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Texas Instruments UC285TDKTTT-1
- Part No.:
- UC285TDKTTT-1
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
UC285TDKTTT-1.pdf
- Description:
- IC REG LIN 1.5V 5A DDPAK/TO263-5
- Quantity:
- Payment:
- Shipping:
Inventory:100
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Product details
Overview
UC285TDKTTT-1 from Texas Instruments is a 1.5-V fixed-output, 5-A low-dropout linear regulator in TO-263 (TD) package with Kelvin-sense capability, 490-mV maximum dropout at 5-A load, and fast transient response optimized for GTL/BTL bus driving.
For engineers reviewing the UC285TDKTTT-1 datasheet, UC285TDKTTT-1 pinout, UC285TDKTTT-1 application, or UC285TDKTTT-1 equivalent, this page delivers verified specifications, thermal-safe operation up to 100°C, separate VB/VIN bias architecture, reverse current protection, and design guidance for high-speed load transient suppression in precision power rails.
Technical Context
The UC285TDKTTT-1 implements a Darlington output stage powered by dedicated VB supply, enabling 350-mV typical dropout and sub-2-µs transient recovery. Its internal 1.2-V bandgap reference feeds a noninverting power amplifier with Kelvin-sense feedback path routed through the ADJ pin.
It features integrated short-circuit protection (5.1–7.5 A limit), thermal shutdown, and reverse current blocking. PSRR reaches 110 dB at VIN and 67 dB at VB across 100 Hz–1 MHz, supporting clean regulation in noisy switching supply environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.5 V ±15 mV (1.485–1.515 V at 100 mA); enables direct replacement of 1.5-V logic rails without external resistors. |
| Max Load Current | 5 A continuous; supports high-current GTL/BTL termination and FPGA core rails requiring stable high-current sourcing. |
| Dropout Voltage | ≤500 mV at 5-A load (0°C to 100°C); allows operation with minimal headroom from 2.0-V input, reducing power loss and heat generation. |
| Load Regulation | 0.5–4 mV over 10 mA–5 A range; ensures <±0.3% output variation across full load, critical for voltage-sensitive digital interfaces. |
| VIN PSRR | 80–110 dB (100 Hz–1 MHz); suppresses ripple from upstream DC/DC converters, minimizing noise coupling into sensitive loads. |
| VB PSRR | 50–67 dB (100 Hz–1 MHz); isolates bias supply noise from regulation loop, preserving stability under dynamic VB conditions. |
| Short-Circuit Limit | 5.1–7.5 A; provides robust fault containment without latch-up, enabling safe operation in hot-swap or overload scenarios. |
Pinout & Package
UC285TDKTTT-1 uses the 5-pin TO-263 (TD) thermally enhanced surface-mount package (package drawing KTT), with exposed tab electrically connected to GND for optimal thermal dissipation and EMI control.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - ADJ | Feedback reference node | Connected internally to 1.2-V reference; tied to VOUT for fixed 1.5-V operation; enables Kelvin sensing when used with remote load ground connection. |
| 2 - VOUT | Regulated output terminal | Delivers 1.5 V to load; must be routed with low-inductance path; Kelvin sense point referenced via ADJ pin improves load regulation accuracy. |
| 3 - VB | Bias supply input | Powers internal circuitry (reference, error amp, protection logic); requires ≥1.8-V headroom above VOUT; decoupling essential for PSRR performance. |
| 4 - VIN | Power transistor collector supply | Supplies current only to output pass element; dropout (VIN−VOUT) ≤500 mV at 5 A; separate from VB to minimize noise coupling. |
| 5 - GND | Signal and power ground | Reference for ADJ and feedback; tab-connected to PCB ground plane; must be star-pointed near load to maintain Kelvin integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Kelvin-sense feedback | Eliminates trace IR drop impact on regulation accuracy by referencing ADJ to remote load ground-critical for >1-A PCB traces. |
| Separate VB and VIN supplies | Enables independent optimization: low-noise VB for reference/amp stability, and minimal-headroom VIN for efficiency-reducing total system noise floor. |
| Fast transient response | Sub-2-µs recovery from 10 mA–3 A/µs load steps; reduces required output capacitance by >50% vs. standard LDOs in GTL/BTL applications. |
| Reverse current protection | Blocks backflow from VOUT to VIN during shutdown or input brownout-prevents unintended power injection into upstream supplies. |
| Thermal shutdown | Activates at junction temperature >150°C; hysteresis ensures safe restart after cooling-supports reliable operation in enclosed industrial enclosures. |
Applications
| GTL Bus Termination | FPGA Core Power |
|---|---|
|
Use Scenario: Driving 50-Ω GTL signaling lines in high-speed memory controllers with 1.5-V termination voltage. IC Role / Device Role / Timing Role: Precision 1.5-V LDO providing low-noise, fast-transient-suppressing supply for GTL I/O buffers. Use Value: Maintains signal integrity under 3-A/µs edge rates using only 100 µF tantalum + local ceramic, avoiding bulk capacitor oversizing. |
Use Scenario: Supplying 1.5-V core voltage to Xilinx Spartan-3 or Altera Cyclone FPGA banks with dynamic current draw. IC Role / Device Role / Timing Role: High-current LDO delivering stable rail during logic state transitions and configuration bursts. Use Value: 0.5-mV load regulation ensures <±0.03% voltage deviation across 10 mA–5 A, preventing timing violations or configuration errors. |
| Industrial PLC I/O Module | Test Equipment Power Rail |
|
Use Scenario: Powering isolated 1.5-V digital interface ICs in programmable logic controller backplanes operating at 85°C ambient. IC Role / Device Role / Timing Role: Thermally robust LDO with 100°C max TJ rating and reverse current blocking for hot-swap-safe I/O modules. Use Value: 500-mV dropout enables use of 2.0-V intermediate rail, reducing heat generation by 30% vs. 1-V-drop alternatives at 5 A. |
Use Scenario: Generating calibrated 1.5-V reference rail in automated test equipment requiring <100-ppm/h drift and low burst noise. IC Role / Device Role / Timing Role: Low-drift LDO with 1.2-V bandgap reference and 110-dB VIN PSRR for metrology-grade analog subsystems. Use Value: 80–110 dB PSRR suppresses switching noise from SMPS-based main supply, enabling <10-µV RMS output ripple. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout, high-current linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS7A8300RGRT | 2-A rated, 1.5-V fixed, 150-mV typical dropout at 2 A; integrates soft-start and power-good; no Kelvin sense. | Suitable for lower-current, space-constrained designs where fast startup and status signaling are prioritized over 5-A capability. | Select when load current ≤2 A and board area is limited; not suitable for 5-A GTL/BTL or Kelvin-sense requirements. |
| LT3080MPFE#PBF | Adjustable 0–36 V, 1.1-A rated, uses precision current-source reference; no fixed 1.5-V option; requires external resistor set. | Used in lab-grade adjustable supplies and precision analog biasing where programmability and wide VOUT range outweigh current capacity. | Choose for variable-output, ultra-low-noise analog rails; avoid when fixed 1.5-V, 5-A, or Kelvin-sense functionality is mandatory. |
Compared with TPS7A8300RGRT and LT3080MPFE#PBF, UC285TDKTTT-1 uniquely delivers 5-A 1.5-V regulation with Kelvin sensing and 500-mV dropout in TO-263, making it irreplaceable for high-current GTL/BTL and industrial embedded power rails demanding both precision and thermal resilience.
Availability
UC285TDKTTT-1 is available at Aetrix Electronics and suitable for GTL bus termination, FPGA core power, industrial PLC I/O modules, and test equipment power rails requiring stable component supply across extended temperature and high-reliability production cycles.
Supply support for UC285TDKTTT-1 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
Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management ICs for industrial, automotive, and communications markets.
The UC285 series belongs to TI's high-current LDO product line, engineered specifically for fast-transient, low-noise power delivery in GTL, BTL, and high-speed digital interface applications where traditional regulators fail to meet dynamic regulation demands.
FAQ
What is the maximum junction temperature rating for UC285TDKTTT-1?
The UC285TDKTTT-1 has a maximum junction temperature (TJ) rating of 150°C, with guaranteed operation from −40°C to 100°C ambient. Thermal shutdown activates above 150°C to protect the device, and the TO-263 (TD) package's exposed tab enhances heatsinking for sustained 5-A operation in industrial enclosures.
Does UC285TDKTTT-1 require external resistors to set its output voltage?
No, UC285TDKTTT-1 is a fixed 1.5-V output variant and does not require external resistors. The ADJ pin is internally connected to achieve 1.5 V; omitting external components simplifies layout and eliminates resistor tolerance errors-unlike the adjustable UC285TDKTTT-ADJ version which uses R1/R2 to program VOUT.
How does the separate VB pin improve UC285TDKTTT-1 performance?
The separate VB pin powers the internal reference, error amplifier, and protection circuitry independently from VIN, allowing cleaner biasing and higher PSRR (up to 67 dB). This isolation prevents VIN switching noise from modulating the reference, ensuring stable 1.5-V regulation even when VIN is derived from a noisy DC/DC converter.
Can UC285TDKTTT-1 be used with Kelvin sensing in a PCB layout?
Yes, UC285TDKTTT-1 supports Kelvin sensing via the ADJ pin: connect ADJ directly to the load-side ground (not the regulator-side GND) to eliminate trace resistance error. This configuration improves load regulation accuracy to within 0.5 mV over 10 mA–5 A, essential for precision GTL/BTL termination where trace IR drop would otherwise cause voltage droop.
What is the minimum input voltage required for UC285TDKTTT-1 to regulate at 1.5 V?
UC285TDKTTT-1 requires a minimum VIN of 2.0 V to maintain regulation at 1.5 V under full 5-A load, based on its 500-mV maximum dropout specification. At lighter loads, dropout drops below 100 mV, allowing VIN as low as 1.6 V-but for guaranteed 5-A operation across temperature, 2.0 V is the recommended minimum input.
UC285TDKTTT-1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 7.5V
- Voltage - Output (Min/Fixed):
- 1.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 2.2V @ 5A
- Current - Output:
- 5A
- Current - Quiescent (Iq):
- -
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- -
- Protection Features:
- Over Temperature, Reverse Polarity, Short Circuit
- Operating Temperature:
- -40°C ~ 100°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263 (DDPAK-5)
UC285TDKTTT-1 FAQ
1.How can I place an order for UC285TDKTTT-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for UC285TDKTTT-1 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 UC285TDKTTT-1 reliable?
The price and inventory of UC285TDKTTT-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UC285TDKTTT-1 is usually 5 days.
3.What payment methods are accepted for UC285TDKTTT-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UC285TDKTTT-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UC285TDKTTT-1?
UC285TDKTTT-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UC285TDKTTT-1 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 UC285TDKTTT-1?
For technical support, including UC285TDKTTT-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UC285TDKTTT-1 requirements.
6.How does Aetrix verify that UC285TDKTTT-1 is sourced from the original manufacturer or authorized distributors?
All UC285TDKTTT-1 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 UC285TDKTTT-1 meets industry standards.
7.What is the process for return or replacement of UC285TDKTTT-1?
All UC285TDKTTT-1 units undergo pre-shipment inspection (PSI). If there is an issue with UC285TDKTTT-1, 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 UC285TDKTTT-1 part is unused and in its original packaging.
Return procedure for UC285TDKTTT-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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