LD39015M33R - 150mA, 3.3V Ultra-Low Noise LDO | STMicroelectronics
部品番号: LD39015M33R ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $0.45 | $0.45 |
| 10 | $0.38 | $3.80 |
| 100 | $0.3 | $30.00 |
| 500 | $0.25 | $125.00 |
| 1,000 | $0.2 | $200.00 |
LD39015M33R 概要
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. Unlike standard linear regulators that require a larger dropout voltage, LDOs use a pass transistor operating in the saturation region to achieve low dropout, making them essential in battery-powered devices where maximizing usable battery voltage is critical. In the power management hierarchy, an LDO is a type of linear regulator, which is a subset of voltage regulators, which in turn are key components of power management ICs (PMICs) used across virtually all electronic systems.
Key features of the LD39015M33R include an ultra-low output noise of 30uVrms (typical) over a 10Hz to 100kHz bandwidth, a high power supply rejection ratio (PSRR) of 60dB at 1kHz, and a low quiescent current of 40uA (typical). The device also incorporates internal current limiting and thermal shutdown protection, ensuring robust operation under fault conditions. The fixed 3.3V output eliminates the need for external resistor dividers, simplifying design and reducing component count.
Technically, the LD39015M33R is built on a CMOS process, which contributes to its low quiescent current and low dropout performance. The internal bandgap reference provides a stable 3.3V output with an accuracy of ±2% over the full operating temperature range of -40°C to +125°C. The device is stable with ceramic output capacitors as low as 1uF, allowing for compact and cost-effective designs. The SOT-23-5 package has a thermal resistance (theta_JA) of approximately 250°C/W, which must be considered for power dissipation in high-temperature environments.
Typical applications include powering low-power microcontrollers, wireless modules (such as Bluetooth Low Energy and Zigbee), MEMS sensors, and other analog/RF circuits that require a clean, stable 3.3V supply. The ultra-low noise and high PSRR make it particularly suitable for noise-sensitive applications like audio codecs and RF transceivers, where supply noise can degrade performance.
When designing with the LD39015M33R, ensure that the input voltage remains above the dropout voltage plus the output voltage (3.3V + 100mV = 3.4V) to maintain regulation. Place a 1uF ceramic capacitor on the input and output as close to the pins as possible. The enable pin (EN) can be used for power sequencing; it is active-high and has an internal pull-down, so it can be left floating to disable the output.
ドロップイン代替品: LD39015M33R — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
クイック比較ツール — 並列比較する代替部品を選択:
LD39015M28R
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
LD39015M18R
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
TLV70033
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
AP2127K-3.3
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
MIC5205-3.3YM5
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
LD39015M33R 最大定格＆電気的特性
| 出力タイプ | Fixed |
| 出力電圧 | 3.3 V |
| 最大出力電流 | 150 mA |
| 入力電圧範囲 | 1.5 V to 5.5 V |
| ドロップアウト電圧 | 100 mV at 150 mA |
| 出力ノイズ | 30 uVrms (10 Hz to 100 kHz) |
| PSRR | 60 dB at 1 kHz |
| 静止電流 | 40 uA |
| Output Voltage Accuracy | ±2% |
| 動作温度 | -40°C to +125°C |
| パッケージ | SOT-23-5 |
| 実装タイプ | Surface Mount |
| イネーブルピン | Yes (active-high) |
| 熱シャットダウン | Yes |
| 電流制限 | Yes |
| RoHS ステータス | Compliant |
LD39015M33R ピン構成
| ピン 1 | IN — Input voltage supply |
| ピン 2 | GND — Ground |
| ピン 3 | EN — Enable (active high) |
| ピン 4 | NC — No connect |
| ピン 5 | OUT — Regulated output voltage |
主な用途
LD39015M33R の用途: 6 件s: Battery-Powered IoT Devices, Portable Audio Players, Wireless Modules (BLE/Zigbee), MEMS Sensor Power, Industrial Control Systems, Medical Monitoring Devices.
Battery-Powered IoT Devices
The LD39015M33R is ideal for battery-powered IoT devices such as wireless sensors and beacons. Its low quiescent current of 40uA extends battery life, while the 3.3V output is compatible with common microcontrollers and wireless modules. The low dropout voltage of 100mV allows operation down to 3.4V input, maximizing usable battery capacity. In a typical IoT node, the LDO is placed between the battery (e.g., a CR2032 coin cell) and the system load, with a 1uF ceramic capacitor on the input and output. The enable pin can be used to power down the regulator in sleep mode, further reducing power consumption. Compared to a switching regulator, the LDO offers simplicity and low noise, which is critical for RF modules that are sensitive to supply ripple.
おすすめ
Portable Audio Players
The LD39015M33R provides a clean 3.3V supply for audio codecs and amplifiers in portable audio players. Its ultra-low output noise of 30uVrms and PSRR of 60dB at 1kHz ensure that supply noise does not degrade the audio signal-to-noise ratio. In a typical audio player, the LDO is used to power the DAC and headphone amplifier, with the input connected to the battery or a 5V boost converter. A 1uF ceramic output capacitor is sufficient for stability. The low quiescent current helps extend playback time. While a switching regulator could be more efficient, the LDO's low noise is essential for high-fidelity audio, making the LD39015M33R a preferred choice for noise-sensitive audio paths.
おすすめ
Wireless Modules (BLE/Zigbee)
The LD39015M33R is well-suited for powering Bluetooth Low Energy (BLE) and Zigbee modules, which require a stable 3.3V supply with low noise to maintain RF performance. The LDO's high PSRR of 60dB at 1kHz attenuates ripple from the battery or DC-DC converter, preventing interference with the RF transceiver. In a typical module design, the LDO is placed between the main supply rail and the module's VCC pin, with decoupling capacitors on both input and output. The enable pin allows the host MCU to power down the module in sleep mode, reducing overall system power consumption. The low dropout voltage ensures the module operates even when the battery voltage drops close to 3.4V.
おすすめ
MEMS Sensor Power
The LD39015M33R provides a clean, stable 3.3V supply for MEMS sensors such as accelerometers, gyroscopes, and pressure sensors. These sensors often have analog outputs that are sensitive to supply noise, which can affect measurement accuracy. The LDO's low output noise of 30uVrms and high PSRR ensure a quiet supply, improving sensor performance. In a typical sensor module, the LDO is powered from a battery or a 5V rail, with a 1uF ceramic capacitor on the output. The small SOT-23-5 package is ideal for compact sensor nodes. The enable pin can be used to power down the sensor in low-power modes, reducing overall system current draw.
おすすめ
Industrial Control Systems
The LD39015M33R is suitable for industrial control systems that require a reliable 3.3V supply for microcontrollers, sensors, and communication interfaces. Its wide operating temperature range of -40°C to +125°C ensures reliable operation in harsh industrial environments. The LDO's internal current limiting and thermal shutdown protect the system from overcurrent and overtemperature faults. In a typical industrial application, the LDO is powered from a 24V bus via a buck converter, providing a clean 3.3V rail for logic circuits. The low dropout voltage and low quiescent current are beneficial for always-on monitoring circuits. The SOT-23-5 package is easy to integrate into existing PCB designs.
おすすめ
Medical Monitoring Devices
The LD39015M33R is used in medical monitoring devices such as wearable health trackers and portable patient monitors, where a stable and low-noise 3.3V supply is critical for accurate sensor readings. The LDO's ultra-low noise of 30uVrms prevents interference with sensitive analog front-ends, such as ECG and PPG sensors. In a typical wearable device, the LDO is powered from a lithium-ion battery, with a 1uF ceramic output capacitor. The low quiescent current of 40uA extends battery life, which is essential for continuous monitoring. The enable pin allows the device to enter a low-power sleep mode when not actively measuring. The compact SOT-23-5 package fits well in space-constrained wearable designs.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: LD39015M33R — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | LD39015M28R | TLV70033 | AP2127K-3.3 | MIC5205-3.3YM5 |
|---|---|---|---|---|---|
| Package | SOT-23-5 | SOT-23-5 - same | SOT-23-5 - same | SOT-23-5 - same | SOT-23-5 - same |
| Brand | STMicroelectronics | STMicroelectronics | Texas Instruments | Diodes Incorporated | Microchip Technology |
| Output Voltage | 3.3V | 2.8V | 3.3V | 3.3V | 3.3V |
| Maximum Output Current | 150mA | 150mA | 200mA | 300mA | 150mA |
| Dropout Voltage | 100mV at 150mA | 100mV at 150mA | 200mV at 200mA | 300mV at 300mA | 165mV at 150mA |
| Output Noise | 30uVrms | 30uVrms | 40uVrms | 50uVrms | 26uVrms |
| PSRR at 1kHz | 60dB | 60dB | 65dB | 55dB | 70dB |
| Quiescent Current | 40uA | 40uA | 31uA | 50uA | 80uA |
主な差別化要因
- Ultra-low output noise of 30uVrms （vs TLV70033)
- Low quiescent current of 40uA （vs MIC5205-3.3YM5)
- Low dropout voltage of 100mV （vs AP2127K-3.3)
設計ノート
Place a 1uF ceramic capacitor on the input and output as close to the pins as possible. The LD39015M33R is stable with ceramic output capacitors as low as 1uF. For optimal transient response, a 2.2uF output capacitor is recommended. Ensure the ground pin is connected to a solid ground plane to minimize noise.
The SOT-23-5 package has a thermal resistance (theta_JA) of approximately 250°C/W. At maximum output current of 150mA and a typical dropout of 100mV, power dissipation is only 15mW, resulting in a negligible temperature rise. However, in high ambient temperature environments, ensure that the junction temperature does not exceed 125°C. For higher power dissipation, consider using a larger copper area on the PCB to improve heat dissipation.
Do not exceed the input voltage range of 5.5V. The enable pin has an internal pull-down, so if left floating, the regulator will be disabled. Ensure the EN pin is driven high (above 0.9V) to enable the output. Avoid using the NC pin for routing; it is not connected internally and should be left unconnected or tied to ground.
コンプライアンス情報
RoHS compliant per STMicroelectronics product page. Not AEC-Q100 qualified. Halogen-free status not specified in available data.
