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Texas Instruments UC3907DWTRG4
- Part No.:
- UC3907DWTRG4
- Manufacturer:
- Texas Instruments
- Category:
- Power Management - Specialized
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
UC3907DWTRG4.pdf
- Description:
- IC LOAD SHARE CTRLR 16-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,237
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Product details
Overview
UC3907DWTRG4 from Texas Instruments is a load-share controller IC designed for parallel power module systems, providing precise current sharing across multiple DC-DC modules with ±2.5% matching accuracy, 2.0 V ±1.25% internal reference, and 4.5 V to 35 V supply operation - used in redundant telecom and industrial power supplies.
For engineers reviewing the UC3907DWTRG4 datasheet, UC3907DWTRG4 pinout, UC3907DWTRG4 application, or UC3907DWTRG4 equivalent, key selection considerations include its differential current-sense amplifier gain (20 V/V), optocoupler drive capability (up to 20 mA), master-status indication, and SOIC-16 package compatibility with isolated feedback loops.
Technical Context
The UC3907DWTRG4 implements a transconductance-based adjust amplifier that compares local module current against a shared bus voltage to dynamically trim the reference voltage by up to ±100 mV (±5% range), enabling active current balancing. Its fully differential voltage sensing input (±1.25% trimmed) and high-impedance (–) SENSE pin support remote ground sensing independent of power return path drops.
It integrates a dedicated current-sense amplifier (20× gain, 0–500 mV shunt range), buffer amplifier for low-impedance current-share bus driving, and drive amplifier optimized for optocoupler interfacing with fixed 2.5× gain and 4–35 V output swing - all operating over 0°C to 70°C ambient temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 4.5 V to 35 V - supports direct connection to unregulated DC bus or auxiliary rail without external regulation. |
| Reference Voltage Accuracy | 2.0 V ±1.25% at 25°C - enables stable voltage-loop setpoint with minimal external trimming. |
| Current Sharing Accuracy | ±2.5% between paralleled modules - achieved via master-slave arbitration on shared bus with 50 mV offset compensation. |
| Opto Drive Output Current | Up to 20 mA - directly interfaces standard phototransistor optocouplers without external driver stages. |
| Operating Temperature | 0°C to 70°C - specified for commercial-grade power system applications including telecom rectifiers. |
| Current Sense Gain | 20 V/V - allows flexible shunt resistor selection (e.g., 25 mΩ for 500 mV full-scale at 20 A). |
| Status Output Type | Open-collector master indicator - sinks up to 20 mA to signal master module status for system-level monitoring. |
Pinout & Package
UC3907DWTRG4 is housed in a 16-pin SOIC (DW) package with 1.27 mm pitch, RoHS-compliant NiPdAu lead finish, and moisture sensitivity level (MSL) 2 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| C/S OUT (Pin 1) | Current Share Bus Driver Output | Sources current onto shared bus; only master unit drives low-impedance signal while others present 10 kΩ load. |
| C/S (+) (Pin 2) | Current Sense Positive Input | Differential input for shunt resistor high-side sensing; common-mode range extends to VCC – 2 V. |
| C/S (–) (Pin 3) | Current Sense Negative Input | Differential input referenced to (–) SENSE; rejects noise and line impedance variations. |
| (–) SENSE (Pin 4) | Remote Ground Reference | High-impedance node defining true system ground; all voltages referenced here bypass return-path IR drops. |
| POWER RETURN (Pin 5) | Power Stage Return Path | Connects to most negative point of power stage; voltage drop between this and (–) SENSE sets current sense baseline. |
| ARTIFICIAL GND (Pin 6) | Internal Bias Reference | Fixed 250 mV above (–) SENSE; provides headroom for ground amplifier and bias circuits. |
| VREF (Pin 7) | 2.0 V Bandgap Reference Output | Stable 2.0 V ±1.25% source for error amplifier; trimmed closed-loop at (+) SENSE pin (Pin 11). |
| ISET (Pin 8) | Optocoupler Current-Setting Node | Sinks current through external RSET to Artificial GND; sets opto drive current (e.g., 500 Ω → ~5 mA). |
| STATUS INDICATE (Pin 16) | Master Status Flag | Open-collector output pulled low only when device operates as master; compatible with 3.3 V/5 V logic monitoring. |
Key Features
| Feature | Design Value |
|---|---|
| Fully differential high-Z voltage sensing | Enables accurate remote sensing at (+) SENSE/(–) SENSE pins without loading the feedback divider network. |
| Accurate current amplifier with 20× gain | Supports 50–500 mV shunt voltage range, reducing power loss and thermal drift impact in high-current designs. |
| Optocoupler driving capability | Integrated drive amplifier delivers 4–35 V swing and up to 20 mA, eliminating need for discrete transistor buffers. |
| 1.25% trimmed internal reference | Reduces system-level calibration effort and improves long-term output voltage stability across temperature. |
| Master status indication | Open-collector STATUS INDICATE pin simplifies system-level fault detection and redundancy management. |
Applications
| Telecom Rectifier Systems | Industrial Redundant PSUs |
|---|---|
|
Use Scenario: Parallel operation of multiple 48 V DC-DC modules in central office power shelves requiring N+1 redundancy. IC Role / Device Role / Timing Role: Load-share controller coordinating current distribution among modules via current-share bus; no timing function involved. Use Value: Maintains ≤±2.5% current imbalance under dynamic load steps and thermal gradients, preventing single-module overload. |
Use Scenario: Modular 24 V power system for PLC backplanes where hot-swap capability and graceful degradation are required. IC Role / Device Role / Timing Role: Master-slave current balancer ensuring proportional load sharing across independently regulated modules. Use Value: Enables seamless addition/removal of modules without interrupting output; eliminates need for manual current trim pots. |
| Server Power Supply Units | Medical Grade AC-DC Front Ends |
|
Use Scenario: High-density 12 V VRM arrays in data center servers using multiple interleaved buck converters. IC Role / Device Role / Timing Role: Analog current-sharing supervisor interfacing with each converter's feedback loop via optocouplers. Use Value: Achieves tight current match (<±3%) across thermally mismatched modules, improving thermal derating margin. |
Use Scenario: Dual-redundant 5 V/3.3 V medical power supplies requiring compliance with IEC 60601-1 creepage and isolation. IC Role / Device Role / Timing Role: Isolated feedback controller using optocoupler-coupled COMP and ADJ signals to maintain safety barriers. Use Value: Supports reinforced isolation while delivering precise current balance without compromising patient safety requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar load-share controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UC2907DWTR | Wider temperature range (–40°C to +85°C); identical pinout and functional architecture. | Preferred for extended-temperature industrial or automotive auxiliary power systems. | Select UC2907DWTR when operating beyond 70°C ambient or requiring broader qualification coverage. |
| LTC4370IMS#PBF | Wide-input rail (2.5 V to 36 V), integrated MOSFET drivers, and automatic master election; different topology (no opto drive). | Used in low-voltage battery-powered systems and hot-swap controllers where discrete FETs replace linear/switching regulators. | Choose LTC4370 for modern designs needing digital-configurable current share and lower quiescent current (60 µA vs. 10 mA). |
Compared with UC3907DWTRG4, UC2907DWTR offers extended temperature operation but same analog control architecture, while LTC4370IMS#PBF replaces optocoupler-based isolation with integrated MOSFET control and digital arbitration - making it suitable for newer, lower-power, or digitally managed systems.
Availability
UC3907DWTRG4 is available at Aetrix Electronics and suitable for telecom rectifier systems, industrial redundant PSUs, and server power supply units requiring stable component supply and long-lifecycle support.
Supply support for UC3907DWTRG4 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 since 1930.
The UCx907 family was developed specifically for analog current-sharing control in parallel-connected DC-DC power modules, targeting high-reliability telecom and industrial power systems where precision, noise immunity, and isolation robustness are critical.
FAQ
What is the primary function of the UC3907DWTRG4 in a power system?
The UC3907DWTRG4 serves as an analog load-share controller that ensures proportional current distribution among multiple paralleled DC-DC power modules. It achieves this by comparing each module's output current to a shared bus voltage and adjusting individual reference voltages to maintain ≤±2.5% current imbalance. The UC3907DWTRG4 does not regulate voltage directly but interfaces with each module's existing feedback loop - typically via optocoupler or direct connection - to enforce balanced loading without digital communication.
Does the UC3907DWTRG4 support isolated feedback architectures?
Yes, the UC3907DWTRG4 explicitly supports isolated feedback through its integrated drive amplifier (Pins 8, 9, 12), which delivers up to 20 mA into optocoupler LEDs with 4–35 V output swing. This allows direct interface with industry-standard phototransistor optocouplers (e.g., PC817, TLP521) without external driver circuitry. The UC3907DWTRG4's COMP and ADJ OUT signals are designed to drive isolated paths, preserving safety barriers while maintaining precise analog current sharing across modules.
What is the role of the (–) SENSE and ARTIFICIAL GND pins on the UC3907DWTRG4?
The (–) SENSE pin (Pin 4) is a high-impedance reference node defining true system ground, allowing remote sensing that excludes voltage drops in the power return path. The ARTIFICIAL GND pin (Pin 6) is a low-impedance output fixed at 250 mV above (–) SENSE, providing bias headroom for internal amplifiers and enabling stable operation of the ground amplifier. In the UC3907DWTRG4, these two pins work together to decouple control-loop references from power-stage return noise - a key requirement for accurate current sensing and voltage regulation in high-current applications.
Can the UC3907DWTRG4 operate with a 3.3 V supply?
No, the UC3907DWTRG4 requires a minimum supply voltage of 4.5 V per its absolute maximum ratings and electrical characteristics tables. Operation below 4.5 V will trigger under-voltage lockout (UVLO), disabling internal bias currents and halting functionality. The UVLO startup threshold is specified at 3.7 V to 4.4 V with 200 mV hysteresis, meaning the UC3907DWTRG4 remains inactive until VIN exceeds ~4.6 V. For 3.3 V systems, alternative solutions such as level-shifting supplies or different load-share ICs (e.g., LTC4370) must be considered.
How does the UC3907DWTRG4 identify the master module in a parallel configuration?
The UC3907DWTRG4 identifies the master module using its internal adjust amplifier's output state: the unit with the highest output current drives the current-share bus low via C/S OUT (Pin 1), causing all other modules' adjust amplifiers to increase their reference voltage. The STATUS INDICATE pin (Pin 16) is an open-collector output tied to this condition - it pulls low only when the UC3907DWTRG4 operates as master. This signal can interface directly with microcontrollers or LED indicators for system-level monitoring without additional logic.
UC3907DWTRG4 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
- Applications:
- Load Share Controller
- Current - Supply:
- 6mA
- Voltage - Supply:
- 4.5V ~ 36V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
UC3907DWTRG4 FAQ
1.How can I place an order for UC3907DWTRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for UC3907DWTRG4 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 UC3907DWTRG4 reliable?
The price and inventory of UC3907DWTRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UC3907DWTRG4 is usually 5 days.
3.What payment methods are accepted for UC3907DWTRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UC3907DWTRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UC3907DWTRG4?
UC3907DWTRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UC3907DWTRG4 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 UC3907DWTRG4?
For technical support, including UC3907DWTRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UC3907DWTRG4 requirements.
6.How does Aetrix verify that UC3907DWTRG4 is sourced from the original manufacturer or authorized distributors?
All UC3907DWTRG4 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 UC3907DWTRG4 meets industry standards.
7.What is the process for return or replacement of UC3907DWTRG4?
All UC3907DWTRG4 units undergo pre-shipment inspection (PSI). If there is an issue with UC3907DWTRG4, 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 UC3907DWTRG4 part is unused and in its original packaging.
Return procedure for UC3907DWTRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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