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Texas Instruments UCC3911DP-2
- Part No.:
- UCC3911DP-2
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
UCC3911DP-2.pdf
- Description:
- IC BATT PROT LI-ION 2CELL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,572
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Product details
Overview
UCC3911DP-2 from Texas Instruments is a two-cell lithium-ion/lithium-polymer battery pack protector IC with integrated series FET switch, overvoltage threshold of 4.20–4.30 V per cell, undervoltage threshold of 2.42–2.58 V per cell, 3-A continuous current capacity, and 20 µA quiescent supply current. It protects portable electronics battery packs against overcharge, overdischarge, and short-circuit faults without external FETs.
For engineers reviewing the UCC3911DP-2 datasheet, UCC3911DP-2 pinout, UCC3911DP-2 application, or UCC3911DP-2 equivalent, this device serves as a self-contained protection solution for dual-cell Li-Ion/Li-Pol packs in space-constrained, low-power portable systems requiring precise voltage monitoring and bidirectional current control.
Technical Context
The UCC3911DP-2 implements a precision bandgap-based voltage reference to monitor individual cell voltages at B0, B1, and B2 terminals, triggering state transitions when thresholds are crossed. Its internal state machine controls an on-chip FET switch using charge-pump gate drive in normal operation and negative feedback loops during overvoltage (allowing only discharge) or undervoltage (allowing only charge) states.
Short-circuit protection activates within 100 µs (nominal) and is user-adjustable via CDLY capacitor; thermal shutdown engages at 165°C. The device enters sleep mode (<4 µA) during undervoltage lockout and supports chip enable (CE) for assembly-safe initialization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Overvoltage Threshold | 4.20–4.30 V per cell - sets precise upper voltage limit before disabling charging to prevent Li-Ion cell degradation. |
| Undervoltage Threshold | 2.42–2.58 V per cell - prevents deep discharge that causes irreversible capacity loss in Li-Ion cells. |
| Continuous Current Rating | 3 A - supports typical load currents in PDAs, digital cameras, and camcorders without external FETs. |
| Quiescent Supply Current | 20 µA - minimizes self-discharge during storage and standby, extending shelf life of sealed battery packs. |
| Short-Circuit Delay | 100 µs nominal - fast response to catastrophic faults while allowing programmable extension via CDLY capacitor. |
| Operating Temperature | –20°C to +70°C - matches standard Li-Ion battery operating and storage envelope. |
| Thermal Shutdown | 165°C - safeguards device and pack under sustained overload or high-temperature ambient conditions. |
Pinout & Package
UCC3911DP-2 is housed in a 16-pin SOIC (D) package with exposed substrate pads (SUBS) for thermal management. The package features dual GND pins (6, 7), dual B0 pins (10, 11), and quad SUBS pins (4, 5, 12, 13) tied internally to the die substrate and intended for isolated heat sinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| B0 (10, 11) | Negative terminal connection point | Connects to bottom of lower cell; serves as common reference and current return path for both charge and discharge. |
| B1 (14) | Mid-point cell junction sense | Monitors voltage at interface between lower and upper cell to detect individual cell over/undervoltage. |
| B2 (16) | Positive terminal connection point | Connects to top of upper cell; carries full pack voltage (up to 8.4 V) and supplies internal circuitry. |
| GND (6, 7) | User-accessible output terminal | Second pack output terminal; FET connects GND to B0 to enable/disabled bidirectional current flow. |
| CDLY (15) | Short-circuit delay timing input | Accepts external capacitor to extend fault response time and avoid nuisance tripping during capacitive load surges. |
| CE (9) | Chip enable control | Pulling CE low disables FET and reduces supply current to ~4 µA, enabling safe battery pack assembly and long-term storage. |
| OV (2) | Active-low overvoltage status flag | Signals overvoltage condition; drives light loads only and initiates discharge-only FET control mode. |
| UV (3) | Active-low undervoltage status flag | Signals undervoltage condition; triggers sleep mode and enables charge-only FET control to preserve cell health. |
| LPWARN (8) | Low-power warning output | Asserts high when either cell drops below 3.0 V - provides early user alert before UV lockout occurs. |
| SUBS (4, 5, 12, 13) | Substrate thermal connection | Internally tied to die backside; must connect to electrically isolated heatsink to manage power dissipation at high current. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated series FET switch | Eliminates need for external MOSFETs and associated gate-drive components, reducing BOM count and PCB area in compact battery packs. |
| Cell-level voltage monitoring | Detects overvoltage/undervoltage on each cell independently via B0/B1/B2 inputs, preventing imbalance-induced failure in series-connected Li-Ion stacks. |
| Programmable short-circuit delay | Capacitor on CDLY pin extends trip time beyond 100 µs to accommodate high-peak transient loads without false shutdown. |
| Bi-directional current control logic | Enforces charge-only or discharge-only conduction during fault states, enabling safe cell recovery without manual intervention. |
| Assembly-safe chip enable (CE) | Allows factory programming and mechanical assembly with FET disabled; final trace cut activates protection logic with <4 µA leakage. |
Applications
| Portable Digital Assistants (PDAs) | Digital Cameras |
|---|---|
|
Use Scenario: Power management in handheld PDAs with dual-cell Li-Ion battery packs subject to variable CPU and display loads. IC Role / Device Role / Timing Role: Primary battery protection controller enforcing per-cell voltage limits and blocking short-circuit currents. Use Value: Prevents field failures due to cell overvoltage during AC charging or undervoltage during high-current backlight use, extending usable runtime and cycle life. |
Use Scenario: Compact digital camera battery packs experiencing burst current demands from flash charging and image sensor readout. IC Role / Device Role / Timing Role: Dual-cell voltage supervisor and short-circuit protector with sub-100 µs fault response. Use Value: Enables reliable flash operation by tolerating >3-A peak loads while suppressing destructive short circuits caused by connector arcing or PCB trace damage. |
| Camcorders | Private Mobile Radios (PMRs) |
|
Use Scenario: High-drain camcorder battery packs powering motorized zoom, image stabilization, and recording circuits. IC Role / Device Role / Timing Role: Integrated protection IC managing bidirectional current flow and thermal safety during extended video capture. Use Value: Maintains stable pack voltage under dynamic 2–3 A loads and prevents thermal runaway via substrate temperature sensing and 165°C shutdown. |
Use Scenario: Ruggedized PMR battery packs subjected to vibration, temperature extremes, and accidental terminal shorts. IC Role / Device Role / Timing Role: Fault-tolerant protector with isolated SUBS thermal pads and CE-initiated safe assembly sequence. Use Value: Ensures operational continuity in mission-critical communications by avoiding false trips during RF transmit surges and enabling field-replaceable pack design. |
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 focused; lacks B1 mid-point sensing and dual-cell independent OV/UV detection logic. | Requires external circuitry for two-cell stack monitoring; not drop-in for UCC3911DP-2's integrated dual-cell topology. | Select only if redesigning for single-cell architecture or adding discrete cell balancing. |
| MP26123DQ-LF-Z | Includes integrated charger controller and I²C interface; higher quiescent current (45 µA) and no CDLY programmability. | Targets smart battery systems needing host communication; unsuitable for cost-sensitive, standalone protection-only designs. | Choose when system-level battery telemetry and firmware-controlled protection are required. |
Compared with BQ29700DRVR and MP26123DQ-LF-Z, the UCC3911DP-2 delivers purpose-built, minimal-footprint dual-cell protection with unique CDLY-adjustable short-circuit response and substrate thermal pads-making it optimal for legacy portable devices where integration, ultra-low IQ, and mechanical robustness are prioritized over digital control.
Availability
UCC3911DP-2 is available at Aetrix Electronics and suitable for PDA, digital camera, and camcorder applications requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.
Supply support for UCC3911DP-2 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 specializing in analog, embedded processing, and power management technologies, with decades of experience in battery management ICs.
The UCC3911DP-2 belongs to TI's dedicated battery protection product line, engineered specifically for cost-sensitive, high-reliability dual-cell Li-Ion/Li-Pol packs in consumer portable electronics where minimal external components and guaranteed voltage thresholds are critical.
FAQ
What is the overvoltage threshold range for the UCC3911DP-2?
The UCC3911DP-2 has a specified overvoltage threshold range of 4.20 V (minimum) to 4.30 V (maximum) per cell at 25°C, with typical value 4.25 V. This range ensures reliable prevention of lithium-ion cell overcharging while accommodating process variation and temperature drift across the –20°C to +70°C operating range. The UCC3911DP-2 uses an internal precision bandgap reference to maintain this accuracy without external calibration.
How does the UCC3911DP-2 handle short-circuit protection?
The UCC3911DP-2 detects overcurrent conditions with a nominal threshold of 5.25 A and triggers internal FET shutdown after a 100 µs delay. This delay is programmable via an external capacitor on the CDLY pin, allowing designers to extend response time for high-peak transients. The UCC3911DP-2 does not rely on external sense resistors - current detection is integrated and calibrated, ensuring consistent performance across units without layout-dependent tuning.
Can the UCC3911DP-2 be used in single-cell battery packs?
No - the UCC3911DP-2 is explicitly designed for two-series lithium-ion or lithium-polymer cells, requiring three voltage inputs (B0, B1, B2) to monitor individual cell voltages. Its internal logic compares B1–B0 and B2–B1 to enforce per-cell overvoltage and undervoltage limits. Using the UCC3911DP-2 in a single-cell configuration would leave B1 unconnected and disable critical protection functionality, making it unsuitable and unsupported for such applications.
What is the role of the SUBS pins on the UCC3911DP-2?
The four SUBS pins (4, 5, 12, 13) on the UCC3911DP-2 are internally connected to the silicon substrate and serve exclusively as thermal conduction paths - not electrical signal or power nodes. They must be soldered to an electrically isolated copper pad or heatsink to dissipate heat generated by the on-chip FET during 3-A conduction. Connecting SUBS to system ground violates isolation requirements and risks latch-up or thermal instability in the UCC3911DP-2.
Does the UCC3911DP-2 support automatic recovery from overvoltage or undervoltage events?
Yes - the UCC3911DP-2 implements hysteresis-based automatic recovery. After overvoltage lockout, it resumes normal operation only when both cells fall below the overvoltage recovery threshold (3.65–3.85 V). After undervoltage lockout, it exits sleep mode and re-enables charging only when both cells exceed 3.0 V and total pack voltage exceeds 3.7 V. This behavior is intrinsic to the UCC3911DP-2's state machine and requires no external reset or host intervention.
UCC3911DP-2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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
UCC3911DP-2 FAQ
1.How can I place an order for UCC3911DP-2 through Aetrix?
Please submit a Request for Quotation (RFQ) for UCC3911DP-2 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 UCC3911DP-2 reliable?
The price and inventory of UCC3911DP-2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC3911DP-2 is usually 5 days.
3.What payment methods are accepted for UCC3911DP-2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCC3911DP-2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCC3911DP-2?
UCC3911DP-2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCC3911DP-2 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 UCC3911DP-2?
For technical support, including UCC3911DP-2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC3911DP-2 requirements.
6.How does Aetrix verify that UCC3911DP-2 is sourced from the original manufacturer or authorized distributors?
All UCC3911DP-2 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 UCC3911DP-2 meets industry standards.
7.What is the process for return or replacement of UCC3911DP-2?
All UCC3911DP-2 units undergo pre-shipment inspection (PSI). If there is an issue with UCC3911DP-2, 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 UCC3911DP-2 part is unused and in its original packaging.
Return procedure for UCC3911DP-2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
UCC3911DP-2 Tags
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