LT3045HMSE#Z-EP - 500mA 20V Ultra-Low Noise LDO | ADI
MPN： LT3045HMSE#Z-EP ✓ 啟用中LT3045HMSE#Z-EP 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 very close to the output voltage. Within the broader system hierarchy, the LT3045HMSE#Z-EP sits as LDO -> linear regulator -> voltage regulator -> power management IC -> semiconductor. Unlike switching regulators, LDOs trade efficiency for the absence of switching ripple, making them the preferred post-regulator for noise-sensitive analog blocks.
Key features include 0.8 uVrms output noise (10 Hz to 100 kHz), 75 dB PSRR at 1 MHz, and 2.2 mA quiescent current. The part also integrates reverse-battery protection, reverse-current protection, internal current limit with foldback, and thermal limit with hysteresis. The exposed pad MSOP-12 keeps theta_JA low for reliable operation at elevated ambient temperatures in ruggedized environments.
Architecturally, the LT3045 uses a precision current-source reference followed by a high-gain unity-gain output stage, producing noise performance that is essentially independent of output voltage and load current. Its wideband PSRR allows the part to clean up switching-converter residuals in multi-rail systems, eliminating the need for additional LC filters.
Typical applications include RF and microwave power rails, military/aerospace avionics, precision data-converter power supplies, and post-regulation for switching converters. The 0 V minimum output enables biasing of negative-rail op-amps or biased negative references when combined with an external charge pump.
When designing with the LT3045HMSE#Z-EP, ensure the exposed pad is soldered to at least 1 sq-in of copper to keep junction temperature in range, and place the 10 uF minimum ceramic output capacitor directly at the OUT pins. The -EP suffix designates Enhanced Product flow for AQEC and defense applications; for industrial/consumer designs, use the standard LT3045HMSE#PBF part number.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
直接替換替代品，適用於 LT3045HMSE#Z-EP — 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： LT3045HMSE#Z-EP （相同外形與佔位） — 差異在於 Dropout Voltage, Operating Temperature, PSRR, Package, Quiescent Current.
LT3045HMSE#PBF
✅ 直接替換聯絡詢價
查看資料表 →LT3045IMSE#PBF
✅ 直接替換📋 參考替代品（不在目錄中）
LT3045EMSE#TRPBF
✅ 直接替換📋 參考替代品（不在目錄中）
LT3045EDD#PBF
✅ 直接替換📋 參考替代品（不在目錄中）
LT3042EDD#PBF
✅ 直接替換📋 參考替代品（不在目錄中）
LT3045HMSE#Z-EP 最大額定值與電氣特性
| Manufacturer | Analog Devices |
| MPN | LT3045HMSE#Z-EP |
| Series | LT3045-EP (Enhanced Product / AQEC) |
| Product Type | LDO Linear Voltage Regulator |
| 輸出類型 | Adjustable (positive) |
| 輸出數量 | 1 |
| 輸出電壓範圍 | 0 V to 15 V |
| 最大輸出電流 | 500 mA |
| 輸入電壓範圍 | 1.8 V to 20 V |
| 壓降電壓 | 260 mV (typ at 500 mA) |
| 輸出雜訊 | 0.8 uVrms (10 Hz to 100 kHz) |
| PSRR | 75 dB at 1 MHz |
| 靜態電流 | 2.2 mA (typ) |
| Minimum Output Capacitor | 10 uF ceramic |
| 封裝 | 12-lead MSOP-EP (MSE), thermally enhanced |
| 安裝類型 | Surface Mount |
| 工作溫度 | -40 C to +150 C (junction) |
| Protection Features | Reverse-battery, reverse-current, internal current limit with foldback, thermal limit with hysteresis |
| Qualification | Enhanced Product (EP), AQEC, defense/aerospace |
LT3045HMSE#Z-EP 腳位配置
| 腳位 1 | OUT — Regulated output voltage |
| 腳位 2 | OUT — Regulated output voltage |
| 腳位 3 | SET — Output voltage programming (resistor divider to ground) |
| 腳位 4 | IN — Input supply voltage |
| 腳位 5 | IN — Input supply voltage |
| 腳位 6 | EN/UVLO — Enable / undervoltage lockout input |
| 腳位 7 | NC — Not connected (per datasheet) |
| 腳位 8 | PG — Power good indicator output |
| 腳位 9 | GND — Ground reference |
| 腳位 10 | GND — Ground reference |
| 腳位 11 | ILIM — Current limit programming (resistor to ground) |
| 腳位 12 | SENSE — Output voltage sense for regulation feedback |
典型應用
LT3045HMSE#Z-EP 適用於 6 應用s: RF and Microwave Power Rails, Defense and Aerospace Avionics, Precision Data-Converter Power, Switching-Converter Post-Filter, Test and Measurement Instrumentation, Industrial Process Control.
RF and Microwave Power Rails
The LT3045HMSE#Z-EP's 0.8 uVrms output noise and 75 dB PSRR at 1 MHz make it an excellent choice for powering RF VCOs, PLLs, mixers, and LNAs. The 500 mA output current supports multi-stage receiver chains while the ultra-low noise prevents reciprocal mixing and phase-noise degradation in narrowband radios. Place the LDO downstream of a switching pre-regulator; the part's wideband PSRR cleans residuals that would otherwise appear on the LO. The MSOP-12-EP package keeps the part compact for dense RF front-end boards used in defense transceivers.
推薦
Defense and Aerospace Avionics
The LT3045HMSE#Z-EP's Enhanced Product (EP) flow and AQEC qualification make it suitable for defense and aerospace avionics power systems. The 20 V maximum input withstands 28 V transient spikes common in military vehicle buses, while the 0 V to 15 V adjustable output supports legacy +12 V and +15 V avionics rails. The MSOP-12-EP package's exposed pad provides thermal headroom at high altitude where convective cooling is reduced, and the EP reliability flow provides traceability and documentation for mission-critical programs.
推薦
Precision Data-Converter Power
High-resolution ADCs and DACs require power rails that do not inject noise into the analog signal path. The LT3045HMSE#Z-EP delivers 0.8 uVrms output noise from 10 Hz to 100 kHz, which is below the quantization noise floor of many 16-bit and 18-bit converters. The 75 dB PSRR at 1 MHz rejects residual ripple from upstream switching converters when the design uses a multi-stage power architecture. The 0 V minimum output enables precise reference-ground biasing for instrumentation-grade measurement systems used in defense applications.
推薦
Switching-Converter Post-Filter
Place the LT3045HMSE#Z-EP downstream of a switching buck or boost converter to produce a clean, low-noise output rail. The part's 75 dB PSRR at 1 MHz suppresses switching ripple that would otherwise reach sensitive analog blocks, eliminating the need for additional LC filter stages. The 500 mA current capability handles moderate-load analog subsystems, while the 260 mV typical dropout allows tight headroom budgeting in compact designs. This architecture is widely used in portable test equipment and field-deployed instruments.
推薦
Test and Measurement Instrumentation
Bench-top and field-portable test instruments demand clean, stable supply rails that do not contaminate measurements of small analog signals. The LT3045HMSE#Z-EP delivers 0.8 uVrms output noise and 75 dB PSRR at 1 MHz, ensuring that supply noise does not couple into high-impedance signal paths. The adjustable output from 0 V to 15 V supports the wide range of analog rails common in mixed-signal test platforms. The MSOP-12-EP package allows dense placement near the analog front-end for minimal PCB-area-tracking noise pickup.
推薦
Industrial Process Control
Industrial process control systems operate in electrically noisy environments where supply regulation must reject motor-drive transients and switching noise. The LT3045HMSE#Z-EP provides 75 dB PSRR at 1 MHz and full reverse-battery and reverse-current protection, suiting it to 24 V industrial bus rails. The 0 V minimum output supports legacy 0.16 V loop powered instrumentation when used with an external boost or charge pump. The exposed-pad MSOP-12 package handles continuous power dissipation in factory-floor equipment with elevated ambient temperatures.
推薦
推薦產品摘要
工程參考資料，適用於 LT3045HMSE#Z-EP — 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 | LT3045HMSE#PBF | LT3045IMSE#PBF | LT3045EMSE#TRPBF |
|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 12-MSOP-EP (MSE) | 12-MSOP-EP (MSE) - same | 12-MSOP-EP (MSE) - same | 12-MSOP-EP (MSE) - same |
| Output Current | 500 mA | 500 mA | 500 mA | 500 mA |
| Output Voltage Range | 0 V to 15 V | 0 V to 15 V | 0 V to 15 V | 0 V to 15 V |
| Output Noise | 0.8 uVrms | 0.8 uVrms | 0.8 uVrms | 0.8 uVrms |
| PSRR at 1 MHz | 75 dB | 75 dB | 75 dB | 75 dB |
| Qualification | EP / AQEC (defense/aerospace) | Standard commercial | Industrial grade | E-grade commercial |
| Temperature Grade | EP / defense (-40C to +150C junction) | Standard commercial | Industrial (-40C to +125C) | Extended commercial |
主要差異化特點
- Enhanced Product (EP) / AQEC qualification for defense and aerospace (對比LT3045HMSE#PBF)
- 0 V minimum output voltage capability (對比LT3045IMSE#PBF)
- Industry-leading wideband PSRR at 1 MHz (對比LT3045EMSE#TRPBF)
設計說明
The MSOP-12-EP package relies on its exposed thermal pad for heat removal. Solder the pad to a copper pour of at least 1 square inch on the top layer, supplemented with thermal vias to inner-layer ground planes. Estimated: at VIN=12 V, VOUT=5 V, and 500 mA load, power dissipation is approximately 3.5 W; without adequate copper the junction temperature will exceed 150 C and trigger thermal shutdown. Keep high-current traces wide to reduce copper losses.
Place the 10 uF minimum ceramic output capacitor as close as possible to the OUT and GND pins. Use X7R or X5R dielectric; the ESR must remain below 50 milliohm across the operating temperature range. Place input capacitors symmetrically to the IN pins to minimize parasitic inductance. The exposed pad connection should use an array of 0.3 mm thermal vias in a 3x3 grid for best heat spreading.
Do not exceed the absolute maximum input voltage of 20 V. The reverse-battery protection circuit can only withstand limited reverse voltage; add an external TVS for full protection in 24 V industrial bus applications. Ensure the SET pin resistor divider uses 1% tolerance or better to maintain output accuracy. The PG (power good) pin is open-drain; do not float it without a pull-up resistor if monitoring is desired.
合規資訊
Compliance details not present in Verified Web Data; refer to manufacturer datasheet RoHS/REACH declaration for definitive values. -EP suffix indicates Enhanced Product / AQEC flow for defense and aerospace applications per Analog Devices Enhanced Product documentation.
