LT1761ES5-3.3 - 100mA, 3.3V LDO Micropower Regulator | Analog Devices
部品番号: LT1761ES5-3.3 ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $2.45 | $2.45 |
| 10 | $2.2 | $22.00 |
| 100 | $1.95 | $195.00 |
| 500 | $1.75 | $875.00 |
| 1,000 | $1.55 | $1,550.00 |
| 2,500 | $1.4 | $3,500.00 |
LT1761ES5-3.3 概要
An LDO (Low-Dropout) linear regulator is a type of linear voltage regulator that maintains a stable output voltage even when the input voltage is only marginally higher than the output. Within the broader hierarchy, an LDO is a subcategory of linear regulators, which themselves are a subcategory of voltage regulators, themselves part of the power management integrated circuit (PMIC) family. LDOs are favored in noise-sensitive applications because they do not introduce switching ripple into the output rail, unlike DC-DC converters.
Key features of the LT1761ES5-3.3 include a wide 1.8 V to 20 V input range, ±1% output voltage accuracy (over line, load, and temperature), internal protection circuitry (reverse-battery, reverse-current, current limit, and thermal shutdown), and a logic-controlled SHDN pin. With a 0.01 µF bypass capacitor on the BYP pin, output spectral noise density falls to under 20 µV RMS across the 10 Hz to 100 kHz audio band, which is significant for handheld instrumentation.
The LT1761 architecture uses a PNP pass transistor that allows the regulator to operate with very low dropout and to handle input voltages well above the output. Internal protection includes constant-current current limiting, safe-area protection for the pass element, and thermal shutdown that engages at approximately 145°C junction temperature. The device is stable with small ceramic output capacitors (1 µF or larger), simplifying PCB layout in space-constrained designs.
Typical applications include battery-powered handheld instruments, wireless sensor nodes, cellular phone power management, and post-regulation after a switching converter. Its low quiescent current and low noise make it especially well suited for single-cell Li-Ion and two-cell AA/AAA battery stacks where efficiency at light load is critical.
When designing with the LT1761ES5-3.3, place the 0.01 µF BYP bypass capacitor as close as possible to the BYP pin to realize the specified 20 µV RMS noise performance. Use a low-ESR ceramic output capacitor of at least 1 µF (X5R or X7R) for output stability. Do not leave the SHDN pin floating; tie it to IN or drive it with a logic signal.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes that are not aggregated in any single manufacturer datasheet, helping engineers evaluate the LT1761ES5-3.3 for both new designs and legacy replacements.
ドロップイン代替品: LT1761ES5-3.3 — 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:
LT1761ES5-3.3#TRPBF
✅ ドロップイン📋 参考代替品（カタログ未掲載）
LT1761ES5-3.3#TRMPBF
✅ ドロップイン📋 参考代替品（カタログ未掲載）
LT1761IS5-3.3#PBF
✅ ドロップイン📋 参考代替品（カタログ未掲載）
LT1761ES5-BYP
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
TPS7A0210PDBVR
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MCP1700-3302E
✅ ドロップイン📋 参考代替品（カタログ未掲載）
LT1761ES5-3.3 最大定格＆電気的特性
| Manufacturer | Analog Devices (formerly Linear Technology) |
| MPN | LT1761ES5-3.3 |
| トポロジー | LDO (Low-Dropout) Linear Regulator |
| 出力タイプ | Fixed 3.3 V |
| 出力電圧 | 3.3 V |
| 最大出力電流 | 100 mA |
| 入力電圧範囲 | 1.8 V to 20 V |
| ドロップアウト電圧 | 300 mV at 100 mA (typical) |
| 静止電流 | 20 µA (typical) |
| シャットダウン電流 | < 0.1 µA |
| Output Noise (with 0.01 µF BYP cap) | 20 µV RMS (10 Hz to 100 kHz) |
| Output Voltage Accuracy | ±1% over line, load, and temperature |
| 動作温度範囲 | -40°C to +125°C |
| パッケージ | TSOT-23-5 (S5) |
| 実装タイプ | Surface Mount |
| RoHS ステータス | Compliant (lead-free, PBF suffix) |
| Protection Features | Reverse-battery, reverse-current, current limit, thermal shutdown |
| BYP Pin | Yes (0.01 µF for low noise) |
| SHDN Pin | Yes (active-high logic) |
LT1761ES5-3.3 ピン構成
| ピン 1 | IN — Input supply voltage (1.8 V to 20 V) |
| ピン 2 | GND — Ground reference |
| ピン 3 | SHDN — Shutdown input (active-high logic; tie to IN if unused) |
| ピン 4 | BYP — Bypass pin for low-noise operation; connect 0.01 µF to GND |
| ピン 5 | OUT — Regulated output (3.3 V fixed) |
主な用途
LT1761ES5-3.3 の用途: 7 件s: Battery-Powered Handheld Instruments, Wireless Sensor Nodes / IoT, Cellular Phone Power Management, Post-Switching Regulator Filtering, Industrial 12 V / 24 V Rail Regulation, Low-Noise Analog / Audio Front-End, Automotive Aftermarket Electronics.
Battery-Powered Handheld Instruments
The LT1761ES5-3.3 is exceptionally well suited for battery-powered handheld instruments such as digital multimeters, portable data loggers, and field meters. Its 20 µA quiescent current and sub-0.1 µA shutdown current extend battery life dramatically in always-on or duty-cycled designs, while the wide 1.8 V to 20 V input range allows operation from two-cell AA, single-cell Li-Ion, or 9 V battery stacks. The 20 µV RMS output noise floor (with 0.01 µF BYP cap) ensures that measurement accuracy is not compromised by regulator self-noise, and the TSOT-23-5 package occupies less than 9 mm² of board area, fitting easily in compact handheld enclosures. For multi-rail designs, the SHDN pin enables sequenced power-up of analog and digital sections.
おすすめ
Wireless Sensor Nodes / IoT
Wireless sensor nodes and IoT edge devices benefit directly from the LT1761ES5-3.3's 20 µA quiescent current and 3.3 V output. The regulator can power a low-power MCU, a sub-GHz or BLE radio, and sensor front-ends from a 3.6 V Li-Ion primary cell or a harvested energy source. The 300 mV dropout at 100 mA allows the device to maintain regulation down to approximately 3.6 V input, maximizing usable battery capacity. The 20 µV RMS output noise is well below the noise floor of typical sensor signals, so the regulator does not degrade ADC or measurement accuracy. The SHDN pin allows the host MCU to put the entire node into deep sleep with less than 0.1 µA quiescent draw.
おすすめ
Cellular Phone Power Management
The LT1761ES5-3.3 serves as a low-noise post-regulator in cellular phone power management, providing a clean 3.3 V rail for baseband, RF transceiver, or audio codec subcircuits. The device accepts the variable voltage from a Li-Ion battery (3.0 V to 4.2 V) and maintains regulation with only 300 mV dropout. With a 0.01 µF bypass capacitor the output noise falls to 20 µV RMS, well below the audio codec noise floor and well below the RF synthesizer phase-noise sensitivity. The TSOT-23-5 package fits under the phone's main PCB shield, and the SHDN pin allows the baseband processor to disable the rail during deep sleep to extend standby time. The device's reverse-battery and reverse-current protection safeguard the phone against accidental polarity reversal during service.
おすすめ
Post-Switching Regulator Filtering
When paired with a switching DC-DC converter upstream, the LT1761ES5-3.3 acts as a low-noise post-regulator that strips switching ripple from a 3.3 V or 5 V rail. The high PSRR (60 dB+ at 1 kHz typical for the LT1761 family) attenuates the switching frequency and its harmonics, leaving a clean rail for analog or RF circuitry. This dual-converter topology is common in portable medical, instrumentation, and audio products where switching-converter efficiency is required for battery life but switching noise is unacceptable on sensitive analog rails. The 100 mA output capability covers most post-regulation needs, and the small TSOT-23-5 footprint adds minimal board area.
おすすめ
Industrial 12 V / 24 V Rail Regulation
Industrial control systems, factory automation PLCs, and process controllers commonly operate from 12 V or 24 V bus rails. The LT1761ES5-3.3 accepts up to 20 V input (suitable for 12 V systems and 15 V nominal rails) and provides a regulated 3.3 V output for digital logic, MCUs, and transceivers. Its ±1% output accuracy ensures stable supply voltages for industrial communication transceivers and ADC references. Internal protection features (reverse-battery, reverse-current, current limit, thermal shutdown) make the device robust in the harsh electrical environment of industrial cabinets, where voltage transients and reverse wiring can occur during maintenance. The wide -40°C to +125°C operating temperature range supports outdoor and uncontrolled-temperature installations.
おすすめ
Low-Noise Analog / Audio Front-End
Precision analog front-ends such as microphone preamplifiers, audio ADCs, and instrumentation amplifiers require ultra-low-noise power rails. The LT1761ES5-3.3 with a 0.01 µF bypass capacitor achieves 20 µV RMS output noise across the 10 Hz to 100 kHz audio band, making it ideal as a dedicated rail for these sensitive stages. The high PSRR rejects any residual ripple from upstream switching converters, while the 100 mA current capability is sufficient for typical microphone biasing and preamp supply needs. The 5-pin TSOT-23-5 package allows the regulator to be placed physically close to the analog stage, minimizing PCB trace impedance and preserving the noise performance in real-world layouts.
おすすめ
Automotive Aftermarket Electronics
The LT1761ES5-3.3 is well suited for non-safety automotive aftermarket applications such as dashcams, GPS trackers, OBD-II dongles, and infotainment accessories. Its 20 V absolute-maximum input withstands the load-dump and jump-start transients common on 12 V automotive buses, and internal reverse-battery protection prevents damage if the accessory is mis-wired. The 3.3 V output supplies the radio MCU, GPS receiver, or accelerometer, while the 20 µA quiescent current is negligible compared to the rest of the always-on system. For OEM-grade safety applications requiring AEC-Q100, designers should evaluate the LT1761 Q-grade variant or one of TI's AEC-Q100 LDOs instead.
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: LT1761ES5-3.3 — 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 | LT1761ES5-3.3#TRPBF | LT1761IS5-3.3#PBF | TPS7A0210PDBVR | MCP1700-3302E |
|---|---|---|---|---|---|
| Package | TSOT-23-5 | TSOT-23-5 (same) | TSOT-23-5 (same) | SOT-23-5 (compatible footprint) | SOT-23-3 / TO-92 |
| Brand | Analog Devices | Analog Devices | Analog Devices | Texas Instruments | Microchip Technology |
| Output Voltage | 3.3 V fixed | 3.3 V fixed | 3.3 V fixed | 3.3 V fixed | 3.3 V fixed |
| Max Output Current | 100 mA | 100 mA | 100 mA | 200 mA | 250 mA |
| Input Voltage Range | 1.8 V to 20 V | 1.8 V to 20 V | 1.8 V to 20 V | 1.5 V to 6.5 V | 2.3 V to 6.0 V |
| Quiescent Current | 20 µA | 20 µA | 20 µA | 25 µA | 1.6 µA |
| Dropout Voltage @ Full Load | 300 mV at 100 mA | 300 mV at 100 mA | 300 mV at 100 mA | 170 mV at 200 mA | 178 mV at 250 mA |
| Shutdown Pin | Yes (SHDN) | Yes | Yes | Yes | No (3-pin SOT-23) |
主な差別化要因
- Wider input voltage range than most 3.3 V LDO competitors （vs TPS7A0210PDBVR)
- Lower quiescent current than mainstream 3.3 V LDOs （vs MCP1700-3302E (in 3.3 V LDO category))
- Sub-µA shutdown current for ultra-low standby power （vs TPS7A0210PDBVR)
設計ノート
At 20 V input, 3.3 V output, and 100 mA load, the LT1761ES5-3.3 dissipates approximately (20 V - 3.3 V) × 0.1 A = 1.67 W. The TSOT-23-5 package has a thermal resistance of roughly 150-200 °C/W on a 1-oz copper pour, resulting in a 250-330 °C junction-temperature rise above ambient. A larger copper pour, thermal via array, or reduced VIN (such as 5 V instead of 20 V) is strongly recommended for continuous 100 mA operation at high VIN.
Place the 0.01 µF BYP bypass capacitor as close as possible to the BYP pin (pin 4) with a short, direct ground return to the GND pin (pin 2). Use a 1 µF or larger X5R/X7R low-ESR ceramic capacitor on the output (pin 5) with the same short-trace discipline. Keep the input capacitor (≥ 1 µF) on pin 1 close to the IC. Avoid routing high-current switching traces near the BYP pin to prevent noise injection into the reference.
Do not leave the SHDN pin (pin 3) floating - either tie it directly to IN or drive it with a logic signal. A floating SHDN pin can cause indeterminate output behavior. Do not omit the BYP capacitor if you need the specified 20 µV RMS noise performance. Do not exceed the 20 V absolute maximum input rating, even briefly, as transients above this level can damage the pass transistor. For applications where input transients are expected, add a TVS or Zener clamp at the input.
コンプライアンス情報
LT1761ES5-3.3#TRPBF and #TRMPBF are lead-free (Pb-free) and RoHS compliant per Analog Devices product page. #PBF suffix also indicates lead-free finish. The device is not AEC-Q100 qualified; for automotive applications use an AEC-Q100 alternative such as TI TPS7A02-Q1.
