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STMicroelectronics SG2525AP
- Part No.:
- SG2525AP
- Manufacturer:
- STMicroelectronics
- Category:
- DC DC Switching Controllers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SG2525AP.pdf
- Description:
- IC REG CTRLR BCK/PSH-PULL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,038
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Product details
Overview
SG2525AP from STMicroelectronics is a dual-output PWM controller IC designed for regulating switching power supplies in industrial and telecom DC-DC converters. It features a 5.1 V ±1% trimmed reference, 100 Hz–400 kHz oscillator range, adjustable deadtime control via external resistor, internal soft-start, and pulse-by-pulse shutdown. Its totem-pole output drivers source/sink >200 mA and operate from 8–35 V supply.
For engineers reviewing the SG2525AP datasheet, SG2525AP pinout, SG2525AP application, or SG2525AP equivalent, key selection criteria include oscillator frequency stability over temperature (±6% max), shutdown threshold (0.6–1 V), error amplifier gain-bandwidth (1–2 MHz), and output driver saturation voltage at 100 mA sink (1–2 V).
Technical Context
The SG2525AP integrates a precision 5.1 V bandgap reference with ±1% initial tolerance and ≤50 mV total variation across line/load/temperature. Its oscillator uses an external RT/CT network with discharge control (RD) enabling precise frequency and deadtime tuning per the formula f = 1 / [CT × (0.7×RT + 3×RD)].
The PWM architecture includes a latch after the comparator that holds outputs low for the full clock period once triggered-ensuring single-pulse termination-and NOR-logic outputs that drive low during OFF states. Undervoltage lockout (6–8 V threshold with ~500 mV hysteresis) disables outputs and discharges the soft-start capacitor under sub-normal input conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 8 V to 35 V - supports wide-input industrial SMPS without pre-regulation |
| Reference Voltage | 5.1 V ±1% - enables accurate error amplifier setpoint without external trimming |
| Oscillator Frequency | 100 Hz to 400 kHz - covers flyback, forward, and push-pull topologies up to 200 kHz switching |
| Output Drive Capability | 200 mA sink/source - directly drives gate of MOSFETs up to 1 A peak current with <100 ns rise/fall |
| Shutdown Threshold | 0.6 V to 1.0 V - compatible with logic-level signals and analog current-limit comparators |
| Soft-Start Current | 25 µA to 80 µA - sets ramp time with external capacitor; enables controlled inrush limiting |
| UVLO Threshold | 6 V to 8 V with 500 mV hysteresis - prevents erratic startup during brownout or slow-rising rails |
Pinout & Package
SG2525AP is supplied in a 16-pin narrow-body plastic DIP (DIP16) package with 2.54 mm pitch, rated for –25°C to +85°C ambient operation and 1000 mW power dissipation at 70°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (INV) | Inverting input of error amplifier | Connects to feedback divider; sets regulation point via voltage comparison against 5.1 V reference |
| 2 (NINV) | Non-inverting input of error amplifier | Tied to 5.1 V reference; establishes error amp common-mode baseline |
| 8 (SS) | Soft-start timing node | Charged by internal 50 µA current source; controls PWM duty ramp-up at power-on |
| 9 (COMP) | Error amplifier output / compensation node | External RC network sets loop stability; drives PWM comparator input |
| 10 (SHDN) | Active-low shutdown control | Pull below 1 V to latch off outputs and discharge SS capacitor; enables pulse-by-pulse current limiting |
| 11 & 14 (OUTA/OUTB) | Dual totem-pole PWM outputs | NOR-logic outputs: low = active drive; high = high-impedance; each sources/sinks >200 mA |
| 13 (VC) | Collector supply for output transistors | Independent 4.5–35 V rail for output stage; decouples driver supply from logic supply |
| 16 (Vi) | Main supply input | 8–35 V input powering internal logic, reference, and oscillator; feeds UVLO circuit |
Key Features
| Feature | Design Value |
|---|---|
| Trimmed 5.1 V reference | ±1% initial accuracy eliminates need for external calibration resistors in feedback networks |
| Adjustable deadtime control | Single external resistor between CT and DISCHARGE pins sets non-overlap time between OUTA/OUTB |
| Internal soft-start | Controlled ramp-up of duty cycle prevents transformer saturation and inrush current spikes |
| Pulse-by-pulse shutdown | Each oscillator cycle resets the PWM latch-enabling cycle-by-cycle current limiting without external logic |
| Sync input terminal | Allows master-slave configuration or synchronization to external clock for EMI reduction |
Applications
| Telecom DC-DC Converters | Industrial AC-DC Power Supplies |
|---|---|
Use Scenario: 48 V input telecom rectifier supplying isolated 3.3 V/12 V rails to line cards. IC Role / Device Role / Timing Role: Primary-side PWM controller generating complementary gate drives for push-pull topology with automatic reset during dead time. Use Value: 400 kHz max oscillator frequency enables compact magnetics; 5.1 V reference ensures tight output regulation across temperature. | Use Scenario: 3-phase industrial motor drive auxiliary power supply converting 380 VAC to 24 VDC for control logic. IC Role / Device Role / Timing Role: Regulating forward-converter controller with UVLO hysteresis preventing restart chatter during undervoltage events. Use Value: 500 mV UVLO hysteresis ensures stable operation during grid sags; dual outputs simplify gate drive for synchronous rectification. |
| Programmable Lab Power Supplies | LED Driver Modules |
Use Scenario: Bench power supply with digitally adjustable 0–30 V, 0–5 A output using DAC-controlled feedback. IC Role / Device Role / Timing Role: Precision PWM modulator accepting analog voltage command on COMP pin for linear output control. Use Value: Error amplifier CMRR ≥60 dB rejects noise from digital control circuits; 1–2 MHz GBW supports fast transient response. | Use Scenario: Constant-current LED driver for street lighting using half-bridge topology with isolated feedback. IC Role / Device Role / Timing Role: High-side/lower-side gate driver controller with adjustable deadtime to prevent shoot-through in bridge legs. Use Value: External RD resistor sets precise deadtime; output drivers sink 200 mA to rapidly discharge MOSFET gates and reduce conduction losses. |
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% in SG2525AP | Lower reference accuracy requires tighter feedback resistor tolerances for same output regulation | Select when cost sensitivity outweighs ±1% reference requirement and legacy UCx design reuse is prioritized |
| TL5001CP | Single-ended output only; no dual complementary outputs or sync input; 1% reference but no deadtime control | Lacks push-pull or half-bridge support; limited to flyback or boost topologies | Choose only for low-complexity, single-switch SMPS where dual outputs and deadtime adjustment are unnecessary |
Compared with UC3525AN and TL5001CP, the SG2525AP delivers superior reference accuracy (±1%), integrated deadtime tuning, and dual-NOR outputs-making it optimal for high-reliability push-pull, forward, and half-bridge converters requiring precise timing control and robust fault handling.
Availability
SG2525AP is available at Aetrix Electronics and suitable for telecom DC-DC converters, industrial AC-DC power supplies, and programmable lab power supplies requiring stable component supply and long-term industrial-grade availability.
Supply support for SG2525AP 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, analog chips, and sensors for automotive, industrial, and consumer markets.
The SG2525A series belongs to ST's legacy analog power management portfolio, developed specifically for high-efficiency, discrete-based switching power supplies where precision regulation, thermal robustness, and layout simplicity are critical.
FAQ
What is the maximum allowable oscillator frequency for SG2525AP?
The SG2525AP supports up to 400 kHz oscillator frequency, achieved with RT = 2 kΩ and CT = 470 pF. This limit is specified in the Electrical Characteristics table and verified across temperature; exceeding it risks timing inaccuracies and reduced deadtime margin due to propagation delays in internal logic paths.
How does the shutdown function interact with soft-start?
A short pulse on SHDN (Pin 10) latches off outputs immediately while minimally discharging the soft-start capacitor-enabling pulse-by-pulse current limiting. A sustained high signal fully discharges the capacitor, forcing a full soft-start recycle upon release, ensuring controlled re-entry into regulation.
Can SG2525AP drive MOSFET gates directly without external buffers?
Yes-the totem-pole outputs source/sink >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 recommended to maintain <100 ns switching transitions and minimize Miller plateau effects.
What is the purpose of the VC pin, and how should it be decoupled?
VC (Pin 13) supplies the collector of the output transistors independently from the logic supply (Vi). It must be decoupled with a low-ESR 10 µF ceramic capacitor placed within 5 mm of the pin to suppress switching noise and prevent output stage oscillation during high-current transitions.
SG2525AP 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:
- -25°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
SG2525AP FAQ
1.How can I place an order for SG2525AP through Aetrix?
Please submit a Request for Quotation (RFQ) for SG2525AP 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 SG2525AP reliable?
The price and inventory of SG2525AP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SG2525AP is usually 5 days.
3.What payment methods are accepted for SG2525AP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SG2525AP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SG2525AP?
SG2525AP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SG2525AP 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 SG2525AP?
For technical support, including SG2525AP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SG2525AP requirements.
6.How does Aetrix verify that SG2525AP is sourced from the original manufacturer or authorized distributors?
All SG2525AP 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 SG2525AP meets industry standards.
7.What is the process for return or replacement of SG2525AP?
All SG2525AP units undergo pre-shipment inspection (PSI). If there is an issue with SG2525AP, 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 SG2525AP part is unused and in its original packaging.
Return procedure for SG2525AP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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