Analog Devices LTC1840IGN#PBF, PMOS Fan Controller - Speed, I²C/SMBus interface, 2.7V-5.75V supply, Pre-Driver - High Side (2), -40°C to 85°C, 16-SSOP package.
| Parameter | Value |
|---|---|
| Mounting | Surface Mount |
| Motor type - AC, DC | Brushed DC |
| Voltage | 2.7V ~ 5.75V |
| Interface | I²C, SMBus |
| Operating temperature | -40°C ~ 85°C (TA) |
| Package | Tube |
| Function | Controller - Speed |
| Technology | PMOS |
| Applications | Fan Controller |
| Case | 16-SSOP (0.154\", 3.90mm Width) |
| Output configuration | Pre-Driver - High Side (2) |
The pre-driver high-side output configuration (2) means this part does not integrate power MOSFETs — it drives external N-channel FETs. That keeps the heat out of the controller and lets you scale the fan current by choosing appropriate FETs. The I²C/SMBus interface simplifies wiring: a single two-wire bus controls multiple fan channels without extra GPIOs.
No end-of-life notice or last-time-buy schedule is in effect.
It is designed as a fan controller for brushed DC fans, typically used in server power supplies, telecom equipment, and industrial systems where digital speed control via I²C or SMBus is required.
No direct pin-compatible replacement is listed. The LTC1695CS5#TRMPBF is a different part — a fully integrated fan driver for brushless DC fans with a 0.18 A output, not a pre-driver for brushed DC motors. Verify your motor type and drive topology before substituting.
The datasheet for the LTC1840IGN#PBF is available from Analog Devices and covers the I²C/SMBus command set, external FET selection guidelines, and thermal layout recommendations.