STMicroelectronics STNRG388ATR

Overview

STNRG388A from STMicroelectronics is a digital controller IC for AC-DC and isolated DC-DC power conversion, integrating an STM8® microcontroller core, six SMED-based PWM generators (10 ns event response, 1.3 ns resolution), four analog comparators (<50 ns propagation), and a 10-bit ADC with 12-bit equivalent resolution via programmable gain. It operates from -40 °C to 105 °C and targets high-efficiency server PSUs and telecom rectifiers.

For engineers reviewing the STNRG388A datasheet, STNRG388A pinout, STNRG388A application, or STNRG388A equivalent, this page delivers verified technical context on SMED timing control, analog sensing architecture, TSSOP38 package constraints, and functional alternatives for digitally controlled power stages.

Technical Context

The STNRG388A implements a deterministic, event-driven control architecture centered on six independent State Machine Event Driven (SMED) modules-each capable of single, coupled, or dual-coupled PWM operation with up to three internal/external event inputs and sub-10 ns latency. Its 96 MHz PLL enables precise timing synchronization across multiple switching phases.

It combines real-time analog monitoring (four comparators with configurable hysteresis and <50 ns propagation) with a sequenced 10-bit SAR ADC (1 MΩ input impedance, x1/x4 gain) and integrated STM8® core (16 MHz max CPU frequency, Harvard architecture) to execute closed-loop power regulation without external co-processors.

Key Specifications

Pinout & Package

TSSOP38 package: 38-pin thin shrink small outline package, 0.65 mm pitch, body size 12.5 × 4.4 mm, exposed thermal pad (EP), RoHS-compliant, JEDEC MO-153AC compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with UCC2897A and ICE2PCS01, the STNRG388A uniquely integrates a programmable MCU, six hardware SMEDs, and analog sensing in one TSSOP38 device-enabling compact, software-defined power conversion without external signal conditioning or timing ICs.

Availability

STNRG388A is available at Aetrix Electronics and suitable for server PSUs, telecom rectifiers, and industrial UPS systems requiring stable component supply, long-term lifecycle assurance, and qualified operation up to 105 °C.

Supply support for STNRG388A 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, designing and manufacturing microcontrollers, power ICs, and analog/mixed-signal devices for industrial, automotive, and power electronics markets.

The STNRGxxx family was developed specifically for digitally controlled AC-DC and isolated DC-DC converters, emphasizing deterministic timing, integrated analog sensing, and firmware-upgradable power management in compact packages.

FAQ

What is the maximum switching frequency supported by the STNRG388A's SMED modules?

The STNRG388A's SMED modules support PWM frequencies up to 2 MHz in single-mode operation, enabled by its 96 MHz PLL clock and 1.3 ns PWM resolution. Coupled-mode configurations maintain sub-10 ns timing precision, making it suitable for resonant LLC and active clamp flyback topologies requiring tight dead-time control and adaptive frequency sweeping.

Does the STNRG388A include hardware-based protection features independent of firmware execution?

Yes-the STNRG388A implements hardware-enforced protections including comparator-based overcurrent shutdown (<50 ns response), SMED-level fault latching, and independent watchdog timers (IWDG/WWDG). These operate autonomously of the STM8® core, ensuring fail-safe behavior even during firmware lockup or memory corruption.

Can the STNRG388A's ADC measure both voltage and current simultaneously across multiple channels?

Yes-the 8-channel ADC sequencer supports automatic channel scanning with configurable sample-and-hold timing. With input impedance of 1 MΩ and selectable x1/x4 gain, it can concurrently acquire AC line voltage, DC bus voltage, and shunt-based current signals-enabling full-system state estimation without external multiplexers or amplifiers.

Is the TSSOP38 package of the STNRG388A thermally enhanced for high-power density designs?

Yes-the TSSOP38 package includes an exposed thermal pad (EP) that must be soldered to a PCB copper pour for effective heat dissipation. Thermal resistance θ_JA is specified at 50 °C/W under standard JEDEC 2-layer board conditions, enabling reliable operation at full load in ambient temperatures up to 105 °C when properly mounted.