UC3526DWTRG4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
The UC3526DWTRG4 is a voltage-mode PWM switching controller operating from an 8 V to 35 V input range and targeting multi-topology power supplies including push-pull, half-bridge, and full-bridge converters. Housed in an 18-pin SOIC package, it offers precise duty cycle control and integrated protection features for industrial and telecom power designs.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 18
- Lifecycle
- OBSOLETE
- Datasheet
- UC3526DWTRG4 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- ?°C to 70.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of UC3526DWTRG4?
- Voltage-mode PWM control supporting push-pull, half-bridge, and full-bridge topologies
- 8 V to 35 V input voltage range with 15 V nominal operating point
- Integrated soft-start, overcurrent, and shutdown protection functions
- 18-pin SOIC package enabling compact industrial power supply layout
- Programmable oscillator frequency for flexible switching frequency selection
- RoHS-compliant Pb-free construction (JESD-609 code e4)
What is UC3526DWTRG4 used for?
The UC3526DWTRG4 is used in industrial SMPS designs, telecom DC-DC converters, and off-line power supplies where voltage-mode PWM control with multi-topology flexibility is required. Its 8 V to 35 V input range suits intermediate bus converters operating from 12 V or 24 V rails in factory automation and networking equipment. It also finds use in UPS systems and motor drive auxiliary power stages where reliable duty cycle control and protection features are critical.
What are the specifications of UC3526DWTRG4?
| Pbfree Code | Yes |
| YTEOL | 0 |
| Analog IC - Other Type | SWITCHING CONTROLLER |
| Control Mode | VOLTAGE-MODE |
| Control Technique | PULSE WIDTH MODULATION |
| Input Voltage-Max | 35V |
| Input Voltage-Min | 8V |
| Input Voltage-Nom | 15V |
| JESD-30 Code | R-PDSO-G18 |
| JESD-609 Code | e4 |
| Number of Functions | 1 |
| Output Current-Max | 0.2A |
| Output Voltage-Nom | 5V |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP18,.4 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Surface Mount | YES |
| Switcher Configuration | PUSH-PULL |
| Switching Frequency-Max | 400kHz |
| Technology | CMOS |
| Temperature Grade | COMMERCIAL |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 2 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
Where can I find the UC3526DWTRG4 datasheet?
UC3526DWTRG4 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for UC3526DWTRG4?
Compatible alternatives and drop-in replacements for UC3526DWTRG4:
Switching Controller, Voltage-mode, 0.2A, 400kHz Switching Freq-Max, CMOS, PDSO18
Switching Controller, Voltage-mode, 0.2A, 400kHz Switching Freq-Max, CMOS, PDSO18
Switching Controller, Voltage-mode, 0.2A, 400kHz Switching Freq-Max, CMOS, PDSO18
Frequently Asked Questions
Which converter topologies can UC3526DWTRG4 control, and how does it support push-pull versus bridge designs?
The UC3526DWTRG4 supports multiple topologies including push-pull, half-bridge, and full-bridge converters by providing two complementary PWM outputs with programmable dead time. In push-pull designs the outputs alternate at half the switching frequency, while bridge topologies use the dual outputs to drive high- and low-side switches. This flexibility from a single 18-pin SOIC controller reduces design iteration compared to topology-specific ICs.
How should the oscillator be programmed on UC3526DWTRG4 to set the switching frequency for a 100 kHz SMPS?
The UC3526DWTRG4 oscillator frequency is set by an external resistor and capacitor connected to the RT and CT pins. For a 100 kHz switching frequency, the external RC network is calculated from the datasheet timing equation, typically using a 10 kΩ to 100 kΩ resistor and a 1 nF to 10 nF capacitor depending on the desired frequency. The input voltage range of 8 V to 35 V does not affect the oscillator timing directly.
What input voltage margin does UC3526DWTRG4 provide for a 24 V bus in an industrial SMPS?
The UC3526DWTRG4 operates up to a maximum input of 35 V, providing 11 V of margin above a nominal 24 V bus. This headroom accommodates load dump transients and input voltage sags typical in industrial environments. The 8 V minimum ensures reliable under-voltage lockout protection, stopping PWM outputs before the controller operates in an undefined state during power-up or brown-out conditions.
Does the UC3526DWTRG4 include soft-start to limit inrush current during power supply startup?
Yes. The UC3526DWTRG4 includes a soft-start function controlled by an external capacitor that ramps the duty cycle gradually from 0% to the steady-state value during startup, limiting inrush current through the transformer and output rectifiers. A 100 nF soft-start capacitor typically yields a startup ramp of approximately 1 ms to 10 ms depending on the internal charge current, reducing stress on output capacitors and rectifiers.
Is UC3526DWTRG4 a drop-in replacement for UC2526 in legacy industrial power supply boards?
The UC3526DWTRG4 is the commercial-temperature version sharing the same 18-pin SOIC pinout as the UC2526 industrial-temperature variant, making it functionally compatible in most cases. Key differences are the temperature rating: UC3526 covers 0°C to 70°C while UC2526 covers -40°C to +85°C. Designers upgrading from the UC2526 to the G4 tape-and-reel variant should verify that the 0°C to 70°C range satisfies the application environment before substituting.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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