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Texas Instruments UCC3911DPTR-3
- Part No.:
- UCC3911DPTR-3
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
UCC3911DPTR-3.pdf
- Description:
- IC BATT PROT LI-ION 2CELL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,461
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Product details
Overview
UCC3911DPTR-3 from Texas Instruments is a two-cell lithium-ion/lithium-polymer battery pack protector IC with integrated series FET switch, 4.25–4.35 V overvoltage threshold, 2.42–2.58 V undervoltage threshold, 3-A continuous current capacity, and 20 µA quiescent current - used in portable electronics to prevent cell damage during charge/discharge cycles.
For engineers reviewing the UCC3911DPTR-3 datasheet, UCC3911DPTR-3 pinout, UCC3911DPTR-3 application, or UCC3911DPTR-3 equivalent, this page delivers verified functional role, terminal-level design meaning, real-world protection timing behavior, and validated alternative options for battery management system design.
Technical Context
The UCC3911DPTR-3 implements dual-threshold voltage monitoring (OV/UV) with hysteresis-based state machine control of an internal power FET, enabling bidirectional current flow in normal operation but enforcing unidirectional conduction during overvoltage (discharge-only) or undervoltage (charge-only) states. Its feedback loop powers down the op-amp outside protection states to minimize battery drain.
Short-circuit protection uses a user-configurable delay via CDLY pin capacitor (nominal 100 µs, extendable), while thermal shutdown activates at 165°C. The CE pin enables assembly-mode disable with 4 µA sleep current, and LPWARN provides early low-power warning at 3.0 V per cell.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Overvoltage Threshold | 4.25–4.35 V per cell - sets trip point for halting charge when either cell exceeds safe voltage limit |
| Undervoltage Threshold | 2.42–2.58 V per cell - triggers discharge cutoff to prevent deep discharge damage |
| Continuous Current Rating | 3 A - supports typical PDA/camcorder load profiles without external FETs |
| Quiescent Current | 20 µA - enables multi-year shelf life in battery packs before first use |
| Short-Circuit Delay | 100 µs nominal - allows brief inrush currents while blocking sustained faults |
| Operating Temperature | –20°C to 70°C - matches standard Li-ion battery environmental envelope |
| Thermal Shutdown | 165°C - protects device and cells under sustained overload or poor heatsinking |
Pinout & Package
UCC3911DPTR-3 is housed in a 16-pin SOIC (D) package with exposed substrate pads (SUBS pins 4, 5, 12, 13) for thermal management. The package supports surface-mount assembly and requires electrically isolated heatsinking on SUBS pins for high-current operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| B0 (10,11) | Negative terminal reference | Connects to bottom cell's negative electrode; serves as common reference for all voltage sensing and FET source |
| B1 (14) | Middle node sense | Monitors junction between two series cells to detect individual cell overvoltage/undervoltage |
| B2 (16) | Positive terminal reference | Connects to top cell's positive electrode and user-facing pack output (+) |
| GND (6,7) | User output terminal | Provides second user-facing pack terminal (–); FET connects GND to B0 to enable/disconnect load/charger |
| CDLY (15) | SCP timing control | Accepts external capacitor to extend short-circuit trip delay beyond 100 µs for capacitive load compatibility |
| CE (9) | Assembly enable/disable | Pulling low disables FET and reduces supply current to ~4 µA for safe battery pack manufacturing |
| LPWARN (8) | Low-power alert | Active-high signal asserted when any cell drops below 3.0 V - enables host-system battery status indication |
| OV (2) | Overvoltage status | Active-low flag indicating one or both cells exceed VOV - inhibits further charging |
| UV (3) | Undervoltage status | Active-low flag indicating one or both cells fall below VUV - inhibits further discharging |
Key Features
| Feature | Design Value |
|---|---|
| Integrated series FET switch | Eliminates need for external MOSFETs and associated gate drive circuitry, reducing BOM count and PCB area |
| Hysteresis-based OV/UV recovery | Prevents oscillation during marginal cell voltage conditions by requiring decay to VOVR (3.70–3.90 V) before resuming normal operation |
| Bi-directional current control logic | Enables full conduction in normal mode, then enforces charge-only or discharge-only paths during protection events |
| Sleep mode activation | Reduces current to ~3 µA when UV is asserted, minimizing self-discharge during long-term storage |
| Electrically isolated substrate pads | Four SUBS pins allow thermal coupling to heatsink without electrical connection to ground or other signals |
Applications
| Portable Digital Assistant (PDA) | Digital Camcorder |
|---|---|
Use Scenario: Powering handheld computing devices with dual-cell Li-ion packs requiring long runtime and safety-critical protection. IC Role / Device Role / Timing Role: Primary battery protection controller managing overvoltage, undervoltage, and short-circuit events in real time. Use Value: Prevents irreversible cell degradation during frequent partial-charge cycles and accidental overdischarge during standby. | Use Scenario: Supplying burst-capable power to video recording systems with high peak current demands. IC Role / Device Role / Timing Role: Bidirectional current supervisor that permits full discharge during recording while blocking unsafe charge above 4.35 V. Use Value: Enables reliable operation across temperature extremes (–20°C to 70°C) without external FET derating or thermal runaway risk. |
| Digital Camera | Private Mobile Radio (PMR) |
Use Scenario: Supporting flash-intensive imaging workflows where rapid charge/discharge cycles stress battery cells. IC Role / Device Role / Timing Role: Cell-balancing-agnostic protector detecting per-cell voltage excursions independent of pack matching quality. Use Value: Avoids false trips during flash capacitor charging by allowing configurable short-circuit delay via CDLY capacitor. | Use Scenario: Delivering mission-critical power to two-way radios used in industrial or public safety environments. IC Role / Device Role / Timing Role: Safety-enabling component that asserts LPWARN at 3.0 V to trigger low-battery alerts before UV shutdown. Use Value: Extends usable runtime by 10–15% compared to fixed-threshold protectors through precise 2.50 V undervoltage cutoff. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ29700DRVR | Single-cell focus; lower OV threshold (4.25 V typ); no CDLY programmability; 1.5 µA IQ | Not suitable for two-cell stacks; lacks middle-node (B1) sensing required for per-cell monitoring | Select only for single-cell Li-ion designs where UCC3911DPTR-3's dual-cell architecture is unnecessary |
| MP2617GJ-Z | Integrated charger + protector; 4.35 V OV; supports 2-cell but requires external FETs; 30 µA IQ | Combines charging and protection functions - increases complexity if only protection is needed | Choose when system-level integration of charge control and protection justifies added cost and layout overhead |
Compared with BQ29700DRVR and MP2617GJ-Z, the UCC3911DPTR-3 uniquely delivers true two-cell per-cell voltage monitoring with integrated FET, zero external power components, and configurable short-circuit response - making it optimal for compact, cost-sensitive dual-cell battery packs where standalone protection is required.
Availability
UCC3911DPTR-3 is available at Aetrix Electronics and suitable for portable digital assistant, digital camcorder, and private mobile radio applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for UCC3911DPTR-3 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 leader delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, precision, and energy efficiency.
The UCC3911DPTR-3 belongs to TI's battery management IC portfolio designed specifically for protection of multi-cell lithium-based battery packs in space-constrained portable electronics.
FAQ
What is the exact overvoltage threshold range for UCC3911DPTR-3?
The UCC3911DPTR-3 has a guaranteed overvoltage threshold range of 4.25 V (min) to 4.35 V (max) per cell at 25°C, with typical value 4.30 V. This range is factory-trimmed and specified in the SLUS429B datasheet Table 1 under "UCC3911DP–3" row. It ensures safe charging termination before lithium-plating occurs on anode surfaces.
Does UCC3911DPTR-3 require external FETs for operation?
No, UCC3911DPTR-3 integrates a series power FET switch on-die, eliminating the need for external MOSFETs, gate drivers, or current-sense resistors. This integration reduces bill-of-materials cost and PCB footprint while improving reliability - confirmed in the device description and "No External FETs Required" feature bullet of the SLUS429B datasheet.
How does the CE pin function in UCC3911DPTR-3 during battery pack assembly?
The CE pin on UCC3911DPTR-3 disables the internal FET when held low (connected to B0), reducing supply current to ~4 µA. This allows safe electrical assembly of the battery pack; the final step is cutting the CE-to-B0 trace to activate the device. This behavior is documented in the "CE" terminal description and Application Information section of SLUS429B.
What is the purpose of the CDLY pin on UCC3911DPTR-3?
The CDLY pin on UCC3911DPTR-3 sets the delay time for short-circuit protection activation. With no capacitor, delay is 100 µs; adding capacitance between CDLY and B0 extends delay to accommodate high-peak loads like camera flash. The delay equation tDLY = 25 × (25 + CDLY[pF]) × 0.4 × VB2 is provided in SLUS429B Section 5.
Can UCC3911DPTR-3 monitor individual cell voltages in a two-cell stack?
Yes, UCC3911DPTR-3 monitors individual cell voltages using three dedicated sense inputs: B0 (bottom cell negative), B1 (midpoint between cells), and B2 (top cell positive). This enables independent overvoltage and undervoltage detection per cell - a core capability described in the Functional Block Diagram and Terminal Functions table of SLUS429B.
UCC3911DPTR-3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Battery Protection
- Battery Chemistry:
- Lithium Ion/Polymer
- Number of Cells:
- 2
- Fault Protection:
- Over/Under Voltage, Short Circuit
- Interface:
- -
- Operating Temperature:
- -20°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
UCC3911DPTR-3 FAQ
1.How can I place an order for UCC3911DPTR-3 through Aetrix?
Please submit a Request for Quotation (RFQ) for UCC3911DPTR-3 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 UCC3911DPTR-3 reliable?
The price and inventory of UCC3911DPTR-3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC3911DPTR-3 is usually 5 days.
3.What payment methods are accepted for UCC3911DPTR-3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCC3911DPTR-3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCC3911DPTR-3?
UCC3911DPTR-3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCC3911DPTR-3 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 UCC3911DPTR-3?
For technical support, including UCC3911DPTR-3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC3911DPTR-3 requirements.
6.How does Aetrix verify that UCC3911DPTR-3 is sourced from the original manufacturer or authorized distributors?
All UCC3911DPTR-3 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 UCC3911DPTR-3 meets industry standards.
7.What is the process for return or replacement of UCC3911DPTR-3?
All UCC3911DPTR-3 units undergo pre-shipment inspection (PSI). If there is an issue with UCC3911DPTR-3, 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 UCC3911DPTR-3 part is unused and in its original packaging.
Return procedure for UCC3911DPTR-3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
UCC3911DPTR-3 Tags
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