XC6209B292MR - 2.9V 150mA LDO Regulator SOT-25 | Torex
MPN： XC6209B292MR ✓ 啟用中XC6209B292MR 概覽
An LDO (low-dropout) linear regulator is a type of voltage regulator that maintains a stable output voltage even when the input voltage is only marginally above the desired rail. Within the broader power-management hierarchy, LDOs sit beneath switching converters and below traditional NPN/PNP regulators; they trade conversion efficiency for low noise, fast transient response, and a minimal external bill of materials, which is why LDOs are almost always placed downstream of a switching pre-regulator to clean up residual ripple.
Key features of the XC6209B292MR include an output voltage accuracy of plus or minus 2 percent, a maximum output current of 150 mA, an ultra-low quiescent current of 25 uA typical, and built-in current-limit plus thermal-shutdown protection. Its CE pin enables shutdown mode that drops the quiescent current to less than 0.1 uA, supporting battery-powered duty-cycled loads. The device accepts input voltages up to 6 V and works with low-ESR ceramic output capacitors as small as 1 uF, simplifying PCB layout.
Internally, the XC6209B292MR uses a CMOS pass transistor with a precision bandgap reference and error amplifier. The series is offered in fixed output voltages from 0.9 V to 5.0 V in 0.1 V increments, with the '292' suffix here selecting the 2.9 V nominal rail and 'B' denoting the CE-active-high, low-quiescent variant.
Typical applications include cellular-phone and portable-electronics power rails, microcontroller core or I/O supplies, battery charger secondary rails, optical-module bias, and post-regulation after a switching converter. Designers favor the XC6209B292MR where the load demands a quiet, well-regulated 2.9 V source and board area is constrained.
When using this regulator, place the input and output ceramic capacitors as close as possible to the VIN and VOUT pins to suppress input-spike transients and to maintain loop stability. Avoid routing high-frequency switching traces near the feedback node to minimize noise injection.
This page combines datasheet, distributor pricing, parametric drop-in alternatives, and application design notes so engineers can evaluate and source the XC6209B292MR with confidence.
直接替換替代品，適用於 XC6209B292MR — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： XC6209B292MR （相同外形與佔位） — 差異在於 Input Voltage Range, Operating Temperature, Output Capacitor, Output Type, Quiescent Current.
XC6209B292MR-G
✅ 直接替換聯絡詢價
查看資料表 →XC6209B332MR
✅ 直接替換📋 參考替代品（不在目錄中）
XC6209B502MR
✅ 直接替換📋 參考替代品（不在目錄中）
XC6209B182MR
✅ 直接替換📋 參考替代品（不在目錄中）
S-812C33AMC-C2NT2G
✅ 直接替換📋 參考替代品（不在目錄中）
NCP698SQ30T1G
✅ 直接替換📋 參考替代品（不在目錄中）
RP111N281B-TR-FE
✅ 直接替換📋 參考替代品（不在目錄中）
XC6209B292MR 最大額定值與電氣特性
| 輸出類型 | Fixed (positive) |
| Nominal Output Voltage | 2.9 V |
| Output Voltage Accuracy | plus or minus 2 % |
| 最大輸出電流 | 150 mA |
| 輸入電壓範圍 | up to 6 V |
| 靜態電流 | 25 uA typical |
| Standby Current (CE = Low) | less than 0.1 uA |
| 工作溫度 | -40 C to +85 C |
| 封裝 | SOT-25 (5-pin) |
| 安裝類型 | Surface Mount |
| Output Capacitor | Low-ESR ceramic, 1 uF minimum |
| CE (Enable) Pin Logic | Active-high |
| Protection | Current limit, thermal shutdown |
| RoHS 狀態 | Compliant |
XC6209B292MR 腳位配置
| 腳位 1 | VIN — Input supply voltage (up to 6 V) |
| 腳位 2 | GND — Ground |
| 腳位 3 | CE — Chip enable (active high) |
| 腳位 4 | NC — No internal connection on B-series |
| 腳位 5 | VOUT — Regulated 2.9 V output |
典型應用
XC6209B292MR 適用於 7 應用s: Portable / Battery-Powered Device Rails, Cellular Phone Sub-Rail Generation, Optical Module Bias Supply, Microcontroller Core and I/O Rails, Sensor Front-End Power, Post-Regulation After a Switching Converter, Battery Charger Secondary Rails.
Portable / Battery-Powered Device Rails
The XC6209B292MR's 25 uA quiescent current and sub-0.1 uA standby current make it ideal for portable and battery-powered loads that duty-cycle between active and sleep states. The 2.9 V fixed output is well suited for low-power MCUs, Bluetooth Low Energy SoCs, and sensor front-ends that operate from a single Li-ion or two-AA cells. Placed near the battery terminal, it provides a clean rail that does not drain the cell during idle periods. Designers should budget worst-case VIN minus VOUT times IOUT dissipation to ensure the SOT-25 package stays within its 0.5 W thermal envelope.
推薦
Cellular Phone Sub-Rail Generation
Cellular handsets and feature phones use the XC6209B292MR as a post-LDO after a switching converter to supply 2.9 V rails for camera modules, LCD bias, or RF PA pre-drivers. The LDO cleans switching ripple that would otherwise couple into the PA or ADC reference. The 150 mA rating covers most sub-rail demands in feature-phone architectures. Use a 1 uF X5R input cap and 1 uF X5R output cap within 5 mm of the IC pins per the Torex layout note.
推薦
Optical Module Bias Supply
SFF/SFP optical modules and fiber-optic transceivers often require a 2.9 V bias for the laser driver or limiting amplifier. The XC6209B292MR provides this rail from a 3.3 V host supply, holding the LDO inside its low-dropout region. The low output noise helps prevent laser-driver threshold jitter that would degrade optical eye margin. Designers should verify the 150 mA budget covers the laser's peak bias and modulation currents combined.
推薦
Microcontroller Core and I/O Rails
Many low-voltage MCUs, including several ARM Cortex-M0 and 8051 cores, accept supply rails from 2.7 V down to 1.8 V. The XC6209B292MR's 2.9 V fixed output fits neatly above this floor with margin to ride out battery droop. The 150 mA rating easily covers core plus I/O plus peripheral current. Place the regulator close to the MCU's VDD pin to minimize IR drop on the PCB trace.
推薦
Sensor Front-End Power
MEMS accelerometers, gyroscopes, and environmental sensors draw only a few milliamps but need a low-noise supply. The XC6209B292MR delivers a clean 2.9 V to such sensors with the 1 uF ceramic output cap suppressing any high-frequency noise. The CE pin allows the host MCU to power-gate the sensor chain during deep-sleep, dropping Iq below 0.1 uA.
推薦
Post-Regulation After a Switching Converter
A common power-architecture pattern is a switching buck regulator followed by an LDO for the noise-sensitive analog or RF rails. The XC6209B292MR serves as the post-LDO stage, removing switching ripple that would otherwise couple into audio codecs, ADCs, or RF synthesizers. The 6 V maximum input handles typical 3.3 V or 5 V upstream rails comfortably. Choose the XC6209B292MR when the analog load needs 2.9 V at less than 150 mA.
推薦
Battery Charger Secondary Rails
Li-ion battery charger ICs sometimes need a clean low-voltage rail to bias internal references or status LEDs. The XC6209B292MR provides that rail from the system 3.3 V or 5 V bus. The 25 uA Iq does not steal meaningful current from the charger budget, and the small SOT-25 footprint fits beside the charger IC without crowding the PCB.
推薦
推薦產品摘要
工程參考資料，適用於 XC6209B292MR — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | XC6209B292MR-G | XC6209B332MR | XC6209B502MR | S-812C33AMC-C2NT2G | NCP698SQ30T1G | RP111N281B-TR-FE |
|---|---|---|---|---|---|---|---|
| Package | SOT-25 | SOT-25 - same | SOT-25 - same | SOT-25 - same | SOT-23-5 - same | SOT-23-5 - same | SOT-23-5 - same |
| Brand | Torex Semiconductor | Torex Semiconductor | Torex Semiconductor | Torex Semiconductor | ABLIC | onsemi | NXP Semiconductors |
| Output Voltage | 2.9 V | 2.9 V | 3.3 V | 5.0 V | 3.3 V | 3.0 V | 2.8 V |
| Maximum Output Current | 150 mA | 150 mA | 150 mA | 150 mA | 50 mA | 200 mA | 150 mA |
| CE Pin Logic | Active-high | Active-high | Active-high | Active-high | Active-high | Active-high | Active-high |
| RoHS Compliance | Compliant | Compliant | Compliant | Compliant | Compliant | Compliant | Compliant |
主要差異化特點
- Same-family 2.9 V option within Torex XC6209B (對比XC6209B332MR)
- Higher output current than ABLIC equivalent (對比S-812C33AMC-C2NT2G)
- Higher output current margin than NXP equivalent (對比RP111N281B-TR-FE)
設計說明
Place the input capacitor (1 uF X5R minimum) within 5 mm of the VIN pin and the output capacitor (1 uF X5R minimum) within 5 mm of the VOUT pin per the Torex XC6209 datasheet layout guideline. Use short, wide copper pours to minimize parasitic inductance that could destabilize the control loop. Route the CE pin away from switching nodes to avoid noise injection into the enable logic.
Estimated: at VIN=3.6 V (single-cell Li-ion), VOUT=2.9 V, and IOUT=150 mA, the package dissipation is (3.6 minus 2.9) times 0.150 = 0.105 W. The SOT-25 has a theta_JA of about 250 C/W, so the junction rises roughly 26 C above ambient - within the 125 C limit. At VIN=5.5 V and 150 mA, dissipation rises to 0.39 W and junction temperature climbs about 98 C, still safe but with reduced margin.
Do not omit the output capacitor or substitute a high-ESR tantalum part; the XC6209B requires a low-ESR ceramic (X5R/X7R) output cap of at least 1 uF for loop stability per the Torex datasheet. Do not exceed the 6 V absolute-maximum VIN. The CE pin must be tied to VIN if shutdown is not used - leaving it floating can cause indeterminate output. Avoid running the part in dropout (VIN minus VOUT less than 200 mV) at full load because PSRR degrades.
合規資訊
The XC6209B292MR is supplied in lead-free matte-tin finish; the '-G' suffix denotes the RoHS-compliant tape-and-reel packaging option. AEC-Q100 qualification is not applicable for this consumer-grade LDO. Always confirm the latest compliance certificate with the Torex distributor of record.
