L6924U STMicroelectronics Integrated Circuit (Quad Flat No-Lead) In Stock
Single-cell linear Li-Ion battery charger IC in a compact 3×3 mm VFQFPN-16 package with integrated safety timers and charge status outputs. Provides constant-current and constant-voltage charging for Li-Ion and Li-Polymer cells. RoHS compliant, ideal for portable consumer electronics and wearable devices.
- Manufacturer
- STMicroelectronics
- Package
- Quad Flat No-Lead
- Pin Count
- 16
- Lifecycle
- ACTIVE
- Datasheet
- L6924U Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Linear CC/CV Li-Ion charging profile with programmable charge current via external resistor for single-cell 4.2 V batteries
- Integrated charge status and fault indicator outputs simplifying LED driver or host MCU battery status reporting
- Compact 3×3 mm VFQFPN-16 package enabling ultra-slim PCB designs in wearables and wireless earbuds
- Built-in thermal regulation limits junction temperature during fast charging, eliminating need for external thermal protection components
Applications
The L6924U is designed for USB-powered Li-Ion battery chargers in smartphones, wireless earbuds, smart watches, and Bluetooth accessories where board area is at a premium. Its linear architecture simplifies EMI compliance compared to switching chargers, making it ideal for audio wearables sensitive to switching noise near audio analog front-ends. The VFQFPN-16 package and minimal external component count reduce bill-of-materials cost for high-volume consumer electronics production.
Specifications
| Manufacturer Package Code | VFQFPN |
| YTEOL | 6.15 |
| Adjustable Threshold | NO |
| Analog IC - Other Type | LINEAR BATTERY CHARGER |
| JESD-30 Code | S-XQCC-N16 |
| JESD-609 Code | e3 |
| Number of Channels | 1 |
| Number of Functions | 1 |
| Package Body Material | UNSPECIFIED |
| Package Equivalence Code | LCC16,.12SQ,20 |
| Package Shape | SQUARE |
| Package Style | CHIP CARRIER |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Supply Current-Max (Isup) | 2.5mA |
| Supply Voltage-Max (Vsup) | 12V |
| Supply Voltage-Min (Vsup) | 2.5V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | YES |
| Temperature Grade | AUTOMOTIVE |
| Terminal Finish | Matte Tin (Sn) - annealed |
| Terminal Form | NO LEAD |
| Terminal Pitch | 0.5mm |
| Terminal Position | QUAD |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Package | Quad Flat No-Lead |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for L6924U:
Frequently Asked Questions
How is the charge current programmed on the L6924U and what is the typical programming range?
The L6924U programs its charge current through an external resistor connected to a dedicated pin, allowing designers to set currents typically from 100 mA up to 1 A depending on the resistor value and the thermal dissipation limit. This resistor-programmable approach avoids the need for an I2C interface or firmware, reducing system complexity for simple single-cell Li-Ion chargers in devices like wireless earbuds and small Bluetooth trackers.
What happens inside the L6924U when the die temperature approaches its thermal limit during USB fast charging?
The L6924U includes an on-chip thermal regulation loop that automatically reduces the charge current when the junction temperature approaches the thermal shutdown threshold, typically around 125°C. This prevents the IC from overheating in compact 3×3 mm packages with limited copper pour. The reduction is gradual and automatic, so charging continues at a derated rate rather than stopping completely, which improves user experience by maintaining some charge progress even in thermally constrained enclosures.
Is the L6924U suitable for USB Type-C 5 V charging circuits in a wearable device?
Yes, the L6924U operates from a 5 V USB input and generates the 4.2 V constant-voltage charge termination required by standard Li-Ion and Li-Polymer single cells. A linear regulator topology means no switching noise is introduced on the USB power rail, which is important for wearable devices with audio circuits sensitive to electromagnetic interference at frequencies above 100 kHz. The 3×3 mm VFQFPN-16 footprint fits within the tight PCB constraints of USB-C charging modules in fitness bands and smart rings.
How does the L6924U compare to a switching charger IC for a portable Bluetooth speaker design?
For a Bluetooth speaker running from a single 4.2 V Li-Ion cell charged via USB 5 V, the L6924U offers lower EMI and simpler layout versus a switching charger, at the cost of higher heat dissipation. At 500 mA charge current from 5 V, the linear charger dissipates roughly 400 mW as heat, which is manageable in well-ventilated enclosures. A switching charger would dissipate less than 100 mW at the same current but introduces switching harmonics above 1 MHz that may degrade the audio SNR of the Bluetooth SoC if PCB isolation is inadequate.
Related Guides
How to Choose a Ferrite Bead for EMI Suppression Rails: Selection Guide
Compare 742792651 and related ferrite beads by impedance, current rating, DCR, package, layout, and EMI test context.
Jul 10, 2026
150141BS73100 Design Guide for 3528 Status Indicator LED Circuits
Design 3528 status indicator LED circuits with 150141BS73100: current setting, resistor sizing, polarity, optics, and sourcing checks.
Jul 10, 2026
How to Choose 150141BS73100 for Wurth 3528 SMT LED Indicator Designs
Selection guide for 150141BS73100 and Wurth 3528 SMT LED variants covering color, drive current, package fit, optics, and sourcing.
Jul 9, 2026
How to Choose EEEFT1V101AP for SMD Aluminum Electrolytic Capacitor Designs
Selection guide for EEEFT1V101AP and related Panasonic EEE-FT SMD aluminum electrolytic capacitors covering voltage, ESR, lifetime, and sourcing.
Jul 9, 2026
Why Buy from FindMyChip
About STMicroelectronics
STMicroelectronics is a global semiconductor leader serving customers across the spectrum of electronics applications. ST's products are found in a wide range of applications including automotive, industrial, personal electronics, and communications.
In Stock · 24h Response · Worldwide Shipping
Response within 24 hours · Worldwide shipping
“The anti-counterfeit verification gave us confidence we'd never had with other China suppliers.”