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Microchip Technology SG3524BDW-TR
- Part No.:
- SG3524BDW-TR
- Manufacturer:
- Microchip Technology
- Category:
- DC DC Switching Controllers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SG3524BDW-TR.pdf
- Description:
- IC REG CTRLR BUCK
- Quantity:
- Payment:
- Shipping:
Inventory:3,307
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Product details
Overview
SG3524BDW-TR from Microsemi is a regulating pulse width modulator IC designed for switching power supplies, delivering 5 V reference trimmed to ±1%, 100 Hz–400 kHz oscillator range, dual 100 mA output transistors, and undervoltage lockout at 4.2–4.9 V. It operates across 0 °C to 70 °C ambient temperature in a 16-pin SOWB package and is used in DC-DC converters requiring stable duty-cycle control.
For engineers reviewing the SG3524BDW-TR datasheet, SG3524BDW-TR pinout, SG3524BDW-TR application, or SG3524BDW-TR equivalent, this page provides verified technical context, exact pin functions, real-world use scenarios, and two confirmed alternative parts with documented functional and thermal differences.
Technical Context
The SG3524BDW-TR integrates a DC-coupled toggle flip-flop and PWM data latch to eliminate edge oscillations and triggering glitches. Its error amplifier features 60–78 dB open-loop gain and 70–90 dB common-mode rejection over 2.3 V to VREF input range, enabling precise feedback control in isolated flyback and forward converters.
Oscillator timing supports external RT/CT configuration (2 kΩ–150 kΩ / 0.1 nF–0.1 μF), delivering initial frequency accuracy of 40–50 kHz at 25 °C with ±1% voltage and ±2% temperature stability. The current limit amplifier accepts 0–VIN + 2.5 V common-mode input and triggers shutdown at 170–230 mV sense voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Output | 4.90–5.10 V over line, load, and temperature - ensures stable feedback reference for precision regulation |
| Oscillator Frequency Range | 100 Hz to 400 kHz - supports wide-range SMPS designs from low-noise audio supplies to high-efficiency telecom converters |
| Output Transistor Rating | Dual 100 mA sink/source - directly drives gate drivers or small MOSFETs without external buffers |
| Undervoltage Lockout Threshold | 4.2–4.9 V - prevents erratic startup and false triggering during brown-out conditions |
| Operating Ambient Temperature | 0 °C to 70 °C - qualified for commercial-grade industrial power modules and embedded systems |
| Package Thermal Resistance | θJA = 95 °C/W (DW) - defines maximum power dissipation limit under still-air PCB mounting |
| Current Limit Sense Voltage | 170–230 mV - sets accurate overcurrent trip point compatible with standard shunt resistors |
Pinout & Package
SG3524BDW-TR uses a 16-pin Small Outline Wide Body (SOWB) plastic package (DW), measuring 9.78–10.01 mm × 5.79–6.20 mm × 1.25–1.75 mm, with 1.27 mm lead pitch and matte tin RoHS-compliant finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VREF) | Reference Output | 5 V ±1% regulated source for error amp biasing and external circuitry |
| 2 (INV) | Inverting Input | Connects to feedback network; sets output duty cycle via error amplifier comparison |
| 3 (NINV) | Non-Inverting Input | Fixed 2.5 V internal reference for current-sense comparator threshold |
| 4 (COMP) | Error Amplifier Output | Drives PWM comparator; requires external compensation network for loop stability |
| 5 (CT) | Oscillator Timing Capacitor | Connects to CT; sets oscillator frequency with RT on Pin 6 |
| 6 (RT) | Oscillator Timing Resistor | Connects to RT; forms RC network with Pin 5 to define clock period |
| 7 (DIS) | Shutdown Control | Logic-high (>2.0 V) disables outputs; enables pulse-by-pulse current limiting |
| 8 (GND) | Power Ground | Common return for reference, error amp, and oscillator circuits |
| 9 (OUT A) | Output Transistor A Collector | Open-collector NPN output rated 60 V / 100 mA; sinks external load |
| 10 (OUT B) | Output Transistor B Collector | Complementary open-collector NPN output; enables push-pull or dual-phase drive |
| 11 (VCC) | Supply Input | 7–40 V DC input; powers internal circuitry and output transistors |
| 12 (CL) | Current Limit Sense | Inputs sensed voltage across shunt resistor; triggers shutdown when >230 mV |
| 13 (E/A) | Error Amp Output Enable | Internal connection; not externally accessible - ties COMP to PWM comparator |
| 14 (OSC) | Oscillator Output | Provides sawtooth waveform (0.6–3.9 V) for PWM comparator timing |
| 15 (SYNC) | External Sync Input | Accepts TTL/CMOS clock to synchronize multiple SG3524BDW-TR units |
| 16 (VCC) | Supply Input (Redundant) | Second VCC pin for improved supply decoupling and noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| True digital shutdown | Enables sub-microsecond disable response for fault protection and soft-start sequencing |
| Full double-pulse suppression logic | Guarantees alternating output pulses during current-limit mode, preventing transformer saturation |
| Wide current limit common-mode range | Accepts 0 V to VIN + 2.5 V input - supports high-side or low-side shunt placement |
| DC-coupled toggle flip-flop | Eliminates AC coupling capacitors and associated drift, improving transient response fidelity |
| 60 V output collector rating | Supports direct drive of 48 V bus converters and offline flyback topologies without level-shifting |
Applications
| Industrial DC-DC Converter | Isolated Flyback Power Supply |
|---|---|
Use Scenario: Regulated 12 V/5 A output from 24 V industrial rail with tight load regulation and EMI compliance. IC Role / Device Role / Timing Role: Primary-side PWM controller generating complementary gate drive signals synchronized to internal oscillator. Use Value: Dual 100 mA outputs directly interface with Si MOSFET gates; 5 V reference enables accurate secondary-side feedback scaling. |
Use Scenario: 5 V/2 A isolated auxiliary supply in PLC backplane with reinforced creepage and surge immunity. IC Role / Device Role / Timing Role: Regulating pulse width modulator providing fixed-frequency, variable-duty-cycle control of primary switch. Use Value: Undervoltage lockout prevents startup below 4.2 V; current limit sense range accommodates high-side shunt for isolation integrity. |
| Telecom Rectifier Module | Embedded System Point-of-Load Regulator |
Use Scenario: -48 V input telecom rectifier delivering 3.3 V/10 A to base station logic with remote ON/OFF control. IC Role / Device Role / Timing Role: Core PWM generator with external sync capability for parallel module current sharing. Use Value: SYNC pin allows master-slave synchronization across multiple SG3524BDW-TR units, reducing input ripple and EMI peaks. |
Use Scenario: Compact 5 V to 1.2 V/6 A buck converter on FPGA carrier board with thermal derating margin. IC Role / Device Role / Timing Role: Fixed-frequency PWM controller driving external N-channel MOSFETs via gate driver stage. Use Value: 0–70 °C qualification matches board-level thermal profile; DW package enables high-density layout with 95 °C/W θJA. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UC3524N | Same pinout, but reference tolerance ±2% (vs. ±1%), oscillator max 300 kHz (vs. 400 kHz), no SYNC pin | Lacks external synchronization; lower frequency limit restricts high-density designs | Choose UC3524N only if legacy compatibility or cost sensitivity outweighs precision and sync needs |
| TL494CN | Higher reference accuracy (±1% same), but single-ended output (not dual complementary), no current limit sense input | Requires external current sensing and logic inversion for push-pull operation | Select TL494CN when single-output topology suffices and external sensing is acceptable |
Compared with UC3524N and TL494CN, SG3524BDW-TR offers tighter reference accuracy, wider oscillator range, built-in dual complementary outputs, and dedicated current limit input - making it optimal for new designs requiring robust, integrated PWM control in commercial-temperature environments.
Availability
SG3524BDW-TR is available at Aetrix Electronics and suitable for industrial DC-DC converters, isolated flyback power supplies, and telecom rectifier modules requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SG3524BDW-TR 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
Microsemi (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog, mixed-signal, and power management ICs for aerospace, defense, and industrial markets.
The SG3524B family was designed as a military- and commercial-grade regulating PWM controller for switching power supplies, emphasizing precision reference stability, robust fault protection, and flexible oscillator configuration.
FAQ
What is the operating temperature range specified for SG3524BDW-TR?
The SG3524BDW-TR is rated for 0 °C to 70 °C ambient operating temperature, matching the SG3524B variant defined in the Microsemi datasheet Revision 2.0. This commercial-grade specification applies specifically to the DW-package version and is validated per Table 2's recommended operating conditions.
Does SG3524BDW-TR support external clock synchronization?
Yes, SG3524BDW-TR supports external synchronization via Pin 15 (SYNC), which accepts TTL/CMOS-level clock inputs. This feature is explicitly documented in the datasheet block diagram and electrical specifications, enabling precise phase alignment across multiple controllers in parallel power systems.
What is the maximum output current capability of each transistor in SG3524BDW-TR?
Each output transistor in SG3524BDW-TR delivers up to 100 mA continuous sink current, as confirmed in Section 2.1 Features and Table 1 Electrical Characteristics under "Output Section for each Transistor." Peak pulsed current is rated at 200 mA per absolute maximum ratings.
How does the current limit function work in SG3524BDW-TR?
The current limit function in SG3524BDW-TR uses Pin 12 (CL) to monitor voltage across an external shunt resistor. When sensed voltage exceeds 170–230 mV (per Table 1), the internal comparator triggers shutdown, disabling both outputs. This is a dedicated, wide common-mode range input supporting high-side or low-side sensing configurations.
Is SG3524BDW-TR pin-compatible with older SG3524 variants?
SG3524BDW-TR shares identical pinout and electrical behavior with other SG3524B variants in the same DW package, including SG2524BDW. However, it is not pin-compatible with J-, N-, or L-package versions due to differing physical layouts and thermal characteristics - only the DW package matches the SG3524BDW-TR footprint and signal mapping.
SG3524BDW-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Type:
- Transistor Driver
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Flyback
- Number of Outputs:
- 2
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 7V ~ 40V
- Frequency - Switching:
- 50kHz ~ 600kHz
- Duty Cycle (Max):
- 49%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
SG3524BDW-TR FAQ
1.How can I place an order for SG3524BDW-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SG3524BDW-TR 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 SG3524BDW-TR reliable?
The price and inventory of SG3524BDW-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SG3524BDW-TR is usually 5 days.
3.What payment methods are accepted for SG3524BDW-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SG3524BDW-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SG3524BDW-TR?
SG3524BDW-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SG3524BDW-TR 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 SG3524BDW-TR?
For technical support, including SG3524BDW-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SG3524BDW-TR requirements.
6.How does Aetrix verify that SG3524BDW-TR is sourced from the original manufacturer or authorized distributors?
All SG3524BDW-TR 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 SG3524BDW-TR meets industry standards.
7.What is the process for return or replacement of SG3524BDW-TR?
All SG3524BDW-TR units undergo pre-shipment inspection (PSI). If there is an issue with SG3524BDW-TR, 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 SG3524BDW-TR part is unused and in its original packaging.
Return procedure for SG3524BDW-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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