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STMicroelectronics SG2525AN
- Part No.:
- SG2525AN
- Manufacturer:
- STMicroelectronics
- Category:
- DC DC Switching Controllers
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
SG2525AN.pdf
- Description:
- IC REG CTRLR BCK/PUSH-PULL 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:7,003
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Product details
Overview
SG2525AN from STMicroelectronics is a dual-output PWM controller IC designed for regulating switching power supplies, featuring an internal 5.1 V ±1% reference, oscillator frequency range of 100 Hz to 400 kHz, adjustable dead time via external resistor, and built-in soft-start with shutdown latch. It operates from 8–35 V supply and delivers >200 mA source/sink per output in DIP-16 package.
For engineers reviewing the SG2525AN datasheet, SG2525AN pinout, SG2525AN application, or SG2525AN equivalent, key selection criteria include undervoltage lockout hysteresis (≈500 mV), pulse-by-pulse shutdown capability, NOR-logic output polarity (LOW = OFF), and oscillator sync terminal compatibility with multi-unit synchronization.
Technical Context
The SG2525AN integrates a precision error amplifier with rail-to-rail input common-mode range including the 5.1 V reference, eliminating external bias resistors. Its oscillator uses external RT/CT components with discharge control (RD) for wide-frequency tuning and programmable dead time.
A dedicated shutdown pin (Pin 10) controls both PWM latch reset and soft-start capacitor discharge at 150 µA, enabling either instantaneous turn-off or controlled soft-start recycle. The output stage uses totem-pole drivers with NOR logic, ensuring low-state outputs during disable and supporting peak currents up to 400 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 8 V to 35 V - supports wide-input industrial and telecom power supplies without external regulation |
| Reference Voltage | 5.1 V ±1% - enables precise feedback loop calibration without trimming resistors |
| Oscillator Frequency | 100 Hz to 400 kHz - covers flyback, forward, and push-pull topologies with external RT/CT tuning |
| Output Drive Capability | 200 mA sink/source per channel - directly drives gate of power MOSFETs or bipolar transistors |
| Shutdown Response | Pulse-by-pulse + latching modes - allows cycle-by-cycle current limiting and fault hold-off |
| Undervoltage Lockout | 6–8 V threshold with ≈500 mV hysteresis - prevents erratic startup during brownout conditions |
| Operating Temperature | –25 °C to +85 °C - qualified for commercial and industrial ambient environments |
Pinout & Package
SG2525AN is housed in a 16-pin narrow-body plastic DIP (DIP16) package with 2.54 mm pitch, suitable for through-hole PCB assembly and prototyping. Thermal resistance junction-to-pins is 50 °C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (COMP) | Error Amplifier Output | Drives external compensation network; high-impedance node requiring RC filter for stability |
| Pin 2 (INV) | Inverting Input | Connects to feedback divider; referenced to 5.1 V internal reference |
| Pin 3 (NONINV) | Non-Inverting Input | Connected to internal 5.1 V reference; sets error amp common-mode baseline |
| Pin 4 (SYNC) | Oscillator Sync Input | Accepts TTL/CMOS clock signal to synchronize multiple controllers or external system clock |
| Pin 5 (RT) | Oscillator Timing Resistor | Controls oscillator frequency with CT; typical range 2 kΩ–150 kΩ |
| Pin 6 (CT) | Oscillator Timing Capacitor | Works with RT to set frequency; range 0.001 µF–0.1 µF |
| Pin 7 (DISCH) | Oscillator Discharge Terminal | Connects to RD for dead-time adjustment; discharges CT during off-time |
| Pin 8 (SS) | Soft-Start Capacitor | External capacitor sets ramp-up time; charged by internal 25–80 µA current source |
| Pin 9 (REF) | 5.1 V Reference Output | Stable ±1% voltage source; max 20 mA load for feedback and biasing |
| Pin 10 (SHDN) | Shutdown Control | Active-high input; triggers immediate PWM latch reset and soft-start discharge |
| Pin 11 (OUTA) | Output A Driver | NOR-logic totem-pole; LOW = active OFF state; sinks/sources >200 mA |
| Pin 14 (OUTB) | Output B Driver | Complementary to OUTA; supports push-pull or dual-switch configurations |
| Pin 12 (GND) | Power Ground | Common return for all analog and digital circuitry; separate from power ground in layout |
| Pin 13 (VC) | Collector Supply | Provides high-side drive voltage for output transistors; rated up to 35 V |
| Pin 15 (Vi) | Main Supply Input | Primary power input; powers internal logic, reference, and oscillator circuits |
| Pin 16 (VCC) | Logic Supply | Not used on SG2525AN; tied to Vi or left unconnected per datasheet |
Key Features
| Feature | Design Value |
|---|---|
| Internal 5.1 V ±1% reference | Eliminates need for external voltage reference IC or trimming potentiometer in feedback path |
| Adjustable dead time via RD resistor | Prevents shoot-through in half-bridge or full-bridge topologies by controlling overlap between OUTA/OUTB |
| Separate oscillator sync input (Pin 4) | Enables master-slave configuration across multiple SG2525AN units or synchronization to system clock |
| Soft-start with external capacitor | Reduces inrush current and stress on primary-side components during power-up |
| Pulse-by-pulse shutdown with latch | Supports overcurrent protection that resets each cycle unless fault persists, improving reliability |
Applications
| AC-DC Adapter Power Supply | Industrial DC-DC Converter |
|---|---|
Use Scenario: 24 V input, 12 V/5 A isolated output using forward topology with synchronous rectification. IC Role / Device Role / Timing Role: Primary-side PWM controller generating complementary gate drive signals with programmable dead time. Use Value: Internal 5.1 V reference and wide 8–35 V input range simplify feedback design and support universal AC input after rectification. | Use Scenario: 48 V telecom input converted to ±15 V rails for op-amp biasing in factory automation I/O modules. IC Role / Device Role / Timing Role: Dual-output controller managing two independent transformer windings with synchronized timing. Use Value: Oscillator sync terminal allows phase alignment across multiple converters to reduce EMI peaks. |
| Uninterruptible Power Supply (UPS) | Motor Drive Inverter Stage |
Use Scenario: Battery-backed 120 V AC output using push-pull inverter with MOSFET H-bridge. IC Role / Device Role / Timing Role: Gate driver controller providing matched rise/fall times (100 ns/50 ns) and high-current drive. Use Value: Totem-pole outputs sourcing/sinking >200 mA eliminate need for external driver stages. | Use Scenario: 24 V BLDC motor control board requiring variable-frequency PWM for speed regulation. IC Role / Device Role / Timing Role: Low-frequency (<10 kHz) PWM generator with adjustable duty cycle and soft-start ramp. Use Value: Undervoltage lockout with 500 mV hysteresis ensures clean restart after battery sag during motor stall. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SG3525AN | Same architecture but rated for 0–70 °C ambient; 5.0–5.2 V reference (vs. 5.05–5.15 V for SG2525AN) | Targeted at commercial-grade systems; lacks extended temperature qualification | Select when cost sensitivity outweighs industrial temp requirement and tighter reference tolerance |
| UC3525N | Pin-compatible Texas Instruments variant; identical functional block diagram but different thermal specs (RθJA = 65 °C/W vs. 50 °C/W) | Used in legacy TI-based designs; same oscillator and shutdown behavior | Choose for drop-in replacement where TI sourcing preference or existing BOM alignment applies |
Compared with SG3525AN and UC3525N, the SG2525AN offers tighter reference accuracy (±1% vs. ±2%), wider operating temperature (–25 °C to +85 °C), and lower thermal resistance-making it preferable for industrial power supplies requiring long-term stability under thermal stress.
Availability
SG2525AN is available at Aetrix Electronics and suitable for AC-DC adapters, industrial DC-DC converters, and uninterruptible power supplies requiring stable component supply and long-lifecycle availability.
Supply support for 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 belongs to ST's legacy power control product line, engineered specifically for discrete and hybrid switching power supply designs requiring high noise immunity, robust fault handling, and minimal external component count.
FAQ
What is the difference between SG2525AN and SG3525AN?
The SG2525AN is specified for –25 °C to +85 °C operation and features a tighter 5.1 V ±1% reference (5.05–5.15 V), while the SG3525AN is rated for 0–70 °C and has a 5.0–5.2 V reference. Both share identical pinout, oscillator architecture, and functional blocks, but SG2525AN targets industrial environments requiring extended temperature and precision.
Can SG2525AN drive MOSFET gates directly?
Yes-each output delivers >200 mA sink/source capability with fast rise/fall times (100 ns/50 ns into 1 nF), enabling direct drive of small-to-medium power MOSFETs. For high-Ciss devices or high-frequency operation (>200 kHz), a gate driver buffer is recommended to ensure clean switching edges.
How is dead time adjusted on SG2525AN?
Dead time is set by connecting a resistor (RD) between Pin 7 (DISCH) and Pin 6 (CT). Increasing RD lengthens the discharge time of CT, delaying the start of the next oscillator cycle and creating non-overlapping intervals between OUTA and OUTB. Typical RD values range from 0 Ω to 500 Ω for 0.5–5 µs dead time.
Does SG2525AN support synchronous rectification control?
No-SG2525AN generates complementary PWM outputs but lacks dedicated synchronous rectifier control logic (e.g., adaptive timing, VDS sensing, or SR gate delay adjustment). It can be used in synchronous designs only with external timing logic or auxiliary controllers to manage SR FET timing relative to main switches.
SG2525AN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Down, Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck, Push-Pull
- Number of Outputs:
- 2
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 8V ~ 35V
- Frequency - Switching:
- 100Hz ~ 400kHz
- Duty Cycle (Max):
- 49%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Enable, Soft Start
- Operating Temperature:
- -25°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-DIP
SG2525AN FAQ
1.How can I place an order for SG2525AN through Aetrix?
Please submit a Request for Quotation (RFQ) for SG2525AN on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SG2525AN reliable?
The price and inventory of SG2525AN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SG2525AN is usually 5 days.
3.What payment methods are accepted for SG2525AN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SG2525AN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SG2525AN?
SG2525AN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SG2525AN order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SG2525AN?
For technical support, including SG2525AN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SG2525AN requirements.
6.How does Aetrix verify that SG2525AN is sourced from the original manufacturer or authorized distributors?
All SG2525AN products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SG2525AN meets industry standards.
7.What is the process for return or replacement of SG2525AN?
All SG2525AN units undergo pre-shipment inspection (PSI). If there is an issue with SG2525AN, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SG2525AN part is unused and in its original packaging.
Return procedure for SG2525AN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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