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

STMicroelectronics L6924D

Name: L6924D
Brand: STMicroelectronics
SKU: L6924D
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: L6924D

Manufacturer:: STMicroelectronics

Category:: Battery Chargers

Package:: 16-VFQFN Exposed Pad

Datasheet:: L6924D.pdf

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

Quantity:: RFQ Add To RFQ list

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Product details

Overview

L6924D from STMicroelectronics is a monolithic Li-Ion/Li-Polymer battery charger IC with integrated power MOSFET, reverse-blocking diode, and current-sense resistor in a 3 × 3 mm VFQFPN16 package. 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 for USB-powered handheld devices and digital cameras.

For engineers reviewing the L6924D datasheet, L6924D pinout, L6924D application, or L6924D equivalent, key selection considerations include thermal-controlled linear/quasi-pulse charging modes, NTC/PTC temperature interface, gas-gauge-capable IEND current sensing, and flexible termination via pre-charge voltage (VPRE), end-of-charge current (IENDTH), and timer (TPRG) programming.

Technical Context

The L6924D implements a three-phase CC/CV charging algorithm-pre-charge (programmable 2.7–3.19 V threshold), fast-charge (resistor-programmed 450–1045 mA), and voltage regulation (4.1/4.2 V ±1%)-with closed-loop thermal control that reduces charge current above ~120 °C junction temperature. Its dual-mode operation adapts to voltage-regulated (linear) or current-limited (quasi-pulse) adapters by dynamically adjusting MOSFET conduction to minimize dissipation.

It integrates analog monitoring functions including battery presence detection via differential VOUT/VOSNS sensing, open-collector status outputs (ST1/ST2) for LED or µC interface, and a gas-gauge function where voltage across IEND-to-GND resistor scales linearly with delivered charge current. The TH pin accepts NTC/PTC thermistor dividers to disable charging outside user-defined thermal windows.

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 450–1045 mA (typ.) using external IPRG resistor; enables precise current matching to battery capacity.
Pre-Charge Threshold	2.7–3.19 V (programmable via VPRE); prevents high-current stress on deeply discharged cells.
Thermal Protection	Integrated junction temperature sensing with automatic current reduction above ~120 °C; avoids thermal runaway without external circuitry.
Input Voltage Range	2.5–12 V; supports direct USB 5 V, wall adapters, and low-voltage sources down to 2.5 V for quasi-pulse mode.
Package Thermal Resistance	R_thJA = 75 °C/W (demo board); enables compact PCB layout while maintaining safe junction temperatures under full load.
Gas Gauge Interface	IEND pin provides voltage proportional to battery current; allows µC ADC measurement without additional sense amplifiers.

Pinout & Package

VFQFPN16 (3 × 3 mm, 0.5 mm pitch) with exposed thermal pad; optimized for space-constrained portable applications and efficient heat dissipation.

Pin/Terminal	Circuit Role	Design Meaning
VIN	Power stage input	Accepts 2.5–12 V supply; start-up threshold at 4.1 V ensures reliable enablement from USB or adapter sources.
VINSNS	Signal supply reference	Provides stable bias for internal analog blocks; decoupling required for noise immunity in mixed-signal operation.
ST1 / ST2	Status outputs	Open-collector pins indicating charge phase or fault; drive LEDs directly or interface with µC GPIOs via pull-up resistors.
TPRG	Charge timer programming	Capacitor-to-GND sets maximum charge time (e.g., 10 nF = 3 hours); prevents overcharge during abnormal conditions.
GND	Power and signal ground	Common return path for power stage, analog circuits, and thermal pad; critical for EMI control and thermal performance.
SD	Shutdown control	Active-low enable: grounded to operate, floating to disable; supports system-level power sequencing and standby modes.
TH	Temperature monitor input	Accepts NTC/PTC thermistor divider; disables charging if sensed battery temperature falls outside programmable hot/cold thresholds.
VOPRG	Output voltage select	Floating = 4.1 V; tied to GND = 4.2 V; configures cell voltage for graphite or coke anode chemistries.
VOSNS	Battery voltage sense	High-impedance feedback node for CV regulation; enables accurate voltage control without loading battery terminals.
VOUT	Battery connection	Direct connection to single-cell Li-ion pack; includes internal reverse-blocking diode to prevent battery discharge into input.
VREF	Internal reference output	1.8 V ±2% precision reference; used externally to bias thermistor dividers or calibrate IEND current sensing.
IEND	Charge termination & gas gauge	Sinks current proportional to battery charge rate; resistor-to-GND sets termination threshold (e.g., 3.3 kΩ = 12–20 mA).
VPRE	Pre-charge voltage control	Resistor-to-GND programs VPRETH (2.7–3.19 V); floating default = 2.8 V; also resets timer on falling edge <0.5 V.
IPRG	Fast-charge current set	Resistor-to-GND programs ICHG (±7% accuracy); e.g., 24 kΩ = 450–525 mA, 12 kΩ = 905–1045 mA.
IPRE	Pre-charge current set	Floating = 10% of ICHG; connected to GND/VREF via resistor for custom IPRETH (e.g., 62 kΩ to GND = 57–78 mA).

Key Features

Feature	Design Value
Fully integrated power stage	Eliminates external MOSFET, diode, and sense resistor-reducing BOM count and PCB area in ultra-compact designs.
Dual charging modes	Linear mode for voltage-regulated inputs; quasi-pulse mode for current-limited adapters-cutting power dissipation by >50% in portable systems.
Programmable thermal window	NTC/PTC interface with user-defined hot/cold thresholds ensures battery safety across operating environments without firmware intervention.
Gas gauge–capable current sensing	IEND pin provides analog current readback-enabling state-of-charge estimation in µC-based battery management without extra ICs.
Flexible termination logic	Combines voltage, current, time, and temperature criteria-allowing robust end-of-charge detection even with aging or mismatched batteries.

Applications

Handheld Devices

Digital Cameras

Use Scenario: Compact smartphones and PDAs requiring USB-powered single-cell Li-ion charging with minimal footprint.

IC Role / Device Role / Timing Role: Primary battery charger managing CC/CV profile, thermal protection, and status reporting via ST1/ST2.

Use Value: Integrated MOSFET and sense resistor reduce solution size by >40% vs discrete chargers; VFQFPN16 fits tight board real estate.

Use Scenario: DSLR and mirrorless camera battery packs needing reliable, temperature-aware charging from AC adapters or USB-C PD.

IC Role / Device Role / Timing Role: Standalone charger IC enforcing JEITA-compliant thermal limits and precise 4.2 V regulation for high-energy-density cells.

Use Value: Programmable VPRETH and IENDTH accommodate varying cell chemistries; TH pin interface enables real-time battery temperature monitoring.

Standalone Chargers

USB-Powered Chargers

Use Scenario: Desktop or travel chargers for replaceable Li-ion battery packs used in medical monitors or portable test equipment.

IC Role / Device Role / Timing Role: Core charging controller implementing pre-charge, fast-charge, and CV phases with fault-safe shutdown.

Use Value: TPRG capacitor programming enables fixed 3-hour timeout-meeting IEC 62368-1 safety requirements for unattended charging.

Use Scenario: Portable power banks and Bluetooth headsets drawing power directly from USB 5 V bus for battery top-up.

IC Role / Device Role / Timing Role: USB-native charger supporting 2.5–5.5 V input range and automatic mode switching between linear and quasi-pulse operation.

Use Value: Quasi-pulse mode reduces thermal stress when powered from low-current USB ports-extending device lifetime and enabling fanless design.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Li-ion single-cell charging applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BQ24075RGTR	TI part uses external MOSFET; lacks integrated reverse-blocking diode and thermal loop; 4.2 V only; no quasi-pulse mode.	Requires more external components; less suitable for ultra-compact or thermally constrained layouts.	Select if existing TI ecosystem favors BQ2407x software tools and external FET flexibility is preferred.
MP2617GQ-Z	MPS part offers 4.2 V ±0.5% accuracy (vs ±1%), but no NTC/PTC interface; uses external sense resistor; no gas-gauge IEND output.	Higher voltage accuracy benefits precision applications, but lacks battery temperature monitoring and analog current readback.	Select when tighter voltage tolerance is critical and thermal monitoring is handled externally or omitted.

Compared with BQ24075RGTR and MP2617GQ-Z, the L6924D uniquely combines full integration (MOSFET + diode + sense), dual-mode charging, NTC/PTC interface, and gas-gauge functionality in a 3 × 3 mm package-making it optimal for space- and thermal-sensitive USB-powered Li-ion systems.

Availability

L6924D 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 consistent parametric performance across production batches.

Supply support for L6924D 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, delivering automotive, industrial, and consumer ICs with emphasis on power efficiency and system integration.

The L6924D belongs to ST's battery management IC product line, designed specifically for compact, thermally aware single-cell Li-ion charging in portable electronics where board space and thermal headroom are severely constrained.

FAQ

What charging modes does the L6924D support, and how are they selected?

The L6924D supports linear mode (for voltage-regulated inputs like USB or wall adapters) and quasi-pulse mode (for current-limited sources). Mode selection is automatic: when the programmed fast-charge current exceeds the upstream adapter's current limit, the device enters quasi-pulse mode-reducing power dissipation by allowing the adapter voltage to collapse near battery voltage. No external control signal is needed.

How is battery temperature monitored, and what happens if it exceeds safe limits?

The TH pin interfaces with an NTC or PTC thermistor divider to monitor battery temperature. Internal comparators detect hot (>12.5% VREF) and cold (<50% VREF) thresholds. If temperature moves outside the window, charging halts immediately and ST1/ST2 status pins reflect the fault condition-ensuring JEITA-compliant thermal protection without host processor involvement.

Can the L6924D be used without programming all its configurable parameters?

Yes. Default values apply when pins are left floating: VPRETH = 2.8 V, IPRETH = 10% of ICHG, VOPRG = 4.1 V, and TMAXCH is disabled. Only IPRG resistor is mandatory for basic operation. This simplifies prototyping and reduces BOM count for standard applications while retaining full programmability for advanced use cases.

What is the purpose of the IEND pin beyond charge termination?

The IEND pin serves dual roles: it sets the end-of-charge current threshold via an external resistor, and its voltage drop (relative to GND) is linearly proportional to actual battery charge current-functioning as an analog gas gauge. This enables microcontrollers to measure real-time current without adding external sense amplifiers or ADC references.

L6924D Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 16-VFQFN Exposed Pad

Packaging:: Tube

Product Status:: Discontinued at Digi-Key

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)

L6924D FAQ

1.How can I place an order for L6924D through Aetrix?

Please submit a Request for Quotation (RFQ) for L6924D 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 L6924D reliable?

The price and inventory of L6924D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L6924D is usually 5 days.

3.What payment methods are accepted for L6924D?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L6924D transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L6924D?

L6924D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L6924D 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 L6924D?

For technical support, including L6924D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L6924D requirements.

6.How does Aetrix verify that L6924D is sourced from the original manufacturer or authorized distributors?

All L6924D 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 L6924D meets industry standards.

7.What is the process for return or replacement of L6924D?

All L6924D units undergo pre-shipment inspection (PSI). If there is an issue with L6924D, 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 L6924D part is unused and in its original packaging.

Return procedure for L6924D:

1.Submit a request within 90 days.

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

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