My Inquiry
My Account
Texas Instruments BQ7790500PWR
- Part No.:
- BQ7790500PWR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ7790500PWR.pdf
- Description:
- IC BATT PROT LI-ION 3-5C 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,371
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BQ7790500PWR from Texas Instruments is a 3- to 5-series ultra-low-power lithium-ion battery protector IC implementing integrated voltage, current, temperature, and open-wire protection without MCU control. It features ±10 mV overvoltage/undervoltage accuracy, 6 µA normal-mode quiescent current, and factory-programmed thresholds including OV = 4.200 V (0.5 s delay), UV = 2.600 V (1 s delay), OTD = 70°C, UTC = 0°C - deployed in power tools, light EVs, and 10.8–72-V energy storage packs.
For engineers reviewing the BQ7790500PWR datasheet, BQ7790500PWR pinout, BQ7790500PWR application, or BQ7790500PWR equivalent, key selection criteria include its stackable TSSOP-20 architecture, independent CHG/DSG low-side NMOS drivers, 36-V absolute max cell-input rating, built-in self-test capability, and functional safety documentation support for ISO 26262-compliant battery systems.
Technical Context
The BQ7790500PWR implements autonomous analog protection logic with no firmware or external controller required. Its core architecture includes five cell-voltage sense inputs (VC1–VC5), dual current-sense comparators (SRP/SRN), thermistor-based temperature monitoring via TS/VTB, and cascaded CHG/DSG control signaling through CTRC/CTRD pins for multi-device stacks.
Protection decisions are made using factory-trimmed thresholds and fixed internal delay timers - e.g., OV detection uses a 0.5-s delay, UV uses 1 s, and OCD2 triggers at –50 mV with 700-ms delay. All fault responses drive independent CHG and DSG FET outputs, with optional external override via CTRC/CTRD to enable hierarchical control in ≥6-series configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Cell Count Support | 3-series to 5-series Li-ion packs; scalable to ≥20-series via stacking |
| Normal Mode Current | 6 µA - enables multi-year battery pack shelf life and ultra-low standby drain |
| Overvoltage Threshold | 4.200 V ±10 mV (0.5 s delay) - matches common NMC cell full-charge voltage with tight tolerance |
| Undervoltage Threshold | 2.600 V ±18 mV (1 s delay) - prevents deep discharge damage to Li-ion cells |
| OCD2 Detection | –50 mV threshold (700 ms delay) - detects moderate overcurrent before thermal runaway onset |
| Temperature Protection | OTD = 70°C, UTC = 0°C - provides asymmetric charge/discharge thermal cutoffs per JEITA guidelines |
| Package | TSSOP-20 (6.5 mm × 4.4 mm) - surface-mount compatible with automated PCB assembly |
Pinout & Package
TSSOP-20 package (6.50 mm × 4.40 mm body size) with exposed thermal pad; RoHS-compliant, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | 3–25 V main supply; powers internal regulators and logic |
| VC1–VC5 | Cell voltage sense inputs | Differential sensing of up to five series-connected Li-ion cells (VC5 must connect to VC4 on BQ77904 only) |
| SRP / SRN | Current sense differential inputs | Monitor voltage drop across external sense resistor to detect discharge overcurrent and short circuit |
| CHG / DSG | Low-side NMOS FET drivers | Active-high outputs controlling charge and discharge FETs; 1 mA drive capability, 12 V typical on-state |
| CTRC / CTRD | Cascade control inputs | Accept CHGU/DSGU signals from upper device in stacked configuration to synchronize protection actions |
| TS / VTB | Thermistor interface | TS measures NTC voltage; VTB supplies 3.0 V bias - enables precise temperature thresholds using 10-kΩ/103AT network |
| LD | Load removal detection input | Monitors PACK– node to disable protections during load disconnect and prevent false fault latching |
Key Features
| Feature | Design Value |
|---|---|
| Stackable architecture | Enables single-IC protection for 3–5S packs or cascaded operation supporting ≥20S with no communication bus |
| Independent CHG/DSG drivers | Allows separate control of charge and discharge paths - critical for safe Li-ion balancing and recovery sequencing |
| Open-wire detection | Identifies broken interconnects between cells using 500 mV ±50 mV threshold - prevents undetected cell isolation |
| Built-in self-test (BIST) | Verifies internal comparators, reference, and timing circuits at power-up - improves ASIL-B system reliability |
| Functional safety documentation | Includes FIT rate, failure mode analysis, and diagnostic coverage data to accelerate ISO 26262 hardware assessment |
Applications
| Power Tools | Light Electric Vehicles |
|---|---|
|
Use Scenario: Cordless drill/driver battery packs operating at 18–36 V with high pulse discharge currents (>30 A). IC Role / Device Role: Primary hardware-level protector enforcing cell voltage limits, overtemperature cutoff during motor stall, and short-circuit shutdown within 400 µs. Use Value: Prevents thermal runaway during abusive use while maintaining 6 µA quiescent draw to preserve shelf life between jobs. |
Use Scenario: 48-V e-bike or e-scooter battery modules requiring robust discharge protection under regenerative braking and hill-climb loads. IC Role / Device Role: Autonomous protector managing asymmetric OTD (70°C) and UTC (0°C) thresholds to extend cycle life in variable ambient conditions. Use Value: Eliminates need for microcontroller-based protection firmware, reducing BOM cost and certification effort for UL 2271 compliance. |
| Energy Storage Systems | Start-Stop Automotive Batteries |
|
Use Scenario: Residential 48-V LiFePO₄ backup systems with 10+ year field deployment and minimal maintenance access. IC Role / Device Role: Long-life protector using shutdown mode (0.5 µA) during grid-tied standby and fast OCD2 response (700 ms) during islanding events. Use Value: Ensures >15-year calendar life by minimizing self-discharge and enabling reliable open-wire fault detection across thermal cycling. |
Use Scenario: 12-V stop-start battery replacement packs using Li-ion instead of lead-acid, subject to engine cranking transients and wide temperature swings. IC Role / Device Role: Dual-threshold temperature protector with UTD = –20°C and UTC = 0°C - permits charging only above freezing to avoid lithium plating. Use Value: Enables safe cold-weather operation while meeting OEM requirements for <100-ppm field failure rates over 8-year service life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ7790502PWR | OV = 4.250 V (1 s delay), UV = 2.700 V (1 s delay), OCD2 = –120 mV (350 ms delay), UTC = –5°C | Better suited for higher-voltage NMC cells and colder-temperature charging environments | Select when tighter UV hysteresis (200 mV) and lower UTC threshold are required for arctic-grade operation |
| BQ7790503PWR | OV = 4.200 V (1 s delay), UV = 2.700 V (2 s delay), OCD2 = –160 mV (350 ms delay), UTC = –5°C | Offers longer UV delay for transient recovery in high-impedance packs and enhanced short-circuit immunity | Prefer for applications with frequent voltage sags (e.g., power tool startup) where false UV trips must be minimized |
Compared with BQ7790500PWR, BQ7790502PWR provides higher OV tolerance and colder UTC, while BQ7790503PWR adds UV delay headroom and stronger OCD2 sensitivity - all share identical TSSOP-20 footprint and cascade interface, enabling layout reuse across variants.
Availability
BQ7790500PWR is available at Aetrix Electronics and suitable for power tools, light electric vehicles, and energy storage systems requiring stable component supply, long-term lifecycle support, and automotive-grade reliability validation.
Supply support for BQ7790500PWR 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 over 50 years of innovation in battery management solutions.
The BQ77905 product line delivers autonomous, stackable protection for multi-cell Li-ion packs - designed specifically for cost-sensitive, high-reliability applications where MCU-free operation and functional safety readiness are mandatory.
FAQ
What is the maximum number of series cells supported by BQ7790500PWR?
BQ7790500PWR natively supports 3- to 5-series Li-ion configurations. When stacked with up to three additional BQ77905 devices using the CTRC/CTRD cascade interface, it scales to protect battery packs with 20 or more series cells - all without external microcontroller intervention or communication protocol overhead.
Does BQ7790500PWR require external components for basic operation?
Yes, BQ7790500PWR requires external components for full functionality: a 0.1-µF capacitor on AVDD, 1-µF capacitor on VDD, 10-kΩ resistor between VTB and TS for thermistor biasing, and a precision current-sense resistor between SRP/SRN. No external MCU or programming interface is needed - all protection logic is self-contained.
How does BQ7790500PWR handle open-wire faults?
BQ7790500PWR detects open-wire faults by monitoring voltage differentials between adjacent cell sense pins (e.g., VC2–VC1). It triggers at 500 mV ±50 mV with 4.5-s delay and asserts CHG/DSG shutdown. The fault remains latched until load removal is detected on LD pin or VDD cycle - preventing unsafe re-engagement after wiring failure.
What is the purpose of the CTRC and CTRD pins on BQ7790500PWR?
CTRC and CTRD pins on BQ7790500PWR accept CHGU and DSGU signals from an upper-stack device to synchronize protection actions across multiple ICs. In a 6S+ configuration, the top device drives CTRC/CTRD of the device below it - enabling coordinated CHG/DSG FET control without shared bus or timing skew.
Is BQ7790500PWR qualified for automotive applications?
BQ7790500PWR is not AEC-Q200 qualified, but it supports functional safety development for automotive-grade systems: TI provides FIT rate data, failure mode analysis, and diagnostic coverage reports aligned with ISO 26262 ASIL-B requirements - enabling integration into start-stop battery modules and L1/L2 ADAS auxiliary power systems.
BQ7790500PWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Battery Protection
- Battery Chemistry:
- Lithium Ion
- Number of Cells:
- 3 ~ 5
- Fault Protection:
- Over Current, Over Temperature, Over/Under Voltage, Short Circuit
- Interface:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
BQ7790500PWR FAQ
1.How can I place an order for BQ7790500PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ7790500PWR 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 BQ7790500PWR reliable?
The price and inventory of BQ7790500PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ7790500PWR is usually 5 days.
3.What payment methods are accepted for BQ7790500PWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ7790500PWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ7790500PWR?
BQ7790500PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ7790500PWR 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 BQ7790500PWR?
For technical support, including BQ7790500PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ7790500PWR requirements.
6.How does Aetrix verify that BQ7790500PWR is sourced from the original manufacturer or authorized distributors?
All BQ7790500PWR 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 BQ7790500PWR meets industry standards.
7.What is the process for return or replacement of BQ7790500PWR?
All BQ7790500PWR units undergo pre-shipment inspection (PSI). If there is an issue with BQ7790500PWR, 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 BQ7790500PWR part is unused and in its original packaging.
Return procedure for BQ7790500PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BQ7790500PWR Tags
-
BQ29700DSER
Texas Instruments
-
S-8241ABKMC-GBKT2G
ABLIC Inc.
-
S-8241ABPMC-GBPT2G
ABLIC Inc.
-
BQ27427YZFR
Texas Instruments
-
BQ27426YZFR
Texas Instruments
-
STC3117IJT
STMicroelectronics
-
STC3115IJT
STMicroelectronics
-
BQ76925RGER
Texas Instruments
-
NPM1100-QDAA-R
Nordic Semiconductor ASA
-
BQ27441DRZR-G1A
Texas Instruments
-
STC3115AIQT
STMicroelectronics
-
S-8252AAL-M6T1U
ABLIC Inc.
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
