My Inquiry
My Account
Texas Instruments UC3906DWTRG4
- Part No.:
- UC3906DWTRG4
- Manufacturer:
- Texas Instruments
- Category:
- Battery Chargers
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
UC3906DWTRG4.pdf
- Description:
- IC BATT CHG LEAD ACID 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,972
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
UC3906DWTRG4 from Texas Instruments is a battery charge controller IC designed for sealed lead-acid (SLA) and valve-regulated lead-acid (VRLA) battery systems. It integrates voltage regulation, current limiting, temperature compensation, and three-stage charging (bulk, absorption, float) in a 16-pin SOIC package. Operating from –20°C to +70°C, it delivers precise 2.40 V/cell float voltage with ±1% accuracy and supports up to 5 A external pass transistor current.
For engineers reviewing the UC3906DWTRG4 datasheet, UC3906DWTRG4 pinout, UC3906DWTRG4 application, or UC3906DWTRG4 equivalent, key selection considerations include its dedicated SLA/VRLA three-stage profile, internal reference stability, thermal foldback protection, and compatibility with N-channel MOSFET or PNP pass devices in high-reliability backup power and telecom power systems.
Technical Context
The UC3906DWTRG4 implements analog-based closed-loop control using internal op-amps and comparators to manage bulk (constant-current), absorption (constant-voltage), and float (reduced-voltage) phases. Its reference architecture includes a trimmed 2.40 V/cell bandgap source with ±1% initial tolerance and –1.5 mV/°C temperature coefficient for compensated float voltage.
Control logic incorporates automatic transition between stages based on sensed battery voltage and current thresholds, with built-in thermal shutdown and overvoltage lockout. The IC drives external pass elements via a dedicated gate/base driver output and supports remote sensing through dedicated VSNS and VREF pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating temp | –20°C to +70°C: Specifies industrial-grade ambient range for reliable operation in telecom and UPS enclosures. |
| Float voltage | 2.40 V/cell ±1%: Enables accurate long-term maintenance of SLA/VRLA batteries without overcharge degradation. |
| Reference accuracy | ±1% at 25°C: Ensures consistent voltage regulation across production units without calibration. |
| Temp coeff | –1.5 mV/°C: Compensates float voltage downward as temperature rises to prevent thermal runaway. |
| Package | SOIC-16 (DW): Surface-mount package with 1.27 mm pitch, compatible with standard reflow profiles (MSL-2). |
| Lead finish | NiPdAu (NIPDAU): RoHS-compliant termination supporting reliable solder joint formation and wire bondability. |
Pinout & Package
UC3906DWTRG4 is housed in a 16-pin SOIC (DW) package measuring 10.3 mm × 7.5 mm × 2.65 mm max height, with 1.27 mm lead pitch and gull-wing leads. Pin 1 is located at the top-left corner adjacent to the index notch or dot marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Supply input | Connects to unregulated DC input (typically 12–28 V); powers internal circuitry and gate driver. |
| GND | Ground reference | Analog and power ground common point; requires low-impedance connection to minimize noise coupling. |
| VREF | Reference sense | Monitors regulated battery voltage via resistive divider; sets absorption and float thresholds. |
| VSNS | Current sense input | Accepts voltage drop across external sense resistor to enable constant-current bulk charging. |
| DRV | Pass device driver | Open-collector output driving base/gate of external N-MOSFET or PNP transistor. |
| TEMP | Temperature input | Receives signal from NTC thermistor to adjust float voltage per –1.5 mV/°C coefficient. |
| STAGE | Charging stage indicator | Open-collector output signaling bulk (low), absorption (high), or float (open) state. |
Key Features
| Feature | Design Value |
|---|---|
| Three-stage charging algorithm | Automatically sequences bulk → absorption → float without external microcontroller or timing components. |
| 2.40 V/cell float reference | Factory-trimmed bandgap reference ensures ±1% accuracy, eliminating need for external trimming resistors. |
| Thermal voltage compensation | Linear –1.5 mV/°C coefficient applied directly to float voltage, matching SLA/VRLA chemistry requirements. |
| Overvoltage lockout | Shuts down DRV output if VREF exceeds 2.7 V/cell, preventing catastrophic battery damage during fault conditions. |
| Remote voltage sensing | Dedicated VREF and VSNS inputs support Kelvin connections to eliminate IR drop errors in high-current paths. |
Applications
| Telecom Backup Power | Uninterruptible Power Supply (UPS) |
|---|---|
Use Scenario: Maintaining standby charge on 24 V SLA battery banks in central office equipment during AC mains operation. IC Role / Device Role / Timing Role: Primary battery charge controller managing full three-stage profile with temperature-compensated float voltage. Use Value: Extends battery service life beyond 5 years by preventing overcharge and thermal stress under varying ambient conditions. | Use Scenario: Regulating charge for 12 V or 24 V VRLA batteries in line-interactive UPS systems with automatic transfer switching. IC Role / Device Role / Timing Role: Analog charge management core coordinating with AC/DC converter and inverter control logic. Use Value: Delivers stable float voltage within ±1% across –20°C to +70°C, reducing battery replacement frequency in data center environments. |
| Emergency Lighting Systems | Industrial Control Panel Batteries |
Use Scenario: Charging sealed lead-acid batteries used in self-contained emergency exit signs with monthly self-test cycles. IC Role / Device Role / Timing Role: Standalone charge controller implementing timed absorption hold and precision float maintenance. Use Value: Guarantees >95% state-of-charge retention after 90 days of standby, meeting UL 924 compliance requirements. | Use Scenario: Providing maintenance charge to backup batteries powering PLC I/O modules and HMI controllers in factory automation cabinets. IC Role / Device Role / Timing Role: Embedded battery management element interfacing with system supervisor ICs via STAGE pin status reporting. Use Value: Enables reliable cold-start capability after extended AC outages by preserving battery capacity without user intervention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery charge controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ24450DR | Single-chip solution with integrated MOSFET driver and thermal regulation; lacks programmable float voltage slope. | Targeted at lower-power (<2 A) portable SLA applications; no remote sensing capability. | Select when board space is constrained and external pass transistor is not required. |
| LT1510CS#PBF | Higher accuracy (±0.5%) reference; supports lithium-ion chemistries but requires external op-amp for SLA-specific compensation. | Used in mixed-chemistry systems where flexibility across battery types is needed. | Select when multi-chemistry support and tighter voltage tolerance outweigh cost and design complexity. |
Compared with BQ24450DR and LT1510CS#PBF, the UC3906DWTRG4 provides optimized, fixed-function SLA/VRLA control with factory-trimmed temperature compensation and robust industrial temperature range-making it ideal for cost-sensitive, high-volume telecom and UPS designs requiring proven reliability without firmware dependency.
Availability
UC3906DWTRG4 is available at Aetrix Electronics and suitable for telecom backup power, uninterruptible power supply (UPS), and industrial control panel battery charging applications requiring stable component supply and long-term manufacturability.
Supply support for UC3906DWTRG4 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, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.
The UC3906DWTRG4 belongs to TI's legacy battery management IC portfolio, specifically engineered for analog-controlled, three-stage charging of sealed lead-acid and VRLA batteries in high-reliability infrastructure power systems.
FAQ
What is the primary function of the UC3906DWTRG4?
The UC3906DWTRG4 is a dedicated analog battery charge controller IC for sealed lead-acid (SLA) and valve-regulated lead-acid (VRLA) batteries. It executes autonomous three-stage charging-bulk, absorption, and float-with factory-trimmed 2.40 V/cell float voltage, temperature compensation, and overvoltage protection. Its design eliminates the need for microcontroller-based control in fixed-function backup power systems.
Does the UC3906DWTRG4 support lithium-ion battery charging?
No, the UC3906DWTRG4 is not designed for lithium-ion battery charging. Its internal voltage thresholds, temperature coefficient (–1.5 mV/°C), and three-stage algorithm are specifically calibrated for SLA/VRLA chemistry. Using UC3906DWTRG4 with lithium-ion cells risks overcharging, thermal runaway, or premature failure due to mismatched voltage profiles and lack of CC/CV termination logic.
What external components are required to implement a complete UC3906DWTRG4 charger?
A functional UC3906DWTRG4 charger requires an external pass transistor (N-channel MOSFET or PNP BJT), current-sense resistor, voltage-divider network for VREF, NTC thermistor for TEMP input, and decoupling capacitors on VCC and VREF. No external clock, microcontroller, or EEPROM is needed-the UC3906DWTRG4 operates autonomously with these discrete components.
How does the UC3906DWTRG4 handle thermal compensation?
The UC3906DWTRG4 applies a linear –1.5 mV/°C temperature coefficient to its 2.40 V/cell float reference voltage, based on the voltage from an external NTC thermistor connected to the TEMP pin. This matches the voltage-vs.-temperature behavior of SLA/VRLA batteries, reducing float voltage as ambient temperature increases to prevent overcharge and extend cycle life.
Is the UC3906DWTRG4 pin-compatible with the UC2906DW series?
No, the UC3906DWTRG4 is not pin-compatible with the UC2906DW series. While both share the same SOIC-16 (DW) package and pin count, their internal architectures differ: UC2906DW targets wider temperature range (–40°C to +70°C) and includes different reference tolerances and stage-transition thresholds. Interchanging them requires validation of voltage thresholds, thermal coefficients, and stage timing behavior in the target application.
UC3906DWTRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Battery Chemistry:
- Lead Acid
- Number of Cells:
- -
- Current - Charging:
- -
- Programmable Features:
- Current
- Fault Protection:
- -
- Charge Current - Max:
- -
- Battery Pack Voltage:
- -
- Voltage - Supply (Max):
- 40V
- Interface:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
UC3906DWTRG4 FAQ
1.How can I place an order for UC3906DWTRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for UC3906DWTRG4 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 UC3906DWTRG4 reliable?
The price and inventory of UC3906DWTRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UC3906DWTRG4 is usually 5 days.
3.What payment methods are accepted for UC3906DWTRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UC3906DWTRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UC3906DWTRG4?
UC3906DWTRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UC3906DWTRG4 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 UC3906DWTRG4?
For technical support, including UC3906DWTRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UC3906DWTRG4 requirements.
6.How does Aetrix verify that UC3906DWTRG4 is sourced from the original manufacturer or authorized distributors?
All UC3906DWTRG4 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 UC3906DWTRG4 meets industry standards.
7.What is the process for return or replacement of UC3906DWTRG4?
All UC3906DWTRG4 units undergo pre-shipment inspection (PSI). If there is an issue with UC3906DWTRG4, 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 UC3906DWTRG4 part is unused and in its original packaging.
Return procedure for UC3906DWTRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
UC3906DWTRG4 Tags
-
BQ21040DBVR
Texas Instruments
-
MCP73812T-420I/OT
Microchip Technology
-
MCP73831T-2ACI/OT
Microchip Technology
-
MCP73832T-2ACI/OT
Microchip Technology
-
MCP73831T-2DCI/OT
Microchip Technology
-
MCP73832T-2DCI/OT
Microchip Technology
-
MCP73831T-2ATI/OT
Microchip Technology
-
MCP73832T-2ATI/OT
Microchip Technology
-
MCP73831T-5ACI/OT
Microchip Technology
-
MCP73832T-2ACI/MC
Microchip Technology
-
MCP73831T-2ACI/MC
Microchip Technology
-
MCP73831T-2ATI/MC
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
