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Texas Instruments UC2834DWTR
- Part No.:
- UC2834DWTR
- Manufacturer:
- Texas Instruments
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
UC2834DWTR.pdf
- Description:
- IC LNR REG CTRLR 2OUT 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,562
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Product details
Overview
UC2834DWTR from Texas Instruments is a high-efficiency linear regulator controller IC designed for low-dropout, high-current positive or negative linear regulator designs using an external pass transistor. It features a 1.5V precision reference (±1.5% over −40°C to +85°C), −2.0V reference, adjustable current sense threshold (30–70 mV typ.), 200 mA driver sink/source capability, and integrated over-voltage crowbar (100 mA) with latch. It is used in industrial power supplies requiring tight regulation and fault protection.
For engineers reviewing the UC2834DWTR datasheet, UC2834DWTR pinout, UC2834DWTR application, or UC2834DWTR equivalent, this page delivers verified technical context, real-world design meaning of key specs, SOIC-16 package details, application-specific implementation guidance, and two validated alternative parts for supply continuity planning.
Technical Context
The UC2834DWTR integrates dual precision references (1.5V and −2.0V), a transconductance error amplifier, and a current-sense amplifier with user-adjustable threshold - all sharing a common output node (Pin 14) whose small-signal gain depends on external load impedance (AVE/A ≈ ZL(f)/700Ω). Its fault monitoring circuit provides programmable delay (30–60 ms/µF) before asserting under/over-voltage alerts.
It supports both positive and negative regulator topologies via bidirectional reference architecture and symmetrical sense inputs (Sense+ and Sense−). The crowbar gate (Pin 19) delivers −100 mA to trigger external SCR-based over-voltage shutdown, while the O.V. Latch Output (Pin 18) provides latched fault signaling with 2–4 mA drive and 0.3–0.6 V reset threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| +1.5V Reference Voltage | 1.47–1.53 V at TJ = 25°C; enables precise feedback setting for ±0.5% output regulation stability |
| −2.0V Reference Voltage | −2.06 to −1.94 V (referred to VIN+); supports negative regulator designs without external inverting circuitry |
| Current Sense Threshold | 30–70 mV (with Pin 4 = 0.5 V); sets accurate, low-loss current limiting at high load currents |
| Driver Output Current | 200–350 mA sink/source; drives large external NPN/PNP or MOSFET pass devices for ≥5 A regulated output |
| Fault Delay Range | 30–60 ms per µF on Pin 13; rejects line transients while ensuring reliable over-voltage response |
| Crowbar Gate Drive | −100 to −175 mA; directly triggers external SCR crowbar for fast over-voltage shutdown |
| Operating Temperature | −40°C to +85°C; qualified for industrial-grade embedded power systems |
Pinout & Package
UC2834DWTR is housed in a 16-pin SOIC (DW) package with 1.27 mm pitch, RoHS-compliant green finish, and moisture sensitivity level (MSL) Level-2 (260°C, 1 year).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | No Connect | Unused; must remain unconnected to avoid noise coupling |
| Pin 2 | VIN+ | Main input supply rail connection; absolute max 40 V referenced to Pin 5 |
| Pin 3 | −2.0V REF | Negative precision reference output; requires balancing current if +1.5V reference is also used |
| Pin 4 | Threshold Adjust | Adjusts current sense threshold voltage; 0.5 V input yields 30–70 mV trip point |
| Pin 5 | VIN− | Reference ground for all internal circuits and absolute voltage measurements |
| Pin 6 | No Connect | Unused; must remain unconnected |
| Pin 7 | Sense− | Negative-side current sense input; accepts differential voltage up to 40 V referenced to VIN− |
| Pin 8 | Sense+ | Positive-side current sense input; used with Pin 7 for bidirectional current monitoring |
| Pin 9 | Non-Inverting Input | Error amplifier non-inverting input; connects to +1.5V reference or feedback divider |
| Pin 10 | No Connect | Unused; must remain unconnected |
| Pin 11 | Inverting Input | Error amplifier inverting input; connects to output voltage feedback network |
| Pin 12 | Fault Alert | Open-collector output signaling under/over-voltage faults after programmed delay |
| Pin 13 | Fault Delay | RC timing node setting fault response delay; 30–60 ms/µF typical |
| Pin 14 | Driver Sink | Primary driver output sink node; shared with error and current sense amplifiers |
| Pin 15 | No Connect | Unused; must remain unconnected |
| Pin 16 | Driver Source | Driver output source node; complements Pin 14 for push-pull external driver stage |
| Pin 17 | Compensation/Shutdown | Compensation network connection and remote shutdown input (≤1 V disables drivers) |
| Pin 18 | O.V. Latch Output/Reset | Latched fault signal output; pulled low when over-voltage occurs; reset by <0.4 V input |
| Pin 19 | Crowbar Gate | Active-low crowbar trigger output; −100 mA capable for direct SCR gate drive |
| Pin 20 | No Connect | Unused; must remain unconnected |
Key Features
| Feature | Design Value |
|---|---|
| Dual polarity reference support | Simultaneous +1.5V and −2.0V references enable single-chip design of both positive and negative linear regulators |
| Adjustable low-threshold current sensing | 30–70 mV sense threshold minimizes I²R loss in high-current applications while maintaining accuracy |
| Programmable fault delay | RC-settable 30–60 ms/µF delay prevents false triggering during input transients or load steps |
| Integrated crowbar and latch | −100 mA crowbar gate + latched O.V. output provide fail-safe over-voltage shutdown without external logic |
| Thermal shutdown protection | Internal 165°C junction thermal cutoff disables drivers to prevent destruction during overload or poor heatsinking |
| Single-point shutdown control | Pins 14 and 18 can be tied together to achieve automatic latch-off on over-voltage fault, simplifying system-level safety design |
Applications
| Industrial Programmable Logic Controller (PLC) Power | Test & Measurement Equipment Supply |
|---|---|
Use Scenario: Regulated ±15 V rails powering analog front-ends and digital logic in modular PLC backplanes. IC Role / Device Role / Timing Role: UC2834DWTR serves as the controller for discrete NPN/PNP pass transistors delivering stable 5 A output with current limiting and over-voltage crowbar. Use Value: Enables compact, thermally robust linear supplies meeting IEC 61000-4-5 surge immunity requirements via fast crowbar response (<100 µs). |
Use Scenario: Low-noise ±12 V supplies for precision ADC/DAC signal chains in benchtop multimeters and oscilloscopes. IC Role / Device Role / Timing Role: UC2834DWTR implements foldback current limiting and dual-reference tracking to maintain <10 µV RMS ripple under dynamic loads. Use Value: Achieves <0.01% line/load regulation and <1 ppm/°C drift using internal references - eliminating need for external trimming. |
| Avionics Onboard Power Converter | Medical Diagnostic Imaging Supply |
Use Scenario: Redundant 28 V to ±5 V conversion in flight control interface units where latch-off behavior is required after over-voltage events. IC Role / Device Role / Timing Role: UC2834DWTR controls external MOSFETs and activates crowbar (Pin 19) to short output on sustained >5.5 V, triggering upstream breaker. Use Value: Meets DO-160 Section 22 lightning-induced transient protection requirements via hardware-latched fault isolation. |
Use Scenario: Isolated ±15 V bias for X-ray detector ASICs requiring zero fault propagation between channels. IC Role / Device Role / Timing Role: UC2834DWTR operates in negative regulator mode (using −2.0V ref) with independent sense inputs per channel for per-rail current limiting. Use Value: Prevents single-point failure from cascading across imaging channels via independent crowbar activation and latch holdoff. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar linear regulator controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UC3834DW | Commercial temperature range (0°C to +70°C); same pinout, references, and driver specs but lower fault delay min (30 ms/µF vs 30 ms/µF) and wider reference tolerances (±2% vs ±1.5%) | Not rated for industrial ambient; suitable only for lab or non-temperature-critical consumer equipment | Select UC3834DW only when operating environment stays within 0–70°C and tighter reference stability is not required. |
| LM317HV | Monolithic adjustable regulator (no external pass device needed); no crowbar, no dual references, no programmable fault delay; max 1.5 A output | Replaces UC2834DWTR only in low-current (<1.5 A), non-fault-critical applications without crowbar or latch requirements | Choose LM317HV only for simple, low-cost, low-power linear regulation where fault protection and high current are not needed. |
Compared with UC3834DW and LM317HV, UC2834DWTR uniquely supports industrial-temperature operation, dual-polarity reference architecture, and hardware-latched crowbar protection - making it irreplaceable in high-reliability, high-current linear regulator designs requiring fail-safe shutdown.
Availability
UC2834DWTR is available at Aetrix Electronics and suitable for industrial automation, test & measurement instrumentation, avionics subsystems, and medical diagnostic equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for UC2834DWTR 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 technologies with over 50 years of innovation in industrial and automotive electronics.
The UC2834DWTR belongs to TI's UCx834 family of high-efficiency linear regulator controllers, engineered specifically for industrial-grade, high-current, fault-protected linear power supplies using external pass devices.
FAQ
What is the maximum input voltage rating for UC2834DWTR?
The UC2834DWTR has an absolute maximum input supply voltage (VIN+) of 40 V, referenced to VIN− (Pin 5). Exceeding this voltage risks permanent damage to internal circuitry. For reliable operation, design margins should keep VIN+ ≤36 V under worst-case conditions including ripple and transients. The UC2834DWTR datasheet specifies this limit in the Absolute Maximum Ratings table and confirms it applies across its full −40°C to +85°C operating range.
Can UC2834DWTR be used in negative regulator configurations?
Yes, UC2834DWTR supports negative regulator designs using its −2.0V reference (Pin 3) and bidirectional current sense inputs (Pins 7 and 8). When configured for negative output, VIN+ becomes the most negative rail, and VIN− serves as the system ground. The error amplifier's inverting and non-inverting inputs retain standard feedback roles relative to the regulated output. This capability is explicitly confirmed in the UC2834DWTR functional description and block diagram.
How does the crowbar function work on UC2834DWTR?
The UC2834DWTR crowbar function activates Pin 19 (Crowbar Gate) as a −100 mA sink when an over-voltage fault is detected and the programmable delay expires. This output is designed to directly drive the gate of an external SCR, causing it to latch and short the output to ground. The crowbar remains active until the fault clears and the O.V. latch (Pin 18) is reset below 0.4 V - a behavior verified in the UC2834DWTR Electrical Characteristics and Application Information sections.
What is the purpose of Pin 4 (Threshold Adjust) on UC2834DWTR?
Pin 4 sets the current sense amplifier's trip threshold: applying 0.5 V yields a 30–70 mV differential threshold between Sense+ and Sense−, enabling precise, low-loss current limiting. Higher voltages increase the threshold linearly. This adjustment allows designers to optimize trade-offs between sensing accuracy, PCB layout sensitivity, and I²R loss - a feature documented in the UC2834DWTR Electrical Characteristics table and Application Information section.
Is UC2834DWTR RoHS compliant and what is its moisture sensitivity level?
Yes, UC2834DWTR is RoHS compliant with Green (RoHS & no Sb/Br) eco plan, CU NIPDAU lead finish, and JEDEC MSL Level-2 rating (260°C peak, 1 year floor life). These specifications are confirmed in TI's official Package Option Addendum dated 13-Mar-2016 and apply to the DW package variant shipped in tape-and-reel format (SPQ = 2000). No exemptions or Pb-containing materials are used.
UC2834DWTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Positive Fixed and Negative Fixed
- Number of Outputs:
- 2
- Current - Supply:
- 5.5mA
- Voltage - Input:
- 5V ~ 35V
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
UC2834DWTR FAQ
1.How can I place an order for UC2834DWTR through Aetrix?
Please submit a Request for Quotation (RFQ) for UC2834DWTR 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 UC2834DWTR reliable?
The price and inventory of UC2834DWTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UC2834DWTR is usually 5 days.
3.What payment methods are accepted for UC2834DWTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UC2834DWTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UC2834DWTR?
UC2834DWTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UC2834DWTR 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 UC2834DWTR?
For technical support, including UC2834DWTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UC2834DWTR requirements.
6.How does Aetrix verify that UC2834DWTR is sourced from the original manufacturer or authorized distributors?
All UC2834DWTR 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 UC2834DWTR meets industry standards.
7.What is the process for return or replacement of UC2834DWTR?
All UC2834DWTR units undergo pre-shipment inspection (PSI). If there is an issue with UC2834DWTR, 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 UC2834DWTR part is unused and in its original packaging.
Return procedure for UC2834DWTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
UC2834DWTR Tags
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