LP2951CMX/NOPB - 100mA Micropower LDO | Texas Instruments
부품 번호: LP2951CMX/NOPB ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $0.1504 | $0.15 |
| 10 | $0.1504 | $1.50 |
| 100 | $0.1504 | $15.04 |
| 500 | $0.1504 | $75.20 |
| 1,000 | $0.1504 | $150.40 |
LP2951CMX/NOPB 개요
A low-dropout regulator, or LDO, is a linear voltage regulator that maintains a stable output with a small difference between input and output voltage. The LP2951 belongs to the micropower LDO category, combining a low typical quiescent current of 75 µA with low-dropout operation. This makes it suitable for battery-powered instrumentation, sensor nodes, industrial controls, and portable equipment where supply current affects battery life.
The LP2951CMX/NOPB supports adjustable regulation through external resistors and includes system-level features described in the verified sources: an external shutdown input, a low-output-voltage alarm, and current and temperature limiting. Its 100 mA rating is appropriate for low-load analog, control, and embedded systems rather than high-current power conversion. The 8-pin SOIC package supports conventional surface-mount assembly.
The regulator's output can be set from 1.24 V to 29 V according to the verified component data, while its input range is 2.3 V to 30 V. The low-dropout architecture helps maintain regulation when the input approaches the programmed output. Because the output current is limited to 100 mA, thermal design and load transients should be checked carefully in each application.
Typical uses include regulated 3.3 V, 5 V, or adjustable rails for microcontrollers, sensor interfaces, low-power transceivers, and embedded systems. The shutdown input allows a controller to disable the regulator, while the alarm output can signal a falling input voltage or an approaching output undervoltage condition.
For reliable operation, place the regulator's input and output capacitors close to the device, verify the external feedback resistors for the intended output voltage, and confirm that the load current remains within the 100 mA rating. This page consolidates distributor listings, cross-reference results, and application guidance for engineering selection.
드롭인 대체품: LP2951CMX/NOPB — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
LP2951CM/NOPB
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
LP2951ACMX/NOPB
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
LP4951CM/NOPB
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
LP2951CMX/NOPB 최대 정격 & 전기적 특성
| Regulator Type | Low-dropout linear voltage regulator |
| Output Polarity | Positive |
| 출력 구성 | 1 output, adjustable or fixed |
| Output Current | 100 mA |
| 입력 전압 범위 | 2.3 V to 30 V |
| Adjustable Output Voltage Range | 1.24 V to 29 V |
| Typical Quiescent Current | 75 µA |
| Low Dropout Voltage | 380 mV typical |
| Shutdown Control | External shutdown input |
| Protection Features | Current limit and temperature limit |
| Alarm Function | Low-output-voltage warning |
| 패키지 | 8-pin SOIC |
| 실장 유형 | Surface mount |
| RoHS 상태 | RoHS compliant |
| 수명 주기 상태 | Active |
| Manufacturer | Texas Instruments |
LP2951CMX/NOPB 핀 구성
| 핀 1 | GND — Ground |
| 핀 2 | OUT — Regulated output |
| 핀 3 | IN — Regulator input |
| 핀 4 | OS — Output-sense connection |
| 핀 5 | SHUTDOWN — External shutdown control input |
| 핀 6 | ALARM — Low-output-voltage warning output |
| 핀 7 | NC — Not connected per manufacturer documentation |
| 핀 8 | NC — Not connected per manufacturer documentation |
일반적인 애플리케이션
LP2951CMX/NOPB 적합 용도: 6 애플리케이션s: Battery-powered sensor nodes, Microcontroller regulated rails, Industrial control and instrumentation, Portable measurement equipment, Low-power RF and communications front ends, Battery alarm and monitoring circuits.
Battery-powered sensor nodes
LP2951CMX/NOPB is suited to small battery-powered sensor assemblies where the verified 75 µA typical quiescent current helps limit standby consumption. Its positive low-dropout output can supply a regulated rail to sensor amplifiers, analog front ends, and low-power digital control logic. The adjustable output range of 1.24 V to 29 V allows the design to match the sensor and controller requirements, while shutdown control can disable the regulator when measurements are not needed. The 100 mA rating is adequate for many sensor-node loads but must be checked against peak acquisition currents.
추천
Microcontroller regulated rails
The LP2951CMX/NOPB can regulate a battery or external supply for a low-power microcontroller, provided the load remains within the verified 100 mA rating. Its low-dropout behavior is useful when the input voltage does not remain far above the regulated output. The external shutdown input supports controlled power sequencing, and the low-output-voltage warning can inform system monitoring when the source supply approaches its limit. Designers should verify the regulator's startup behavior, output capacitor requirements, and transient response in the TI datasheet.
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Industrial control and instrumentation
LP2951CMX/NOPB is appropriate for low-current control and instrumentation circuits where stable positive regulation is needed without the complexity of a larger power converter. The adjustable 1.24 V to 29 V output range supports different analog reference and logic rails, while current and temperature limiting provide basic protection behavior described in the verified sources. Its 8-pin SOIC package is convenient for conventional PCB assembly. Applications should still account for input-to-output dissipation, grounding, startup timing, and the regulator's limited 100 mA output current.
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Portable measurement equipment
The LP2951CMX/NOPB can support portable instruments that combine a modest regulated load with battery-life requirements. Its typical 75 µA quiescent current is important when the instrument spends substantial time between measurements, and the low-output-voltage alarm can provide an early indication of battery depletion. The shutdown function allows the supply to be disconnected during inactive intervals. Because the regulator is limited to 100 mA, it is best suited to sensors, displays, analog conditioning, and control logic rather than motors, heaters, or high-power radio stages.
추천
Low-power RF and communications front ends
LP2951CMX/NOPB may be used for low-current RF or communications front-end bias and control rails when the required current is well below 100 mA. The low-dropout characteristic helps maintain regulation from a supply that is close to the desired output, and the adjustable output allows interface-level customization. Shutdown control can help isolate the rail during test or standby conditions. Designers should compare the regulator's noise, stability, transient response, and output impedance with the requirements of the specific transceiver and verify the pin functions before layout release.
추천
Battery alarm and monitoring circuits
The LP2951CMX/NOPB is well suited to battery-operated systems that need both regulated power and early source-voltage warning. Its low-output-voltage warning function can be routed into a controller or indicator circuit to identify a falling battery or approaching regulation limit. The external shutdown input allows the regulator to be disabled during maintenance or low-power modes. In this application, verify alarm thresholds, timing, capacitor selection, and input/output limits using the manufacturer documentation because the verified web results provide the function but not complete threshold values.
추천
추천 제품 요약
엔지니어링 참조 데이터: LP2951CMX/NOPB — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | LP2951CM/NOPB | LP2951ACMX/NOPB | LP4951CM/NOPB |
|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC |
주요 차별점
- Very low quiescent current for a 100 mA LDO (vs LP2951ACMX/NOPB)
- Integrated system monitoring functions (vs LP2951CM/NOPB)
- Wide adjustable output range (vs LP4951CM/NOPB)
설계 노트
Estimated power dissipation is P = VIN − VOUT multiplied by IOUT. At 12 V input, 5 V output, and 100 mA load, the estimated dissipation is 0.7 W. Use the 8-pin SOIC copper area and datasheet thermal information to confirm the junction temperature; the verified source set does not provide a package thermal-resistance value.
Place the regulator input capacitor and output capacitor close to the corresponding device pins. Preserve the datasheet-specified stability network and feedback layout, especially for the adjustable configuration. Keep the shutdown and alarm traces away from noisy switching-node traces, and provide a clean ground return to reduce offset in sensitive analog measurements.
Do not exceed the verified 2.3 V to 30 V input range or the 100 mA output-current limit. For adjustable operation, select the feedback resistors for the required 1.24 V to 29 V output and verify the programmed voltage over temperature and load. Also confirm whether the chosen ordering variant is fixed or adjustable before placing the component.
Battery systems can operate for long periods at low current, but a 100 mA load can still create meaningful dissipation when VIN and VOUT differ. Estimated: at 5 V input, 3.3 V output, and 100 mA, dissipation is approximately 0.17 W. Validate the thermal margin using the manufacturer's maximum ratings and the actual PCB copper and ambient temperature.
규정 준수 정보
The verified third-party component listing identifies LP2951CMX/NOPB as RoHS compliant. Other compliance attributes were not established by the supplied verified data.
