LT3045HMSE#TRPBF - 20V 500mA Ultra-Low-Noise LDO | Analog Devices
料号： LT3045HMSE#TRPBF ✓ 量产中LT3045HMSE#TRPBF 概述
A low-dropout regulator, or LDO, is a linear voltage regulator that maintains a stable output while operating with relatively little voltage difference between input and output. The LDO category belongs to the broader voltage-regulator and power-management-IC hierarchy. Unlike a switching converter, an LDO does not add switching-frequency magnetic or conduction noise to the signal path, although power dissipation rises as the difference between input and output voltage times load current increases.
The LT3045 uses Linear Technology’s precision current-reference and high-performance voltage-buffer architecture. According to the Analog Devices product page, it combines ultralow output noise with ultrahigh power-supply rejection ratio. The adjustable output supports flexible laboratory and industrial rail generation, while the 500mA current capability covers moderate analog loads. The exposed thermal pad improves heat transfer from the 12-MSOP-EP package when higher dissipation is unavoidable.
The LT3045 is especially useful when a noisy upstream switching converter already supplies the raw power but a downstream circuit requires a substantially cleaner rail. Its low-noise behavior makes it appropriate for RF and analog front ends, low-level measurement systems, audio and instrumentation circuitry, and reference or bias networks. The 20V input rating also permits operation above conventional low-voltage rails when regulator headroom is available.
Because this device is a linear regulator, designers must verify input-to-output headroom at the maximum expected load. At VIN = 20V and VOUT = 5V, a 500mA load produces an estimated 7.5W dissipation before considering margin; use the exposed pad, adequate copper, and thermal analysis. Input and output capacitors should follow the manufacturer’s recommended network and be placed close to their pins.
This page consolidates the verified distributor identity, availability and pricing data, package information, technical use cases, and practical thermal guidance. It is intended to help engineers identify the correct LT3045 ordering code and determine whether its low-noise architecture suits a specific power rail without adding unverified competitor specifications.
直接替换替代料： LT3045HMSE#TRPBF ——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： LT3045HMSE#TRPBF （相同外形与封装尺寸） ——差异在于 Input Voltage Range, Package.
LT3045HMSE#PBF
✅ 直接替换联系询价
查看数据手册 →LT3045HMSE#WTRPBF
✅ 直接替换📋 参考替代料（不在目录中）
LT3045EMSE#TRPBF
✅ 直接替换📋 参考替代料（不在目录中）
LT3045IMSE#TRPBF
✅ 直接替换📋 参考替代料（不在目录中）
LT3045IDD#TRPBF
✅ 直接替换📋 参考替代料（不在目录中）
LT3045HMSE#TRPBF 最大额定值与电气特性
| Regulator Type | Positive adjustable low-dropout linear regulator |
| 输入电压范围 | 0 V to 20 V |
| Output Current | 500mA |
| 输出配置 | 1 output, adjustable |
| Noise Performance | Ultralow noise |
| Power Supply Rejection Ratio | Ultrahigh PSRR |
| Architecture | Precision current reference followed by high-performance voltage buffer |
| 封装 | 12-MSOP exposed pad |
| Package Code | MSE |
| Package Body Material | Plastic/epoxy |
| Terminal Form | Gull wing |
| 安装类型 | Surface mount |
| Number of Terminals | 12 |
| Lead-Free Ordering Code | LT3045HMSE#PBF |
| Tape-and-Reel Ordering Code | LT3045HMSE#TRPBF |
LT3045HMSE#TRPBF plastic/epoxy 引脚配置指南
LT3045HMSE#TRPBF（plastic/epoxy 封装）的引脚配置。 该功率器件具有栅极、漏极和源极端子。对于无极性封装，请参阅制造商数据手册以了解确切的引脚 1 方向和封装尺寸细节。常见应用包括电源设计、电机驱动和负载开关。
暂无详细引脚数据： LT3045HMSE#TRPBF.
请参阅 数据手册 以查看完整引脚配置。
典型应用
LT3045HMSE#TRPBF 适用于 7 应用s: RF and communications analog rails, Precision instrumentation, Audio and low-level signal-chain power, Industrial control and sensor interfaces, Portable and battery-powered equipment, Wide-input industrial bench supply, Precision reference and bias networks.
RF and communications analog rails
The LT3045HMSE#TRPBF is suitable for RF, communications, and low-noise analog rails where the verified 500mA output capability and ultralow-noise, ultrahigh-PSRR architecture help isolate sensitive circuitry from upstream switching ripple. Place it after a noisier regulator or converter and use its precision reference/buffer behavior to establish a local rail. The 12-MSOP exposed pad supports thermal transfer, but designers must keep the input-to-output voltage drop low enough to control dissipation.
推荐
Precision instrumentation
For laboratory and test instrumentation, the LT3045HMSE#TRPBF can provide a clean local supply for amplifiers, references, and measurement front ends. Its 500mA rating is suitable for moderate loads, while the adjustable positive output supports flexible rail planning. The low-noise architecture is valuable when measurement accuracy is limited by supply ripple rather than the input signal itself. Validate the output programming network and capacitor requirements against the official datasheet.
推荐
Audio and low-level signal-chain power
The LT3045HMSE#TRPBF is appropriate for audio and low-level signal-chain power when the design needs a quiet rail rather than the artifacts of another switching stage. Analog Devices describes the LT3045 as ultralow-noise and ultrahigh-PSRR, which can help reduce supply-related disturbance in sensitive analog sections. Because this is a linear regulator, keep the voltage difference and load current within the thermal design budget. Confirm capacitor ESR and stability guidance from the manufacturer documentation.
推荐
Industrial control and sensor interfaces
The LT3045HMSE#TRPBF can support precision industrial control, sensor-interface, and bias rails when the upstream supply is available with adequate headroom. Its verified 20V input rating is compatible with higher-voltage industrial distributions, while the 500mA output supports moderate sensor and control loads. Use the exposed pad as a deliberate thermal feature, connecting it to the PCB ground plane and copper area specified by the final thermal calculation. The part is not a switching converter, so efficiency falls as the dropout voltage increases.
推荐
Portable and battery-powered equipment
The LT3045HMSE#TRPBF can be used in portable and battery-powered equipment for a low-noise post-regulator when the battery voltage remains sufficiently above the desired output. The 500mA capability is useful for moderate analog sections, but battery systems must carefully account for dropout headroom and linear-regulator heat. The 12-MSOP-EP package is compact, yet thermal performance depends on board copper and ambient temperature. Verify start-up, output-voltage limits, and load-transient behavior in the official documentation.
推荐
Wide-input industrial bench supply
The LT3045HMSE#TRPBF is a candidate for a clean auxiliary rail in a 20V-class industrial bench supply. Its verified 20V input capability and 500mA output make it useful for powering sensitive control or analog blocks downstream of a primary converter. The key tradeoff is heat: at 20V input, lower output settings, and substantial current, a linear stage can dissipate several watts. Use the exposed pad, copper pours, and thermal analysis rather than relying on the package outline alone.
推荐
Precision reference and bias networks
The LT3045HMSE#TRPBF can generate a low-noise adjustable rail for reference, bias, and analog support circuits in laboratory and industrial systems. Its precision current-reference followed by voltage-buffer architecture is specifically relevant when supply variation could affect measurement or calibration accuracy. Choose the output network and capacitors according to the official LT3045 guidance, and ensure the load does not exceed the verified 500mA capability. The regulator’s low noise helps, but thermal stability still depends on layout and loading.
推荐
推荐产品汇总
工程参考数据： LT3045HMSE#TRPBF ——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 | LT3045HMSE#PBF | LT3045HMSE#WTRPBF | LT3045EMSE#TRPBF | LT3045IMSE#TRPBF |
|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 12-MSOP exposed pad | 12-MSOP exposed pad | 12-MSOP exposed pad | 12-MSOP exposed pad | 12-MSOP exposed pad |
| Ordering / Packaging | #TRPBF tape-and-reel code | #PBF lead-free ordering code | #WTRPBF related ordering code | #TRPBF ordering code | #TRPBF ordering code |
关键差异点
- Verified 500mA output capability in a compact 12-MSOP exposed-pad package （对比 LT3045HMSE#PBF)
- Ultralow-noise and ultrahigh-PSRR positioning for analog post-regulation （对比 LT3045EMSE#TRPBF)
- Wide 20V-class input capability for industrial and laboratory rails （对比 LT3045IMSE#TRPBF)
- Exposed-pad thermal path in the verified 12-MSOP-EP package （对比 LT3045IDD#TRPBF)
设计说明
Estimated: power dissipation is PD = (VIN - VOUT) × IOUT. At 20V input, 5V output, and 0.5A load, PD is 7.5W. Validate this result against the official LT3045 maximum junction temperature, package power rating, and PCB thermal resistance. Connect the exposed pad to a continuous ground plane with sufficient copper and avoid enclosing it with thermal relief cuts unless the manufacturer permits them.
Place the input and output capacitors close to the regulator pins and follow the exact capacitance, ESR, and stability recommendations in the official LT3045 datasheet. Keep the exposed pad thermally and electrically connected as directed by the package drawing. Route the high-current output path away from sensitive analog inputs and preserve a low-impedance ground return.
Check dropout headroom at the minimum input voltage, maximum load, and highest temperature; the verified 0V-to-20V input rating does not mean that regulation is available throughout that range at every output voltage. Also verify the output-voltage programming limits and the maximum VIN/VOUT combination against the manufacturer’s absolute-maximum and operating tables before fabrication.
Do not assume that a similarly named LT3045 order code is automatically a drop-in replacement. The supplied cross-reference results include packaging variants and package/case differences. For any substitute, compare the actual footprint, pin numbers, exposed-pad connection, output programming method, current limit, thermal limits, and capacitor requirements rather than relying only on the family name.
合规信息
The supplied verified snippets identify the product and related ordering codes but do not provide explicit RoHS, REACH, halogen-free, conflict-minerals, or automotive qualification declarations. The part is a linear regulator rather than an AEC-Q100-qualified automotive device designation in the supplied data.
