The ISL8273M is a complete PMBus enabled DC/DC single
channel step-down advance power supply capable of delivering
up to 80A of current and optimized for high power density
applications. For higher output current, up to four ISL8273Ms
can be paralleled to supply up to 320A in a multiphase current
sharing configuration.
Operating over an input voltage range of 4.5V to 14V, the
ISL8273M offers adjustable output voltages down to 0.6V and
achieves up to 93% conversion efficiencies. A unique
ChargeMode™ control architecture provides a single clock cycle
response to an output load step and can support switching
frequencies up to 1MHz. The power module integrates all power
and most passive components and only requires a few external
components to operate. A set of optional external resistors allows
the user to easily configure the device for standard operation. For
advanced configurations, a standard PMBus interface addresses
such things as sequencing and fault management, as well as
real-time full telemetry and point-of-load monitoring. Additionally,
an on-board nonvolatile memory can store the desired custom
configuration and settings.
A fully customizable voltage, current and temperature
protection scheme insures safe operation for the ISL8273M
under abnormal operating conditions. The device is also
supported by the PowerNavigator™ software, a full digital
power train development environment.
The ISL8273M is available in a low profile compact
18mmx23mmx7.5mm fully encapsulated thermally enhanced
HDA package.

Features
• Complete digital power supply
• 80A single channel output current
- 4.5V to 14V single rail input voltage
- Up to 93% efficiency
- Up to 320A/4 parallel modules capable solution
- Multiphase and current sharing operations (180°/22.5°
steps)
• Programmable output voltage
- 0.6V to 2.5V output voltage settings
- ±1% accuracy over line/load/temperature
• ChargeMode™ control loop architecture
- 296kHz to 1.06MHz fixed switching frequency operations
- No compensation required
- Fast single clock cycle transient response
• PMBus interface and/or pin-strap mode
- Fully programmable through PMBus
- Pin-strap mode for standard settings
- Real-time telemetry for VIN, VOUT, IOUT, temperature, duty
cycle and fSW
• Advanced soft-start/stop, sequencing and margining
• On-board nonvolatile memory
• Complete over/undervoltage, current and temperature
protections with fault logging
• PowerNavigator™ supported
• Thermally enhanced 18mmx23mmx7.5mm HDA package

Applications
• Server, telecom, storage and datacom
• Industrial/ATE and networking equipment
• General purpose power for ASIC, FPGA, DSP and memory