Infineon Technologies CHL8212-02CRT

Overview

CHL8212-02CRT from Infineon Technologies is a dual-output digital multi-phase buck controller supporting 2+1 and 3+1 phase configurations for GPU voltage regulation, featuring I²C programmability, IR Adaptive Transient Algorithm (ATA), Dynamic Phase Control (DPC), and 200 kHz–1.2 MHz per-phase switching frequency. It operates from 3.3 V ±10%/−15% supply across 0°C to 85°C in a 28-pin 5×5 mm QFN package.

For engineers reviewing the CHL8212-02CRT datasheet, CHL8212-02CRT pinout, CHL8212-02CRT application in GPU VRMs, or CHL8212-02CRT equivalent for multi-phase digital power control, this controller delivers verified VID-select-driven dynamic voltage transitions, per-loop OVP/UVP/OCP protection, and MTP-configurable fault thresholds with thermal monitoring via VRHOT#.

Technical Context

The CHL8212 implements two independent digital PWM control loops with fully programmable loop parameters via I²C, including phase count (2+1 or 3+1), switching frequency (200 kHz–1.2 MHz), and ATA response gain. Each loop supports real-time current sensing via dedicated ISEN inputs and features separate VRRDY status flags.

It integrates IR Efficiency Shaping Technology with Dynamic Phase Control to enable automatic phase shedding and active diode emulation at light load, while the I²C security enable pin and programmable address support secure configuration in multi-controller systems without bus contention.

Key Specifications

Pinout & Package

CHL8212-02CRT is housed in a 28-pin QFN package (5 mm × 5 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are validated per Figure 3 of the CHL8203/12/13/14 datasheet (V1.6, Aug 2013).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-loop digital multi-phase buck controller applications.

Compared with CHL8213-00CRT, CHL8212-02CRT offers identical control algorithms and feature set in a smaller 5×5 mm package but omits dual thermistor inputs; versus MP8765GQ-Z, it trades analog simplicity for full digital configurability, adaptive transient response, and secure I²C management - critical for modern GPU VRD compliance.

Availability

CHL8212-02CRT is available at Aetrix Electronics and suitable for GPU voltage regulation, GDDR memory power delivery, and overclocking-capable graphics card designs requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for CHL8212-02CRT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Infineon Technologies is a German semiconductor manufacturer specializing in power management, automotive, and industrial control ICs, with leadership in digital power controller innovation since the early 2000s.

The CHL82xx family was designed specifically for high-density, high-efficiency GPU voltage regulator modules (VRMs), emphasizing digital configurability, thermal resilience, and seamless integration with NVIDIA/AMD reference designs.

FAQ

What is the function of the VRHOT# pin on CHL8212-02CRT?

VRHOT# is an active-low, open-drain thermal alert output that asserts when the internal junction temperature exceeds the programmed threshold (default 125°C). It connects directly to GPU ASIC thermal interrupt pins or system PMICs to trigger immediate throttling or graceful shutdown, independent of software polling. The threshold is configurable via I²C register 0x2A.

Does CHL8212-02CRT support both 2+1 and 3+1 phase configurations?

Yes - CHL8212-02CRT supports either 2+1 (two phases on Loop 1, one on Loop 2) or 3+1 (three phases on Loop 1, one on Loop 2) configurations. Phase assignment is controlled via I²C registers 0x10–0x12 and confirmed by PWM pin activity. No hardware strapping is required; configuration is fully software-defined.

Can CHL8212-02CRT be used without the I²C interface?

No - I²C is mandatory for initial configuration, MTP programming, and runtime telemetry. While basic PWM operation may begin after power-up using default MTP values, critical functions like VID selection, ATA tuning, fault thresholds, and VRHOT# enable require I²C access. The ADDR/PROT pin must be pulled high or low to set the base I²C address before communication.

How does the Slow OCP feature protect against thermal overload?

Slow OCP configures a longer overcurrent response time (programmable from 100 ns to 100 μs) to match GPU Thermal Design Current (TDC) profiles. Unlike fast OCP that trips on brief current spikes, Slow OCP tolerates burst loads typical of GPU shader activity while still protecting against sustained overloads that cause die heating - preventing premature shutdown during valid compute workloads.