XC6209B292MR-G - 2.9V 150mA LDO Regulator | Torex SOT-25
MPN: XC6209B292MR-G ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.36 | $0.36 |
| 10 | $0.32 | $3.20 |
| 100 | $0.29 | $29.00 |
| 500 | $0.26 | $130.00 |
| 1,000 | $0.23 | $230.00 |
XC6209B292MR-G Overview
An LDO (Low-Dropout) linear regulator is a type of voltage regulator that maintains a stable output voltage even when the input voltage is very close to the output voltage. LDOs sit within the broader hierarchy of linear regulators → voltage regulators → power management ICs → semiconductors, and they are preferred over switching regulators in noise-sensitive applications because they introduce no high-frequency ripple to the output rail.
Key specifications include an input voltage range up to 10 V, fixed 2.9 V output, 150 mA continuous output current, 25 µA quiescent current, low-ESR ceramic-capacitor compatibility, and built-in current-limit / short-circuit protection. The foldback current limiter also acts as an output short-circuit protector, ensuring robust behavior during fault conditions.
The XC6209B292MR-G employs a CMOS architecture with an internal reference and pass transistor, and is designed for high-speed transient response so output fluctuations remain small during sudden load steps. The series maintains stable regulation even with low-ESR ceramic output capacitors, eliminating the bulky tantalum capacitors required by older LDO designs.
Typical applications include battery-powered portable equipment, microcontroller and MCU core supply rails, IoT sensor nodes, wearable electronics, and as a post-regulator following a switching converter in mixed-rail systems. The low quiescent current extends battery life in always-on applications such as wireless sensor nodes and BLE peripherals.
When designing with this device, ensure input and output ceramic capacitors are placed as close to the IC pins as possible (typically 1 µF to 4.7 µF X7R/X5R), and verify that VIN remains at least above the dropout headroom of the regulated 2.9 V output under worst-case load to maintain regulation. Avoid reverse-biasing VIN below VOUT which can back-feed the output node.
This page synthesizes distributor pricing, drop-in alternatives from the same Torex XC6209 family, and practical design notes not found in the manufacturer datasheet. Engineers can compare same-voltage and near-voltage siblings in the same SOT-25 footprint, enabling PCB layout reuse across product variants.
Drop-in alternatives for XC6209B292MR-G — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with XC6209B292MR-G (same form factor and footprint) — differing in Maximum Output Current, Operating Temperature, Output Type, Package, Input Voltage Range.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
XC6209B302MR-G
✅ Drop-In📋 Reference alternative (not in catalog)
XC6209B282MR-G
✅ Drop-In📋 Reference alternative (not in catalog)
XC6209B272MR-G
✅ Drop-In📋 Reference alternative (not in catalog)
XC6209B332MR-G
✅ Drop-In📋 Reference alternative (not in catalog)
XC6209B182MR-G
✅ Drop-In📋 Reference alternative (not in catalog)
XC6209B292MR-G Maximum Ratings & Electrical Characteristics
| Manufacturer | Torex Semiconductor Ltd |
| Part Series | XC6209 |
| Regulator Type | Positive Fixed LDO (Low-Dropout Linear Regulator) |
| Output Type | Fixed |
| Output Voltage | 2.9 V |
| Maximum Output Current | 150 mA |
| Input Voltage Range | Up to 10 V |
| Quiescent Current | 25 µA (typical) |
| Output Capacitor | Low-ESR ceramic compatible |
| Operating Temperature | -40 °C to +85 °C |
| Package | SOT-25 (5-pin) |
| Mounting Type | Surface Mount |
| Protection Features | Current limiter with foldback, short-circuit protection |
| MSL Level | 1 (per industry standard) |
| RoHS Status | Compliant |
| Lead Free | Yes |
XC6209B292MR-G Pin Configuration
| Pin 1 | VIN — Input supply voltage |
| Pin 2 | GND — Ground |
| Pin 3 | CE — Chip Enable (active high on "B" variants) |
| Pin 4 | NC — Not connected (per datasheet) |
| Pin 5 | VOUT — Regulated 2.9 V output |
Typical Applications
XC6209B292MR-G is suitable for 6 applications: Battery-Powered IoT Sensor Nodes, Wearable Electronics & Fitness Trackers, Microcontroller Core Voltage Rail (2.9 V), Industrial Sensor Signal Conditioning, Post-Regulator After DC-DC Switching Converter, Remote Control & Consumer Handheld Devices.
Battery-Powered IoT Sensor Nodes
The XC6209B292MR-G fits low-power IoT sensor nodes because its 25 µA quiescent current extends coin-cell and Li-ion battery life, while the 2.9 V output sits just below the typical 3.0 V rail needed by BLE SoCs operating in low-power modes. According to the Torex XC6209 datasheet, the regulator holds regulation down to ~3.15 V input, covering Li-ion discharge from 4.2 V down to ~3.0 V with headroom. Placed between the battery and the SoC AVDD pin with a 1 µF X5R ceramic output cap, it adds no switching noise to sensitive analog measurements and offers foldback current limiting during sensor short-circuit faults.
Recommended
Wearable Electronics & Fitness Trackers
The XC6209B292MR-G is ideal for wearable electronics where PCB area is constrained and standby drain matters. The 5-pin SOT-25 package occupies less than 10 mm² of board area, and the 25 µA quiescent current preserves battery life during sleep intervals. The 2.9 V output is well matched to BLE radio ICs and low-power accelerometers in fitness bands. According to the Torex XC6209 datasheet, the low-ESR ceramic-capacitor compatibility eliminates the need for bulky tantalum caps, enabling the slim form factors required by wrist-worn designs.
Recommended
Microcontroller Core Voltage Rail (2.9 V)
The XC6209B292MR-G serves as a clean post-regulator for MCU core rails in mixed-rail systems, where a switching converter provides the main 3.3–5 V bus and the LDO cleans it for noise-critical analog or RF blocks. The 2.9 V fixed output matches sub-3 V MCU families and certain RF transceivers requiring a slightly lower rail than 3.3 V. According to the Torex XC6209 datasheet, the high-speed transient response keeps output fluctuation under 50 mV during sudden load steps, which is critical when an MCU transitions from sleep to active CPU execution.
Recommended
Industrial Sensor Signal Conditioning
The XC6209B292MR-G is suitable for industrial sensor modules where a stable, low-noise 2.9 V rail powers precision analog front-ends. Unlike switching regulators, it adds no high-frequency EMI that could couple into nearby analog signal paths. The 150 mA rating supports multi-sensor arrays with combined analog + digital loads. According to the Torex XC6209 datasheet, the -40 to +85 °C operating range covers industrial indoor environments, and the SOT-25 footprint fits compact sensor PCBs alongside op-amps and ADC ICs.
Recommended
Post-Regulator After DC-DC Switching Converter
The XC6209B292MR-G works as a post-regulator following a 5 V or 12 V switching converter in mixed-rail systems that need a clean 2.9 V for analog blocks. While the upstream switcher handles bulk power conversion efficiently, the LDO strips the switching ripple and noise before it reaches noise-sensitive circuits. According to the Torex XC6209 datasheet, the high PSRR of the XC6209 family rejects upstream ripple above 1 kHz, and the 25 µA quiescent current keeps standby consumption minimal when the downstream load is gated off.
Recommended
Remote Control & Consumer Handheld Devices
The XC6209B292MR-G fits handheld consumer devices such as remote controls, wireless presenters, and small appliances where battery life and PCB cost dominate the design. The fixed output eliminates external feedback resistors, saving BOM cost and board area. The SOT-25 package is compatible with hand-soldering for prototypes and reflow for production. According to the Torex XC6209 datasheet, the internal current limiter with foldback protects against output shorts that can occur when the device is dropped or exposed to mechanical stress in handheld use.
Recommended
Recommended Products Summary
Engineering reference data for XC6209B292MR-G — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | XC6209B302MR-G | XC6209B282MR-G | XC6209B272MR-G | XC6209B332MR-G | XC6209B182MR-G |
|---|---|---|---|---|---|---|
| Package | SOT-25 (5-pin) | SOT-25 (5-pin) - same | SOT-25 (5-pin) - same | SOT-25 (5-pin) - same | SOT-25 (5-pin) - same | SOT-25 (5-pin) - same |
| Brand | Torex Semiconductor | Torex Semiconductor | Torex Semiconductor | Torex Semiconductor | Torex Semiconductor | Torex Semiconductor |
| Output Voltage | 2.9 V | 3.0 V | 2.8 V | 2.7 V | 3.3 V | 1.8 V |
| Maximum Output Current | 150 mA | 150 mA | 150 mA | 150 mA | 150 mA | 150 mA |
| Input Voltage Range | Up to 10 V | Up to 10 V | Up to 10 V | Up to 10 V | Up to 10 V | Up to 10 V |
| Quiescent Current (typ) | 25 µA | 25 µA | 25 µA | 25 µA | 25 µA | 25 µA |
| Chip Enable Pin | Yes (active high) | Yes (active high) | Yes (active high) | Yes (active high) | Yes (active high) | Yes (active high) |
| Ceramic Capacitor Compatible | Yes (low-ESR) | Yes (low-ESR) | Yes (low-ESR) | Yes (low-ESR) | Yes (low-ESR) | Yes (low-ESR) |
Key Differentiators
- Fixed 2.9 V output eliminates external feedback resistors (vs XC6209B302MR-G)
- Same-family pin compatibility across the XC6209 series (vs XC6209B182MR-G)
- Low quiescent current for always-on battery applications (vs XC6209B302MR-G (same family))
Design Notes
Place the input and output ceramic capacitors as close to the IC pins as possible to minimize parasitic inductance. For the XC6209B292MR-G, a 1 µF X5R or X7R 16 V capacitor on VIN (Pin 1) and a 1 µF X5R or X7R 10 V capacitor on VOUT (Pin 5) is sufficient for most applications. Keep the ground return path short by placing the GND via adjacent to Pin 2 to suppress high-frequency ground bounce during load transients. Estimated: based on Torex XC6209 series typical application circuit in the family datasheet.
At maximum rated output of 150 mA and worst-case VIN of 10 V with VOUT of 2.9 V, power dissipation is about 1.07 W. The SOT-25 package has a typical theta_JA around 250 °C/W on a standard 1 oz copper 1-square-inch pad, giving an estimated junction temperature rise of 268 °C above ambient at full load. In practice the device rarely operates at 10 V input in this design; at 5 V VIN and 150 mA, dissipation falls to 315 mW with a 79 °C junction rise, comfortably within the 150 °C junction limit. Provide at least 50 mm² of copper pour at the GND pin for adequate heatsinking.
Do not back-feed the output by applying voltage to VOUT while VIN is absent. According to the XC6209 family datasheet, the absence of reverse-current blocking means an external voltage on VOUT can forward-bias the internal pass transistor and source current back into the input rail, potentially damaging the input supply. If reverse-current protection is required, add an external Schottky diode from VOUT to VIN. Also, ensure CE is not left floating on "B" variants - tie CE (Pin 3) to VIN through a 100 kΩ resistor to guarantee enable state in noisy environments.
Compliance Information
RoHS and lead-free per Torex product page. Halogen-free per the "-G" suffix in the part number indicating green/halogen-free packaging. Not AEC-Q100 qualified - not intended for automotive safety-critical applications.
