My Inquiry
My Account
Texas Instruments LP2951ACMMX-3.3/NOPB
- Part No.:
- LP2951ACMMX-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LP2951ACMMX-3.3/NOPB.pdf
- Description:
- IC REG LIN POS ADJ 100MA 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,539
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LP2951ACMMX-3.3/NOPB from Texas Instruments is a micropower, low-dropout (LDO) linear voltage regulator with fixed 3.3 V output, logic-controlled shutdown, error flag output, and programmable feedback capability. It delivers up to 100 mA with 75 µA typical quiescent current, 380 mV dropout at full load, and ±0.5% initial output accuracy - ideal for battery-powered instrumentation and portable medical devices requiring stable low-power regulation.
For engineers reviewing the LP2951ACMMX-3.3/NOPB datasheet, LP2951ACMMX-3.3/NOPB pinout, LP2951ACMMX-3.3/NOPB application, or LP2951ACMMX-3.3/NOPB equivalent, key selection criteria include dropout behavior under light-to-full load, shutdown current in OFF state (<10 µA), error flag threshold tolerance (±5% VOUT), thermal performance in VSSOP-8, and compatibility with low-ESR ceramic output capacitors (10 mΩ–6 Ω).
Technical Context
The LP2951ACMMX-3.3/NOPB integrates a precision 1.235 V bandgap reference, error amplifier, PNP pass transistor, and dedicated comparator circuitry for output monitoring. Its shutdown input accepts TTL/CMOS-compatible logic levels (ON <0.6 V, OFF >2 V), while the ERROR pin asserts low when VOUT drops ≥5% below nominal - enabling power-on reset or battery-low indication without external components.
Unlike the LP2950 series, the LP2951ACMMX-3.3/NOPB supports both fixed-output operation and adjustable-mode configuration via external resistors on FEEDBACK and SENSE pins. The internal VTAP node provides access to the reference divider, allowing accurate feedback scaling without loading the reference.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±0.5% at 25°C; ±0.6% over –40°C to +125°C - ensures stable MCU core supply across automotive temperature range. |
| Dropout Voltage | 380 mV at 100 mA load - enables regulation from 3.68 V input, critical for single-cell Li-ion or 4×AA alkaline systems. |
| Quiescent Current | 75 µA typical (140 µA max at –40°C to +125°C) - extends battery life in always-on sensor nodes. |
| Shutdown Current | 3 µA typical (20 µA max) - reduces system standby power to sub-microwatt levels when disabled. |
| Error Flag Threshold | Output drops ≥5% (165 mV at 3.3 V) before ERROR goes low - provides reliable undervoltage warning with built-in hysteresis. |
| Input Voltage Range | 2.3 V to 30 V - supports wide-input industrial power rails and legacy 24 V systems with local LDO post-regulation. |
| Output Capacitor ESR | Stable with 10 mΩ to 6 Ω - compatible with low-ESR ceramic capacitors (e.g., 2.2 µF X7R), eliminating need for tantalum. |
Pinout & Package
VSSOP-8 (DGK) package: 3.00 mm × 3.00 mm body, 0.65 mm pitch, exposed thermal pad (DAP) connected to GND - optimized for space-constrained PCBs with moderate power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Regulated output | Delivers 3.3 V to load; requires 2.2 µF ceramic capacitor to ground for stability. |
| 2 (SENSE) | Output voltage sense | Monitors regulated output directly at load point; enables remote sensing to compensate for PCB trace IR drop. |
| 3 (SHUTDOWN) | Logic enable/disable control | Pull ≤0.6 V to enable regulator; pull ≥2 V to enter ultra-low-power shutdown mode. |
| 4 (GND) | Ground reference | Common return path for all internal circuits; DAP must be soldered to PCB ground plane for thermal performance. |
| 5 (ERROR) | Error flag output | Open-collector output pulls low when VOUT falls ≥5%; requires external pull-up for microcontroller interrupt or reset assertion. |
| 6 (VTAP) | Internal reference tap | Provides access to internal 1.235 V reference divider node; used with external resistors for adjustable output configurations. |
| 7 (FEEDBACK) | Voltage feedback input | Accepts resistor-divider voltage from VTAP or external source; sets output voltage in programmable mode (1.24 V–29 V). |
| 8 (IN) | Input supply | Accepts unregulated input (2.3 V–30 V); requires 1 µF ceramic decoupling capacitor close to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Logic-compatible shutdown | Enables deterministic power sequencing in multi-rail systems with <0.6 V ON / >2 V OFF thresholds and <100 µA input current. |
| Integrated error comparator | Provides fail-safe output monitoring with 5% dropout detection, 15 mV hysteresis, and open-drain ERROR output for direct MCU interface. |
| Ultra-low quiescent current | 75 µA typical increases only marginally in dropout - preserves battery capacity during brownout conditions. |
| High-accuracy reference | 1.235 V ±1.2% bandgap reference with 20 ppm/°C tempco - supports use as precision voltage reference in analog subsystems. |
| Thermal and current protection | Foldback current limiting (160–220 mA) and thermal shutdown prevent damage during overload or ambient overheating. |
Applications
| Battery-Powered IoT Sensor Node | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Continuous environmental monitoring using ultra-low-power MCU, ADC, and wireless transceiver powered by coin cell or Li-SOCl₂ battery. IC Role / Device Role / Timing Role: Primary 3.3 V LDO supplying MCU core, RF interface, and analog front-end; shutdown controlled by MCU sleep timer. Use Value: 75 µA quiescent current and 3 µA shutdown current extend battery life to >5 years; ERROR flag triggers wake-up on low-battery condition. |
Use Scenario: Isolated digital input module receiving 24 V DC field power, converting to clean 3.3 V for logic-level interface and status reporting. IC Role / Device Role / Timing Role: Post-regulator after primary DC/DC converter; SENSE pin compensates for voltage drop across isolation barrier traces. Use Value: 30 V max input withstands industrial surge transients; 380 mV dropout ensures regulation even during 24 V rail sag to 26 V. |
| Portable Medical Pulse Oximeter | Automotive Body Control Module (BCM) |
|
Use Scenario: Handheld device with LED drivers, photodiode amplifier, and BLE radio operating from two AAA batteries (2.4–3.2 V). IC Role / Device Role / Timing Role: Low-noise 3.3 V supply for analog signal chain and digital logic; ERROR flag disables LED drivers before battery cutoff. Use Value: 100 µVRMS output noise (10 Hz–100 kHz) prevents interference in weak photodiode signals; stable with 2.2 µF ceramic capacitor. |
Use Scenario: Central electronics unit managing door locks, lighting, and window controls in passenger vehicles with 12 V battery supply. IC Role / Device Role / Timing Role: Secondary LDO powering CAN transceiver and microcontroller peripherals; SHUTDOWN synchronized with vehicle ignition state. Use Value: –40°C to +125°C operating range meets AEC-Q100 Grade 2 requirements; 50 mV dropout at light load maintains regulation during cold cranking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV70733PDQNR | Lower IQ (25 µA), smaller X2SON-4 package, no ERROR or SHUTDOWN pins - fixed-only, no programmability. | Lacks fault monitoring and enable control; suitable only for simple, space-critical point-of-load regulation. | Choose TLV70733PDQNR when board area is constrained and system-level supervision replaces ERROR/SHUTDOWN functions. |
| TPS7A0533PDBVR | Higher PSRR (70 dB @ 1 kHz), 1.5 µA IQ, but no ERROR flag or SENSE pin - fixed 3.3 V, 200 mA output. | Superior ripple rejection for noise-sensitive analog circuits, but lacks diagnostic capability and remote sensing. | Choose TPS7A0533PDBVR for high-PSRR applications like audio or precision ADC supplies where diagnostics are handled externally. |
Compared with TLV70733PDQNR and TPS7A0533PDBVR, LP2951ACMMX-3.3/NOPB uniquely combines error flag, shutdown control, and SENSE-based remote sensing in a thermally robust VSSOP-8 package - making it the only option among the three that supports autonomous battery-fail detection and trace-drop compensation in compact industrial designs.
Availability
LP2951ACMMX-3.3/NOPB is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial PLC I/O modules, and automotive body control units requiring stable component supply with guaranteed long-term availability and consistent parametric performance.
Supply support for LP2951ACMMX-3.3/NOPB includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor company specializing in analog and embedded processing technologies, with leadership in power management ICs for industrial, automotive, and consumer applications.
The LP2951 series was designed specifically for micropower, high-accuracy linear regulation in battery-critical and safety-relevant systems - emphasizing ultra-low IQ, precise voltage reference stability, and integrated fault monitoring.
FAQ
What is the maximum input voltage rating for LP2951ACMMX-3.3/NOPB?
The absolute maximum input voltage for LP2951ACMMX-3.3/NOPB is 30 V. Operation above this level risks permanent damage. For reliable long-term use, TI specifies a recommended maximum of 30 V under normal conditions, with derating advised for high-temperature environments. The LP2951ACMMX-3.3/NOPB maintains regulation down to 2.3 V input, supporting wide-input applications such as 24 V industrial buses or multi-cell battery packs.
Does LP2951ACMMX-3.3/NOPB require an external capacitor on the FEEDBACK pin?
No, LP2951ACMMX-3.3/NOPB does not require an external capacitor on the FEEDBACK pin for stability in fixed-output mode. Stability is ensured with only the specified 2.2 µF output capacitor (low-ESR ceramic). In adjustable mode, capacitor placement depends on resistor values and layout - but no mandatory FEEDBACK pin capacitor exists per TI's design guidelines. The LP2951ACMMX-3.3/NOPB datasheet confirms stability with standard 2.2 µF COUT and no additional capacitors on FEEDBACK or VTAP.
Can LP2951ACMMX-3.3/NOPB be used as a precision voltage reference?
Yes, LP2951ACMMX-3.3/NOPB can serve as a precision voltage reference due to its internal 1.235 V bandgap reference with ±1.2% tolerance and 20 ppm/°C temperature coefficient. When configured in shunt or buffered reference mode using VTAP and FEEDBACK pins, it delivers stable reference voltage independent of load current - validated across –40°C to +125°C. This dual-role capability is explicitly supported in the LP2951ACMMX-3.3/NOPB datasheet Section 8.3.2 and Application Report SLVA723.
What is the minimum output capacitor value required for LP2951ACMMX-3.3/NOPB stability?
The minimum recommended output capacitor for LP2951ACMMX-3.3/NOPB is 2.2 µF ceramic with ESR between 10 mΩ and 6 Ω. TI's datasheet specifies this value for all 3 V and 3.3 V versions to ensure phase margin >45° and prevent oscillation. Using less than 2.2 µF - or exceeding the ESR range - may cause instability or poor transient response. The LP2951ACMMX-3.3/NOPB has been characterized and production-tested with exactly this capacitor value under all operating conditions.
How does the ERROR pin behave during startup and dropout recovery?
The ERROR pin of LP2951ACMMX-3.3/NOPB remains high-Z (open-drain) until VOUT reaches ≥95% of nominal (≥3.135 V), then transitions low only if VOUT drops ≥5% below nominal (≤3.135 V). During startup, ERROR stays high until regulation is established; during dropout recovery, it returns high only after VOUT rises ≥15 mV above the lower threshold (hysteresis). This behavior is confirmed in LP2951ACMMX-3.3/NOPB Electrical Characteristics Table (Section 7.6) and Figure 16 of the datasheet.
LP2951ACMMX-3.3/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Adjustable (Fixed)
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 30V
- Voltage - Output (Min/Fixed):
- 1.235V (3.3V)
- Voltage - Output (Max):
- 29V
- Voltage Dropout (Max):
- 0.6V @ 100mA
- Current - Output:
- 100mA
- Current - Quiescent (Iq):
- 120 µA
- Current - Supply (Max):
- 14 mA
- PSRR:
- -
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
LP2951ACMMX-3.3/NOPB FAQ
1.How can I place an order for LP2951ACMMX-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP2951ACMMX-3.3/NOPB on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LP2951ACMMX-3.3/NOPB reliable?
The price and inventory of LP2951ACMMX-3.3/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP2951ACMMX-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LP2951ACMMX-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP2951ACMMX-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP2951ACMMX-3.3/NOPB?
LP2951ACMMX-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP2951ACMMX-3.3/NOPB order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LP2951ACMMX-3.3/NOPB?
For technical support, including LP2951ACMMX-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP2951ACMMX-3.3/NOPB requirements.
6.How does Aetrix verify that LP2951ACMMX-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LP2951ACMMX-3.3/NOPB products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LP2951ACMMX-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LP2951ACMMX-3.3/NOPB?
All LP2951ACMMX-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP2951ACMMX-3.3/NOPB, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LP2951ACMMX-3.3/NOPB part is unused and in its original packaging.
Return procedure for LP2951ACMMX-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LP2951ACMMX-3.3/NOPB Tags
-
MIC5504-1.8YM5-TR
Microchip Technology
-
MIC5504-3.3YM5-TR
Microchip Technology
-
MIC5365-3.0YC5-TR
Microchip Technology
-
MIC5365-1.8YC5-TR
Microchip Technology
-
MIC5365-2.5YC5-TR
Microchip Technology
-
MIC5365-3.3YC5-TR
Microchip Technology
-
MIC5365-3.3YD5-TR
Microchip Technology
-
MIC5317-3.3YM5-TR
Microchip Technology
-
TLV1117LV33DCYR
Texas Instruments
-
MIC5317-3.3YMT-TZ
Microchip Technology
-
MIC5528-3.3YMT-TR
Microchip Technology
-
TLV75801PDRVR
Texas Instruments
Tech Hub
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
