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Texas Instruments BQ77PL157APWR-4225
- Part No.:
- BQ77PL157APWR-4225
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ77PL157APWR-4225.pdf
- Description:
- IC BATT PROT LI-ION 3-6C 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,705
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Product details
Overview
BQ77PL157APWR-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 threshold, ±20 mV accuracy (0°C to 50°C), 2–2.5 µA normal-mode supply current, and low-side NMOS FET gate drive output. It enables primary-level voltage protection in power tools and e-bikes.
For engineers reviewing the BQ77PL157APWR-4225 datasheet, BQ77PL157APWR-4225 pinout, BQ77PL157APWR-4225 application, or BQ77PL157APWR-4225 equivalent, key selection criteria include fixed 4.225 V OV threshold, programmable delay via external CD capacitor, stackable level-shift architecture for up to 18-series monitoring, and recoverable fault option with hysteresis of 150–450 mV.
Technical Context
The BQ77PL157APWR-4225 implements precision cell voltage comparison against an internal reference, with independent VC1–VC6 inputs for direct per-cell sensing. Its overvoltage detection circuit triggers only when any single cell exceeds 4.225 V, initiating a CD-pin-based RC delay timer before asserting OUT and LVO outputs.
Stacking is enabled via LVIN/LVO level-shifting: upper-device LVO drives lower-device LVIN, reducing inter-device delay to ~132 ms (vs. 1–2 s for direct cell-triggered faults). The device supports both permanent latch and recoverable fault modes, with dedicated PCKP/PCKN pins supplying isolated gate drive power to low-side NMOS FETs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Overvoltage Threshold | Fixed 4.225 V - eliminates external resistor network and calibration; ensures consistent cell protection across production batches. |
| OV Accuracy | ±20 mV max (0°C to 50°C) - enables tight voltage margin control without derating for temperature drift in industrial environments. |
| Supply Current | 2–2.5 µA typical in normal mode - minimizes parasitic drain on battery packs during standby, extending shelf life. |
| Delay Time Control | Programmable via external CD capacitor (e.g., 0.22 µF yields 1–2 s delay) - allows tuning of fault response time to match system safety requirements. |
| Output Drive | Low-side NMOS gate driver (OUT pin) - directly controls external N-channel MOSFET in battery pack's discharge path without level-shifting circuitry. |
| Stacking Support | LVO/LVIN interface enables up to three devices (18-series total) with no isolation components - reduces BOM count and layout complexity vs. discrete solutions. |
| Hysteresis | 150–450 mV - prevents oscillation near trip point during marginal overvoltage conditions, ensuring stable fault recovery. |
Pinout & Package
The BQ77PL157APWR-4225 is housed in a 16-pin TSSOP (PW) package, 4.4 mm × 5.0 mm, 1.2 mm max height, RoHS-compliant, moisture sensitivity level 2 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LVO | Level-shift output | Drives LVIN of next-lower device in stacked configuration; enables cascaded fault propagation without external level shifters. |
| VC1–VC6 | Cell voltage sense inputs | Direct connection to each cell's positive terminal (VC1 = most positive); unused pins must tie to highest connected VCx to prevent false trips. |
| LVIN | Level-shift input | Receives LVO signal from upper device; initiates fast (~132 ms) fault response in stacked systems. |
| CD | Capacitor delay timer | External capacitor to GND sets overvoltage detection delay; voltage ramp from 0 V to 1.2 V triggers OUT/LVO activation. |
| OUT | Protection output | Open-drain NMOS gate driver referenced to PCKN; sinks current to turn on low-side protection FET in battery discharge path. |
| PCKP / PCKN | Output driver supply | PCKP connects to most-positive cell input of device; PCKN connects to FET source (or GND in upper-stack devices) - isolates gate drive from main stack voltage. |
| GND | Reference ground | System ground and negative end of cell stack; serves as return for all internal comparators and CD capacitor discharge path. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 4.225 V OV threshold | Eliminates external resistor divider and associated tolerance/temperature drift, simplifying design validation and reducing component count. |
| Stackable architecture (up to 18-series) | Enables scalable protection for high-voltage battery packs using identical ICs - no custom firmware or variant selection required. |
| Recoverable fault option | Supports automatic reset when all cells fall below VPROTECT – VTH (150–450 mV hysteresis), enabling self-clearing protection in transient overvoltage events. |
| Protected output, power, and ground pins | Withstands absolute maximum ratings up to 35 V on VCn, OUT, LVO, and CD - enhances robustness against voltage transients and miswiring. |
| Low-power operation (2–2.5 µA) | Reduces quiescent current draw on battery packs during storage or idle, critical for long-term reliability in medical and industrial applications. |
Applications
| Power Tools | UPS Systems |
|---|---|
Use Scenario: Cordless drill battery packs with 4–6 Li-ion cells subjected to rapid charge/discharge cycles and mechanical shock. IC Role / Device Role / Timing Role: Primary overvoltage protector that monitors individual cell voltages and disables discharge path via low-side FET within 1–2 seconds of overvoltage detection. Use Value: Prevents thermal runaway by halting charging before cell voltage exceeds 4.225 V, leveraging ±20 mV accuracy to avoid premature shutdown during normal voltage ripple. | Use Scenario: Rack-mounted UPS modules requiring redundant, stackable protection for 12–18 series Li-ion cells in backup power systems. IC Role / Device Role / Timing Role: Cascaded overvoltage monitor where upper-device LVO triggers lower-device LVIN, enabling coordinated shutdown across full string without inter-device isolation. Use Value: Achieves 18-series coverage with three identical BQ77PL157APWR-4225 devices - eliminates need for custom ASICs or complex level-shifting networks. |
| E-Bikes & Scooters | Medical Battery Packs |
Use Scenario: 36 V–48 V e-bike battery packs with 10–13 series cells operating in wide ambient temperatures (–20°C to 65°C). IC Role / Device Role / Timing Role: Secondary-level protection layer that backs up BMS microcontroller decisions, asserting hardware-based cutoff if software fails or communication drops. Use Value: Provides fail-safe shutdown independent of host processor; 2–2.5 µA quiescent current extends pack shelf life during seasonal storage. | Use Scenario: Portable diagnostic equipment with sealed 6-series Li-ion battery packs requiring certified, predictable protection behavior under IEC 62368-1. IC Role / Device Role / Timing Role: Fixed-threshold overvoltage detector with recoverable fault mode, allowing safe auto-recovery after brief overvoltage events (e.g., charger overshoot). Use Value: Meets medical safety standards via deterministic timing (1–2 s delay), ±20 mV accuracy at 0°C–50°C, and permanent latch option for critical fault escalation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ77PL900DR | Programmable OV threshold (3.75–4.35 V in 25-mV steps); same 16-pin TSSOP package and stacking capability. | Requires external resistor network for threshold setting; lacks fixed 4.225 V factory-trimmed accuracy. | Select when multi-voltage platform support (e.g., 4.2 V and 4.35 V cells) is needed; BQ77PL157APWR-4225 preferred for cost-sensitive, single-threshold designs. |
| BD49K33GUL | Single-cell overvoltage detector (max 4.33 V), SOT-23-5 package, no stacking or multi-cell sensing. | Only monitors one cell; requires six separate ICs and external logic to emulate 6-series protection. | Use only for ultra-low-cost, space-constrained single-cell applications; not a functional substitute for BQ77PL157APWR-4225 in multi-cell stacks. |
Compared with BQ77PL900DR, the BQ77PL157APWR-4225 trades programmability for tighter accuracy and lower BOM cost; compared with BD49K33GUL, it delivers integrated 6-cell monitoring and stacking in one device - eliminating discrete coordination logic and reducing PCB area by >70%.
Availability
BQ77PL157APWR-4225 is available at Aetrix Electronics and suitable for power tools, UPS systems, and e-bike battery packs requiring stable component supply, long-lifecycle assurance, and automotive-grade reliability screening.
Supply support for BQ77PL157APWR-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 specializing in analog, embedded processing, and power management technologies, with decades of experience in battery management and industrial-grade IC design.
The BQ77PL157APWR-4225 belongs to TI's bq77PL family of stackable Li-ion protection ICs, engineered specifically for high-reliability, hardware-based overvoltage safety in multi-cell battery packs used in mobility and industrial equipment.
FAQ
What is the overvoltage detection threshold of the BQ77PL157APWR-4225?
The BQ77PL157APWR-4225 has a fixed overvoltage detection threshold of 4.225 V, factory-trimmed and specified with ±20 mV maximum error over 0°C to 50°C. This value is non-adjustable and does not require external resistors, ensuring consistent performance across units and simplifying compliance testing for battery pack certifications.
How does the BQ77PL157APWR-4225 support battery stacks larger than six cells?
The BQ77PL157APWR-4225 supports up to 18-series cell stacks via its LVO and LVIN pins: the LVO output of one device connects to the LVIN input of the next lower device, propagating faults with minimal added delay (~132 ms per stage). No external level shifters or isolation components are required, and all devices use identical part numbers.
Does the BQ77PL157APWR-4225 offer recoverable or latched fault behavior?
The BQ77PL157APWR-4225 supports both recoverable and permanent fault modes. In recoverable mode, the device automatically resets OUT and LVO after all cell voltages fall below VPROTECT – VTH (150–450 mV hysteresis) for the programmed CD-capacitor discharge time. The specific mode is configured at manufacturing - BQ77PL157APWR-4225 uses the recoverable variant.
What package type and dimensions does the BQ77PL157APWR-4225 use?
The BQ77PL157APWR-4225 is supplied in a 16-pin TSSOP (PW) package measuring 4.4 mm × 5.0 mm with 0.65 mm pitch and 1.2 mm maximum height. It is RoHS-compliant, rated MSL-2 (260°C peak reflow), and shipped in 2000-unit tape-and-reel format - compatible with standard SMT assembly lines.
Can the BQ77PL157APWR-4225 drive high-side or low-side MOSFETs?
The BQ77PL157APWR-4225 is designed exclusively for low-side NMOS FET drive via its OUT pin, which is an open-drain output referenced to PCKN. It cannot directly drive high-side FETs; TI documentation explicitly states that alternate output options (e.g., high-side fuse or FET) require contacting TI for custom variants - the BQ77PL157APWR-4225 does not support them.
BQ77PL157APWR-4225 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
BQ77PL157APWR-4225 FAQ
1.How can I place an order for BQ77PL157APWR-4225 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ77PL157APWR-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 BQ77PL157APWR-4225 reliable?
The price and inventory of BQ77PL157APWR-4225 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ77PL157APWR-4225 is usually 5 days.
3.What payment methods are accepted for BQ77PL157APWR-4225?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ77PL157APWR-4225 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ77PL157APWR-4225?
BQ77PL157APWR-4225 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ77PL157APWR-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 BQ77PL157APWR-4225?
For technical support, including BQ77PL157APWR-4225 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ77PL157APWR-4225 requirements.
6.How does Aetrix verify that BQ77PL157APWR-4225 is sourced from the original manufacturer or authorized distributors?
All BQ77PL157APWR-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 BQ77PL157APWR-4225 meets industry standards.
7.What is the process for return or replacement of BQ77PL157APWR-4225?
All BQ77PL157APWR-4225 units undergo pre-shipment inspection (PSI). If there is an issue with BQ77PL157APWR-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 BQ77PL157APWR-4225 part is unused and in its original packaging.
Return procedure for BQ77PL157APWR-4225:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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