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

Texas Instruments BQ24104RHLR

Name: BQ24104RHLR
Brand: Texas Instruments
SKU: BQ24104RHLR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BQ24104RHLR

Manufacturer:: Texas Instruments

Category:: Battery Chargers

Package:: 20-VFQFN Exposed Pad

Datasheet:: BQ24104RHLR.pdf

Description:: IC BATT CHG LI-ION 1-2CEL 20VQFN

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Product details

Overview

BQ24104RHLR from Texas Instruments is a synchronous switched-mode Li-ion/Li-polymer battery charge-management IC with integrated power FETs, supporting 1- or 2-cell packs (4.2 V / 8.4 V), 2-A max charge current, 1.1-MHz fixed-frequency PWM control, and dual status outputs (STAT1/STAT2) for charge-in-progress and charge-done indication - used in portable media players and handheld medical devices.

For engineers reviewing the BQ24104RHLR datasheet, BQ24104RHLR pinout, BQ24104RHLR application, or BQ24104RHLR equivalent, key selection criteria include programmable precharge/fast-charge current via ISET1/ISET2, thermal monitoring via TS input, high-side current sensing at SNS, and compatibility with 3.5 mm × 4.5 mm VQFN-20 layouts requiring precise battery voltage regulation and adapter presence detection.

Technical Context

The BQ24104RHLR implements a synchronous buck topology with integrated high-side and low-side power MOSFETs, operating at 1.1 MHz with 0%–100% duty cycle control to regulate both battery voltage (4.2 V or 8.4 V selectable via CELLS pin) and charge current (fast-charge up to 2 A, precharge 15–200 mA). It uses high-side current sensing through the SNS pin with external sense resistor and supports temperature-based charge enable/disable via NTC thermistor on TS.

Charge sequencing follows three phases: preconditioning (precharge below 71.4% of V_OREG), constant-current fast charge, and constant-voltage regulation; termination occurs when charge current falls below user-programmed I_TERM (15–200 mA) or after programmable timer expiry (25–572 min via TTC capacitor). Sleep mode activates automatically when VCC drops below 3.3 V.

Key Specifications

Parameter	Value and Actual Design Meaning
Charge Voltage	4.2 V (single-cell) or 8.4 V (two-cell), selected by CELLS pin logic level - defines final battery float voltage during CV phase.
Max Charge Current	2 A (fast-charge), set by resistor on ISET1 - determines full-rate charging capability for 1–2 cell Li-ion packs.
Oscillator Frequency	1.1 MHz ±9% - enables compact external inductor/capacitor sizing and reduces audible noise in portable applications.
Current Sensing	High-side differential sensing at SNS pin - allows accurate current measurement without ground path disruption or PCB layout compromise.
Thermal Monitoring	TS input accepts NTC thermistor divider referenced to VTSB (3.15 V) - enables safe charging only within user-defined hot/cold thresholds (e.g., 0°C–45°C).
Package	VQFN-20 (3.5 mm × 4.5 mm, 0.5 mm pitch) with exposed thermal pad tied to VSS - provides low thermal resistance (R_θJA = 39.2°C/W) for sustained 2-A operation.
Input Voltage Range	4.35 V to 16 V on IN/VCC pins - supports USB, wall adapters, and automotive-derived supplies while maintaining regulation integrity.

Pinout & Package

VQFN-20 package (3.5 mm × 4.5 mm body, 0.5 mm pitch), thermally enhanced with exposed pad electrically connected to VSS - requires PCB thermal pad connection to ground plane for reliable 2-A continuous operation and junction temperature control.

Pin/Terminal	Circuit Role	Design Meaning
1, 20 OUT	Power switch output	Connects to inductor; drives synchronous buck stage - must clamp with TVS diode to PGND to suppress switching spikes.
2 STAT1	Open-drain status output	Active-low indicates charge-in-progress; paired with STAT2 to encode fault, done, or adapter-present states.
3, 4 IN	Input supply rail	Accepts 4.35–16 V DC input; shared with VCC - requires local 0.1 μF ceramic bypass to PGND.
5 PG	Power-good indicator	Open-drain output active when valid VCC detected - used for system power sequencing or LED signaling.
6 VCC	Analog supply input	Internal LDO input; must be decoupled with 0.1 μF to VSS - powers internal analog circuitry and bias references.
7 TTC	Timer capacitor connection	Sets charge timeout (25–572 min); capacitor value directly scales timing via K_TTC = 2.6 min/nF.
8 ISET1	Fast-charge current programming	Resistor-to-ground sets 150–2000 mA fast-charge current; 1 V reference yields 1000 V/A scaling factor.
9 ISET2	Precharge/termination current programming	Resistor-to-ground sets 15–200 mA precharge or 15–200 mA termination threshold - same scaling as ISET1.
10 VSS	Analog ground reference	Primary analog ground; must connect to PCB star ground point - separate from PGND except at single-point tie.
11 VTSB	TS bias regulator output	3.15 V ±10% regulated supply for NTC thermistor divider - requires 0.1–1 μF ceramic capacitor to VSS.
12 TS	Temperature sense input	Monitors NTC voltage vs. internal thresholds (LTF/HTF/TCO) - enables charge suspend outside safe thermal window.
13 NC / CELLS	No-connect or cell count select	On BQ24104RHLR: configured as CELLS pin - pull to VCC for 2-cell (8.4 V), ground/float for 1-cell (4.2 V) operation.
14 BAT	Battery voltage sense	Direct connection to battery pack positive - bypassed with 0.1 μF to PGND to reject noise from long traces.
15 SNS	High-side current sense	Differential input across external sense resistor - enables accurate current regulation without ground loop interference.
16 CE	Charger enable	Active-low digital control - pulling high suspends charge and forces sleep mode; must not tie to VTSB.
17, 18 PGND	Power ground return	High-current return path for inductor and power FETs - routed separately from VSS until single-point tie near exposed pad.
19 STAT2	Open-drain status output	Active-low indicates charge completion; combined with STAT1 state to decode full charger status per Table 1 in datasheet.

Key Features

Feature	Design Value
Integrated synchronous power FETs	Eliminates need for external MOSFETs and gate drivers - reduces BOM count and PCB area in space-constrained portable designs.
Programmable precharge and fast-charge currents	Independent resistor programming on ISET1/ISET2 enables optimized charge profiles for diverse battery chemistries and capacities.
Automatic recharge threshold	Reinitiates charge when battery voltage drops 75–125 mV/cell below regulation voltage - prevents undercharge in intermittently powered systems.
Reverse leakage protection	Blocks battery discharge back into input supply when adapter is removed - extends standby time in always-on portable equipment.
Built-in battery detection	Identifies missing or shorted battery packs before enabling charge - prevents fault conditions and improves system robustness.

Applications

Handheld Medical Devices	Portable Media Players
Use Scenario: Rechargeable Li-ion battery pack in ultrasound probe or glucose meter requiring safe, autonomous charging without host processor intervention. IC Role / Device Role / Timing Role: Stand-alone charge manager handling conditioning, CC/CV regulation, and thermal cutoff - operates independently using STAT1/STAT2 LEDs. Use Value: Enables certified medical-grade charging compliance with programmable temperature windows and automatic sleep on adapter removal.	Use Scenario: Dual-cell Li-ion pack in MP4 player needing efficient 2-A charging from USB or wall adapter with minimal heat buildup. IC Role / Device Role / Timing Role: Synchronous buck charger with integrated FETs and 1.1-MHz switching - delivers >90% efficiency while fitting tight 3.5×4.5 mm footprint. Use Value: Reduces external component count by eliminating discrete MOSFETs and drivers, lowering total solution cost and board area.
Industrial Handheld Terminals	Wearable Diagnostic Sensors
Use Scenario: Ruggedized barcode scanner operating across –20°C to 60°C ambient, requiring reliable charge management despite wide temperature swings. IC Role / Device Role / Timing Role: Temperature-monitored charger using TS input and NTC thermistor - disables charging outside user-defined LTF/HTF thresholds. Use Value: Prevents unsafe charging in cold storage or hot factory environments, meeting IEC 62368-1 battery safety requirements.	Use Scenario: Compact wearable ECG sensor with single-cell Li-polymer battery and strict size constraints (<100 mm² PCB area). IC Role / Device Role / Timing Role: High-density charge IC in VQFN-20 package - integrates power switches, current sense, and status logic in minimal footprint. Use Value: Achieves full-featured charging in ultra-small form factor without sacrificing accuracy (±0.5% voltage regulation, ±10% current regulation).

Handheld Medical Devices

Portable Media Players

Use Scenario: Rechargeable Li-ion battery pack in ultrasound probe or glucose meter requiring safe, autonomous charging without host processor intervention.

IC Role / Device Role / Timing Role: Stand-alone charge manager handling conditioning, CC/CV regulation, and thermal cutoff - operates independently using STAT1/STAT2 LEDs.

Use Value: Enables certified medical-grade charging compliance with programmable temperature windows and automatic sleep on adapter removal.

Use Scenario: Dual-cell Li-ion pack in MP4 player needing efficient 2-A charging from USB or wall adapter with minimal heat buildup.

IC Role / Device Role / Timing Role: Synchronous buck charger with integrated FETs and 1.1-MHz switching - delivers >90% efficiency while fitting tight 3.5×4.5 mm footprint.

Use Value: Reduces external component count by eliminating discrete MOSFETs and drivers, lowering total solution cost and board area.

Industrial Handheld Terminals

Wearable Diagnostic Sensors

Use Scenario: Ruggedized barcode scanner operating across –20°C to 60°C ambient, requiring reliable charge management despite wide temperature swings.

IC Role / Device Role / Timing Role: Temperature-monitored charger using TS input and NTC thermistor - disables charging outside user-defined LTF/HTF thresholds.

Use Value: Prevents unsafe charging in cold storage or hot factory environments, meeting IEC 62368-1 battery safety requirements.

Use Scenario: Compact wearable ECG sensor with single-cell Li-polymer battery and strict size constraints (<100 mm² PCB area).

IC Role / Device Role / Timing Role: High-density charge IC in VQFN-20 package - integrates power switches, current sense, and status logic in minimal footprint.

Use Value: Achieves full-featured charging in ultra-small form factor without sacrificing accuracy (±0.5% voltage regulation, ±10% current regulation).

Equivalent & Alternatives

The following parts are listed as comparable options for similar Li-ion charge management applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BQ24103ARHLR	Same VQFN-20 package and pinout; identical 4.2/8.4 V dual-cell support but lacks blinking STAT1/STAT2 feature - fixed-status outputs only.	Preferred where simple LED status (not blink-coded) suffices and cost optimization is critical - no functional change in charge algorithm or safety features.	Select BQ24103ARHLR if blinking status indication is unnecessary and lower unit cost is prioritized over visual state encoding.
BQ24105RHLR	Externally programmable charge voltage (2.1–15.5 V) via FB pin; supports LiFePO₄ (3.6 V) and higher-voltage chemistries - BQ24104RHLR is fixed at 4.2/8.4 V only.	Required for non-Li-ion chemistries or custom battery voltages; incompatible with BQ24104RHLR's CELLS-selectable architecture.	Choose BQ24105RHLR only when flexible voltage regulation beyond 4.2/8.4 V is mandatory - not a drop-in replacement for BQ24104RHLR.

Compared with BQ24104RHLR, BQ24103ARHLR offers identical core charging functionality at lower cost but omits blink-coded status, while BQ24105RHLR expands voltage flexibility at the expense of fixed dual-cell simplicity - neither is pin-compatible for blink-driven firmware, and all require matching external resistor networks for current/voltage setting.

Availability

BQ24104RHLR is available at Aetrix Electronics and suitable for handheld medical devices, portable media players, industrial handheld terminals, and wearable diagnostic sensors requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for BQ24104RHLR 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.

The bqSWITCHER™ product line - including BQ24104RHLR - was designed specifically for highly efficient, integrated Li-ion/Li-polymer charge management in space-constrained portable applications with minimal external components.

FAQ

What is the function of the CELLS pin on the BQ24104RHLR?

The CELLS pin on the BQ24104RHLR selects battery configuration: pulled low or floating for single-cell (4.2 V) operation, pulled high to VCC for two-cell (8.4 V) operation. This pin directly controls the internal voltage regulation reference and must be externally biased - it is not an NC pin on this variant, unlike some other members of the bq241xx family.

Does the BQ24104RHLR support LiFePO₄ battery chemistry?

No, the BQ24104RHLR does not support LiFePO₄ batteries. Its voltage regulation is fixed at either 4.2 V (1-cell) or 8.4 V (2-cell) and lacks the externally adjustable feedback (FB) input required for LiFePO₄'s typical 3.6 V/cell. For LiFePO₄, TI specifies the BQ24105RHLR, which includes the FB pin and 2.1–15.5 V programmability.

How is charge termination implemented in the BQ24104RHLR?

Charge termination in the BQ24104RHLR occurs when the fast-charge current falls below a user-programmed threshold set by the ISET2 resistor (15–200 mA range), verified after a 20–40 ms deglitch period. A backup programmable timer (25–572 minutes via TTC capacitor) provides fail-safe cutoff if current-based termination does not occur.

What is the purpose of the VTSB pin on the BQ24104RHLR?

The VTSB pin on the BQ24104RHLR supplies a regulated 3.15 V ±10% bias voltage for the NTC thermistor divider network connected to the TS pin. It ensures stable temperature threshold detection across input voltage and temperature variations - a 0.1–1 μF ceramic capacitor must be placed between VTSB and VSS for stability.

Can the BQ24104RHLR operate without an external sense resistor?

No, the BQ24104RHLR requires an external sense resistor between BAT and SNS to enable high-side current measurement. The device regulates charge current by maintaining a precise voltage (100–200 mV) across this resistor via its internal amplifier - omitting the resistor disables current regulation and risks overcurrent damage.

BQ24104RHLR Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: bqSWITCHER™

Package/Case:: 20-VFQFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Battery Chemistry:: Lithium Ion/Polymer

Number of Cells:: 1 ~ 2

Current - Charging:: Constant - Programmable

Programmable Features:: Current, Timer

Fault Protection:: Over Temperature, Over Voltage

Charge Current - Max:: 2A

Battery Pack Voltage:: 8.4V

Voltage - Supply (Max):: 16V

Interface:: -

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-VQFN (3.5x4.5)

BQ24104RHLR FAQ

1.How can I place an order for BQ24104RHLR through Aetrix?

Please submit a Request for Quotation (RFQ) for BQ24104RHLR 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 BQ24104RHLR reliable?

The price and inventory of BQ24104RHLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ24104RHLR is usually 5 days.

3.What payment methods are accepted for BQ24104RHLR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ24104RHLR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BQ24104RHLR?

BQ24104RHLR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BQ24104RHLR 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 BQ24104RHLR?

For technical support, including BQ24104RHLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ24104RHLR requirements.

6.How does Aetrix verify that BQ24104RHLR is sourced from the original manufacturer or authorized distributors?

All BQ24104RHLR 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 BQ24104RHLR meets industry standards.

7.What is the process for return or replacement of BQ24104RHLR?

All BQ24104RHLR units undergo pre-shipment inspection (PSI). If there is an issue with BQ24104RHLR, 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 BQ24104RHLR part is unused and in its original packaging.

Return procedure for BQ24104RHLR:

1.Submit a request within 90 days.

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

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