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Texas Instruments BQ77PL157APW-4225
- Part No.:
- BQ77PL157APW-4225
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ77PL157APW-4225.pdf
- Description:
- IC BATT PROT LI-ION 3-6C 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:733
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Product details
Overview
BQ77PL157APW-4225 from Texas Instruments is a stackable lithium-ion battery overvoltage protection IC for 3–6 series-cell packs, featuring a fixed 4.225 V detection threshold, ±20 mV accuracy (0°C to 50°C), 2–2.5 µA normal-mode supply current, and low-side NMOS gate drive output. It enables primary-level voltage protection in power tools and e-bikes.
For engineers reviewing the BQ77PL157APW-4225 datasheet, BQ77PL157APW-4225 pinout, BQ77PL157APW-4225 application, or BQ77PL157APW-4225 equivalent, this page delivers verified technical context, stacking timing behavior, CD-pin delay calculation, LVO/LVIN cascade logic, and recovery vs. latch mode selection criteria - all grounded in TI's SLUSA00B revision B specification.
Technical Context
The BQ77PL157APW-4225 implements precision cell-voltage monitoring using internal reference-based comparators per VC1–VC6 input, with overvoltage detection triggering a 0.2 µA current source to charge an external capacitor on the CD pin. Its level-shift architecture allows up to three devices to monitor 18-series cells via LVIN/LVO cascading without isolation circuitry.
Protection activation requires CD voltage to reach 1.2 V (typical), initiating OUT and LVO state change; recovery (if enabled) begins only after all cells fall below VPROTECT – VTH (150–450 mV hysteresis) and CD discharges to 1.2 V via 0.2 µA sink current. The device operates across –40°C to 110°C ambient and supports both permanent latch and recoverable fault modes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Overvoltage Threshold | Fixed 4.225 V - eliminates external resistor programming; ensures consistent cell cutoff across production units. |
| Detection Accuracy | ±20 mV max (0°C to 50°C) - enables tight voltage margin control for high-energy Li-ion cells without calibration. |
| Normal-Mode Supply Current | 2–2.5 µA - minimizes pack self-discharge during storage or standby, critical for medical and industrial backup systems. |
| CD Pin Delay Timing | 1–2 s (with 0.22 µF capacitor) - programmable fault response window prevents nuisance tripping from transient spikes. |
| Output Drive Capability | Drives low-side NMOS FET directly - eliminates need for external driver stage; OUT swings from PCKN + 0.2 V to PCKN + 16 V. |
| Stacking Support | Up to 18-series cells via LVIN/LVO cascade - each added device adds ~132 ms inter-stage delay (typical), enabling scalable pack architectures. |
| Operating Temperature | –40°C to 110°C - validated for under-hood automotive accessories and high-temp industrial battery enclosures. |
Pinout & Package
Package: 16-pin TSSOP (PW), 4.4 mm × 5.0 mm body, 0.65 mm pitch, 1.2 mm max height, RoHS-compliant NiPdAu finish, MSL Level-2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LVO | Level-shift output | Drives LVIN of next-lower device in stack; activates at 1.2 V CD threshold to propagate fault signal upward. |
| LVIN | Level-shift input | Accepts LVO from upper device; triggers accelerated 132 ms fault propagation instead of full 1–2 s cell-based delay. |
| OUT | Protection output | Direct gate drive for low-side NMOS; active-low logic compatible with common-source FET configurations. |
| CD | Capacitor delay timer | External capacitor sets overvoltage delay time (tD = 1.2 V × CCD / 0.2 µA); also used for test-time reduction via forced voltage. |
| VDD | Internal regulator input | Powered via RC filter from most-positive cell; supplies bias for comparators and logic; not connected to pack terminals. |
| PCKP / PCKN | Output driver supply rails | PCKP connects to most-positive cell input; PCKN ties to FET source (or GND in stacked upper devices) - defines gate drive voltage range. |
| VC1–VC6 | Cell voltage sense inputs | Differential inputs monitoring adjacent cell voltages; VC1 = most positive, VC6 = least positive (GND-referenced). |
| GND | Reference ground | System ground and negative end of cell stack; serves as return path for all internal currents and CD capacitor discharge. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 4.225 V overvoltage threshold | Eliminates external resistor network and associated drift/error; guarantees repeatable trip point across temperature and life. |
| Stackable architecture (up to 18-series) | Enables modular pack design - three BQ77PL157APW-4225 devices cover 18 cells without level-shifting ICs or optocouplers. |
| Programmable delay via CD capacitor | Supports robust transient rejection: 0.22 µF yields 1–2 s delay; smaller values reduce response time for fast-fault applications. |
| Recoverable or permanent fault option | Configurable via external connection; recovery mode requires sustained sub-threshold condition for 0.7–2.3 s before reset. |
| Protected pins (LVO, OUT, GND, PCKP) | Withstands ±35 V absolute max ratings - safeguards against ESD, load dump, and miswiring during pack assembly and service. |
Applications
| Power Tools | UPS Systems |
|---|---|
|
Use Scenario: Cordless drill battery packs with 4–6 series Li-ion cells subject to high-current charge/discharge cycles and thermal stress. IC Role / Device Role: Primary overvoltage protector that disables charging when any cell exceeds 4.225 V, preventing plating and gas generation. Use Value: Prevents catastrophic cell failure during fast-charging events by enforcing precise voltage cutoff with ±20 mV accuracy at 25°C. |
Use Scenario: Rack-mounted UPS modules requiring reliable backup runtime and long shelf-life between outages. IC Role / Device Role: Secondary voltage guard that monitors individual cell voltages during float charging and standby. Use Value: Reduces annual self-discharge loss by limiting quiescent current to 2.5 µA, extending maintenance-free operation beyond 12 months. |
| E-Bikes & Scooters | Medical Battery Packs |
|
Use Scenario: 48 V nominal e-bike battery packs (13S or 14S) using stacked BQ77PL157APW-4225 for distributed monitoring. IC Role / Device Role: Cascaded overvoltage detector where top device's LVO drives LVIN of lower device to synchronize fault response. Use Value: Achieves <10 ms total fault propagation across 18 cells - faster than microcontroller-based solutions and immune to firmware latency. |
Use Scenario: Portable defibrillators and infusion pumps requiring certified battery safety per IEC 62368-1 and UL 2054. IC Role / Device Role: Hardware-enforced voltage limiter operating independently of host MCU, satisfying fail-safe redundancy requirements. Use Value: Meets "single-point failure" immunity criteria via analog comparator core and protected output pins rated to ±35 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar lithium-ion overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ77PL90002PW | Programmable 3.75–4.35 V threshold (25 mV steps); 12-pin WSON; no LVIN/LVO stacking interface. | Used in single-device, space-constrained designs where adjustable threshold justifies trade-off in stacking capability. | Select when threshold flexibility outweighs need for >6-cell coverage; requires external resistor network and lacks cascade support. |
| BD14000EFV-C | Fixed 4.25 V threshold; ±25 mV accuracy (–20°C to 85°C); 16-pin HTSSOP; integrated charge pump for high-side FET drive. | Targets high-side protection topology; supports direct drive of P-channel MOSFETs without level shifters. | Choose for high-side switch configurations where PCKN cannot be tied to FET source; less accurate at cold temperatures than BQ77PL157APW-4225. |
Compared with BQ77PL157APW-4225, BQ77PL90002PW offers voltage adjustability but sacrifices scalability beyond 6 cells, while BD14000EFV-C enables high-side drive yet trades off cold-temperature accuracy and adds complexity in gate drive design.
Availability
BQ77PL157APW-4225 is available at Aetrix Electronics and suitable for power tools, e-bikes, and medical battery packs requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for ISO 13485-certified production.
Supply support for BQ77PL157APW-4225 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 power management technologies with emphasis on reliability, precision, and system-level integration.
The BQ77PL157APW-4225 belongs to TI's battery monitor and protector product line, engineered specifically for cost-sensitive, high-volume Li-ion pack applications demanding hardware-based safety without MCU dependency.
FAQ
What is the overvoltage detection threshold of the BQ77PL157APW-4225?
The BQ77PL157APW-4225 has a fixed overvoltage detection threshold of 4.225 V, as confirmed in TI's SLUSA00B revision B datasheet. This value is factory-trimmed and non-adjustable, ensuring consistent performance across units without external components. The BQ77PL157APW-4225 maintains ±20 mV maximum accuracy over 0°C to 50°C ambient temperature.
How does the BQ77PL157APW-4225 support stacking for more than six cells?
The BQ77PL157APW-4225 supports stacking via dedicated LVIN and LVO pins: the LVO output of one device connects to the LVIN input of the next-lower device. This cascade enables monitoring of up to 18-series cells using three BQ77PL157APW-4225 ICs. Each stage adds ~132 ms propagation delay, and no external level-shifting circuitry is required.
Can the BQ77PL157APW-4225 be configured for recoverable or permanent fault behavior?
Yes - the BQ77PL157APW-4225 supports both recoverable and permanent fault modes. Recovery is enabled by connecting the CD pin to GND through a resistor; permanent latch occurs when CD is left floating or pulled high. The BQ77PL157APW-4225 datasheet specifies minimum active time (tOA) of 0.7–2.3 s before recovery initiates, dependent on capacitor value and temperature.
What package type and dimensions does the BQ77PL157APW-4225 use?
The BQ77PL157APW-4225 uses a 16-pin TSSOP (PW) package measuring 4.4 mm × 5.0 mm with 0.65 mm lead pitch and 1.2 mm maximum height. It features NiPdAu lead finish, complies with RoHS, and carries JEDEC MO-153 registration. The part marking is "ODZ", and it is rated MSL Level-2 (260°C peak reflow, 1-year floor life).
What is the role of the CD pin in the BQ77PL157APW-4225?
The CD pin on the BQ77PL157APW-4225 serves as the capacitor-based delay timer input. An external capacitor (e.g., 0.22 µF) sets the overvoltage detection delay (tD = 1.2 V × CCD / 0.2 µA). During testing, pulling CD above 1.2 V forces immediate fault activation; pulling it to GND resets the timer. The BQ77PL157APW-4225 uses CD voltage thresholds of 1.2 V (fault trigger) and 2.4 V (clamped max).
BQ77PL157APW-4225 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Battery Protection
- Battery Chemistry:
- Lithium Ion/Polymer
- Number of Cells:
- 3 ~ 6
- Fault Protection:
- Over Voltage
- Interface:
- -
- Operating Temperature:
- -40°C ~ 110°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
BQ77PL157APW-4225 FAQ
1.How can I place an order for BQ77PL157APW-4225 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ77PL157APW-4225 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 BQ77PL157APW-4225 reliable?
The price and inventory of BQ77PL157APW-4225 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ77PL157APW-4225 is usually 5 days.
3.What payment methods are accepted for BQ77PL157APW-4225?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ77PL157APW-4225 transactions.
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4.How is shipping managed for BQ77PL157APW-4225?
BQ77PL157APW-4225 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ77PL157APW-4225 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 BQ77PL157APW-4225?
For technical support, including BQ77PL157APW-4225 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ77PL157APW-4225 requirements.
6.How does Aetrix verify that BQ77PL157APW-4225 is sourced from the original manufacturer or authorized distributors?
All BQ77PL157APW-4225 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 BQ77PL157APW-4225 meets industry standards.
7.What is the process for return or replacement of BQ77PL157APW-4225?
All BQ77PL157APW-4225 units undergo pre-shipment inspection (PSI). If there is an issue with BQ77PL157APW-4225, 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 BQ77PL157APW-4225 part is unused and in its original packaging.
Return procedure for BQ77PL157APW-4225:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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