PMBus power system manager features ±0.25% voltage accuracy

The device trims, margins and monitors supply outputs with best-in-class ±0.25% voltage accuracy, raising circuit board yields and long-term reliability. Supply sequencing (timed and tracking), supervision and EEPROM fault-logging are also built in. All basic passive components-low pass RC filters, bypass capacitance and pull-up resistors-are integrated. The high functional and component integration reduces solution footprint, shortens the bill of materials and eases routing on large rail-count ASIC, DSP and FPGA boards in servers, network routers and industrial test equipment.

A 16-bit ADC in the LTM2987 measures supply output voltages, input voltage and device temperature. Fast under- and overvoltage supervisors prevent system malfunction and damage. Faults trigger EEPROM black box recording, which simplifies failure analysis while providing insight into future system improvements. Multiple Power System Managers can be cascaded to sequence and fault-manage more than 16 rails. Over one hundred PMBus compatible commands are provided for flexible programming and data readback of the power system. Register configuration is accomplished through the LTpowerPlay development environment, which supports all Linear Technology digital Power System Management (PSM) devices. Once programmed, no software coding is needed for autonomous operation.

Specified over the commercial (from 0 to +70°C) and industrial temperature range (from -40 to +105°C), the LTM2987 is offered in a 144-pin 15x15mm BGA (ball grid array) package. 1,000 unit quantity pricing starts at $23.95 (USD) each.