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Texas Instruments LP2951CMMX-3.3
- Part No.:
- LP2951CMMX-3.3
- Manufacturer:
- Texas Instruments
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LP2951CMMX-3.3.pdf
- Description:
- IC REG LIN POS ADJ 100MA 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,244
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Product details
Overview
LP2951CMMX-3.3 from Texas Instruments is a micropower low-dropout (LDO) voltage regulator with fixed 3.3 V output, 100 mA guaranteed output current, 75 µA typical quiescent current, and 380 mV typical dropout at full load-designed for battery-powered systems requiring stable low-voltage supply with shutdown control and error flag indication.
For engineers reviewing the LP2951CMMX-3.3 datasheet, LP2951CMMX-3.3 pinout, LP2951CMMX-3.3 application, or LP2951CMMX-3.3 equivalent, this page delivers verified technical context, exact pin functions, real-world design meaning of specifications, and validated alternative options for power management in portable, industrial, and embedded systems.
Technical Context
The LP2951CMMX-3.3 integrates a precision 1.235 V bandgap reference, error amplifier, PNP pass transistor, and dedicated comparator circuitry enabling both logic-controlled shutdown (SHUTDOWN pin) and output undervoltage detection (ERROR pin). Its architecture supports fixed-output operation without external feedback resistors while retaining programmability capability via SENSE/FEEDBACK pins.
It operates across 2.3 V to 30 V input range, maintains regulation down to 40 mV dropout at light loads, and features internal foldback current limiting and thermal shutdown-ensuring robustness in variable-input, space-constrained, or thermally sensitive applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±0.5% at 25°C; ensures stable MCU core/logic rail without trimming or calibration. |
| Max Output Current | 100 mA guaranteed; sufficient for microcontrollers, sensors, and RF modules in portable designs. |
| Quiescent Current | 75 µA typical; extends battery life in always-on or low-duty-cycle monitoring systems. |
| Dropout Voltage | 380 mV typical at 100 mA; enables operation from single-cell Li-ion (3.0 V min) or two-cell alkaline (3.2 V min). |
| Line Regulation | 0.03% typical; minimizes output variation across wide input swings (e.g., 3.6 V → 25 V), critical for automotive or industrial inputs. |
| Load Regulation | 0.04% typical; maintains tight output stability under dynamic load changes (e.g., sensor burst transmission). |
| Reference Voltage | 1.235 V ±1.2%; enables accurate external programmability and serves as stable low-power reference for ADCs or comparators. |
| Error Flag Threshold | ~5% output drop (≈165 mV at 3.3 V); provides reliable power-on reset or brownout warning before system failure. |
Pinout & Package
LP2951CMMX-3.3 is packaged in an 8-pin SOIC (D package), 4.90 mm × 3.91 mm body size, with exposed thermal pad (DAP) connected to GND for enhanced thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT (Pin 1) | Regulated output | Delivers stable 3.3 V to load; requires 2.2 µF low-ESR ceramic capacitor for stability. |
| SENSE (Pin 2) | Output voltage sense | Monitors actual output at remote point; enables Kelvin sensing to compensate PCB trace IR drop. |
| SHUTDOWN (Pin 3) | Logic enable/disable input | Active-high: ≥2 V turns regulator ON; ≤0.6 V forces shutdown, reducing quiescent current to ≤10 µA. |
| GND (Pin 4) | Ground reference | Common return path for all internal circuits; DAP must be soldered to PCB ground plane for thermal integrity. |
| ERROR (Pin 5) | Undervoltage flag output | Open-collector logic-low when VOUT drops >5%; pulls up externally for reset generation or fault logging. |
| VTAP (Pin 6) | Internal divider tap | Provides access to internal 1.235 V reference node; used with external resistors for adjustable output configurations. |
| FEEDBACK (Pin 7) | Voltage feedback input | Accepts external resistor divider to program output from 1.24 V to 29 V; bias current <40 nA minimizes divider error. |
| IN (Pin 8) | Input supply | Accepts 2.3 V–30 V unregulated input; requires 1 µF ceramic decoupling close to pin for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Logic-Controlled Shutdown | Reduces total system quiescent current to ≤10 µA during sleep mode-critical for multi-year battery life in IoT endpoints. |
| Output Undervoltage Detection | ERROR pin asserts before VOUT falls outside ±5%, enabling clean power-on reset or graceful firmware shutdown. |
| Stable with Low-ESR Capacitors | Works reliably with 10 mΩ–6 Ω ESR output capacitors (e.g., X5R/X7R ceramics), eliminating need for costly tantalum or polymer types. |
| High-Accuracy Reference Core | 1.235 V ±1.2% reference with 20 ppm/°C tempco enables use as precision voltage reference in analog subsystems. |
| Thermal & Current Protection | Foldback current limit and thermal shutdown prevent damage during short-circuit or high-ambient conditions without external components. |
| Fixed + Programmable Flexibility | Pin-strapped 3.3 V operation simplifies BOM; FEEDBACK/VTAP pins allow field reconfiguration to other voltages if needed. |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Continuous glucose monitor with Bluetooth LE transmission powered by coin cell. IC Role / Device Role / Timing Role: Primary 3.3 V LDO supplying MCU, BLE radio, and analog front-end; ERROR pin triggers alert on battery depletion. Use Value: 75 µA quiescent current enables >3-year shelf life; 380 mV dropout allows full utilization of 2.8 V–3.0 V coin cell range. |
Use Scenario: DIN-rail mounted analog input module operating from 24 V DC industrial bus. IC Role / Device Role / Timing Role: Local 3.3 V regulator for isolated ADC and microcontroller; SHUTDOWN pin enables remote power cycling via PLC logic. Use Value: 30 V max input withstands load-dump transients; ±0.5% output accuracy ensures precise sensor scaling without software calibration. |
| Smart Meter Battery Backup | Automotive Body Control Unit |
|
Use Scenario: Electricity meter maintaining real-time clock and memory during AC mains failure using supercapacitor. IC Role / Device Role / Timing Role: Low-quiescent LDO converting supercapacitor voltage (up to 5.5 V) to regulated 3.3 V; SENSE pin compensates for series resistance. Use Value: Kelvin sensing via SENSE eliminates voltage drop error across backup path; 40 mV dropout at light load maximizes usable supercap energy. |
Use Scenario: Door module with LIN transceiver, window motor driver, and proximity sensor. IC Role / Device Role / Timing Role: Secondary 3.3 V regulator for LIN PHY and microcontroller; ERROR pin feeds diagnostic CAN message on undervoltage. Use Value: HBM ±2500 V ESD rating on IN/OUT/GND pins meets automotive EMC requirements; thermal shutdown prevents latch-up during hot-car scenarios. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar micropower LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV70733PDQNR | Lower quiescent current (25 µA), lower max input (5.5 V), no ERROR/SHUTDOWN pins, SOT-563 package. | Suitable only for low-input-voltage, ultra-low-power apps without fault reporting or remote enable. | Choose TLV70733PDQNR only if input stays ≤5.5 V and system-level fault signaling is handled elsewhere. |
| MCP1804T-3302I/OT | Higher dropout (600 mV @100 mA), no ERROR/SHUTDOWN, SOT-23-5 package, ±2% output tolerance. | Lacks diagnostics and enable control; better suited for cost-sensitive, non-critical rails where 3.3 V ±2% is acceptable. | Select MCP1804T-3302I/OT when budget constraints outweigh need for accuracy, diagnostics, or wide VIN range. |
Compared with TLV70733PDQNR and MCP1804T-3302I/OT, LP2951CMMX-3.3 uniquely combines wide 2.3–30 V input, integrated error flag and shutdown, ±0.5% accuracy, and 380 mV dropout-making it the only choice for battery-backed industrial or automotive subsystems requiring autonomous fault response and long runtime.
Availability
LP2951CMMX-3.3 is available at Aetrix Electronics and suitable for portable medical devices, industrial PLC I/O modules, smart meter battery backup circuits, and automotive body control units requiring stable component supply with full traceability and lifecycle support.
Supply support for LP2951CMMX-3.3 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 leader specializing in analog and embedded processing technologies, with decades of expertise in precision power management ICs.
The LP295x-N series was designed specifically for micropower, low-dropout regulation in battery-constrained and safety-aware systems-emphasizing accuracy, reliability, and integrated diagnostics over raw efficiency.
FAQ
What is the minimum input voltage required for LP2951CMMX-3.3 to maintain regulation?
The LP2951CMMX-3.3 requires a minimum input voltage of 3.3 V plus dropout voltage. At 100 mA load, typical dropout is 380 mV, so minimum VIN is ~3.68 V. At light loads (100 µA), dropout drops to 50 mV, allowing operation down to ~3.35 V. The absolute minimum specified input is 2.3 V, but regulation cannot be maintained below VOUT + VDO.
Can LP2951CMMX-3.3 be used as a precision voltage reference?
Yes-LP2951CMMX-3.3 contains a 1.235 V ±1.2% internal reference with 20 ppm/°C temperature coefficient. When configured with VTAP and FEEDBACK pins open (or tied appropriately), it delivers a stable, low-drift reference suitable for ADC references or comparator thresholds without external components.
How does the ERROR pin of LP2951CMMX-3.3 behave during startup and dropout?
The ERROR pin of LP2951CMMX-3.3 is an open-collector output that remains high-impedance until VOUT reaches ~95% of nominal (≈3.135 V). It pulls low when VOUT drops >5% below 3.3 V (≤3.135 V), providing hysteresis to avoid chatter near threshold. During startup, ERROR stays high until regulation is established.
Is LP2951CMMX-3.3 compatible with ceramic output capacitors?
Yes-LP2951CMMX-3.3 is explicitly characterized for stability with ceramic capacitors having ESR between 10 mΩ and 6 Ω. A 2.2 µF X5R/X7R ceramic capacitor placed close to the OUT and GND pins satisfies stability requirements and eliminates need for electrolytic or tantalum types.
What thermal considerations apply to LP2951CMMX-3.3 in SOIC (D) package?
In SOIC-8 (D) package, LP2951CMMX-3.3 has RθJA = 117.7°C/W on standard JEDEC High-K board. With 100 mA load and 5 V dropout (0.5 W dissipation), junction rise is ~59°C above ambient. To stay within 125°C max TJ, ambient must remain ≤66°C unless PCB copper area or thermal vias reduce effective RθJA.
LP2951CMMX-3.3 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:
- Obsolete
- 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
LP2951CMMX-3.3 FAQ
1.How can I place an order for LP2951CMMX-3.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP2951CMMX-3.3 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 LP2951CMMX-3.3 reliable?
The price and inventory of LP2951CMMX-3.3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP2951CMMX-3.3 is usually 5 days.
3.What payment methods are accepted for LP2951CMMX-3.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP2951CMMX-3.3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP2951CMMX-3.3?
LP2951CMMX-3.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP2951CMMX-3.3 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 LP2951CMMX-3.3?
For technical support, including LP2951CMMX-3.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP2951CMMX-3.3 requirements.
6.How does Aetrix verify that LP2951CMMX-3.3 is sourced from the original manufacturer or authorized distributors?
All LP2951CMMX-3.3 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 LP2951CMMX-3.3 meets industry standards.
7.What is the process for return or replacement of LP2951CMMX-3.3?
All LP2951CMMX-3.3 units undergo pre-shipment inspection (PSI). If there is an issue with LP2951CMMX-3.3, 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 LP2951CMMX-3.3 part is unused and in its original packaging.
Return procedure for LP2951CMMX-3.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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