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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Battery Chargers

STMicroelectronics L6924D013TR

Name: L6924D013TR
Brand: STMicroelectronics
SKU: L6924D013TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: L6924D013TR

Manufacturer:: STMicroelectronics

Category:: Battery Chargers

Package:: 16-VFQFN Exposed Pad

Datasheet:: L6924D013TR.pdf

Description:: IC BATT CHG LI-ION 1CEL 16VFQFPN

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Product details

Overview

L6924D013TR from STMicroelectronics is a monolithic Li-Ion/Li-Polymer battery charger IC with integrated power MOSFET, reverse-blocking diode, and sense resistor. It delivers programmable 4.1 V or 4.2 V ±1% regulated output, supports up to 1 A fast-charge current, and operates across 2.5–12 V input range in linear or quasi-pulse mode for handheld devices and USB-powered chargers.

For engineers reviewing the L6924D013TR datasheet, L6924D013TR pinout, L6924D013TR application, or L6924D013TR equivalent, key selection considerations include thermal-controlled charge termination, NTC/PTC temperature interface, dual open-collector status outputs (ST1/ST2), and gas gauge capability via IEND current-sensing.

Technical Context

The L6924D013TR implements a three-phase CC/CV charging algorithm-pre-charge, fast-charge, and voltage regulation-with independent programmability of pre-charge voltage (2.7–3.19 V), end-of-charge current (12–20 mA), and maximum charge time (up to 3 hours). Its closed-loop thermal control actively reduces charge current when junction temperature approaches 120 °C.

It supports two distinct operating modes: linear mode (for voltage-regulated adapters) and quasi-pulse mode (for current-limited adapters), where the internal MOSFET operates fully on to minimize dissipation. The device uses differentiated sensing (VOSNS) and forcing (VOUT) pins for reliable battery presence detection and maintains ±1% output voltage accuracy over temperature and load.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	4.1 V or 4.2 V selectable via VOPRG pin; ±1% accuracy ensures safe Li-ion cell voltage compliance.
Fast-Charge Current	Programmable up to 1.045 A (R_IPRG = 12 kΩ); 7% tolerance enables precise current setting with single external resistor.
Pre-Charge Threshold	2.7–3.19 V (via VPRE pin); prevents high-current charging of deeply discharged cells below safe voltage.
End-of-Charge Current	12–20 mA (R_END = 3.3 kΩ); defines CV-phase termination threshold for full capacity without overcharge.
Thermal Protection	Junction temperature limit at ~120 °C; dynamically throttles charge current to prevent thermal runaway.
Input Voltage Range	2.5–12 V; supports USB (5 V), wall adapters, and low-voltage sources including partially discharged inputs.
Package Thermal Resistance	R_thJA = 75 °C/W (demo board); enables compact PCB layout while maintaining safe power dissipation up to 0.67 W.

Pinout & Package

VFQFPN16 package (3 × 3 mm, 0.5 mm pitch) with exposed thermal pad for enhanced heat dissipation in space-constrained portable designs.

Pin/Terminal	Circuit Role	Design Meaning
VIN	Power stage input	Accepts 2.5–12 V supply; start-up threshold at 4.1 V ensures stable enable after power ramp.
VINSNS	Signal circuit supply	Provides bias for internal analog blocks; decoupling required for noise immunity during charging.
ST1 / ST2	Status outputs	Open-collector pins drive LEDs or µC GPIOs; indicate charge phase, fault, or completion states.
TPRG	Charge timer programming	Capacitor-to-GND sets max charge time (e.g., 10 nF = 3 hours); enables fail-safe timeout.
GND	Reference ground	Common return for power, signal, and thermal sensing; must be low-impedance for accurate current sensing.
SD	Shutdown control	Active-low enable: grounded = operational; floating = disabled (µA standby current).
TH	Temperature monitor	Interfaces NTC/PTC thermistor divider; disables charging if battery temperature exceeds programmed window.
VOPRG	Output voltage select	Floating = 4.1 V; tied to GND = 4.2 V; selects optimal float voltage for anode chemistry.
VOSNS	Battery voltage sense	High-impedance feedback node for CV regulation; enables accurate voltage loop without loading battery.
VOUT	Charging output	Direct connection to battery anode; integrates power MOSFET and reverse-blocking diode internally.
VREF	Internal reference	1.8 V ±2% output; supplies precision bias for VPRE, TH, and IEND circuits.
IEND	Gas gauge / termination	Sense resistor output provides real-time charging current (I_BAT ∝ V_IEND) and sets I_ENDTH.
VPRE	Pre-charge voltage control	Resistor-programmable threshold (2.7–3.19 V); also resets timer on falling edge <0.5 V.
IPRG	Fast-charge current set	Resistor-to-GND sets I_CHG; 24 kΩ yields ~490 mA, 12 kΩ yields ~975 mA (7% tolerance).
IPRE	Pre-charge current set	Floating = 10% of I_CHG; resistor to GND or VREF adjusts ratio for custom pre-charge profiles.

Key Features

Feature	Design Value
Fully integrated power stage	Eliminates external MOSFET, diode, and sense resistor - reduces BOM count and PCB area by >4 components.
Dual-mode operation	Linear mode for regulated inputs; quasi-pulse mode for current-limited sources - cuts dissipation by >50% in pulse mode.
Programmable thermal protection	NTC/PTC interface with hot/cold thresholds (10.6–14.4% and 45–55% of VREF) enables chemistry-specific temperature windows.
Gas gauge functionality	IEND pin delivers analog voltage proportional to battery current - enables µC ADC-based state-of-charge estimation.
Robust battery presence detection	Differentiated VOUT/VOSNS sensing detects open-circuit or disconnected batteries and forces standby mode automatically.
Flexible termination logic	Supports multiple end conditions: current threshold (I<IENDTH), timer expiry, or VPRE-driven reset - improves safety margin.

Applications

Handheld Devices

Digital Cameras

Use Scenario: Compact smartphones and portable media players requiring single-cell Li-ion charging from USB or proprietary adapters.

IC Role / Device Role / Timing Role: Primary battery management IC handling full CC/CV charge profile, thermal monitoring, and status reporting.

Use Value: VFQFPN16 footprint and integrated power stage reduce solution size by >30% versus discrete charger + MOSFET designs.

Use Scenario: DSLR and mirrorless cameras with removable Li-Po battery packs charged via USB-C or DC barrel jack.

IC Role / Device Role / Timing Role: Standalone charger controller managing pre-charge, fast-charge, and CV phases with LED status feedback.

Use Value: Programmable 4.1 V/4.2 V output matches graphite vs. coke anode requirements; ±1% accuracy prevents cell overvoltage.

Standalone Chargers

USB-Powered Chargers

Use Scenario: Wall-mounted or desktop chargers for consumer electronics with no host processor, relying on LED indicators only.

IC Role / Device Role / Timing Role: Autonomous charge manager using ST1/ST2 to drive dual-color LEDs for charge progress and fault indication.

Use Value: Open-collector outputs sink 10 mA each - directly drive standard LEDs without external transistors or current-limiting resistors.

Use Scenario: Portable power banks and Bluetooth headsets drawing power from USB 2.0 (500 mA) or USB BC1.2 (1.5 A) ports.

IC Role / Device Role / Timing Role: Quasi-pulse mode charger leveraging upstream current limit to minimize self-heating during bulk charge.

Use Value: Operates down to 2.5 V input - sustains charging even as USB source voltage sags under load, improving usable capacity.

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
BQ24075RGTR	Higher 1.5 A max charge current; fixed 4.2 V output; no quasi-pulse mode; requires external MOSFET for reverse blocking.	Better suited for higher-power USB host-charged devices; lacks thermal-adaptive current throttling.	Select when >1 A charge current is mandatory and thermal headroom is ample; avoid if NTC-based temperature profiling is required.
MAX1555	Fixed 4.2 V output; no programmable pre-charge voltage or end-of-charge current; no gas gauge output; smaller 10-pin µDFN.	Targeted at ultra-low-cost, minimal-feature USB chargers with basic LED status only.	Choose for cost-sensitive, non-temperature-critical applications where design simplicity outweighs flexibility.

Compared with BQ24075RGTR and MAX1555, the L6924D013TR uniquely combines integrated power FET + diode + sense resistor, dual-mode operation, and analog gas gauge output - enabling smaller, safer, and more feature-rich single-cell charging in thermally constrained layouts.

Availability

L6924D013TR is available at Aetrix Electronics and suitable for handheld devices, digital cameras, and USB-powered chargers requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for L6924D013TR 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power ICs, sensors, and analog products for industrial, automotive, and consumer markets.

The L6924D belongs to ST's battery management IC product line, engineered specifically for space-constrained, thermally sensitive Li-ion charging applications in portable electronics - emphasizing integration, safety, and ease of system-level validation.

FAQ

What is the minimum input voltage required for L6924D013TR to initiate charging?

The L6924D013TR has a 4.1 V startup threshold on VIN, but its operational input range extends down to 2.5 V. Charging begins once VIN exceeds 4.1 V and remains above that level; below 4.1 V, the device remains in shutdown regardless of SD pin state. This ensures reliable turn-on after power supply ramp-up while supporting low-voltage quasi-pulse operation once enabled.

How does the quasi-pulse mode reduce power dissipation compared to linear mode?

In quasi-pulse mode, the L6924D013TR forces its internal MOSFET into full conduction by setting ICHG higher than the upstream adapter's current limit. This collapses the adapter's output voltage to just above battery voltage plus R_DS(on) drop, minimizing (V_IN − V_BAT) × I_CHG. Power dissipation drops to I_LIM² × R_DS(on), typically <20% of linear-mode dissipation at same current.

Can the L6924D013TR safely charge a battery without an NTC thermistor?

Yes - the NTC/PTC interface on TH is optional. If left unconnected, thermal protection defaults to the internal junction sensor only, which activates at ~120 °C. However, battery-level temperature monitoring is disabled, so external thermal safeguards (e.g., pack-level cutoffs) remain necessary for full safety compliance per IEC 62133.

What is the function of the VPRE pin when not used for pre-charge voltage programming?

When VPRE is not configured with a resistor, it serves two functions: (1) if voltage falls below 0.8 V, charge termination shifts from current-threshold to timer-expiry only; (2) if voltage drops below 0.5 V on a falling edge, the TPRG timer resets. This enables hardware-triggered recharging or recovery sequences without host intervention.

L6924D013TR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 16-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

Fault Protection:: Over Temperature

Charge Current - Max:: 1A

Battery Pack Voltage:: 4.2V

Voltage - Supply (Max):: 12V

Interface:: -

Operating Temperature:: -40°C ~ 125°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 16-VFQFPN (3x3)

L6924D013TR FAQ

1.How can I place an order for L6924D013TR through Aetrix?

Please submit a Request for Quotation (RFQ) for L6924D013TR 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 L6924D013TR reliable?

The price and inventory of L6924D013TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L6924D013TR is usually 5 days.

3.What payment methods are accepted for L6924D013TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L6924D013TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L6924D013TR?

L6924D013TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L6924D013TR 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 L6924D013TR?

For technical support, including L6924D013TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L6924D013TR requirements.

6.How does Aetrix verify that L6924D013TR is sourced from the original manufacturer or authorized distributors?

All L6924D013TR 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 L6924D013TR meets industry standards.

7.What is the process for return or replacement of L6924D013TR?

All L6924D013TR units undergo pre-shipment inspection (PSI). If there is an issue with L6924D013TR, 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 L6924D013TR part is unused and in its original packaging.

Return procedure for L6924D013TR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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