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Texas Instruments BQ24155RGYT
- Part No.:
- BQ24155RGYT
- Manufacturer:
- Texas Instruments
- Category:
- Battery Chargers
- Package:
- 14-VFQFN Exposed Pad
- Datasheet:
-
BQ24155RGYT.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 14VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,430
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Product details
Overview
BQ24155RGYT from Texas Instruments is a fully integrated, I²C-programmable, synchronous switch-mode Li-ion/Li-polymer battery charger for single-cell portable devices. It delivers up to 1.25 A charge current, supports USB-compliant input current limiting (100 mA/500 mA), regulates charge voltage from 3.5 V to 4.44 V with ±0.5% accuracy at 25°C, and operates in a 3.5 mm × 3.5 mm 14-pin QFN package. It enables fast charging in smartphones and MP3 players while maintaining thermal regulation and input overvoltage protection.
For engineers reviewing the BQ24155RGYT datasheet, BQ24155RGYT pinout, BQ24155RGYT application, or BQ24155RGYT equivalent, key selection considerations include its 3 MHz fixed-frequency PWM controller, programmable safety timer (32-minute/32-second modes), integrated power FETs, I²C-compatible interface (up to 3.4 Mbps), and automatic high-impedance mode for low-power standby operation.
Technical Context
The BQ24155RGYT implements a voltage-mode synchronous PWM controller operating at 3 MHz with 0%–99.5% duty cycle control, using internal Type-III compensation for stable regulation across continuous and discontinuous conduction modes. It integrates back-to-back N-channel FETs on the high side (Q1 reverse-blocking, Q2 switching) and one low-side N-FET (Q3), with bootstrap gate drive for Q2 and charge-pump drive for Q1.
Four concurrent regulation loops-input current, charge current, charge voltage, and junction temperature (125°C thermal regulation threshold)-dynamically prioritize control during charging. Charge termination is based on programmable minimum current level (50–400 mA), and automatic recharge triggers when battery voltage falls below V(OREG) – V(RCH) (100–150 mV hysteresis).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Voltage Range | 3.5 V to 4.44 V, programmable via I²C; enables compatibility with diverse Li-ion chemistries and system voltage rails. |
| Max Charge Current | 1.25 A, delivered via integrated synchronous FETs; eliminates need for external power switches in space-constrained designs. |
| Input Current Limit | 100 mA or 500 mA, selectable via ISEL pin or I²C; ensures full USB 2.0 compliance and prevents host port overload. |
| Regulation Accuracy | ±0.5% at 25°C for voltage, ±5% for current; guarantees precise state-of-charge estimation and battery longevity. |
| Oscillator Frequency | 3 MHz fixed, with ±10% tolerance; enables use of ultra-small external inductors and ceramic capacitors. |
| Safety Timer | Configurable 32-minute or 32-second mode with reset control; provides hardware-backed overcharge protection independent of host firmware. |
| Thermal Regulation | Active reduction of charge current above ~125°C junction temperature; maintains safe operation without external thermal sensors. |
| Package | 14-pin QFN (RGY), 3.5 mm × 3.5 mm, 0.5 mm pitch; supports high-density PCB layouts and automated assembly. |
Pinout & Package
Package: 14-pin QFN (RGY), 3.5 mm × 3.5 mm, exposed thermal pad connected internally to PGND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOT | Bootstrap capacitor connection | Provides gate drive voltage for high-side switching FET (Q2); requires 10 nF ceramic capacitor to SW pin. |
| CSIN / CSOUT | Battery current sense inputs | Differential sensing across external RSNS (e.g., 68 mΩ); enables accurate charge current monitoring and termination. |
| ISEL | Input current limit selection | Digital input: Low = 100 mA limit, High = 500 mA limit; fallback control when I²C interface is unavailable. |
| SCL / SDA | I²C interface signals | Open-drain, 3.4 Mbps compatible; require 10 kΩ pull-ups to 1.8 V; enable full parameter programming and status reporting. |
| STAT | Charge status output | Open-drain indicator: active-low during charge, 128 µs pulse during faults; supports LED or host interrupt signaling. |
| PMID | Power path output | Switched output between VBUS and battery; enables system power-up without battery and reverse leakage protection. |
| SW | Switch node | Connection to external inductor; carries high-frequency PWM current; must be routed with minimal loop area for EMI control. |
| PGND / SGND | Power and signal ground | PGND handles high-current return paths; SGND isolates sensitive analog circuits; both must connect to common ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| USB-friendly boot-up sequence | Automatically revives deeply discharged batteries (<3.4 V) using ISEL-selected current limit before host I²C initialization. |
| Automatic high-impedance mode | Reduces quiescent current to ≤35 mA when VBUS is removed; extends standby time in battery-powered systems. |
| Integrated power FETs | Eliminates 4 external MOSFETs and associated gate drivers; reduces BOM count and layout complexity in compact designs. |
| Robust protection suite | Includes input/output overvoltage (6.7 V / 121% VOREG), thermal shutdown (165°C), short-circuit detection (2.0 V battery threshold), and reverse leakage prevention. |
| Programmable recharge threshold | VRCH = 100–150 mV below VOREG; prevents premature recharging and optimizes cycle life in intermittent-use applications. |
| 32-second safety timer with reset | Host-controlled backup timer that resets on any I²C write; ensures charge termination even if firmware stalls or loses communication. |
Applications
| Smartphone Power Management | MP3 Player Charging System |
|---|---|
Use Scenario: Compact handheld device requiring fast, USB-compliant charging with minimal board area and thermal footprint. IC Role / Device Role / Timing Role: Primary battery charge manager handling CC/CV profile, input current regulation, and thermal management during active charging cycles. Use Value: Enables 1.25 A charging from 5 V USB supply while maintaining ±0.5% voltage accuracy and automatic 125°C thermal foldback-critical for user safety and battery health. | Use Scenario: Portable audio player with limited PCB space, needing reliable charging from PC USB ports or wall adapters. IC Role / Device Role / Timing Role: Single-chip solution managing battery conditioning, fast charge, voltage regulation, and charge termination via I²C host control. Use Value: Delivers full USB 2.0 compliance (100/500 mA limits), programmable 3.5–4.44 V charge voltage, and 32-minute safety timer-eliminating discrete timing components. |
| Handheld Medical Monitor | Industrial Handheld Scanner |
Use Scenario: Battery-powered clinical device requiring certified, repeatable charge performance and fault-safe operation. IC Role / Device Role / Timing Role: Safety-critical charge controller enforcing strict voltage/current tolerances, thermal regulation, and overvoltage protection per IEC 62368. Use Value: Provides ±1% voltage regulation from 0°C to 125°C, 165°C thermal shutdown, and input OVP (6.7 V) - meeting medical-grade reliability requirements without external supervision. | Use Scenario: Ruggedized barcode scanner used in warehouses with variable ambient temperatures and frequent charge cycles. IC Role / Device Role / Timing Role: Integrated charger supporting automatic recharge, weak-battery detection (3.4–3.7 V threshold), and high-impedance mode for long shelf-life. Use Value: Extends operational uptime via programmable VLOWV hysteresis and enables >20 mA battery discharge current in high-Z mode-preserving battery charge during storage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Li-ion single-cell charger applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ24157RGYT | Same pinout and register map; adds dynamic power path management (DPPM) and improved thermal regulation algorithm. | Required when system load must remain powered during charging from weak sources (e.g., low-current USB ports). | Select BQ24157RGYT if DPPM functionality is needed; otherwise BQ24155RGYT offers identical core charging performance at lower cost. |
| MAX1555ETA+ | Linear charger architecture; no inductor required; max 500 mA charge current; no I²C interface; fixed 4.2 V output. | Suitable only for low-power, cost-sensitive applications where efficiency and thermal constraints are less critical. | Choose MAX1555ETA+ only for ultra-low-BOM designs with <500 mA requirement and no need for programmability or high efficiency. |
Compared with BQ24157RGYT, the BQ24155RGYT lacks DPPM but matches in size, I²C control, and USB compliance; versus MAX1555ETA+, it delivers 2.5× higher charge current, 30% better efficiency, and full programmability-making it superior for performance-driven portable designs.
Availability
BQ24155RGYT is available at Aetrix Electronics and suitable for smartphone power management, MP3 player charging systems, handheld medical monitors, industrial handheld scanners, and portable instrumentation requiring stable component supply and long-term lifecycle support.
Supply support for BQ24155RGYT 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 charging ICs for portable electronics.
The BQ24155RGYT belongs to TI's bq2415x family of highly integrated Li-ion chargers designed specifically for space-constrained, USB-powered consumer devices requiring precision regulation, robust protection, and I²C configurability.
FAQ
What is the maximum charge current supported by the BQ24155RGYT?
The BQ24155RGYT supports a maximum programmable charge current of 1.25 A. This value is achieved using the integrated synchronous power FETs and is specified under recommended operating conditions (VBUS = 5 V, TJ ≤ 125°C). The actual delivered current depends on external components-including the sense resistor value (e.g., 68 mΩ for 1.25 A), inductor rating, and thermal design-and is regulated with ±5% accuracy across temperature.
Does the BQ24155RGYT require an external inductor, and what is its typical value?
Yes, the BQ24155RGYT requires an external power inductor as part of its synchronous buck converter topology. A typical value is 1.0 µH, rated for ≥1.5 A DC current and selected for low DCR to minimize conduction losses. Inductor selection must consider the 3 MHz switching frequency-high-frequency ferrite cores with tight coupling and low AC resistance are recommended to maintain efficiency and reduce EMI.
How does the BQ24155RGYT handle thermal regulation during charging?
The BQ24155RGYT monitors its junction temperature and begins reducing charge current when TJ reaches approximately 125°C. This thermal regulation is automatic and continuous-no external sensor or host intervention is required. The device remains operational but throttles current to prevent exceeding the 150°C absolute maximum junction temperature. Thermal performance is enhanced by the exposed thermal pad, which must be soldered to a PCB copper pour connected to PGND.
Can the BQ24155RGYT operate without a battery connected?
Yes, the BQ24155RGYT supports power-up of the system without a battery via the PMID pin. When VBUS is present and no battery is attached (or battery voltage is below VSHORT), the device can supply regulated power to the system load through PMID, provided AUXPWR is not connected or is at a safe voltage. This capability enables "battery-less" operation during development or field service, and is enabled by the integrated reverse-blocking FET (Q1) preventing backfeed.
What protection features are built into the BQ24155RGYT?
The BQ24155RGYT integrates multiple hardware-based protections: input overvoltage lockout (UVLO at 3.3 V, hysteresis 150 mV), input OVP (6.7 V), output OVP (121% of VOREG), thermal shutdown (165°C), short-circuit detection (2.0 V battery threshold), cycle-by-cycle current limiting (2.3 A peak), and reverse leakage prevention. All protections operate independently of I²C control and do not require host firmware-ensuring fail-safe behavior even during communication loss.
BQ24155RGYT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Battery Chemistry:
- Lithium Ion/Polymer
- Number of Cells:
- 1
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- Current, Timer, Voltage
- Fault Protection:
- Over Temperature, Over Voltage
- Charge Current - Max:
- 1.25A
- Battery Pack Voltage:
- 4.44V (Max)
- Voltage - Supply (Max):
- 6V
- Interface:
- I2C
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-VQFN (3.5x3.5)
BQ24155RGYT FAQ
1.How can I place an order for BQ24155RGYT through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ24155RGYT 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 BQ24155RGYT reliable?
The price and inventory of BQ24155RGYT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ24155RGYT is usually 5 days.
3.What payment methods are accepted for BQ24155RGYT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ24155RGYT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ24155RGYT?
BQ24155RGYT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ24155RGYT 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 BQ24155RGYT?
For technical support, including BQ24155RGYT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ24155RGYT requirements.
6.How does Aetrix verify that BQ24155RGYT is sourced from the original manufacturer or authorized distributors?
All BQ24155RGYT 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 BQ24155RGYT meets industry standards.
7.What is the process for return or replacement of BQ24155RGYT?
All BQ24155RGYT units undergo pre-shipment inspection (PSI). If there is an issue with BQ24155RGYT, 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 BQ24155RGYT part is unused and in its original packaging.
Return procedure for BQ24155RGYT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BQ24155RGYT Tags
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BQ21040DBVR
Texas Instruments
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