LT3045HMSE#PBF - 500mA Ultra-Low Noise LDO | Analog Devices
MPN: LT3045HMSE#PBF ✓ فعالLT3045HMSE#PBF جائزہ
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. In the system hierarchy, an LDO is a subset of linear regulators, which are themselves a category of voltage regulators within the broader power management IC family. The LT3045 belongs to the ultra-low-noise category designed for noise-sensitive analog/RF loads that cannot tolerate the ripple typical of switching regulators.
Key features include a 260 mV typical dropout voltage at full 500 mA load, 2.2 mA quiescent current that drops to sub-1 µA in shutdown, programmable current limit, and a power-good indicator. The exposed-pad MSOP-12 package achieves a thermal resistance of approximately 33 °C/W, supporting sustained 500 mA operation without external heatsinking at moderate VIN-VOUT differentials.
The LT3045 is architected as a precision current reference with a unity-gain amplifier on the output. This unique topology delivers constant output noise, PSRR, bandwidth, and load regulation independent of the programmed output voltage - a key advantage over conventional series-pass LDOs whose noise and bandwidth scale with VOUT.
Typical applications include RF PLL/VCO power supplies, high-speed data converter references, precision instrumentation front-ends, medical imaging, and post-regulation after switching converters. Designers favor the LT3045 wherever sub-1 µVrms noise is required without the switching artifacts of a buck regulator.
When designing with the LT3045, treat the exposed pad as the primary thermal path and provide at least 1 cm² of copper pour to keep junction temperature below 125 °C. Use a minimum 10 µF X7R input/output capacitor to maintain stability and PSRR; ESR must stay below 50 mΩ.
This page synthesizes distributor pricing, drop-in same-package alternatives, and practical thermal/PCB design notes not found in the standalone Analog Devices datasheet, helping engineers shorten the BOM selection and PCB bring-up cycle.
کے لیے ڈراپ اِن متبادل LT3045HMSE#PBF — یکساں پیکیج، پن سے پن مطابقت پذیر۔ مختلف پیکیج والے پرزے جن کے لیے PCB دوبارہ کام درکار ہو، شامل نہیں ہیں۔
اس سیریز میں مختلف ورژن
اسی سیریز کے ماڈلز جو ڈراپ اِن مطابقت رکھتے ہیں LT3045HMSE#PBF (یکساں فارم فیکٹر اور فٹ پرنٹ) — میں مختلف Package, Input Voltage Range, Dropout Voltage, Operating Temperature, PSRR.
LT3045IMSE#PBF
✅ ڈراپ-اِن📋 حوالہ جاتی متبادل (کیٹلاگ میں نہیں)
LT3045HMSE#TRPBF
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →LT3045HMSE#WPBF
✅ ڈراپ-اِن📋 حوالہ جاتی متبادل (کیٹلاگ میں نہیں)
LT3042EMSE#PBF
✅ ڈراپ-اِن📋 حوالہ جاتی متبادل (کیٹلاگ میں نہیں)
LT3045EDD#PBF
✅ ڈراپ-اِن📋 حوالہ جاتی متبادل (کیٹلاگ میں نہیں)
LT3045HMSE#PBF زیادہ سے زیادہ ریٹنگز اور برقی خصوصیات
| آؤٹ پٹ کی قسم | Adjustable (positive) |
| آؤٹ پٹ وولٹیج کی حد | 0 V to 15 V |
| زیادہ سے زیادہ آؤٹ پٹ کرنٹ | 500 mA |
| اِن پٹ وولٹیج رینج | 1.8 V to 20 V |
| ڈراپ آؤٹ وولٹیج | 260 mV typical at 500 mA |
| آؤٹ پٹ شور | 0.8 uVrms (10 Hz to 100 kHz) |
| PSRR | 76 dB at 1 kHz |
| کوئیسینٹ کرنٹ | 2.2 mA typical |
| شٹ ڈاؤن کرنٹ | < 1 µA |
| آپریٹنگ درجہ حرارت | -40 °C to +125 °C |
| پیکیج | 12-pin MSOP-EP (MSE) |
| ماؤنٹنگ ٹائپ | Surface Mount |
| MSL لیول | 1 (unlimited) |
| RoHS اسٹیٹس | Compliant |
| این ایبل پن | Yes (active-high SHDN) |
LT3045HMSE#PBF پن کنفیگریشن
| پن 1 | IN — Input supply voltage |
| پن 2 | IN — Input supply voltage (tie to pin 1) |
| پن 3 | SHDN — Active-high shutdown/enable input |
| پن 4 | PGOOD — Power-good indicator output |
| پن 5 | ILIM — Current limit programming |
| پن 6 | GND — Signal ground |
| پن 7 | SET — Output voltage programming input |
| پن 8 | OUT — Regulated output voltage |
| پن 9 | OUT — Regulated output voltage (tie to pin 8) |
| پن 10 | NC — Not connected (per datasheet) |
| پن 11 | NC — Not connected (per datasheet) |
| پن 12 | NC — Not connected (per datasheet) |
عام استعمالات
LT3045HMSE#PBF کے لیے موزوں ہے 6 ایپلیکیشنs: RF PLL/VCO Power Supply, High-Speed ADC/DAC Reference Power, Precision Instrumentation Front-End, Medical Imaging Equipment, Post-Regulation After Switching Converters, Audio DAC and Studio Equipment.
RF PLL/VCO Power Supply
The LT3045HMSE#PBF delivers 500mA at 0.8 uVrms noise and 76 dB PSRR at 1 kHz, making it ideal for powering RF PLL and VCO circuits where supply noise directly translates into phase noise and degraded EVM. Placed between a switching pre-regulator and the PLL/VCO AVDD rail, it suppresses switching ripple by more than 70 dB at audio frequencies. The wide 20 V input range lets it post-regulate from a 12 V or 15 V system rail down to the 3.3 V PLL supply without thermal stress. Compared to a buck regulator alone, the LT3045 eliminates switching spurs from contaminating the synthesizer output.
تجویز کردہ
High-Speed ADC/DAC Reference Power
The LT3045HMSE#PBF's 0.8 uVrms output noise floor and 76 dB PSRR at 1 kHz make it the preferred post-regulator for high-resolution SAR and pipeline ADCs whose SNR is degraded by supply noise. Driving a 16-bit ADC reference from the LT3045's unity-gain output buffer preserves conversion linearity across the full input range. The 500 mA capacity supports reference buffers driving multiple ADCs in parallel. The 0 V to 15 V adjustable output covers unipolar and bipolar reference voltages from a single IC, simplifying BOM versus discrete reference + buffer chains.
تجویز کردہ
Precision Instrumentation Front-End
The LT3045HMSE#PBF powers the analog front-end of precision instrumentation - including weigh scales, strain-gauge amplifiers, and electrochemical sensor signal chains - where 0.8 uVrms noise is below the sensor's own noise floor. The unity-gain buffer topology maintains constant noise and bandwidth from 0 V to 15 V, allowing the same part to power both low-voltage op-amps and higher-voltage excitation rails. The sub-1 µA shutdown current extends battery life in portable instrumentation that sleeps between measurements, while the 500 mA capability supports lab-bench multi-channel designs.
تجویز کردہ
Medical Imaging Equipment
The LT3045HMSE#PBF's 0.8 uVrms noise and high PSRR are critical for ultrasound transducer bias, MRI gradient-driver analog rails, and patient-monitoring front-ends where supply noise directly couples into diagnostic accuracy. The 12-pin MSOP-EP package fits compact handheld ultrasound probes while delivering 500 mA for multi-channel beamformer ASICs. Its wide 0 V to 15 V output range supports both low-voltage FPGA rails and higher-voltage analog front-end supplies from a single LDO, reducing board area and BOM count in cost-sensitive medical designs.
تجویز کردہ
Post-Regulation After Switching Converters
The LT3045HMSE#PBF is widely deployed as a post-regulator after a switching buck or buck-boost converter to clean up switching ripple without sacrificing conversion efficiency. At 20 V input tolerance, it accepts outputs from common 12 V and 15 V intermediate rails, and its 260 mV dropout keeps power dissipation manageable even when the post-regulated rail is close to the buck output. The unity-gain architecture maintains 76 dB PSRR across all output voltages, eliminating the VOUT-dependent PSRR degradation seen in conventional LDOs and enabling single-part reuse across multiple rails.
تجویز کردہ
Audio DAC and Studio Equipment
The LT3045HMSE#PBF powers professional audio DACs and studio pre-amplifiers where 0.8 uVrms noise is far below the audible threshold and well under the DAC's own noise floor. Its high PSRR cleans residual switching ripple from upstream USB-PD or PoE rails, eliminating audible buzz in headphone amplifiers. The wide 0 V to 15 V output range covers both ±15 V op-amp rails and single-supply DAC AVDD pins from one IC, simplifying power architecture in mixing consoles. Sub-1 µA shutdown current preserves battery life in portable field recorders that idle between takes.
تجویز کردہ
تجویز کردہ پروڈکٹس کا خلاصہ
کے لیے انجینئرنگ ریفرنس ڈیٹا LT3045HMSE#PBF — موازنہ، ڈیزائن رہنمائی، اور تعمیل کی معلومات۔
انتخاب کی گائیڈ
متبادلات کے ساتھ موازنہ
| پیرامیٹر | یہ پروڈکٹ | LT3045IMSE#PBF | LT3045HMSE#TRPBF | LT3045HMSE#WPBF | LT3042EMSE#PBF |
|---|---|---|---|---|---|
| Package | 12-pin MSOP-EP (MSE) | 12-pin MSOP-EP (MSE) - same | 12-pin MSOP-EP (MSE) - same | 12-pin MSOP-EP (MSE) - same | 12-pin MSOP-EP (MSE) - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Output Current | 500 mA | 500 mA | 500 mA | 500 mA | 200 mA (-60%) |
| Input Voltage Range | 1.8 V to 20 V | 1.8 V to 20 V | 1.8 V to 20 V | 1.8 V to 20 V | 1.8 V to 20 V |
| Output Noise | 0.8 uVrms | 0.8 uVrms | 0.8 uVrms | 0.8 uVrms | 0.8 uVrms |
| PSRR (1 kHz) | 76 dB | 76 dB | 76 dB | 76 dB | 76 dB |
| Output Voltage Range | 0 V to 15 V | 0 V to 15 V | 0 V to 15 V | 0 V to 15 V | 0 V to 15 V |
| Grade / AEC-Q100 | H (high-grade) | I (industrial) | H (high-grade) | W (AEC-Q100 automotive) | E (extended) |
| Packaging | Tube (#PBF) | Tube | Tape & Reel | Tube (automotive) | Tube |
اہم امتیازی خصوصیات
- Wide output voltage range with constant noise/PSRR (بمقابلہLT3042EMSE#PBF)
- Single-package automotive grade option (بمقابلہLT3045HMSE#PBF)
- Higher input voltage tolerance than competing LDOs (بمقابلہTPS7A4701 (TI VQFN-20))
ڈیزائن نوٹس
The 12-pin MSOP-EP package relies on the exposed pad as the primary thermal path. Estimated: at VIN=5.5V, VOUT=5.0V, and 500mA load, power dissipation is approximately 0.25W. With junction-to-ambient thermal resistance around 33 °C/W on a 1 cm² copper pour, junction temperature rise is approximately 8 °C above ambient - well within the 125 °C limit. For higher VIN-VOUT deltas (e.g., 12V to 3.3V at 500mA = 4.35W dissipated), increase the PCB copper area to at least 4 cm² or add a topside thermal copper pour connected to the exposed pad to keep junction temperature below 100 °C.
Place input and output capacitors as close as possible to the IN and OUT pins respectively. Use a minimum 10 µF X7R ceramic capacitor on the input and a minimum 10 µF X7R on the output to maintain stability and PSRR. Keep capacitor ESR below 50 mΩ across all operating conditions. Connect IN pins 1 and 2 together, and OUT pins 8 and 9 together, using wide copper pours to minimize parasitic resistance. The exposed pad must be soldered to a continuous ground plane with multiple thermal vias.
Do not float the SHDN pin - tie it to IN through a 100 kΩ resistor if not actively driven, otherwise the LDO remains in an undefined state. The PGOOD pin is open-drain and requires an external pull-up resistor (typically 100 kΩ to OUT). Do not exceed 20 V on the IN pin even momentarily - the absolute maximum rating is 20 V. The SET pin is high-impedance and must be protected from contamination; use a guarded routing pattern and minimize trace length to prevent leakage-induced output voltage error.
تعمیل کی معلومات
RoHS and REACH compliant per #PBF suffix designation. Standard part is not AEC-Q100 qualified - choose LT3045HMSE#WPBF for automotive applications. Halogen-free status not explicitly listed in retrieved web data.
