BQ24133QRGYRQ1 - 2.5A 1-3 Cell Buck Charger Q1 | TI
MPN: BQ24133QRGYRQ1 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.95 | $3.95 |
| 10 | $3.55 | $35.50 |
| 100 | $3.16 | $316.00 |
| 500 | $2.84 | $1,420.00 |
| 1,000 | $2.53 | $2,530.00 |
Drop-in alternatives for BQ24133QRGYRQ1 β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
BQ24133RGYR
β Drop-Inβ In Stock
$3.1 / Unit
View Datasheet βBQ24133RGYT
β Drop-Inπ Reference alternative (not in catalog)
BQ24133QRGYTQ1
β Drop-Inπ Reference alternative (not in catalog)
BQ24133RGER
β Drop-Inπ Reference alternative (not in catalog)
BQ24179RGYR
β‘ Same Packageπ Reference alternative (not in catalog)
BQ24133QRGYRQ1 Maximum Ratings & Electrical Characteristics
| Battery Chemistry | Li-Ion / Li-Polymer |
| Cell Count | 1, 2, or 3 cells (4.2 V/cell) |
| Maximum Charge Current | 2.5 A |
| Topology | Synchronous buck (switched-mode) |
| Switching Frequency | 1.6 MHz |
| Peak Efficiency | Up to 92% |
| Input Operating Voltage | 4.5 V to 17 V |
| Input Absolute Maximum Rating | 30 V with adjustable overvoltage protection |
| Integrated MOSFETs | Two N-channel power MOSFETs |
| Power Path | Automatic adapter/battery selector with dynamic power management |
| Battery Temperature Monitoring | TS pin NTC window monitoring |
| Control Type | Stand-alone (no host processor required) |
| Package | VQFN-24 (RGY) 5.5 x 3.5 mm |
| Mounting Type | Surface Mount |
| Automotive Qualification | AEC-Q100 qualified (Q1) |
| RoHS Status | Compliant |
BQ24133QRGYRQ1 Pin Configuration
| Pin 1 | ACN β Input current sense negative |
| Pin 2 | ACP β Input current sense positive / adapter power |
| Pin 3 | VAC β Adapter voltage detect input |
| Pin 4 | OVPSET β Input overvoltage protection threshold set |
| Pin 5 | BTST β High-side gate driver bootstrap |
| Pin 6 | SW β Switching node (inductor connection) |
| Pin 7 | PGND β Power ground |
| Pin 8 | CSN β Charge current sense negative |
| Pin 9 | CSP β Charge current sense positive / battery sense |
| Pin 10 | TS β Battery temperature NTC monitor |
| Pin 11 | VREF β Reference output |
| Pin 12 | TERM β Termination threshold program |
| Pin 13 | ISET2 β Input current limit program |
| Pin 14 | ISET1 β Charge current program |
| Pin 15 | CELL β Cell count selection (1/2/3) |
| Pin 16 | CE β Chip enable |
| Pin 17 | PGATE β Power path selector gate drive |
| Pin 18 | AGND β Analog ground |
| Pin 19 | STAT β Charge status output |
| Pin 20 | PGOOD β Power good indicator |
| Pin 21 | REGN β LDO bias supply output |
| Pin 22 | DPM β Dynamic power management sense |
| Pin 23 | SYS β System power path output sense |
| Pin 24 | BOTFET β Battery disconnect FET drive |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this digital IC. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
BQ24133QRGYRQ1 is suitable for 6 applications: Automotive Telematics and Infotainment Backup, Industrial Handheld Instruments, Portable Medical Devices, Battery-Backed Servers and Gateways, POS Terminals and Rugged Handhelds, IoT and Smart-Home Backup Power.
Automotive Telematics and Infotainment Backup
The BQ24133QRGYRQ1 is AEC-Q100 qualified and tolerates a 30-V input with adjustable overvoltage protection, matching load-dump-protected automotive 12-V rails. Its 1.6-MHz synchronous buck charges 1-3 cell Li-Ion backup batteries at up to 2.5 A with 92% peak efficiency, minimizing heat in sealed modules. The automatic power path keeps telematics units alive during crank or adapter dropout by seamlessly switching between adapter and battery, while NTC-based temperature window monitoring enforces safe pack charging.
Recommended
Industrial Handheld Instruments
Battery-powered field instruments benefit from the stand-alone operation of the BQ24133: resistor-programmed charging with no host MCU reduces firmware complexity. The 4.5-V to 17-V input accepts universal wall adapters, and 2.5-A charging refills 2-cell or 3-cell packs quickly. Up to 92% efficiency and 1.6-MHz switching allow a small inductor, keeping handheld enclosures compact. Power path selection lets the tool run directly from the adapter even with a fully discharged battery.
Recommended
Portable Medical Devices
Portable diagnostic and monitoring devices require quiet, efficient, and safe battery charging. The BQ24133's high-accuracy regulation of charge current and voltage protects sensitive Li-Polymer packs, while the TS-pin NTC window prevents charging outside safe temperatures - a patient-safety concern. The synchronous 1.6-MHz buck avoids low-frequency ripple near signal bands, and power path management guarantees uninterrupted operation during battery exchange, critical for mobile medical instrumentation.
Recommended
Battery-Backed Servers and Gateways
Network gateways and server BMC subsystems use the BQ24133 to maintain UPS-style battery backup. The 17-V operating input supports common 12-V intermediate buses, and dynamic power management limits adapter current draw when the source is overloaded. Charging a 3-cell (12.6-V) battery at up to 2.5 A provides meaningful ride-through time, and automatic adapter-to-battery transition occurs without host intervention, ensuring network hardware stays online through power interruptions.
Recommended
POS Terminals and Rugged Handhelds
Payment terminals and rugged scanners demand fast recharge times between shifts. The BQ24133 charges 1-2 cell packs at up to 2.5 A - a typical 2000-mAh cell refills in roughly one hour. Adjustable input OVP (30-V rating) protects against miswired adapters, a real field hazard. The stand-alone architecture with thermal regulation and NTC battery monitoring delivers certified-safety charging behavior without adding a supervisory MCU, simplifying product certification.
Recommended
IoT and Smart-Home Backup Power
Smart hubs, door controllers, and security panels require seamless failover to battery during outages. The BQ24133's automatic power path selector maintains the system rail from the adapter while trickle-refilling the backup cell; on adapter loss, the battery takes over instantly with no brownout. The 4.2 V/cell precision keeps small 1-cell Li-Ion backup batteries healthy for years, and stand-alone operation removes firmware maintenance burden from cost-sensitive IoT products.
Recommended
Recommended Products Summary
Engineering reference data for BQ24133QRGYRQ1 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | BQ24133RGYR | BQ24133RGYT | BQ24133QRGYTQ1 | BQ24179RGYR |
|---|---|---|---|---|---|
| Package | VQFN-24 (RGY) 5.5x3.5 mm | VQFN-24 (RGY) - same | VQFN-24 (RGY) - same | VQFN-24 (RGY) - same | VQFN-24 (RGY) - same footprint, different pinout |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Automotive Qualification | AEC-Q100 (Q1) | No | No | Yes (Q1) | No |
| Max Charge Current | 2.5 A | 2.5 A | 2.5 A | 2.5 A | [DATA_NEEDED] |
| Cell Count | 1-3 cells (4.2 V/cell) | 1-3 cells | 1-3 cells | 1-3 cells | 1-4 cells |
| Switching Frequency | 1.6 MHz | 1.6 MHz | 1.6 MHz | 1.6 MHz | [DATA_NEEDED] |
| Input Voltage Range | 4.5 V to 17 V (30 V max) | 4.5 V to 17 V | 4.5 V to 17 V | 4.5 V to 17 V | [DATA_NEEDED] |
| Control Interface | Stand-alone (resistor programmed) | Stand-alone | Stand-alone | Stand-alone | I2C host controlled |
| Packaging | Tape & Reel (3000) | Tape & Reel | Tray | Tray | Tape & Reel |
Key Differentiators
- AEC-Q100 automotive qualification (vs BQ24133RGYR)
- Fully integrated power stage (vs BQ24179RGYR)
- 30-V input tolerance with adjustable OVP (vs BQ24133RGYT)
Design Notes
Keep the synchronous buck power loop tight: place the input capacitor, integrated MOSFET SW node, inductor, and PGND as close as possible. Use a solid ground plane with multiple thermal vias under the VQFN-24 exposed pad (5.5x3.5 mm). At 2.5 A and 1.6 MHz, loop inductance drives switching spikes; follow the layout example in TI datasheet Rev. D Section on application/layout guidelines.
Size the inductor for 1.6-MHz operation and 2.5-A peak current with adequate saturation margin; verify ripple current against the datasheet design equations. Set the input current limit (ISET2) below the adapter rating so dynamic power management (DPM) throttles charge current before collapsing the source. Program the OVPSET divider so 30-V transient tolerance and adapter OVP align with your source spec.
Do not omit the TS NTC divider - the charger will not start without a valid temperature window, and an open TS pin halts charging. Confirm the CELL pin strapping matches the pack (4.2/8.4/12.6 V), as misprogramming overcharges the battery. Ensure CE pin control matches power sequencing intent, and verify STAT/PGOOD pull-up rails are alive during boot for correct host status readback.
Compliance Information
Q1 suffix indicates AEC-Q100 qualification per TI product page. RoHS/lead-free status per standard TI green packaging; verify REACH and halogen-free status on TI product page for latest declarations.
