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Texas Instruments UCC3957MTR-1
- Part No.:
- UCC3957MTR-1
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
UCC3957MTR-1.pdf
- Description:
- IC BATT PROT LI-ION 3-4CL 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,893
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Product details
Overview
UCC3957MTR-1 from Texas Instruments is a BiCMOS lithium-ion battery pack protector IC for three- or four-cell stacks, featuring two-tier overcurrent protection, 30-µA typical supply current, 3.5-µA sleep-mode current, and programmable overvoltage thresholds (4.20 V nominal). It controls external P-channel MOSFETs to prevent overcharge, overdischarge, and short-circuit damage in portable power systems.
For engineers reviewing the UCC3957MTR-1 datasheet, UCC3957MTR-1 pinout, UCC3957MTR-1 application, or UCC3957MTR-1 equivalent, key selection considerations include cell-count configuration (CLCNT pin), smart discharge functionality during overvoltage hysteresis, CDLY1/CDLY2 capacitor-programmable blanking times, and compatibility with high-side P-channel FET topologies requiring N-channel level shifters.
Technical Context
The UCC3957MTR-1 implements a continuous internal state machine that monitors individual cell voltages via flying-capacitor sampling across AN1–AN4, compares them against precision reference-based thresholds (VOV = 4.20 V ±25 mV, VUV = 2.6 V ±0.1 V), and drives CHG/DCHG outputs to control external high-side P-channel MOSFETs. It supports both three- and four-cell configurations via CLCNT pin logic.
Its two-tier overcurrent protection uses dual external capacitors (CDLY1, CDLY2) to set first-tier blanking time (tB1 = 50 ms typ. @ 0.1 µF) and second-tier blanking time (tB2 = 400 µs typ. @ 10 pF), with threshold levels of 150 mV (6 A @ 0.025 Ω) and 375 mV (15 A @ 0.025 Ω), enabling hiccup-mode recovery for capacitive load charging while retaining fast short-circuit response.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDD Range | 6.5 V to 20 V - powers IC directly from top of Li-ion stack; supports up to 4-cell (16.8 V max) with margin. |
| Overvoltage Threshold (VOV) | 4.20 V ±25 mV - precise per-cell charge cutoff; hysteresis (VOVR = 4.00 V ±50 mV) prevents oscillation. |
| Undervoltage Threshold (VUV) | 2.6 V ±0.1 V - triggers sleep mode and disables discharge; wake-up occurs when WU > VDD + 50 mV. |
| Supply Current (IDD) | 30 µA typical - enables long-term monitoring without significant pack drain during standby. |
| Sleep Current (ISL) | 3.5 µA typical - ultra-low quiescent draw preserves capacity during storage or deep discharge recovery. |
| Smart Discharge Threshold | 15 mV on BATLO - re-enables CHG FET for discharge-only conduction during overvoltage hysteresis, reducing body-diode loss. |
| First-Tier OC Delay (tB1) | 50 ms typical @ CDLY1 = 0.1 µF - user-adjustable blanking avoids false trips during surge loads. |
| Second-Tier OC Delay (tB2) | 400 µs typical @ CDLY2 = 10 pF - rapid response to hard shorts while maintaining low duty-cycle stress. |
Pinout & Package
UCC3957MTR-1 is housed in a 16-pin SSOP (DBQ) package with 0.64 mm pitch, moisture sensitivity level 2 (260°C peak reflow), and RoHS-compliant green finish (Pb-free, no Sb/Br).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (1) | Primary power input | Connects to top of battery stack; supplies internal regulators (AVDD/DVDD ≈ 7.3 V). |
| CLCNT (2) | Cell-count configuration | Pulled low internally; tie to AN4 for 4-cell mode, to DVDD/AVDD for 3-cell mode. |
| WU (3) | Wake-up input | Accepts voltage > VDD + 50 mV to exit sleep mode; handles >20 V with current limiting. |
| AN1–AN3 (4–6) | Cell voltage sense inputs | Tap points between stacked cells; AN3 tied to AN4 in 3-cell config. |
| AN4 (7) | Reference/common node | Connects to bottom of stack and current-sense resistor; serves as analog ground reference. |
| BATLO (8) | Current-sense input | Monitors voltage drop across external shunt (e.g., 0.025 Ω); enables overcurrent detection. |
| CHGEN (9) | Charge-enable control | Must be pulled high (>1.3 V) to allow charging; weak internal pulldown ensures safe default-off. |
| CDLY1 (10) | First-tier OC timing | Capacitor to AN4 sets blanking time (30–70 ms) and hiccup off-time (≈17× on-time). |
| DCHG (13) | Discharge FET gate driver | Drives high-side P-channel FET; high = FET off (overdischarge protection). |
| CHG (12) | Charge FET gate driver | Drives N-channel level shifter for high-side P-channel charge FET; low = FET off (overcharge). |
| CDLY2 (14) | Second-tier OC timing | Capacitor to AN4 sets fast-blanking window (100–600 µs) for severe overcurrent events. |
| DVDD (16) | Digital supply bypass | Internal 7.3 V rail; requires 0.1 µF capacitor to AN4 for noise suppression. |
| AVDD (15) | Analog supply bypass | Internal 7.3 V rail; requires 0.1 µF capacitor to AN4 for precision reference stability. |
Key Features
| Feature | Design Value |
|---|---|
| Two-tier overcurrent protection | Programmable first-tier (150 mV / 50 ms) and second-tier (375 mV / 400 µs) thresholds enable robust surge handling and short-circuit immunity. |
| Smart discharge during overvoltage | Re-enables charge FET for discharge-only conduction when BATLO > 15 mV, cutting power loss by >98% vs. body-diode operation. |
| Cell-count programmability | Single CLCNT pin selects 3- or 4-cell operation without external logic or firmware changes. |
| Ultra-low sleep current | 3.5 µA typical draw extends shelf life and enables recovery from deep discharge without external intervention. |
| Open-wire fault detection | Internal current sources detect broken AN1–AN3 connections and force overcharge lockout to prevent unsafe charging. |
| Runaway charger tolerance | WU pin and N-channel level shifter (Q3) allow operation with chargers exceeding VDD, limited only by FET's VGS rating. |
Applications
| Power Tool Battery Packs | Medical Portable Monitors |
|---|---|
|
Use Scenario: High-current, multi-cell Li-ion packs subject to repeated surge loads and mechanical vibration-induced cell disconnection. IC Role / Device Role / Timing Role: Primary cell-voltage monitor and FET controller; samples each cell every 8.5 ms to enforce 4.20 V overvoltage and 2.6 V undervoltage limits. Use Value: Smart discharge reduces heat buildup during partial overcharge, extending FET lifetime and enabling compact thermal design. |
Use Scenario: Long-duration, low-power medical devices requiring guaranteed shutdown below safe cell voltage and minimal self-discharge during storage. IC Role / Device Role / Timing Role: Sleep-mode supervisor; enters 3.5 µA state when any cell drops below 2.6 V and wakes only on valid WU signal. Use Value: Prevents irreversible cell damage from deep discharge while preserving >99% of stored energy over 6-month storage. |
| Electric Scooter Battery Modules | Industrial Handheld Scanners |
|
Use Scenario: 4-cell packs exposed to frequent short-circuit faults during motor stall or connector arcing. IC Role / Device Role / Timing Role: Dual-threshold overcurrent manager; first-tier (6 A) tolerates startup surges, second-tier (15 A) clamps hard shorts within 400 µs. Use Value: Hiccup-mode recovery avoids permanent shutdown, allowing automatic resumption after fault clearance. |
Use Scenario: Compact 3-cell Li-ion packs powering barcode scanners with high peak current during laser activation. IC Role / Device Role / Timing Role: Cell-count configurable protector; CLCNT tied to DVDD for 3-cell support and precise 4.20 V per-cell cutoff. Use Value: Ensures full capacity utilization without overcharge risk, meeting IEC 62133 safety compliance for portable electronics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar lithium-ion battery pack protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ77PL900DR | Integrated 4–10 cell monitor with integrated FET drivers; supports daisy-chain communication; higher BOM cost and complexity. | Targets scalable multi-pack systems requiring telemetry; lacks UCC3957MTR-1's ultra-low sleep current (3.5 µA vs. 8 µA). | Choose BQ77PL900DR for designs needing cell balancing or host MCU communication; UCC3957MTR-1 remains optimal for cost-sensitive, standalone 3/4-cell protection. |
| MP2617GQ-Z | Single-chip solution with integrated charge/discharge FETs; fixed 4.25 V OVP; no CLCNT configurability; 12 µA sleep current. | Designed for space-constrained consumer devices; cannot support 3-cell configuration or user-programmable OC delays. | Choose MP2617GQ-Z for simplified layout where 4-cell-only and fixed thresholds are acceptable; UCC3957MTR-1 offers superior flexibility and lower quiescent power. |
Compared with BQ77PL900DR and MP2617GQ-Z, the UCC3957MTR-1 delivers unique value in ultra-low-power standalone protection with hardware-configurable cell count and dual-stage overcurrent timing-critical for industrial tools and medical devices where reliability, longevity, and bill-of-materials simplicity outweigh communication or integration needs.
Availability
UCC3957MTR-1 is available at Aetrix Electronics and suitable for power tool battery packs, medical portable monitors, electric scooter modules, and industrial handheld scanners requiring stable component supply and long-lifecycle support.
Supply support for UCC3957MTR-1 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 expertise in battery management and precision analog ICs.
The UCC3957 product line was designed specifically for high-reliability, discrete-FET-based lithium-ion pack protection in portable industrial and medical equipment-emphasizing ultra-low quiescent current, robust fault handling, and hardware-configurable operation without microcontroller dependency.
FAQ
What is the overvoltage protection threshold for UCC3957MTR-1?
The UCC3957MTR-1 has a nominal overvoltage threshold of 4.20 V per cell, with a tolerance of ±25 mV (min 4.15 V, max 4.25 V) under recommended operating conditions. This threshold is factory-trimmed and applies to all cells monitored via AN1–AN4. The device enters overvoltage lockout when any cell exceeds this value and remains locked until cell voltage falls below the hysteresis threshold of 4.00 V ±50 mV. This specification is confirmed in the SLUS236B datasheet Table 1, "State Transitions" section.
How does the smart discharge feature work in UCC3957MTR-1?
The smart discharge feature in UCC3957MTR-1 allows the CHG output to re-enable the charge FET for discharge-only conduction while the pack remains in overvoltage hysteresis (between 4.00 V and 4.20 V). It activates when the voltage across BATLO exceeds 15 mV - corresponding to ≥0.6 A discharge current with a 0.025 Ω sense resistor. This bypasses the high-loss body diode path, reducing power dissipation by >98% compared to standard operation. The feature is detailed in the "Overvoltage Protection and the Smart Discharge Feature" section of SLUS236B.
What package type and pin count does UCC3957MTR-1 use?
UCC3957MTR-1 uses a 16-pin SSOP (Shrink Small Outline Package) with DBQ drawing code, 0.64 mm lead pitch, and tape-and-reel packaging (2500 units per reel). It is RoHS-compliant and classified as Green (Pb-free, no Sb/Br), with Moisture Sensitivity Level 2 (260°C peak reflow). This package matches the UCC3957M–1 series and is verified in TI's Packaging Information and Tape and Reel Addendum documents dated July 2009.
Can UCC3957MTR-1 support both three-cell and four-cell battery configurations?
Yes, UCC3957MTR-1 supports both configurations via the CLCNT pin (Pin 2). Tying CLCNT to DVDD or AVDD selects three-cell operation; tying it to AN4 (ground) selects four-cell operation. The pin is internally pulled low, so an open circuit defaults to four-cell mode. This hardware-selectable flexibility eliminates firmware or external logic requirements and is explicitly defined in the "Terminal Functions" and "Choosing Three or Four Cells" sections of SLUS236B.
What is the typical supply current for UCC3957MTR-1 in sleep mode?
The typical supply current for UCC3957MTR-1 in sleep mode is 3.5 µA, measured at VDD = 10.4 V and TA = –20°C to 70°C. Maximum specified sleep current is 7.5 µA. This ultra-low quiescent draw enables extended storage life and reliable wake-up from deep discharge states. The value is documented in the "Electrical Characteristics" table under "ISL Sleep-mode supply current" in SLUS236B Rev. September 2002.
UCC3957MTR-1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Battery Protection
- Battery Chemistry:
- Lithium Ion
- Number of Cells:
- 3 ~ 4
- Fault Protection:
- Over Current, Over/Under Voltage
- Interface:
- -
- Operating Temperature:
- -20°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
UCC3957MTR-1 FAQ
1.How can I place an order for UCC3957MTR-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for UCC3957MTR-1 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 UCC3957MTR-1 reliable?
The price and inventory of UCC3957MTR-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC3957MTR-1 is usually 5 days.
3.What payment methods are accepted for UCC3957MTR-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCC3957MTR-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCC3957MTR-1?
UCC3957MTR-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCC3957MTR-1 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 UCC3957MTR-1?
For technical support, including UCC3957MTR-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC3957MTR-1 requirements.
6.How does Aetrix verify that UCC3957MTR-1 is sourced from the original manufacturer or authorized distributors?
All UCC3957MTR-1 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 UCC3957MTR-1 meets industry standards.
7.What is the process for return or replacement of UCC3957MTR-1?
All UCC3957MTR-1 units undergo pre-shipment inspection (PSI). If there is an issue with UCC3957MTR-1, 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 UCC3957MTR-1 part is unused and in its original packaging.
Return procedure for UCC3957MTR-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
UCC3957MTR-1 Tags
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BQ29700DSER
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S-8241ABKMC-GBKT2G
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S-8252AAL-M6T1U
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