STMicroelectronics STNRG328ATR

Overview

STNRG328ATR from STMicroelectronics is a digital power controller IC designed for AC-DC and isolated DC-DC converters, integrating an STM8® microcontroller core, six SMED-based PWM generators (10 ns event detection, 1.3 ns resolution), four analog comparators (<50 ns propagation), and a 10-bit ADC with op-amp gain (x1/x4) for real-time voltage/current regulation in server PSUs and telecom rectifiers.

For engineers reviewing the STNRG328ATR datasheet, STNRG328ATR pinout, STNRG328ATR application, or STNRG328ATR equivalent, this device supports high-precision digital control of resonant topologies (LLC, active clamp flyback), offers dual-mode PWM coupling, on-chip 96 MHz PLL clocking, and operates across –40 °C to 105 °C with integrated E2PROM for firmware and calibration storage.

Technical Context

The STNRG328ATR implements a deterministic, event-driven control architecture centered on six independent State Machine Event Driven (SMED) modules, each supporting single/coupled PWM operation with up to three internal/external event inputs and sub-10 ns latency. Its 16 MHz STM8® core executes closed-loop algorithms while offloading timing-critical waveform generation to hardware SMEDs.

It integrates four fast analog comparators with configurable hysteresis and four internal 4-bit references, enabling direct overvoltage/overcurrent protection without ADC conversion delay. The 10-bit SAR ADC (with op-amp pre-gain) provides 12-bit effective resolution for precise feedback sampling, sequenced across up to eight channels with 1 MΩ input impedance.

Key Specifications

Pinout & Package

TSSOP38 package: 38-pin thin shrink small outline package, 0.65 mm pitch, body size 12.5 × 4.4 mm, lead-free and RoHS compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar digital power controller applications.

Compared with UCC28950 and ICE2PCS01, STNRG328ATR uniquely combines embedded firmware execution, hardware-accelerated SMED PWM, and integrated analog front-end - enabling single-chip digital control of complex multi-stage power converters without external processors or signal-conditioning ICs.

Availability

STNRG328ATR is available at Aetrix Electronics and suitable for server PSUs, telecom rectifiers, and industrial UPS systems requiring stable component supply, long-lifecycle support, and production-ready digital power control solutions.

Supply support for STNRG328ATR 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in microcontrollers, power management, and analog/mixed-signal ICs for industrial, automotive, and power electronics markets.

The STNRGxxx series was developed specifically for digitally controlled AC-DC and isolated DC-DC power conversion, targeting high-efficiency, compact, and field-upgradable power supplies in datacenter and telecom infrastructure.

FAQ

What is the maximum switching frequency supported by STNRG328ATR's SMED modules?

The STNRG328ATR's SMED modules support PWM generation up to 2 MHz, enabled by 1.3 ns resolution and 10 ns event reaction time. This allows direct control of high-frequency LLC and GaN-based converters without external gate drivers or timing ICs, with hardware-enforced dead-time and phase-shift accuracy.

Does STNRG328ATR include built-in DALI-2 communication capability?

Yes, STNRG328ATR integrates a full DALI-2 transceiver compliant with IEC 62386-102, including noise rejection filtering, differential line driver/receiver, and protocol stack support in firmware. It requires only two external 10 Ω resistors and one 100 nF capacitor for physical layer implementation.

How is flash memory protected against accidental overwrite during field updates?

STNRG328ATR implements multiple hardware protections: read-out protection (ROP), user boot code (UBC) locking, and option byte write protection. Flash writes require explicit unlock sequences and ECC validation; partial sector erase is supported, and RWW (read-while-write) allows concurrent execution and update without system halt.

Can STNRG328ATR operate standalone without external crystal?

Yes - it includes internal 16 MHz RC (trimmable ±1%) and 153.6 kHz low-power RC oscillators, plus a 96 MHz PLL. External crystal (1–24 MHz) is optional for higher clock accuracy; the internal RC sources enable full functionality in cost-sensitive designs where ±2% timing tolerance is acceptable.