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Texas Instruments BQ24120RHLR
- Part No.:
- BQ24120RHLR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Chargers
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
BQ24120RHLR.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 20VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,986
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Product details
Overview
BQ24120RHLR from Texas Instruments is a single-chip, synchronous-switched-mode Li-ion/Li-polymer battery charge-management IC for 1-cell (4.2 V) standalone applications. It integrates power FETs, 1.1-MHz fixed-frequency PWM controller, high-accuracy voltage (±0.5%) and current (±10%) regulation, and dual status outputs. It delivers up to 2-A charge current with thermal shutdown, battery temperature monitoring, and enhanced EMI performance.
For engineers reviewing the BQ24120RHLR datasheet, BQ24120RHLR pinout, BQ24120RHLR application, or BQ24120RHLR equivalent, this page provides verified functional context, validated pin roles, confirmed 20-pin VQFN (3.5 mm × 4.5 mm) package mapping, real-world charging-phase behavior, and two technically documented alternative parts for 1-cell Li-ion systems.
Technical Context
The BQ24120RHLR implements a voltage-mode synchronous buck converter with integrated P-channel and N-channel MOSFETs, operating at 1.1 MHz with 0%–100% duty cycle capability. Its control loop uses internal Type-III compensation enabling stable operation with low-ESR ceramic output capacitors (4.7–47 μF).
It executes three-stage charging-preconditioning (15–200 mA), constant-current (programmable up to 2 A via ISET1), and constant-voltage (4.2 V ±0.5%)-with termination based on programmable minimum current (15–200 mA via ISET2) and safety timer (25–572 min via TTC capacitor). Battery temperature qualification uses VTSB-biased NTC sensing with LTF/HTF/TCO thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Voltage | Fixed 4.2 V ±0.5% - precise single-cell Li-ion regulation without external feedback resistors. |
| Max Charge Current | 2.0 A - set by resistor on ISET1 pin; supports fast charging of portable devices with minimal external components. |
| Switching Frequency | 1.1 MHz ±9% - enables compact magnetics and reduces input/output ripple; optimized for FCC-B EMI compliance. |
| Input Voltage Range | 4.35 V to 16 V - accommodates common wall adapters and USB-powered inputs while maintaining safe operation. |
| Thermal Shutdown | 165 °C trip with 10 °C hysteresis - protects IC and battery during sustained overload or poor PCB thermal design. |
| Quiescent Current | 315 μA in sleep mode (CE = HIGH) - minimizes standby battery drain when adapter is disconnected. |
| Package | VQFN-20 (3.5 mm × 4.5 mm) with exposed thermal pad - provides low 3.6 °C/W junction-to-board thermal resistance for high-power density layouts. |
Pinout & Package
The BQ24120RHLR is housed in a thermally enhanced 20-pin VQFN package (3.5 mm × 4.5 mm nominal body size) with an exposed thermal pad electrically connected to VSS. The pad must be soldered to a dedicated ground plane for optimal thermal performance and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pins 3,4) | Power input | Accepts 4.35–16 V adapter supply; requires 10-μF ceramic bypass to PGND for noise suppression and transient handling. |
| VCC (Pin 6) | Analog supply | Powers internal circuitry; requires 0.1-μF decoupling to VSS; shares net with IN in typical layout. |
| OUT (Pins 1,20) | Switch node | Connects to inductor; drives synchronous buck stage; requires TVS clamp to PGND for voltage spike protection. |
| SNS (Pin 15) | Current sense input | Monitors battery current via external sense resistor; requires 0.1-μF ceramic capacitor to VSS for stability. |
| BAT (Pin 14) | Battery voltage sense | Direct connection to battery anode; bypassed with capacitor if long trace inductance exists. |
| ISET1 (Pin 8) | Fast-charge current programming | Resistor-to-ground sets 150–2000 mA charge current with ±10% accuracy (K = 1000 V/A). |
| ISET2 (Pin 9) | Precharge & termination current programming | Resistor-to-ground sets 15–200 mA precharge and 15–200 mA termination current (K = 1000 V/A). |
| TTC (Pin 7) | Timer capacitor input | Capacitor-to-VSS sets total charge time (25–572 min); disables timer when pulled below 200 mV. |
| STAT1 (Pin 2) | Open-drain status output | Active-low indicates active charging; sinks up to 5 mA; used for LED or host MCU notification. |
| STAT2 (Pin 19) | Open-drain status output | Active-low indicates charge completion; paired with STAT1 to signal fault, adapter presence, or done state. |
| PG (Pin 5) | Power-good indicator | Open-drain output active when valid VCC detected; sinks up to 10 mA; signals adapter presence to system. |
| CE (Pin 16) | Charger enable | Active-low input; pulling high suspends charge and enters 315-μA sleep mode; must not tie to VTSB. |
| TS (Pin 12) | Temperature sense input | Accepts NTC-based voltage divider biased by VTSB; enables cold/hot/overtemp charge suspension per JEITA. |
| VTSB (Pin 11) | NTC bias regulator | 3.15-V ±10% output powering TS divider; requires 0.1–1-μF capacitor to VSS for stability. |
| PGND (Pins 17,18) | Power ground return | Low-impedance return path for inductor and sense resistor; separate from analog ground (VSS) but tied at single point. |
| VSS (Pin 10) | Analog ground reference | Reference for all analog circuits; connects internally to exposed thermal pad; must be solidly grounded. |
| NC (Pin 13) | No connection | Not bonded; must remain unconnected and floating in PCB layout. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous buck topology | Eliminates need for external MOSFETs or bootstrap circuitry; reduces BOM count and layout area in space-constrained designs. |
| Enhanced EMI performance | Slowed OUT pin rise time and optimized switching characteristics meet FCC-B radiated emissions without added filtering components. |
| Accurate high-side current sensing | Uses internal sense FET with ±10% regulation tolerance; avoids errors from PCB trace resistance or external shunt placement. |
| Automatic battery detection & reverse leakage protection | Prevents battery discharge when input voltage falls below battery voltage; eliminates need for external blocking diode. |
| Programmable safety timer + current-based termination | Dual-layer charge cutoff ensures reliability: timer prevents infinite charge, while current taper detects full battery state. |
| JEITA-compliant temperature qualification | Three-threshold (LTF/HTF/TCO) monitoring with deglitching enables safe charging across industrial temperature ranges. |
Applications
| Portable Media Players | Handheld Medical Devices |
|---|---|
Use Scenario: Compact, battery-powered audio/video players requiring rapid recharge between usage sessions. IC Role / Device Role / Timing Role: Primary switched-mode charger managing 1-cell Li-ion pack with automatic preconditioning, CC/CV regulation, and LED status indication. Use Value: Delivers 2-A fast charge within tight thermal envelope using integrated FETs and 1.1-MHz switching, reducing solution size vs. discrete controllers. |
Use Scenario: Portable diagnostic tools (e.g., ultrasound probes, glucose meters) needing reliable, safe battery charging in clinical environments. IC Role / Device Role / Timing Role: Safety-critical charge manager enforcing JEITA temperature windows and dual-fault termination before battery reaches full capacity. Use Value: Prevents thermal runaway via precise LTF/HTF/TCO thresholds and shuts down on overvoltage (117% VREG) or short-circuit (2.0 V/cell). |
| Industrial Handheld Scanners | Wearable Fitness Trackers |
Use Scenario: Rugged barcode scanners deployed in warehouses with variable ambient temperatures and frequent AC adapter use. IC Role / Device Role / Timing Role: Standalone charger supporting wide-input (4.35–16 V) adapters and providing robust PG/STAT signaling to host microcontroller. Use Value: Maintains ±0.5% voltage regulation across –40°C to +85°C ambient, ensuring consistent battery health in uncontrolled environments. |
Use Scenario: Ultra-low-power wearables where battery life and charging efficiency directly impact user experience. IC Role / Device Role / Timing Role: Low-quiescent (315 μA sleep) charge controller minimizing parasitic drain during idle periods between charges. Use Value: Extends time between charges by limiting standby current to sub-microamp levels when adapter is removed and CE is asserted. |
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 |
|---|---|---|---|
| BQ24075RHLR | Linear charger (no inductor), 1.5-A max, no programmable timer, no temperature qualification | Suitable only for low-power, thermally unconstrained applications where simplicity outweighs efficiency | Select BQ24075RHLR only when board space permits larger thermal footprint and efficiency >85% is not required. |
| BQ24190RGER | 2-A synchronous buck charger with USB OTG support, I²C interface, and 4.35-V default charge voltage | Requires host MCU control; adds firmware complexity but enables dynamic voltage/current adjustment and diagnostics | Choose BQ24190RGER when system-level flexibility (e.g., adaptive charging, battery health reporting) justifies added software overhead. |
Compared with BQ24120RHLR, BQ24075RHLR trades efficiency and thermal performance for layout simplicity, while BQ24190RGER adds digital configurability at the cost of standalone operation-making BQ24120RHLR optimal for cost-sensitive, fixed-parameter 1-cell systems needing minimal external components and guaranteed thermal safety.
Availability
BQ24120RHLR is available at Aetrix Electronics and suitable for portable media players, handheld medical devices, industrial scanners, and wearable fitness trackers requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.
Supply support for BQ24120RHLR 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 and embedded processing technologies, with decades of expertise in power management ICs for battery-powered systems.
The bqSWITCHER™ product line-including BQ24120RHLR-is designed specifically for high-efficiency, thermally robust, and EMI-optimized Li-ion/Li-polymer charging in space-constrained portable equipment.
FAQ
What is the exact charge voltage regulation accuracy of the BQ24120RHLR?
The BQ24120RHLR provides ±0.5% voltage regulation accuracy over temperature (0°C to 125°C) and line conditions when operating in constant-voltage mode at 4.2 V. This specification is measured under recommended operating conditions and excludes external component tolerances such as resistor dividers or sense resistors, which are not used in the BQ24120RHLR's fixed-voltage configuration.
Does the BQ24120RHLR support 2-cell battery packs?
No, the BQ24120RHLR is configured exclusively for 1-cell Li-ion/Li-polymer batteries with a fixed 4.2-V output. It lacks the CELLSEL pin or FB input found in variants like BQ24123RHLR or BQ24125RHLR, which enable 2-cell (8.4 V) or externally adjustable regulation. Attempting to use BQ24120RHLR with 2-cell packs will result in undercharging and reduced capacity.
How is charge termination implemented in the BQ24120RHLR?
The BQ24120RHLR implements dual-layer charge termination: primary termination occurs when charge current drops below a user-programmed threshold (15–200 mA via ISET2), and secondary backup uses a programmable safety timer (25–572 minutes via TTC capacitor). Both mechanisms operate independently; termination triggers when either condition is met, ensuring battery safety even if one method fails.
What thermal management features does the BQ24120RHLR include?
The BQ24120RHLR includes junction thermal shutdown at 165°C with 10°C hysteresis, plus integrated temperature qualification via the TS pin using VTSB-biased NTC sensing. It also features low thermal resistance (3.6 °C/W junction-to-board) due to its exposed-pad VQFN package, enabling efficient heat transfer to the PCB ground plane without requiring heatsinks in typical 2-A applications.
Can the BQ24120RHLR operate without an external inductor?
No, the BQ24120RHLR is a synchronous buck switching charger and requires an external power inductor (typically 10 μH) connected between the OUT pins and battery. Unlike linear chargers, it cannot function without this magnetic component, as the inductor stores and transfers energy during each switching cycle to achieve high efficiency and 2-A output capability.
BQ24120RHLR 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
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- Current, Timer
- Fault Protection:
- Over Temperature
- Charge Current - Max:
- 2A
- Battery Pack Voltage:
- 4.2V
- 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)
BQ24120RHLR FAQ
1.How can I place an order for BQ24120RHLR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ24120RHLR 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 BQ24120RHLR reliable?
The price and inventory of BQ24120RHLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ24120RHLR is usually 5 days.
3.What payment methods are accepted for BQ24120RHLR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ24120RHLR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ24120RHLR?
BQ24120RHLR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ24120RHLR 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 BQ24120RHLR?
For technical support, including BQ24120RHLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ24120RHLR requirements.
6.How does Aetrix verify that BQ24120RHLR is sourced from the original manufacturer or authorized distributors?
All BQ24120RHLR 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 BQ24120RHLR meets industry standards.
7.What is the process for return or replacement of BQ24120RHLR?
All BQ24120RHLR units undergo pre-shipment inspection (PSI). If there is an issue with BQ24120RHLR, 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 BQ24120RHLR part is unused and in its original packaging.
Return procedure for BQ24120RHLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BQ24120RHLR Tags
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BQ21040DBVR
Texas Instruments
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MCP73812T-420I/OT
Microchip Technology
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MCP73831T-2ACI/OT
Microchip Technology
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MCP73832T-2DCI/OT
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MCP73831T-2ATI/OT
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MCP73832T-2ATI/OT
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MCP73831T-5ACI/OT
Microchip Technology
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MCP73832T-2ACI/MC
Microchip Technology
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Microchip Technology
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MCP73831T-2ATI/MC
Microchip Technology
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