
feature is required, the common mode range of the
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March 12, 2012 | FINAL DATASHEET
VIN
BOOST
VCC
60A Integrated PowIRstage®
current sense amplifier inputs must be considered. A
violation of the current sense input common mode range
may cause unexpected IR3550 behavior. Also the output
current rating of the device will be reduced as the duty
cycle increases. In very high duty cycle applications
sufficient time must be provided for replenishment of the
Bootstrap capacitor for the control MOSFET drive.
LAYOUT EXAMPLE
Contact International Rectifier for a layout example
suitable for your specific application.
IR3550