MIC5209-3.3YS-TR - 500mA 3.3V Low-Noise LDO | Microchip
料号： MIC5209-3.3YS-TR ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0.52 | $0.52 |
| 10 | $0.46 | $4.60 |
| 100 | $0.39 | $39.00 |
| 500 | $0.34 | $170.00 |
| 1,000 | $0.29 | $290.00 |
MIC5209-3.3YS-TR 概述
An LDO (low-dropout regulator) is a type of linear voltage regulator that maintains a regulated output voltage even when the input supply is only slightly above the output. Within the power management IC hierarchy, LDOs sit downstream of switching converters or battery rails, providing clean, low-noise point-of-load regulation for analog and digital loads.
Key features of the MIC5209-3.3YS-TR include 500 mA output current capability, ultra-low dropout for extended battery runtime, low ground current to prolong battery life in hand-held devices, better than 1% output voltage accuracy, and internal protection consisting of reversed-battery protection, current limiting, and overtemperature shutdown. Ultra-low-noise capability is a hallmark of the MIC5209 family.
Architecturally, the MIC5209 uses a precision voltage reference and error amplifier driving a PNP pass element, which enables the very low dropout figure. The low quiescent (ground) current is deliberately optimized for battery-powered operation, and the SOT-223 package offers a thermally efficient tab that doubles as the output pin, simplifying PCB thermal design.
Typical applications include hand-held and battery-powered instruments, cordless telephones, portable computing and communication devices, electronic scales, and general-purpose point-of-load regulation from 5 V or Li-ion rails down to a 3.3 V logic or analog rail.
Design consideration: at 500 mA load with a large input-to-output differential, power dissipation in the SOT-223 package becomes the limiting factor; keep VIN-VOUT small or provide adequate copper area on the tab.
This page synthesizes distributor pricing, drop-in alternatives, design notes, and application guidance not found in the manufacturer datasheet.
直接替换替代料： MIC5209-3.3YS-TR ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： MIC5209-3.3YS-TR （相同外形与封装尺寸） ——差异在于 Output Type, Output Voltage Accuracy, Package, Protection Features, RoHS Status.
快速对比工具——选择替代料号进行并排对比：
MIC5209-3.3YS
✅ 直接替换✓ 有现货
$0.58 / 个
查看数据手册 →MIC5209-4.2YS-TR
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
MIC5209-5.0YS-TR
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
MIC5209-2.5YS-TR
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
MIC5209-3.3YS-TR 最大额定值与电气特性
| 输出类型 | Positive Fixed |
| 输出电压 | 3.3 V |
| 最大输出电流 | 500 mA |
| Output Voltage Accuracy | better than 1% |
| 压差电压 | 10 mV typical at light load; less than 500 mV at full load |
| Noise | Ultra-low noise (per Microchip datasheet) |
| Protection Features | Reversed-battery protection, current limiting, overtemperature shutdown |
| 输出数量 | 1 |
| 封装 | SOT-223-3 (4-pin, 3 + tab) |
| 安装类型 | Surface Mount |
| Typical Applications | Hand-held, battery-powered devices |
| RoHS 状态 | RoHS Compliant |
| Lead Free Status | Lead Free |
| Packaging | Tape & Reel (TR) |
MIC5209-3.3YS-TR 引脚配置
| 引脚 1 | VIN — Regulator input supply |
| 引脚 2 | GND — Ground |
| 引脚 3 | VOUT — Regulated 3.3 V output |
| 引脚 Tab | VOUT — Output tab, also thermal path (per datasheet) |
典型应用
MIC5209-3.3YS-TR 适用于 6 应用s: Hand-Held Battery-Powered Devices, Portable Communication Equipment, Point-of-Load Regulation from 5V Rails, Electronic Scales and Instrumentation, Portable Computing Peripherals, IoT Sensor Nodes and Smart Home Devices.
Hand-Held Battery-Powered Devices
The MIC5209-3.3YS-TR was designed specifically for hand-held, battery-powered equipment. Its very low dropout voltage - typically 10 mV at light loads and less than 500 mV at full 500 mA load - lets the regulator keep delivering a solid 3.3 V rail even as a Li-ion cell discharges close to the output voltage, extracting more usable energy per charge. Low ground current further prolongs battery life at standby. Placed directly after the battery with 1-10 uF output capacitance, it supplies microcontrollers, displays, and wireless modules with a clean, low-noise rail; reversed-battery protection guards against incorrect cell insertion, a common field failure in consumer products.
推荐
Portable Communication Equipment
Cordless phones, RF modems, and portable radios benefit from the MIC5209-3.3YS-TR's ultra-low-noise linear regulation, which adds no switching spurs to the RF receive chain. A 500 mA capacity covers the peak transmit bursts of many sub-GHz and 2.4 GHz radio modules while the better-than-1% output accuracy keeps oscillator and PA bias within spec across temperature. In a typical design the LDO sits between a 4.5-6 V adapter or 2-cell battery and the radio's 3.3 V VCC pin, with 1 uF input and 2.2-10 uF output ceramic capacitors placed within a few millimeters of the pins to preserve the low-noise performance at the load.
推荐
Point-of-Load Regulation from 5V Rails
Dropping a 5 V system rail to 3.3 V is an ideal use case for the MIC5209-3.3YS-TR because the input-to-output differential is only 1.7 V; at 500 mA this dissipates an estimated 0.85 W, which the SOT-223 tab can handle with a modest copper pour. The better-than-1% accuracy and low noise make it preferable to a buck converter for analog references, precision sensors, and ADC front ends that would otherwise pick up switching ripple. It is commonly used as a post-regulator after a switching supply, combining the efficiency of the buck with the cleanliness of a linear stage at the most noise-sensitive load.
推荐
Electronic Scales and Instrumentation
Electronic scales and portable instruments pair load cells and precision amplifiers with the MIC5209-3.3YS-TR because output noise translates directly into measurement jitter. The regulator's ultra-low-noise operation and better-than-1% output accuracy give the analog front end a stable rail, improving zero-point repeatability and gain stability. Its 500 mA output also powers the microcontroller and display backlight from the same rail, consolidating the power tree. Battery operation is common in these products, so the MIC5209's low ground current and 10 mV light-load dropout keep the instrument running deeper into the battery discharge curve than higher-dropout alternatives.
推荐
Portable Computing Peripherals
Accessories such as portable storage adapters, USB hubs for embedded hosts, and handheld data loggers use the MIC5209-3.3YS-TR to derive a 3.3 V logic rail from a 5 V USB source. The 1.7 V differential keeps dissipation to an estimated 0.85 W at the full 500 mA load, within the SOT-223's capability with a tab copper area, and the low-noise output is gentler on sensitive clock and oscillator circuits than a switching regulator. Current limiting and overtemperature shutdown provide fault tolerance against shorted accessories or blocked ventilation, improving field reliability in consumer and industrial docking hardware.
推荐
IoT Sensor Nodes and Smart Home Devices
Wi-Fi and Zigbee sensor nodes experience large load transients between idle (microamps to milliamps) and radio TX bursts approaching hundreds of milliamps. The MIC5209-3.3YS-TR handles this profile well: 10 mV typical light-load dropout and low ground current maximize life on primary cells, while 500 mA capacity absorbs transmit bursts without drooping the rail below the radio's brownout threshold. A 10 uF output capacitor with low ESR is recommended to keep transient response tight during burst mode. The SOT-223 package is easy to hand-solder for prototyping and reflows reliably in volume assembly.
推荐
推荐产品汇总
工程参考数据： MIC5209-3.3YS-TR ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | MIC5209-3.3YS | MIC5209-4.2YS-TR | MIC5209-5.0YS-TR | MIC5209-2.5YS-TR |
|---|---|---|---|---|---|
| Package | SOT-223-3 | SOT-223-3 - same | SOT-223-3 - same | SOT-223-3 - same | SOT-223-3 - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Output Voltage | 3.3 V | 3.3 V | 4.2 V | 5.0 V | 2.5 V |
| Output Current | 500 mA | 500 mA | 500 mA | 500 mA | 500 mA |
| Output Accuracy | better than 1% | better than 1% | better than 1% | better than 1% | better than 1% |
| Dropout Voltage (full load) | < 500 mV | < 500 mV | < 500 mV | < 500 mV | < 500 mV |
| Enable/Shutdown Pin | No (SOT-223) | No | No | No | No |
| Packaging | Tape & Reel | Tube | Tape & Reel | Tape & Reel | Tape & Reel |
关键差异点
- Very low light-load dropout extends battery life （对比 MIC5209-5.0YS-TR)
- Identical footprint across the fixed-voltage family （对比 MIC5209-4.2YS-TR)
- Trade-off: no enable/shutdown in this package （对比 MIC5209-3.3YM (SOIC-8))
设计说明
Estimated: with VIN = 5 V, VOUT = 3.3 V, and IOUT = 500 mA, power dissipation is (5 - 3.3) x 0.5 = 0.85 W. The SOT-223 tab (connected to VOUT) should be soldered to at least 1 square inch of 1-oz copper to keep junction temperature well below the shutdown threshold. For larger differentials (e.g., 12 V input), dissipation rises to about 4.35 W and a switching preregulator should be used instead.
Place a 1 uF ceramic capacitor on the input and at least 2.2 uF low-ESR capacitance on the output, as close to the pins as possible, per the Microchip MIC5209 datasheet typical application circuits. Connect the VOUT tab to the output copper plane both for current capacity and heat spreading. Keep the ground return path short and star-ground the analog load to preserve the low-noise benefit of linear regulation.
Do not assume the SOT-223 version has an enable pin - shutdown is available only on the SOIC-8 and DDPAK MIC5209 versions. Also confirm input voltage headroom: dropout can reach nearly 500 mV at full 500 mA load, so a 3.6 V input is marginal at heavy load. Finally, the -TR suffix is only packaging; ordering the tube version (MIC5209-3.3YS) yields the identical part for prototyping.
合规信息
RoHS compliant and lead free per digchip specification listing. REACH, halogen-free, and conflict minerals status not stated in provided data.
