UCC3809PTR-1 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
UCC3809PTR-1 is a current-mode PWM switching controller by Texas Instruments designed for offline and DC-DC power supplies. Key specs: 10 V to 19 V input range, programmable oscillator up to 1 MHz, and low 1 mA startup current. Available from stock worldwide with fast shipping.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- UCC3809PTR-1 Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $1.2400(MOQ 155)
- Temp Range
- ?°C to 70.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Current-mode control with slope compensation simplifies loop compensation and improves line transient response in PWM converters
- Programmable oscillator frequency up to 1 MHz enables miniaturized magnetics and compact switching power supply designs
- Low 1 mA startup current reduces power dissipation in the bias supply and supports efficient light-load operation
Applications
UCC3809PTR-1 is designed for isolated and non-isolated DC-DC converters, flyback supplies, and forward converters operating from 10 V to 19 V input rails. Its current-mode architecture with integrated gate driver simplifies the design of telecom, industrial, and computing power supplies requiring tight voltage regulation under variable loads. The 8-pin SOIC package and integrated soft-start reduce external component count in compact power module designs.
Specifications
| Pbfree Code | Yes |
| YTEOL | 15 |
| Analog IC - Other Type | SWITCHING CONTROLLER |
| Control Mode | CURRENT-MODE |
| Control Technique | PULSE WIDTH MODULATION |
| Input Voltage-Max | 19V |
| Input Voltage-Min | 10V |
| Input Voltage-Nom | 12V |
| JESD-30 Code | S-PDSO-G8 |
| JESD-609 Code | e4 |
| Number of Functions | 1 |
| Output Current-Max | 0.8A |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | TSSOP8,.19 |
| Package Shape | SQUARE |
| Package Style | SMALL OUTLINE, THIN PROFILE, SHRINK PITCH |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Supply Current-Max (Isup) | 25mA |
| Supply Voltage-Max (Vsup) | 19V |
| Supply Voltage-Min (Vsup) | 10V |
| Supply Voltage-Nom (Vsup) | 12V |
| Surface Mount | YES |
| Switcher Configuration | BUCK-BOOST |
| Switching Frequency-Max | 1000kHz |
| Technology | BCDMOS |
| Temperature Grade | COMMERCIAL |
| Terminal Finish | Nickel/Palladium/Gold/Silver (Ni/Pd/Au/Ag) |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.65mm |
| 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 | 8542.39.00.90 |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What oscillator frequency range does UCC3809PTR-1 support, and how does it influence transformer size?
The UCC3809PTR-1 supports a programmable switching frequency from below 100 kHz up to 1 MHz, set by an external RC network on the RT/CT pins. Running at 500 kHz to 1 MHz allows the power transformer core volume to be reduced by a factor of 5 to 10 compared to a 50 kHz design, directly cutting cost and PCB area in isolated flyback converters. Higher frequency operation requires faster rectifier diodes and careful layout to manage switching losses.
How does current-mode control in UCC3809PTR-1 improve protection against output short circuits?
In current-mode control, the UCC3809PTR-1 terminates each switching cycle immediately when the sensed primary current exceeds the error-amplifier set threshold, providing inherent cycle-by-cycle peak current limiting. During an output short, this limits maximum inductor current to a safe peak every switching period, preventing transformer saturation and protecting the power switch from overcurrent damage without requiring a separate overcurrent comparator. The typical current limit threshold is set by a resistor divider on the CS pin.
What input voltage range does UCC3809PTR-1 accept, and which supply topologies benefit most?
UCC3809PTR-1 operates from a 10 V to 19 V VCC supply, making it ideal for use with an auxiliary winding on the power transformer or a regulated 12 V bias supply common in telecom and server power architectures. The 10 V under-voltage lockout threshold ensures the controller only enables switching once the gate-drive supply is adequate, preventing incomplete switch turn-on and shoot-through conditions at startup.
How does UCC3809PTR-1 compare to UCC3809PTR-2 for selecting the right variant?
The UCC3809PTR-1 and UCC3809PTR-2 differ in their internal leading-edge blanking and soft-start timing. The -1 variant provides a shorter leading-edge blanking of approximately 100 ns, which suits higher-frequency designs above 200 kHz where the current sense signal settles quickly. Both share the same 8-pin SOIC package, 10 V to 19 V operating range, and 1 MHz maximum frequency, so the choice depends on the specific switching frequency and noise immunity requirements of the converter.
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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.
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 155+ | $1.9400 | $300.70 |
| 500+ | $1.4000 | $700.00 |
| 1000+ | $1.3200 | $1320.00 |
| 10000+ | $1.2400 | $12400.00 |
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