LTC3895IFE#PBF

The LTC3895IFE#PBF is Linear Technology’s (now Analog Devices) Pb‑free, high‑voltage multi‑phase buck controller. It drives external MOSFETs to build high‑current VRMs (CPU/GPU and similar loads). Key points:
- Input range up to about 60 V; uses current‑mode, multi‑phase (two interleaved phases) synchronous buck control.
- Programmable switching frequency (from tens to hundreds of kHz), fast transient response.
- Features: programmable soft‑start, enable/disable, current limit, overvoltage/overcurrent protection, voltage feedback, remote sense, and fault/status reporting.
- It does not include MOSFETs or passive components; you add external N‑MOSFETs, inductors, and capacitors.
- IFE#PBF denotes the specific Pb‑free package variant; refer to the datasheet for the exact pinout and footprint.
Typical applications: high‑current CPU/GPU core rails and other multi‑phase power supplies requiring fast load transient performance.

Here are the key features of LTC3895IFE#PBF (a 3‑phase interleaved, synchronous buck controller):
- Three-phase interleaved synchronous buck controller for high-current CPU/core rails
- External N‑channel MOSFETs required (drives high‑side/low‑side per phase)
- Wide input range (typical 4V–38V)
- Analog, current‑mode control with cycle‑by‑cycle per‑phase current limit and current sharing
- Programmable switching frequency with synchronization to an external clock
- Soft-start, voltage tracking, enable input, and power‑good output
- Remote sense and adjustable output voltage via external resistor network
- Protections: UVLO, overvoltage protection, per‑phase overcurrent protection, thermal shutdown
- Fault reporting/status outputs for monitoring
- Pb-free, lead‑free solderability (IFE#PBF packaging)
Note: No internal FETs are included; requires external MOSFETs and inductor/filter components to form the complete regulator.

- Pin count: 32 pins (32‑lead package, RoHS lead-free PBF version).
- Function: LTC3895IFE#PBF is a dual multiphase, synchronous buck controller for high‑current VRMs. It drives two switching phases via external MOSFET gates, uses current sensing and feedback to regulate the output, and provides protections (overcurrent/overvoltage/undervoltage), soft-start, and interleaved operation.

Manufacturer: Analog Devices, Inc. (brand: Linear Technology; LTC3895IFE#PBF originated from Linear Technology before ADI’s acquisition).
What kind of company: A multinational US semiconductor company that designs, manufactures, and markets analog, mixed-signal, and DSP integrated circuits for automotive, industrial, communications, and consumer electronics.

- Multi-rail VRMs for high-performance CPUs/GPUs, memory and chipset rails
- Server, data-center, workstation motherboards and telecom/network equipment
- Telecom infrastructure power supplies and line cards
- Industrial and embedded systems needing high input voltage and efficient, multiple low-voltage rails
- Point-of-load (POL) regulators for FPGAs, ASICs, DSPs and SoCs
Notes: LTC3895 is a high-voltage, multi-phase interleaved DC-DC controller suitable for converting a wide input range to several low-voltage rails with high current and efficiency.

Pb-free 32-pin QFN package.