STMicroelectronics E-SG2525AN

Overview

E-SG2525AN from STMicroelectronics is a regulating pulse-width modulation (PWM) controller IC designed for switch-mode power supply (SMPS) control in single-ended and push-pull topologies. It features a trimmed 5.1 V ±1% reference, 100 Hz–400 kHz oscillator range, adjustable deadtime via external resistor, internal soft-start, and pulse-by-pulse shutdown. It operates from 8–35 V supply and drives external power stages in DC-DC converters and offline AC-DC supplies.

For engineers reviewing the E-SG2525AN datasheet, E-SG2525AN pinout, E-SG2525AN application, or E-SG2525AN equivalent, key selection criteria include oscillator frequency tuning range, undervoltage lockout hysteresis (≈500 mV), NOR-logic output stage behavior, latch-based PWM termination, and dual-source/sink driver capability (≥200 mA).

Technical Context

The E-SG2525AN integrates an error amplifier with rail-to-rail common-mode input (including the 5.1 V reference), a precision oscillator with sync input and external timing components (RT/CT/RD), and a PWM comparator with 0–49% duty-cycle limit. Its internal latch ensures single-pulse per clock cycle, preventing multiple switching events during fault conditions.

It implements undervoltage lockout (UVLO) with 6–8 V turn-on threshold and ≈500 mV hysteresis, plus dedicated shutdown logic that controls both PWM latch and soft-start capacitor discharge. Output drivers use totem-pole NOR logic-LOW output indicates OFF state-and support ≥200 mA sink/source at VC = 20 V.

Key Specifications

Pinout & Package

Package: 16-pin narrow-body plastic DIP (DIP16), 7.62 mm pitch, 20.0 × 8.5 mm body size, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with UC3525N and TL494CN, E-SG2525AN delivers tighter reference accuracy, built-in oscillator sync, and simpler deadtime tuning - making it optimal for new designs demanding reliability, thermal stability, and multi-unit coordination.

Availability

E-SG2525AN is available at Aetrix Electronics and suitable for AC-DC adapters, DC-DC buck converters, and push-pull SMPS requiring stable component supply, long-lifecycle assurance, and consistent parametric performance across production batches.

Supply support for E-SG2525AN 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 power management, analog, microcontrollers, and automotive ICs.

The SG2525A series was developed specifically for high-reliability switch-mode power supply control, emphasizing precision reference stability, robust fault handling, and minimal external component count in industrial and telecom power systems.

FAQ

What is the maximum recommended oscillator frequency for E-SG2525AN?

The absolute maximum oscillator frequency is 400 kHz, verified per electrical characteristics table at RT = 2 kΩ, CT = 470 pF, and Tj = 25 °C. Operation above this risks timing inaccuracies due to propagation delays and reduced deadtime margin. For reliable 400 kHz operation, ensure PCB layout minimizes parasitic capacitance on CT and DISCH pins.

How does the E-SG2525AN implement pulse-by-pulse shutdown?

Pulse-by-pulse shutdown is triggered by a short-duration high signal on Pin 10 (SHDN), which immediately resets the PWM latch for that cycle while drawing only 150 µA to discharge the soft-start capacitor partially. This allows current limiting per switching cycle without full latch activation - confirmed in the Shutdown Options section and Figure 5 of the datasheet.

Can E-SG2525AN drive MOSFET gates directly without external buffers?

Yes - each output (Pins 11 and 13) sources/sinks ≥200 mA with <2 V saturation at 100 mA load, enabling direct drive of small-to-medium power MOSFETs (e.g., ≤5 nC gate charge). For larger devices, external gate drivers are still recommended to reduce switching losses and improve rise/fall times.

What is the purpose of the VC pin, and how should it be connected?

Pin 14 (VC) supplies the output driver stage independently from VCC, allowing up to 35 V drive voltage even when VCC is 12 V - critical for driving high-side N-MOSFETs in bootstrap or floating configurations. It must be decoupled with a local 100 nF ceramic capacitor to ground and tied to the same potential as the driver's high-side source or emitter node.