LD39030DTPU33R - 3.3V 300mA Ultra-Low Noise LDO | STMicroelectronics
料号： LD39030DTPU33R ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 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 |
LD39030DTPU33R 概述
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, LDOs use a pass transistor with a low saturation voltage, allowing them to operate with a small input-to-output voltage differential. In the system hierarchy, an LDO is a specific type of linear regulator, which is a category of voltage regulator, which in turn is a key component in power management ICs. LDOs are widely used in portable electronics, audio equipment, and RF circuits where low noise and fast transient response are critical.
Key features of the LD39030DTPU33R include an ultra-low output noise of 10 uVrms (typical) over a 10 Hz to 100 kHz bandwidth, a high PSRR of 70 dB at 1 kHz, and a low dropout voltage of 120 mV at 300mA load. The quiescent current is only 40 uA, which is ideal for battery-powered applications. The device also includes an enable pin for power sequencing, short-circuit protection, and thermal shutdown. The UDFN-6 package (2mm x 2mm) offers a compact footprint with a thermal resistance of 90 C/W, enabling space-constrained designs.
The LD39030DTPU33R uses a CMOS architecture with a precision bandgap reference, achieving excellent line and load regulation. The high PSRR minimizes ripple from upstream switching converters, making it suitable for noise-sensitive analog and RF signal chains. The low quiescent current extends battery life in portable devices, while the enable pin allows for efficient power management in multi-rail systems.
Typical applications include audio codec power supplies, RF transceiver power rails, sensor interfaces, and portable medical devices. The wide input range and low dropout voltage also support operation from single-cell Li-ion batteries (3.0V to 4.2V) with adequate headroom.
When designing with this device, ensure adequate input-to-output voltage headroom to maintain regulation under all load conditions. The enable pin allows sequential power-up in multi-rail systems, which is essential for processors requiring specific rail sequencing. Place input and output capacitors close to the pins for optimal stability and noise performance.
直接替换替代料： LD39030DTPU33R ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
LD39030DTPU33R-Q1
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
LD39030DTPU28R
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
LD39030DTPU18R
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
TPS7A2033PDSNR
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
NCP700B33T2G
⚡ 相同封装 ⚠️ 规格未核验📋 参考替代料（不在目录中）
LD39030DTPU33R 最大额定值与电气特性
| 输出类型 | Fixed |
| 输出电压 | 3.3 V |
| 最大输出电流 | 300 mA |
| 输入电压范围 | 1.5 V to 5.5 V |
| 压差电压 | 120 mV at 300 mA |
| 输出噪声 | 10 uVrms (10 Hz to 100 kHz) |
| PSRR | 70 dB at 1 kHz |
| 静态电流 | 40 uA |
| Line Regulation | 0.01 %/V |
| Load Regulation | 0.01 %/mA |
| 热阻 | 90 C/W |
| 工作温度 | -40C to +125C |
| 封装 | UDFN-6 (2x2 mm) |
| 安装类型 | Surface Mount |
| MSL 等级 | 1 (unlimited) |
| RoHS 状态 | Compliant |
| 使能引脚 | Yes (active-high) |
LD39030DTPU33R 引脚配置
| 引脚 1 | IN — Input supply voltage |
| 引脚 2 | GND — Ground |
| 引脚 3 | EN — Enable (active high) |
| 引脚 4 | NC — No connect |
| 引脚 5 | OUT — Regulated output voltage |
| 引脚 6 | NC — No connect |
典型应用
LD39030DTPU33R 适用于 6 应用s: Audio Codec Power Supply, RF Transceiver Power Rail, Portable Medical Devices, IoT Sensor Nodes, Battery-Powered Wearables, Industrial Sensor Interfaces.
Audio Codec Power Supply
The LD39030DTPU33R provides a clean 3.3V rail for audio codecs, with 10 uVrms noise and 70 dB PSRR ensuring minimal audio interference. In a typical audio codec application, the LDO is placed between the system 5V rail and the codec's AVDD pin, with a 1uF ceramic capacitor on input and output. The low noise floor preserves the dynamic range of the audio signal, while the high PSRR rejects ripple from switching regulators. Compared to switching regulators, the LDO eliminates switching noise but dissipates more power; for a 5V-to-3.3V conversion at 100mA, power dissipation is 170mW, which is acceptable for most portable devices.
推荐
RF Transceiver Power Rail
The LD39030DTPU33R is ideal for powering RF transceivers, where noise on the supply can degrade signal integrity. Its 10 uVrms noise and 70 dB PSRR at 1 kHz ensure a clean power rail for VCOs and PLLs. In a typical RF application, the LDO is placed close to the transceiver's power pin, with a 0.1uF capacitor for high-frequency bypass. The low quiescent current of 40 uA extends battery life in portable RF devices. The enable pin allows the RF section to be powered down during standby, reducing overall power consumption.
推荐
Portable Medical Devices
The LD39030DTPU33R is suitable for portable medical devices such as glucose monitors and pulse oximeters, where low power and low noise are critical. The 40 uA quiescent current extends battery life, while the 10 uVrms noise ensures accurate sensor readings. In a typical medical device, the LDO regulates the battery voltage to 3.3V for the microcontroller and sensor interface. The small UDFN-6 package saves board space, and the wide operating temperature range (-40C to +125C) ensures reliable operation in various environments.
推荐
IoT Sensor Nodes
The LD39030DTPU33R is well-suited for IoT sensor nodes that require a stable 3.3V supply from a battery or energy harvester. The low dropout voltage of 120 mV allows operation from a nearly discharged battery, maximizing usable capacity. The enable pin enables duty-cycling to reduce average power consumption. In a typical IoT node, the LDO powers a microcontroller, sensor, and wireless module. The low quiescent current is essential for long battery life, and the compact package fits into small form factors.
推荐
Battery-Powered Wearables
The LD39030DTPU33R is ideal for wearables like smartwatches and fitness trackers, where space and power are at a premium. The UDFN-6 package (2x2 mm) is one of the smallest available for a 300mA LDO, and the 40 uA quiescent current extends battery life. The low dropout voltage ensures efficient operation from a Li-ion battery. In a typical wearable, the LDO provides a clean 3.3V rail for the application processor and sensors. The enable pin allows power gating of peripheral blocks to save energy.
推荐
Industrial Sensor Interfaces
The LD39030DTPU33R can be used in industrial sensor interfaces that require a stable 3.3V supply for analog-to-digital converters and signal conditioning circuits. The high PSRR of 70 dB at 1 kHz rejects noise from industrial power lines, ensuring accurate measurements. The wide operating temperature range (-40C to +125C) makes it suitable for harsh environments. In a typical industrial sensor interface, the LDO powers the ADC and op-amps, providing a clean reference rail. The low noise performance is critical for high-resolution measurements.
推荐
推荐产品汇总
工程参考数据： LD39030DTPU33R ——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 | LD39030DTPU33R-Q1 | LD39030DTPU28R | TPS7A2033PDSNR |
|---|---|---|---|---|
| Package | UDFN-6 | UDFN-6 - same | UDFN-6 - same | X2SON-6 - pin-compatible |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | Texas Instruments |
| Output Voltage | 3.3V | 3.3V | 2.8V | 3.3V |
| Output Current | 300mA | 300mA | 300mA | 300mA |
| Dropout Voltage | 120mV | 120mV | 120mV | 150mV |
| Output Noise | 10 uVrms | 10 uVrms | 10 uVrms | 12 uVrms |
| PSRR at 1kHz | 70dB | 70dB | 70dB | 65dB |
| Quiescent Current | 40uA | 40uA | 40uA | 25uA |
| Enable Pin | Yes | Yes | Yes | Yes |
关键差异点
- Ultra-low noise of 10 uVrms （对比 TPS7A2033PDSNR)
- Higher PSRR of 70 dB at 1 kHz （对比 TPS7A2033PDSNR)
- Automotive grade option available （对比 LD39030DTPU28R)
设计说明
Place input and output capacitors as close to the IC pins as possible. Use a 1uF ceramic capacitor on the input and a 1uF ceramic capacitor on the output. Add a 0.1uF ceramic capacitor in parallel for high-frequency noise bypass. The UDFN-6 package has an exposed pad that should be soldered to a ground plane for optimal thermal performance.
At VIN=5V, VOUT=3.3V, and 300mA load, power dissipation is 510mW. With a thermal resistance of 90 C/W (theta_JA), the junction temperature rise is approximately 46C above ambient. For reliable operation at high ambient temperatures, ensure adequate copper area on the PCB to dissipate heat.
Do not exceed the maximum input voltage of 5.5V. Ensure the enable pin is not left floating; tie it to VIN if not used. The output capacitor must have a minimum capacitance of 1uF for stability. Using a capacitor with high ESR can cause oscillation.
合规信息
RoHS compliant per STMicroelectronics product page. Not AEC-Q100 qualified - choose LD39030DTPU33R-Q1 for automotive.
