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STMicroelectronics E-SG3525AP
- Part No.:
- E-SG3525AP
- Manufacturer:
- STMicroelectronics
- Category:
- DC DC Switching Controllers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
E-SG3525AP.pdf
- Description:
- IC REG CTRLR BCK/PSH-PULL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,646
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Product details
Overview
E-SG3525AP 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 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. Its totem-pole outputs source/sink >200 mA and operate from 8–35 V supply.
For engineers reviewing the E-SG3525AP datasheet, E-SG3525AP pinout, E-SG3525AP application, or E-SG3525AP equivalent, key selection criteria include oscillator frequency adjustability, undervoltage lockout hysteresis (≈500 mV), NOR-logic output polarity, latch-based PWM safety, and compatibility with push-pull, half-bridge, and forward converter topologies.
Technical Context
The E-SG3525AP integrates a precision error amplifier with rail-to-rail common-mode input range (including the 5.1 V reference), eliminating external bias resistors. Its oscillator supports synchronization via dedicated SYNC pin and allows wide-frequency tuning using RT/CT/RD components with defined discharge timing.
It implements a latch after the PWM comparator to prevent multiple pulses per cycle, resets on each clock edge, and combines shutdown control over both PWM latch and soft-start capacitor discharge - enabling either instantaneous turn-off or controlled recycle based on signal duration at Pin 10.
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 feedback loop setpoint without external trimming |
| Oscillator Frequency | 100 Hz to 400 kHz - covers low-noise audio-range and high-efficiency high-frequency designs |
| Output Drive Capability | 200 mA sink/source per output - directly drives gate of MOSFETs up to ~1 nF input capacitance |
| Undervoltage Lockout | 6–8 V threshold with ≈500 mV hysteresis - prevents erratic startup during brownout conditions |
| Shutdown Response | Pulse-by-pulse or latched via Pin 10 - supports current limiting and controlled soft-restart |
| Operating Temperature | 0 °C to 70 °C - rated for commercial-grade power supply environments |
Pinout & Package
E-SG3525AP is packaged in a 16-pin narrow-body plastic DIP (DIP16) with 0.3-inch width and 2.54 mm pitch. Pin 1 is located at the left end of the top row when viewed from above with notch or dot oriented upward.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (INV) | Inverting input of error amplifier | Accepts feedback voltage for closed-loop regulation; referenced to internal 5.1 V |
| Pin 2 (NINV) | Non-inverting input of error amplifier | Connected to internal 5.1 V reference; enables single-resistor feedback configuration |
| Pin 3 (COMP) | Error amplifier output / compensation node | External RC network sets loop stability; also functions as soft-start ramp node |
| Pin 4 (OSC) | Oscillator sync input | Allows master-slave synchronization or external clock injection for noise reduction |
| Pin 5 (CT) | Oscillator timing capacitor connection | Charges/discharges to set oscillator frequency; used with RT and RD for precise timing |
| Pin 6 (RT) | Oscillator timing resistor connection | Sets charging current; combined with CT determines base frequency (f ≈ 1/(CT × 0.7RT)) |
| Pin 7 (DISCH) | Oscillator discharge resistor connection | Controls dead time by adjusting discharge rate; 0–500 Ω range yields practical dead-time adjustment |
| Pin 8 (SS) | Soft-start capacitor connection | External capacitor sets startup ramp time; discharged during shutdown for controlled restart |
| Pin 9 (REF) | 5.1 V reference output | Stable ±1% voltage source for sensor biasing or auxiliary circuitry; max 20 mA load |
| Pin 10 (SHDN) | Active-high shutdown control | Short pulse disables PWM instantly; longer pulse discharges SS cap for soft-restart |
| Pin 11 (OUTA) | Output A driver (NOR logic) | Drives external switch; LOW = active OFF state; 200 mA sink/source capability |
| Pin 12 (GND) | Power ground | Common return for logic, oscillator, and reference circuits |
| Pin 13 (VC) | Collector supply for output drivers | Separate supply for output stage; supports up to 35 V for high-side drive applications |
| Pin 14 (OUTB) | Output B driver (NOR logic) | Complementary to OUTA in push-pull mode; identical drive strength and logic polarity |
| Pin 15 (Vi) | Main supply input | Primary power input for internal circuitry; 8–35 V operation with UVLO protection |
| Pin 16 (VCC) | Logic supply (tied to Vi internally) | Not externally connected; internal connection ensures consistent logic-level referencing |
Key Features
| Feature | Design Value |
|---|---|
| Dual totem-pole outputs with NOR logic | Ensures predictable LOW-active output state and eliminates need for external inverters in standard configurations |
| Adjustable dead time via single resistor (RD) | Prevents shoot-through in bridge topologies by setting minimum off-time between complementary outputs |
| Internal 5.1 V ±1% reference with 20 mA drive | Reduces component count by powering sensors, ADC references, or optocoupler LEDs directly |
| Pulse-by-pulse shutdown with latch reset | Enables cycle-by-cycle current limiting without disrupting soft-start sequence or oscillator timing |
| Sync-capable oscillator with hysteresis-enhanced UVLO | Supports multi-phase interleaving and improves reliability during line transients or cold starts |
Applications
| Industrial AC-DC Power Supplies | Telecom DC-DC Converters |
|---|---|
Use Scenario: 48 V input to ±15 V/5 V isolated outputs for base station power modules. IC Role / Device Role / Timing Role: Primary-side PWM controller generating complementary gate signals for forward converter with synchronous rectification. Use Value: Adjustable dead time prevents cross-conduction in high-current secondary-side FETs; 400 kHz max frequency enables compact magnetics. | Use Scenario: 36–72 V telecom input converted to 12 V intermediate bus feeding POL regulators. IC Role / Device Role / Timing Role: Regulating pulse-width modulator controlling primary-side MOSFETs in half-bridge topology. Use Value: Internal 5.1 V reference powers optocoupler feedback circuit; UVLO hysteresis avoids oscillation during brownout recovery. |
| Programmable Lab Power Supplies | Motor Drive Gate Drivers |
Use Scenario: Benchtop 0–30 V / 0–5 A adjustable output with digital setpoint and analog feedback. IC Role / Device Role / Timing Role: Core PWM generator synchronized to external microcontroller clock for deterministic ripple reduction. Use Value: OSC sync pin enables phase-aligned switching across multiple channels; soft-start prevents inrush into capacitive loads. | Use Scenario: 24 V-powered H-bridge driver for BLDC motor commutation in HVAC blowers. IC Role / Device Role / Timing Role: Dual-output PWM controller driving high-side and low-side N-channel MOSFETs with dead-time insertion. Use Value: External RD resistor sets precise dead time to avoid shoot-through; output drive strength supports 1 nF gate charge at 100 kHz. |
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 architecture; ±2% reference tolerance vs. ±1% in E-SG3525AP | Lacks hysteresis in UVLO (typ. 300 mV vs. 500 mV); lower oscillator accuracy (±6% vs. ±2%) | Select when cost sensitivity outweighs precision requirements and thermal stability is less critical |
| TL494CN | Single-ended output architecture; no dedicated SYNC pin; fixed 2.5 V reference | Requires external level-shifting for high-side drive; no built-in soft-start capacitor discharge path | Choose for simpler, lower-cost flyback or single-switch topologies where dual outputs and synchronization are unnecessary |
Compared with UC3525AN and TL494CN, the E-SG3525AP delivers tighter reference accuracy, higher oscillator stability, and integrated soft-start discharge control - making it preferable for high-reliability industrial and telecom SMPS requiring precise timing, robust fault response, and multi-unit synchronization.
Availability
E-SG3525AP is available at Aetrix Electronics and suitable for industrial AC-DC power supplies, telecom DC-DC converters, and programmable lab power supplies requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for E-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, Switzerland, specializing in power management, analog, microcontrollers, and automotive ICs.
The SG3525A series was developed specifically for high-performance switching power supply control, emphasizing precision regulation, thermal robustness, and minimal external component count in industrial and telecom infrastructure.
FAQ
What is the function of Pin 7 (DISCH) in E-SG3525AP?
Pin 7 connects to the oscillator discharge resistor (RD), which controls the discharge time of the CT capacitor and thereby sets the dead time between complementary output pulses. A typical RD value of 10–100 Ω yields 100–500 ns dead time, preventing shoot-through in bridge configurations. The datasheet specifies RD range as 0–500 Ω for full adjustability.
Does E-SG3525AP support synchronous rectification control?
No - E-SG3525AP does not generate dedicated synchronous rectifier drive signals. Its dual outputs are designed for primary-side switching (e.g., push-pull, half-bridge). Synchronous rectification requires separate timing control or external logic, as the IC lacks dedicated SR gate drive outputs or adaptive timing for secondary-side FETs.
Can E-SG3525AP operate with a 5 V supply?
No - the absolute minimum supply voltage is 8 V per datasheet specifications. Operation below 8 V triggers undervoltage lockout, disabling outputs and discharging the soft-start capacitor. Attempting 5 V operation results in non-functional behavior, including no oscillator start-up and zero output drive.
How is the oscillator frequency calculated for E-SG3525AP?
The oscillator frequency is approximated by f = 1 / [CT × (0.7 × RT + 3 × RD)], where CT is in farads, RT in ohms, and RD in ohms. For example, with RT = 3.6 kΩ, CT = 10 nF, and RD = 0 Ω, f ≈ 40 kHz. This formula accounts for both charging (via RT) and discharging (via RD) paths in the oscillator timing network.
E-SG3525AP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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
E-SG3525AP FAQ
1.How can I place an order for E-SG3525AP through Aetrix?
Please submit a Request for Quotation (RFQ) for E-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 E-SG3525AP reliable?
The price and inventory of E-SG3525AP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for E-SG3525AP is usually 5 days.
3.What payment methods are accepted for E-SG3525AP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for E-SG3525AP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for E-SG3525AP?
E-SG3525AP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your E-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 E-SG3525AP?
For technical support, including E-SG3525AP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your E-SG3525AP requirements.
6.How does Aetrix verify that E-SG3525AP is sourced from the original manufacturer or authorized distributors?
All E-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 E-SG3525AP meets industry standards.
7.What is the process for return or replacement of E-SG3525AP?
All E-SG3525AP units undergo pre-shipment inspection (PSI). If there is an issue with E-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 E-SG3525AP part is unused and in its original packaging.
Return procedure for E-SG3525AP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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