XR77103

The XR77103 features three synchronous, wide input range, high efficiency buck converters. Each converter is digitally programmable requiring minimal external components thus providing the smallest size solution possible.

The converters can operate in 5V, 9V and 12V systems and have integrated power switches. The output voltage of each converter can be adjusted by programming the values in the VOUT setting registers through an I²C interface. The adjustable range is 0.8~6V with 50mV resolution. The output voltage can also be set externally using an external resistor divider. Output sequence among the outputs, soft-start time and the peak inductor current limit are also set through I²C.

The switching frequency of the converters can either be set with I²C or can be synchronized to an external clock. The switching regulators are designed to operate from 300kHz to 2.2MHz. Each converter operates in phase or out of phase according to the value in the phase setting register. This can minimize the input filter requirements.

XR77103 features a supervisor circuit that monitors each converter output. PGOOD pin is asserted once sequencing is done, all outputs are reported in regulation and the reset timer expires. The polarity of the signal is active high.

XR77103 also features a light load Pulse Skipping Mode (PSM). It is set through I²C. The PSM mode allows for a reduction on the input power supplied to the system when the host processor is in stand-by mode (low activity) mode.

• 4.5V to 14V wide input supply voltage range
• Built-in MOSFET and synchronous rectifier
• I²C programmable supplies
• Output voltage (0.8~6V)
• Power on sequence
• Soft-start timing
• Switching frequency (300kHz~2.2MHz)
• Individual current limit
• Optional power saving mode at light loads
• Non Volatile Memory (NVM) with up to 10,000 times write operation
• 0.8V, high accuracy reference (1%)
• Current-mode control with simple compensation circuit
• External synchronization
• Power good
• Protection
• Thermal shutdown
• Overvoltage transient protection
• Overcurrent protection
• Third-Party Programming Support
• Supported by Excel Configuration Tool
• Evaluation Board, Demo Kit and Configuration Module (XCM) are available for evaluation and development purposes only
• 32-pin, 4 x 4mm TQFN package
• Pin-compatible non-programmable versions
• XR77103-A0R5 (f = 500kHz)
• XR77103-A1R0 (f = 1MHz)

• Low power FPGA and DSP supplies
• Video processor supplies
• Home gateways
• Telecommunications and infrastructure equipment
• Industrial control and automation
• Base stations, switches/routers