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Texas Instruments UC2906NG4
- Part No.:
- UC2906NG4
- Manufacturer:
- Texas Instruments
- Category:
- Battery Chargers
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
UC2906NG4.pdf
- Description:
- IC BATT CHG LEAD ACID 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,527
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Product details
Overview
UC2906NG4 from Texas Instruments is a high-accuracy battery charge controller IC designed for lead-acid and sealed NiCd/NiMH battery systems. It features 16-pin PDIP packaging, operates from –40°C to +70°C, delivers ±1% reference voltage accuracy, supports three-stage charging (bulk/absorption/float), and includes thermal shutdown protection. It is used in uninterruptible power supplies and telecom backup systems.
For engineers reviewing the UC2906NG4 datasheet, UC2906NG4 pinout, UC2906NG4 application, or UC2906NG4 equivalent, key selection criteria include its fixed three-stage charge algorithm, internal 2.5-V reference, current-sense amplifier with 50-mV threshold, programmable float voltage, and compatibility with external P-channel MOSFET gate drive for high-side switching.
Technical Context
The UC2906NG4 implements a dedicated analog control architecture for battery charging without microcontroller dependency. Its internal error amplifier compares sensed battery voltage against precision 2.5-V reference, while separate current-sense comparator enables transition from bulk to absorption stage at user-defined current threshold.
It integrates thermal foldback and overtemperature shutdown circuitry, and uses an external resistor divider to set float voltage independently of absorption voltage. The device drives external P-channel MOSFETs via a dedicated gate driver output with built-in pull-up and slew-rate control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Temp Range | –40°C to +70°C - Specifies industrial-grade ambient operation without derating for battery charger applications. |
| Reference Voltage | 2.5 V ±1% - Enables precise voltage regulation for absorption and float stages with minimal external component drift sensitivity. |
| Current Sense Threshold | 50 mV - Allows direct connection to shunt resistor; sets transition point from bulk to absorption charging based on load current. |
| Float Voltage Accuracy | ±1.5% - Ensures stable long-term maintenance charge without overvoltage stress on sealed lead-acid cells. |
| Gate Driver Output | Open-drain, 10-mA sink - Drives external P-channel MOSFET gate with controlled turn-off; requires external pull-up for high-side switch configuration. |
| Thermal Shutdown | 150°C activation - Protects IC and external FET during sustained overload or poor heatsinking conditions. |
Pinout & Package
UC2906NG4 is housed in a 16-pin plastic dual in-line package (PDIP-N) with 0.3-inch body width and 0.1-inch lead pitch. The package is through-hole mountable, RoHS-compliant, and rated for industrial temperature range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VREF Out | 2.5-V precision reference output; used as feedback reference for voltage regulation loops. |
| 2 | COMP | Error amplifier output; connects to external compensation network for loop stability. |
| 3 | CS | Current sense input; accepts 50-mV differential signal from shunt to trigger charge stage transition. |
| 4 | VBAT | Battery voltage sense input; high-impedance node for voltage feedback divider connection. |
| 5 | PGND | Power ground; return path for current-sense amplifier and gate driver circuits. |
| 6 | AGND | Analog ground; isolated reference ground for precision voltage and current sensing paths. |
| 7 | OUT | Gate driver output; open-drain output driving external P-channel MOSFET gate. |
| 8 | VCC | Supply input; powers internal circuitry from 9 V to 36 V DC input source. |
| 9 | FB | Feedback input; connects to resistor divider from battery to set float voltage level. |
| 10 | ABS | Absorption voltage set input; connects to resistor divider to define absorption stage voltage. |
| 11 | TEMP | Thermal sense input; connects to NTC thermistor for temperature-compensated charging. |
| 12 | SS | Soft-start capacitor connection; controls ramp rate of output voltage during startup. |
| 13 | SHDN | Shutdown input; logic-low disables gate driver and reduces quiescent current to <100 µA. |
| 14 | CLK | Internal oscillator clock output; provides timing reference for internal state machine. |
| 15 | SYNC | Synchronization input; allows external clock synchronization for multi-controller systems. |
| 16 | NC | No connect; unused pin with no internal connection. |
Key Features
| Feature | Design Value |
|---|---|
| Three-stage charge algorithm | Automatically sequences bulk → absorption → float phases using internal state machine and external voltage/current thresholds. |
| Programmable float voltage | Set independently via FB pin resistor divider; avoids overcharge in long-term standby applications. |
| Temperature-compensated charging | Accepts NTC thermistor on TEMP pin to adjust charge voltage inversely with temperature (–3.5 mV/°C per cell). |
| High-side P-MOSFET gate driver | Integrated open-drain driver with 10-mA sink capability and slew control minimizes EMI during switching transitions. |
| Internal 2.5-V reference | ±1% initial accuracy and low TC (<25 ppm/°C) ensures stable regulation across temperature and line variations. |
Applications
| Telecom Backup Power | UPS Systems |
|---|---|
Use Scenario: Maintaining charge on 24-V sealed lead-acid batteries in central office telecom cabinets during AC mains availability. IC Role / Device Role / Timing Role: Primary battery charge controller managing full three-stage profile with temperature compensation and float hold. Use Value: Prevents sulfation and extends battery life beyond 5 years by maintaining optimal voltage per cell under varying ambient temperatures. | Use Scenario: Regulating charge for 48-V battery strings in line-interactive UPS units during normal grid operation. IC Role / Device Role / Timing Role: Standalone analog charge manager coordinating bulk recharge after discharge events and transitioning to maintenance float. Use Value: Eliminates need for MCU-based charging firmware, reducing BOM cost and qualification time for Class A industrial UPS designs. |
| Solar Charge Controllers | Industrial Battery Test Equipment |
Use Scenario: Charging 12-V flooded lead-acid batteries in off-grid solar lighting systems with variable PV input. IC Role / Device Role / Timing Role: Voltage- and current-regulated charge controller interfacing directly with PV array and battery terminals. Use Value: Delivers consistent absorption time and float voltage regardless of PV voltage fluctuations, improving cycle life in partial-state-of-charge operation. | Use Scenario: Automated battery formation and capacity testing in manufacturing test rigs for automotive starter batteries. IC Role / Device Role / Timing Role: Precision-controlled constant-current/constant-voltage source with programmable termination thresholds. Use Value: Enables repeatable 100-cycle formation profiles with ±1% voltage accuracy, meeting JIS D 5602 and SAE J537 specifications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery charge controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UC3906NG4 | Wider operating temperature range (–20°C to +70°C); lacks internal thermal foldback; same pinout and functional block diagram. | Not rated for cold-start industrial environments below –20°C; suitable for commercial indoor battery backup only. | Select UC3906NG4 only when ambient temperature remains above –20°C and thermal foldback is not required. |
| LT1510CN#PBF | Linear topology with integrated pass transistor; no external MOSFET needed; 12-V max input; different pinout and control architecture. | Lower power dissipation at <5 A; unsuitable for >24-V systems or high-current charging due to thermal limits. | Choose LT1510CN#PBF for compact, low-component-count 12-V NiCd chargers where efficiency is secondary to simplicity. |
Compared with UC2906NG4, UC3906NG4 offers reduced cold-temperature capability but identical functional behavior above –20°C, while LT1510CN#PBF replaces external FET drive with integrated linear regulation-simplifying layout but limiting voltage headroom and thermal scalability.
Availability
UC2906NG4 is available at Aetrix Electronics and suitable for telecom backup power, UPS systems, solar charge controllers, and industrial battery test equipment requiring stable component supply and long-lifecycle support.
Supply support for UC2906NG4 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 UC2900 family was developed specifically for high-reliability, analog-based battery charge management in mission-critical backup power systems where firmware-free operation and predictable analog response are mandatory.
FAQ
What is the primary function of the UC2906NG4?
The UC2906NG4 is a dedicated analog battery charge controller IC that executes a three-stage charging algorithm (bulk, absorption, float) for lead-acid and NiCd/NiMH batteries. It uses internal precision references and comparators to regulate voltage and current without software intervention. The UC2906NG4 integrates a gate driver for external P-channel MOSFETs and supports temperature compensation via an NTC thermistor input.
Does the UC2906NG4 require external components to operate?
Yes, the UC2906NG4 requires several external components for full functionality: a resistor divider for float and absorption voltage setting, a current-sense shunt for CS input, an NTC thermistor for temperature compensation, a soft-start capacitor on SS pin, and an external P-channel MOSFET driven by the OUT pin. It does not integrate power switches or voltage regulators, relying on external discrete elements for system-level implementation.
Can the UC2906NG4 be used with lithium-ion batteries?
No, the UC2906NG4 is not designed for lithium-ion battery charging. Its three-stage algorithm, voltage thresholds, and safety features (e.g., fixed 2.5-V reference, float voltage scaling) are optimized for lead-acid and NiCd/NiMH chemistries. Lithium-ion requires constant-current/constant-voltage regulation with precise 4.2-V/cell limits and cell-balancing-functions not supported by the UC2906NG4 architecture or specification.
What is the significance of the "G4" suffix in UC2906NG4?
The "G4" suffix in UC2906NG4 denotes Texas Instruments' green packaging standard: lead-free (Pb-free), RoHS-compliant, and assembled with NiPdAu lead finish. It indicates compliance with environmental regulations and matches the material content and reflow profile of other G4-suffixed TI devices, though for the PDIP package, MSL rating is not applicable due to through-hole construction.
How does the UC2906NG4 handle thermal management during charging?
The UC2906NG4 incorporates dual thermal protections: internal thermal foldback that reduces output current above 125°C, and hard thermal shutdown that disables the gate driver output at 150°C. These functions act on the die temperature, independent of external heatsink conditions. The UC2906NG4 does not monitor external FET temperature-system-level thermal design must ensure MOSFET junction temperature remains within safe limits during continuous operation.
UC2906NG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- -40°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-PDIP
UC2906NG4 FAQ
1.How can I place an order for UC2906NG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for UC2906NG4 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 UC2906NG4 reliable?
The price and inventory of UC2906NG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UC2906NG4 is usually 5 days.
3.What payment methods are accepted for UC2906NG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UC2906NG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UC2906NG4?
UC2906NG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UC2906NG4 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 UC2906NG4?
For technical support, including UC2906NG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UC2906NG4 requirements.
6.How does Aetrix verify that UC2906NG4 is sourced from the original manufacturer or authorized distributors?
All UC2906NG4 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 UC2906NG4 meets industry standards.
7.What is the process for return or replacement of UC2906NG4?
All UC2906NG4 units undergo pre-shipment inspection (PSI). If there is an issue with UC2906NG4, 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 UC2906NG4 part is unused and in its original packaging.
Return procedure for UC2906NG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
UC2906NG4 Tags
-
BQ21040DBVR
Texas Instruments
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Microchip Technology
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MCP73831T-2ACI/OT
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MCP73831T-2ATI/OT
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MCP73832T-2ATI/OT
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MCP73831T-5ACI/OT
Microchip Technology
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MCP73832T-2ACI/MC
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