STMicroelectronics SG3524P013TR

Overview

SG3524P013TR from STMicroelectronics is a fixed-frequency PWM controller IC with dual uncommitted transistor outputs, 5 V ±1% reference voltage, 300 kHz max switching frequency, and 8 mA typical standby current-designed for single-ended or push-pull DC-DC converters, inverters, and polarity converters.

For engineers reviewing the SG3524P013TR datasheet, SG3524P013TR pinout, SG3524P013TR application, or SG3524P013TR equivalent, key selection criteria include oscillator timing tolerance (±5%), output saturation voltage (1–2 V at 50 mA), temperature-stable reference (≤1% ∆VREF/∆T), and current-limit sense threshold (180–220 mV).

Technical Context

The SG3524P013TR integrates a programmable oscillator (RT/CT-controlled), error amplifier with 3 MHz bandwidth and 60–80 dB open-loop gain, high-gain comparator, pulse-steering flip-flop, and on-chip 5 V reference regulator. It supports synchronous operation via external clock injection at Pin 3.

Its dual alternating outputs enable push-pull topology (half-oscillator frequency) or paralleled single-ended mode (full oscillator frequency), with blanking pulse width controlled by CT value to prevent shoot-through. Current-limit shutdown is triggered at 180–220 mV across the sense resistor.

Key Specifications

Pinout & Package

SG3524P013TR is supplied in a 16-pin SOIC narrow-body package (SO16), 3.9 mm body width, 1.27 mm pitch, with thermal resistance R_{th j-amb} = 50 °C/W when soldered to alumina substrate.

Key Features

Applications

Equivalent & Alternatives

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

Compared with UC3524N and TL494CN, SG3524P013TR offers superior reference stability and lower quiescent current but lacks programmable dead time and extended temperature rating-making it optimal for cost-sensitive, fixed-frequency, commercial-grade DC-DC converters.

Availability

SG3524P013TR is available at Aetrix Electronics and suitable for flyback converters, push-pull DC-DC supplies, voltage doublers, and polarity inverters requiring stable component supply and long-lifecycle support.

Supply support for SG3524P013TR 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, designing and manufacturing analog, power, MCU, and sensor solutions for automotive, industrial, and consumer markets.

The SG3524 product line targets discrete-switching power supply design, emphasizing integration of oscillator, reference, error amplifier, and dual-output drivers in a single monolithic IC for cost-effective, reliable regulation.

FAQ

What is the maximum allowable timing capacitor (CT) value for stable operation?

The datasheet specifies CT between 0.001 µF and 0.1 µF. Using CT > 0.1 µF risks oscillator instability due to increased leakage and parasitic effects, especially above 70°C. At 0.1 µF and RT = 100 kΩ, frequency drops to ~120 Hz-still within spec-but requires careful PCB layout to minimize stray capacitance at Pin 4.

Can SG3524P013TR drive MOSFETs directly?

No-it features uncommitted NPN transistor outputs (QA/QB) rated for 100 mA collector current and 40 V V_CE. Direct MOSFET gate drive requires external gate drivers or discrete buffer transistors to supply required peak current and voltage swing; QA/QB serve as level-shifted, current-limited switches-not logic-level drivers.

How does the blanking pulse prevent shoot-through in push-pull mode?

The oscillator output (Pin 3) generates a blanking pulse whose width scales with CT value. This pulse disables both QA and QB outputs during switching transitions, enforcing dead time. For CT = 0.01 µF, blanking is ~0.5 µs-sufficient to allow external transistors to fully turn off before the complementary device turns on, preventing simultaneous conduction.

Is the 5 V reference usable as a precision ADC reference?

No-the 5 V reference has ±1% initial tolerance and 0.3–1% temperature drift over 0–70°C, plus 20 mV long-term drift after 1000 hours at 125°C. It is intended for internal biasing and feedback scaling, not metrology-grade conversion. For ADC references, use dedicated bandgap ICs like REF5050 with <0.05% tolerance and 5 ppm/°C drift.