The FAN5250 is a single output power controller to power mobile CPU cores. The FAN5250 includes a 5-bit digital-to-analog converter (DAC) that adjusts the core PWM output voltage from 0.6VDC to 1.75VDC, and may be changed during operation. Special measures are taken to allow the output to transition with controlled slew rate to comply with Transmeta's LongRun™ and Intel's P3-M Speed-Step™ requirements.
The FAN5250 is a single‑output power management IC designed to supply low‑voltage, high‑current power to mobile CPU cores. It features a 5‑bit DAC for output voltage programming from 0.6 V to 1.75 V, optional external current‑sense resistor, and adaptive dead‑time drivers for N‑channel MOSFETs. The device supports selectable 300 kHz or 600 kHz switching frequencies and includes over‑current, over‑voltage, and under‑voltage protection.
The datasheet provides pin assignments, absolute maximum ratings, recommended operating conditions, electrical specifications, mechanical dimensions, and ordering information. It also describes the soft‑start function, hysteretic mode operation, and alternative voltage programming via the ALTV pin.
| Supply Voltage (VCC) Typical | 5 V |
|---|---|
| Input Voltage (VIN) Range | 5 V to 24 V |
| Switching Frequency | 300 kHz or 600 kHz |
| Over‑Voltage Threshold | 1.9 V to 2.0 V |
| Under‑Voltage Shutdown Level | 75 % of set value |
The FAN5250 allows selection of either 300 kHz or 600 kHz switching frequency.
EN enables the IC operation and toggling it also resets the chip after a latched fault condition.