BD71815AGW-E2

BD71815AGW-E2 is a ROHM Semiconductor multi‑channel DC‑DC buck regulator PMIC. It provides several independently programmable buck converters with integrated high‑efficiency MOSFETs, gate drivers, and current sensing to generate CPU/GPU and other rails from a single input—commonly used on laptop motherboards and embedded boards. The GW part denotes RoHM’s GW‑series QFN package with an exposed pad, and E2 is the temperature/grade variant.
Key features:
- I2C/PMBus‑like interface for per‑channel voltage programming, sequencing, and telemetry
- High efficiency with PWM/PFM operation and current‑mode control
- Per‑channel protection: overcurrent/short, over/under‑voltage, over‑temperature, UVLO; fault reporting
- Requires external inductors, capacitors, and sense components per channel
Common usage:
- Generate multiple rails (CPU core, memory, chipset) from a single supply in notebooks and embedded systems; supports safe voltage ramping and sequencing.

BD71815AGW-E2 features (concise):
- Digital multi-phase buck regulator controller with gate-drive outputs for external MOSFETs (synchronous)
- I2C-compatible control interface for VID/voltage profiles, status and fault reporting
- Supports multi-phase operation with phase interleaving and current balancing
- Programmable switching frequency; optional spread-spectrum
- Adjustable per-phase output voltages; adaptive voltage scaling (AVS)
- Soft-start and ramp control
- High efficiency due to synchronous rectification
- Comprehensive protections: UVLO, over-voltage/over-current, thermal shutdown, short-circuit protection
- Monitoring: Vout, current sense, temperature, fault/status flags
- Power-good/rail enable signals and fault reporting
- Flexible packaging (E2 variant); supports external MOSFETs (or optional integrated MOSFETs in some configs)
- Suitable for CPU/GPU VRMs and other multi-rail DC-DC applications
Note: exact channel count, voltage/current specs, and MOSFET integration depend on the specific variant and package. Please refer to the formal datasheet for precise numbers.

- Pin count: 40 pins (QFN package)
- Function: Multi‑phase buck regulator controller/driver (VRM) for CPU core voltage, providing PWM/gate drives to external MOSFETs, voltage sensing, and protection features (OVP/UVLO/OTP, etc.).

Manufacturer: RichTek Technology Corp. (Richtek).
What kind of company: A Taiwan-based fabless semiconductor company that designs and sells power-management ICs, including switching regulators and PMICs for consumer electronics.

BD71815AGW-E2 is a multi‑cell Li‑ion battery protection and monitoring IC (BMU/PMIC). It supports 1–4 cell packs, providing over/under voltage, overcurrent/short‑circuit protection, cell balancing, temperature sensing, and coulomb counting; it drives external FETs and power-path control. Typical applications include notebook battery packs, tablets and mobile power banks, cordless tools, and small energy‑storage systems requiring reliable battery protection and monitoring.

BD71815AGW-E2 uses a QFN package (GW family) with an exposed pad.