XR77103-A1R0 and XR77103-A0R5 Buck Regulators

By MaxLinear 179

XR77103-A1R0 and XR77103-A0R5 Buck Regulators

MaxLinear's XR77103-A1R0 and XR77103-A0R5 feature three synchronous, wide input range, high-efficiency buck converters that can operate in 5 V, 9 V, and 12 V systems and have integrated power switches. Two of the outputs may be paralleled for output currents up to 5 A peak with a steady-state current of up to 4 A.

The output voltage of each converter can be adjusted by external resistor divider down to a voltage as low as 0.8 V. With a nominal switching frequency of 1 MHz for the A1R0 and 500 MHz for the A0R5, these regulators can also be synchronized to an external clock in applications where EMI control is critical.

XR77103-A1R0 and XR77103-A0R5 feature a supervisor circuit that monitors each converter output. PGOOD pin is asserted once sequencing is done, outputs are reported in regulation and the reset timer expires. The polarity of the signal is active high. A pulse skipping mode (PSM) reduces switching losses maintaining high efficiency when the system is unloaded or in standby mode.

Features
  • 4.5 V to 14 V wide input supply voltage range
  • Built-in MOSFET and synchronous rectifier
  • Three 2 A buck regulators
    • Parallel operation allows two outputs in parallel for 5 A peal output (4 A steady state)
  • 0.8 V, high accuracy reference (1%)
  • Current-mode control with simple compensation circuit
  • External synchronization
  • Power good
  • Protection
    • Thermal shutdown
    • Overvoltage transient protection
    • Overcurrent protection
  • 32-pin 4 mm x 4 mm TQFN package
Applications
  • FPGA and DSP supplies
  • Video processor supplies
  • Applications processor power
  • Home gateways
  • Telecommunications and infrastructure equipment
  • Industrial control and automation
  • Base stations, switches/routers

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