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STMicroelectronics SG3525AP
- Part No.:
- SG3525AP
- Manufacturer:
- STMicroelectronics
- Category:
- DC DC Switching Controllers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SG3525AP.pdf
- Description:
- IC REG CTRLR BCK/PSH-PULL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:966
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Product details
Overview
SG3525AP from STMicroelectronics is a dual-output PWM controller IC designed for regulating switching power supplies in forward, push-pull, and half-bridge topologies. It features a trimmed 5.1 V ±1% reference, 100 Hz–400 kHz oscillator range, adjustable deadtime control via external resistor, internal soft-start, and pulse-by-pulse shutdown. Used in industrial DC-DC converters requiring precise duty-cycle control and robust fault protection.
For engineers reviewing the SG3525AP datasheet, SG3525AP pinout, SG3525AP application, or SG3525AP equivalent, key selection criteria include oscillator frequency adjustability (RT/CT), undervoltage lockout hysteresis (≈500 mV), NOR-logic output stage (LOW = OFF), latch-based PWM termination, and dual 200+ mA source/sink drivers for gate driving.
Technical Context
The SG3525AP integrates a precision error amplifier with rail-to-rail input common-mode range (including 5.1 V reference), enabling direct feedback without external level-shifting resistors. Its oscillator supports synchronization via dedicated SYNC pin and allows wide-frequency tuning using RT, CT, and RD components.
Shutdown is implemented through a dual-path architecture: Pin 10 triggers immediate PWM latch reset and initiates 150 µA soft-start capacitor discharge, supporting both pulse-by-pulse current limiting and full soft-start recycle. Undervoltage lockout (6–8 V threshold with ≈500 mV hysteresis) disables outputs and discharges soft-start capacitor during sub-normal supply conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 5.1 V ±1% - enables accurate error amplifier setpoint without external trimming |
| Oscillator Range | 100 Hz to 400 kHz - supports low-noise audio-grade supplies and high-efficiency SMPS |
| Output Drive | 200 mA sink/source per channel - directly drives MOSFET gates without external buffers |
| Deadtime Control | Adjustable via single resistor (0–500 Ω) between CT and DISCHARGE - prevents shoot-through in bridge topologies |
| UVLO Threshold | 6–8 V with ≈500 mV hysteresis - ensures clean startup/shutdown without oscillation near brownout |
| Soft-Start Current | 25–80 µA - sets ramp time with external capacitor; enables controlled inrush current management |
| PWM Latch | Single-cycle hold-off after comparator trip - guarantees one pulse per clock cycle, preventing multiple pulses |
Pinout & Package
SG3525AP is available in 16-pin narrow-body plastic DIP (DIP16) package with 2.54 mm lead pitch, rated for 0–70 °C ambient operation and 1000 mW max power dissipation at 70 °C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (INV) | Inverting input of error amplifier | Accepts feedback voltage; referenced to 5.1 V internal reference |
| 2 (NINV) | Non-inverting input of error amplifier | Connects to internal 5.1 V reference or external setpoint |
| 3 (COMP) | Error amplifier output / compensation node | External RC network sets loop stability and bandwidth |
| 4 (OSC) | Oscillator timing output | Provides sawtooth waveform; used for slope compensation in current-mode designs |
| 5 (CT) | Oscillator timing capacitor connection | Charges via internal current mirror; sets oscillator frequency with RT |
| 6 (RT) | Oscillator timing resistor connection | Sets charging current; combined with CT determines fosc |
| 7 (DISCH) | Oscillator discharge terminal | Connected to CT via RD to adjust deadtime |
| 8 (SS) | Soft-start capacitor connection | External capacitor ramps up PWM duty cycle at power-on |
| 9 (REF) | 5.1 V reference output | Stable ±1% voltage source for biasing and sensing |
| 10 (SHDN) | Active-high shutdown control | Triggers immediate PWM latch reset and soft-start discharge |
| 11 (OUTA) | Output A driver (NOR logic) | LOW = active; sinks or sources >200 mA for gate drive |
| 14 (OUTB) | Output B driver (NOR logic) | Complementary to OUTA in push-pull mode; phase-controlled |
| 12 (GND) | Power ground | Common return for logic, oscillator, and output stages |
| 13 (VC) | Collector supply for output drivers | Separate 4.5–35 V rail for high-side drive capability |
| 15 (Vi) | Main supply input | 8–35 V input powering internal logic, reference, and oscillator |
| 16 (SYNC) | Oscillator synchronization input | Accepts external clock or slaved signal for multi-controller coordination |
Key Features
| Feature | Design Value |
|---|---|
| Internal 5.1 V reference trimmed to ±1% | Eliminates need for external voltage reference IC or trimming potentiometer |
| Adjustable deadtime via single external resistor | Prevents cross-conduction in half-bridge and full-bridge configurations without complex circuitry |
| Pulse-by-pulse shutdown with latch | Enables cycle-by-cycle current limiting while maintaining stable oscillator timing |
| Dual totem-pole outputs with 200+ mA drive | Directly interfaces with power MOSFETs or IGBTs without gate driver ICs |
| Undervoltage lockout with 500 mV hysteresis | Ensures glitch-free startup and shutdown under marginal input conditions |
Applications
| Industrial DC-DC Converters | Half-Bridge SMPS |
|---|---|
Use Scenario: 24 V input to 12 V/10 A isolated DC-DC converter in factory automation PLC power modules. IC Role / Device Role / Timing Role: Primary-side PWM controller generating complementary gate drive signals with programmable deadtime. Use Value: Internal 5.1 V reference and integrated soft-start reduce component count by 3–5 parts versus discrete solutions. | Use Scenario: 48 V telecom rectifier supplying 5 V/30 A to server backplanes. IC Role / Device Role / Timing Role: Dual-output controller managing high-side/low-side MOSFET timing with synchronized oscillator. Use Value: 200 mA output drive eliminates need for external gate drivers, reducing layout complexity and EMI. |
| Push-Pull Power Supplies | Programmable Lab Power Supplies |
Use Scenario: 12 V battery-powered 200 W push-pull inverter for portable medical imaging equipment. IC Role / Device Role / Timing Role: Regulating PWM generator with UVLO and pulse-by-pulse shutdown for overcurrent protection. Use Value: Built-in latch and shutdown path enable fast (<0.5 µs) fault response without external comparators. | Use Scenario: Benchtop 0–30 V/0–5 A linear + switching hybrid supply with digital setpoint interface. IC Role / Device Role / Timing Role: Core PWM modulator accepting analog error signal from DAC-controlled feedback loop. Use Value: Error amplifier input range includes 5.1 V reference, allowing direct DAC output connection without level shift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UC3525AN | Same pinout and functional block diagram; ±2% reference tolerance vs. ±1% on SG3525AP | Lacks internal soft-start current source; requires external transistor for soft-start control | Preferred where cost sensitivity outweighs reference accuracy and integrated soft-start convenience |
| TL494CN | Fixed 5 V reference (±5%), no sync input, single-ended output configuration, no dedicated deadtime pin | Requires external logic for complementary outputs; limited to lower-frequency (<200 kHz) designs | Selected when only basic PWM functionality is needed and board space permits discrete deadtime generation |
Compared with UC3525AN and TL494CN, the SG3525AP delivers tighter reference accuracy, integrated soft-start current source, and dedicated SYNC/DEADTIME pins-enabling faster design iteration, reduced BOM count, and higher reliability in regulated industrial power supplies.
Availability
SG3525AP is available at Aetrix Electronics and suitable for industrial DC-DC converters, half-bridge SMPS, and push-pull power supplies requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.
Supply support for SG3525AP 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, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.
The SG3525A series belongs to ST's legacy power management IC portfolio, engineered specifically for high-reliability offline and DC-DC switching power supply control with emphasis on integration, thermal robustness, and fault resilience.
FAQ
What is the maximum recommended operating frequency for SG3525AP?
The SG3525AP supports oscillator frequencies up to 400 kHz under recommended conditions (RT = 2 kΩ, CT = 470 pF). At higher frequencies, propagation delays and output rise/fall times (100–600 ns) may limit minimum achievable deadtime and duty-cycle resolution. Operation beyond 400 kHz is not guaranteed per datasheet specifications.
How does the SG3525AP implement pulse-by-pulse shutdown?
Pulse-by-pulse shutdown is achieved via the internal PWM latch: when the shutdown pin (Pin 10) is asserted, the latch immediately resets the output state and halts further PWM pulses for that cycle. The latch remains reset until the next oscillator clock edge, ensuring exactly one disabled cycle per shutdown event-ideal for current-limiting schemes.
Can SG3525AP drive MOSFETs directly without external gate drivers?
Yes-each output (Pins 11 and 14) sources or sinks ≥200 mA with <0.4 V saturation at 20 mA load, enabling direct drive of small-to-medium power MOSFETs (Qg < 20 nC). For high-Qg devices (>30 nC) or high-frequency operation (>200 kHz), external gate drivers are recommended to ensure fast turn-on/turn-off and minimize switching losses.
What is the purpose of the VC pin (Pin 13) and how should it be connected?
Pin 13 (VC) supplies independent power to the output driver stage, allowing operation up to 35 V regardless of main supply (Vi). It must be decoupled with a local 100 nF ceramic capacitor to GND. In single-ended configurations, VC connects to Vi; in push-pull/half-bridge, it may be tied to a separate rail for optimized high-side drive margin.
SG3525AP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
SG3525AP FAQ
1.How can I place an order for SG3525AP through Aetrix?
Please submit a Request for Quotation (RFQ) for SG3525AP 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 SG3525AP reliable?
The price and inventory of SG3525AP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SG3525AP is usually 5 days.
3.What payment methods are accepted for SG3525AP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SG3525AP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SG3525AP?
SG3525AP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SG3525AP 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 SG3525AP?
For technical support, including SG3525AP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SG3525AP requirements.
6.How does Aetrix verify that SG3525AP is sourced from the original manufacturer or authorized distributors?
All SG3525AP 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 SG3525AP meets industry standards.
7.What is the process for return or replacement of SG3525AP?
All SG3525AP units undergo pre-shipment inspection (PSI). If there is an issue with SG3525AP, 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 SG3525AP part is unused and in its original packaging.
Return procedure for SG3525AP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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