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Texas Instruments UC3907DWTR
- Part No.:
- UC3907DWTR
- Manufacturer:
- Texas Instruments
- Category:
- Power Management - Specialized
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
UC3907DWTR.pdf
- Description:
- IC LOAD SHARE CONTROLLER 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,956
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Product details
Overview
UC3907DWTR from Texas Instruments is a load share controller IC designed for parallel operation of multiple DC-DC power modules. It enables precise current sharing (±2.5% matching) via differential current sensing, a 2.0 V ±1.25% trimmed reference, and optocoupler-compatible drive output. It operates from 4.5 V to 35 V and resides on the output side of each module to implement voltage feedback control in isolated or non-isolated topologies.
For engineers reviewing the UC3907DWTR datasheet, UC3907DWTR pinout, UC3907DWTR application, or UC3907DWTR equivalent, key selection considerations include its master-status indication, current-share bus architecture, fixed 20× current-sense gain, ±1.25% reference accuracy, and SOIC-16 package compatibility with industrial temperature range (0°C to 70°C).
Technical Context
The UC3907DWTR implements a transconductance-based adjust amplifier that compares local current-sense voltage against a shared bus signal to dynamically trim the internal 2.0 V reference by up to ±100 mV (±5%). Its fully differential, high-impedance voltage sensing (pins 11–12) interfaces with external compensation networks to close the output-voltage regulation loop.
Current sharing is enforced through a unidirectional buffer amplifier (pin 15) driving the low-impedance current-share bus; only the highest-current module acts as master, pulling the bus low while others source negligible current. The status-indicate pin (16) provides open-collector master identification, and the opto-drive output (pin 8) delivers 0–20 mA into 4–35 V bias rails.
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 supply without external regulators |
| Reference Voltage Accuracy | 2.0 V ±1.25% - enables stable voltage feedback setpoint with minimal external trimming |
| Current Sense Gain | 20 V/V - allows 50–500 mV shunt drop selection for precise current monitoring across wide load ranges |
| Current Sharing Accuracy | ±2.5% - ensures balanced load distribution among paralleled power modules under steady-state conditions |
| Opto Drive Output | 0–20 mA sink capability - directly interfaces with standard optocouplers for isolated feedback in off-line supplies |
| Operating Temperature | 0°C to 70°C - qualified for commercial/industrial embedded power systems requiring reliable thermal margin |
| Status Indicate Sink | 20 mA max - drives LED or logic-level input to flag master module status without external buffering |
Pinout & Package
UC3907DWTR 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). The package supports surface-mount assembly and fits standard 16-pin SOIC footprints.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| C/S OUT (Pin 1) | Current Share Bus Output | Unidirectional buffer output sourcing current onto shared bus; only active when module is not master |
| C/S (+) (Pin 2) | Current Sense Positive Input | Differential input for shunt voltage measurement; common-mode range extends to VCC – 2 V |
| C/S (–) (Pin 3) | Current Sense Negative Input | Complementary differential input referenced to (–) SENSE; enables remote sensing across noisy return paths |
| (–) SENSE (Pin 4) | Remote Ground Reference | High-impedance point defining true system ground; all voltages referenced here eliminate return-path IR drop errors |
| POWER RETURN (Pin 5) | Power Ground Return | Lowest system potential node; connects near power source to isolate sense shunt from return-line voltage drops |
| ARTIFICIAL GND (Pin 6) | Internal Offset Ground | 250 mV above (–) SENSE; provides bias headroom for ground amplifier while preserving high-impedance sensing |
| VREF (Pin 7) | Trimmed Reference Output | 2.0 V ±1.25% bandgap reference; used as error amplifier reference and adjustable by ±100 mV via ADJ circuit |
| ISET (Pin 8) | Optocoupler Drive Current Set | Sinks 0–20 mA; configured with external resistor to ground to set opto LED current for isolated feedback |
| STATUS INDICATE (Pin 16) | Master Status Flag | Open-collector output pulled low only when module is designated master; requires external pull-up for logic-level signaling |
Key Features
| Feature | Design Value |
|---|---|
| Fully differential high-Z voltage sensing | Enables accurate remote sensing at pins 11–12 without loading the feedback divider, critical for high-precision regulation |
| Accurate current amplifier (20× gain) | Converts shunt voltage to proportional bus signal with <600 µV/V common-mode drift, ensuring stable sharing across line/load |
| Optocoupler driving capability | Integrated drive amplifier delivers 0–20 mA into 4–35 V bias rails, eliminating need for external transistor or driver stage |
| 1.25% trimmed reference | Reduces system-level calibration burden and improves initial output voltage accuracy without external trimming resistors |
| Master status indication | Pin 16 open-collector output simplifies fault detection and diagnostics in multi-module systems without added logic |
Applications
| Telecom Power Systems | Industrial DC Power Distribution |
|---|---|
Use Scenario: Parallel redundant 48 V DC-DC converters feeding telecom shelf backplanes with strict current balance requirements. IC Role / Device Role / Timing Role: Load share controller managing per-module reference trim via current-share bus to enforce ±2.5% current matching. Use Value: Prevents thermal runaway and extends converter lifetime by eliminating single-module overload in N+1 redundant architectures. | Use Scenario: Modular 24 V/48 V industrial power supplies where field-replaceable modules must share load without firmware coordination. IC Role / Device Role / Timing Role: Analog current-sharing supervisor using differential sensing and opto-coupled feedback to maintain regulation across isolated modules. Use Value: Enables hot-swap capability and seamless module replacement while maintaining output stability and load continuity. |
| Medical Equipment Power Supplies | Test & Measurement Instrumentation |
Use Scenario: High-reliability AC/DC front-end with dual-output modules powering sensitive analog and digital subsystems. IC Role / Device Role / Timing Role: Output-side controller coordinating voltage regulation and current sharing between independent switching modules. Use Value: Meets IEC 60601 leakage and redundancy requirements by ensuring no single point of failure dominates current delivery. | Use Scenario: Programmable DC power supply with scalable output current achieved via paralleled modular stages. IC Role / Device Role / Timing Role: Precision load balancer using 2.0 V ±1.25% reference and 20× current gain to minimize inter-channel current deviation. Use Value: Achieves ≤0.5% full-scale current mismatch across channels, supporting calibrated multi-range output specifications. |
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 operating temperature range (–40°C to 85°C); identical pinout, architecture, and electrical specs except temp grade | Preferred for extended-temperature industrial or automotive-adjacent environments where ambient exceeds 70°C | Select UC2907DWTR when operating beyond 70°C; otherwise UC3907DWTR suffices for commercial-grade systems |
| LTC4370CMS#PBF | Higher integration: includes integrated MOSFET drivers, reverse-current blocking, and auto-failover; requires external shunt but no opto interface | Targets modern high-efficiency DC systems needing fault protection and bidirectional current control, not legacy opto-coupled designs | Choose LTC4370 when replacing aging designs with new layouts allowing MOSFET-based isolation and enhanced protection features |
Compared with UC2907DWTR, UC3907DWTR offers lower-cost commercial-temp qualification; compared with LTC4370, it retains legacy optocoupler compatibility and simpler analog tuning but lacks integrated protection and MOSFET control.
Availability
UC3907DWTR is available at Aetrix Electronics and suitable for telecom power systems, industrial DC distribution, medical equipment power supplies, and test & measurement instrumentation requiring stable component supply across long production lifecycles.
Supply support for UC3907DWTR 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 specializing in analog, embedded processing, and power management technologies with over 50 years of innovation in power control ICs.
The UCx907 family was engineered specifically for analog current-sharing in paralleled DC-DC modules, targeting high-reliability distributed power architectures where precision, noise immunity, and optocoupler compatibility are essential.
FAQ
What is the primary function of the UC3907DWTR in a power system?
The UC3907DWTR serves as an analog load share controller that enables multiple independent DC-DC power modules to operate in parallel with precise current balancing. It achieves this by comparing each module's sensed output current to a shared bus signal, adjusting individual reference voltages to force ±2.5% current matching. The UC3907DWTR resides on the output side of each module and supports both isolated (via optocoupler) and direct feedback configurations.
Does the UC3907DWTR require external components to function as a current-sharing controller?
Yes - the UC3907DWTR requires external components including a current-sense shunt resistor (for differential input at pins 2–3), a voltage-divider network (for feedback at pins 11–12), a current-setting resistor from ISET (pin 8) to ground (to configure optocoupler drive current), and an external capacitor on ADJ OUT (pin 13) to stabilize the adjust amplifier loop. No external trimming is needed for the 2.0 V ±1.25% reference, but compensation components must be selected per application layout and stability requirements.
Can the UC3907DWTR operate without connection to the current-share bus?
Yes - the UC3907DWTR functions as a standalone voltage regulator controller even when the current-share bus is open or shorted to ground. In such cases, the adjust amplifier output remains at its nominal level, leaving the 2.0 V reference unchanged, and the status-indicate pin stays high. This fail-safe behavior ensures continued regulation and graceful degradation in multi-module systems during bus faults.
What is the role of the ARTIFICIAL GND (Pin 6) in the UC3907DWTR?
The ARTIFICIAL GND (Pin 6) provides a stable 250 mV offset above the (–) SENSE reference (Pin 4), enabling the ground amplifier to sink all internal bias and operating currents while preserving the high-impedance nature of the (–) SENSE input. This architecture eliminates ground-loop errors and allows accurate remote sensing without compromising noise immunity or common-mode rejection - a critical feature for precision current sharing in electrically noisy power systems.
Is the UC3907DWTR pin-compatible with other members of the UCx907 family?
Yes - the UC3907DWTR is fully pin-compatible with UC2907DWTR and UC1907N variants in the same SOIC-16 (DW) or PDIP-16 (N) packages. Electrical functionality, pin assignments, and internal architecture are identical across the family; only the specified operating temperature range differs (0°C–70°C for UC3907, –40°C–85°C for UC2907, –55°C–125°C for UC1907). This allows direct substitution when ambient conditions permit.
UC3907DWTR 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
UC3907DWTR FAQ
1.How can I place an order for UC3907DWTR through Aetrix?
Please submit a Request for Quotation (RFQ) for UC3907DWTR 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 UC3907DWTR reliable?
The price and inventory of UC3907DWTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UC3907DWTR is usually 5 days.
3.What payment methods are accepted for UC3907DWTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UC3907DWTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UC3907DWTR?
UC3907DWTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UC3907DWTR 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 UC3907DWTR?
For technical support, including UC3907DWTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UC3907DWTR requirements.
6.How does Aetrix verify that UC3907DWTR is sourced from the original manufacturer or authorized distributors?
All UC3907DWTR 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 UC3907DWTR meets industry standards.
7.What is the process for return or replacement of UC3907DWTR?
All UC3907DWTR units undergo pre-shipment inspection (PSI). If there is an issue with UC3907DWTR, 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 UC3907DWTR part is unused and in its original packaging.
Return procedure for UC3907DWTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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