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Texas Instruments LP2951CMM-3.3
- Part No.:
- LP2951CMM-3.3
- Manufacturer:
- Texas Instruments
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LP2951CMM-3.3.pdf
- Description:
- IC REG LIN POS ADJ 100MA 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,390
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Product details
Overview
LP2951CMM-3.3 from Texas Instruments is a micropower, low-dropout linear 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-power regulation in space-constrained applications.
For engineers reviewing the LP2951CMM-3.3 datasheet, LP2951CMM-3.3 pinout, LP2951CMM-3.3 application, or LP2951CMM-3.3 equivalent, key selection criteria include dropout performance under light-to-full load, error flag behavior during input sag, shutdown logic compatibility, thermal derating in SOIC-8 packages, and stability with low-ESR ceramic capacitors ≥2.2 µF.
Technical Context
The LP2951CMM-3.3 integrates a precision 1.235 V bandgap reference, error amplifier, PNP pass transistor, and dedicated comparator circuitry for output monitoring. Its architecture supports both fixed-output operation (via internal resistor divider) and adjustable-mode configuration using external feedback resistors on the FEEDBACK pin.
It implements logic-compatible shutdown (active-high, 2 V threshold), an open-collector ERROR flag that asserts low when output drops >5% below nominal, and SENSE pin for remote voltage sensing to compensate PCB trace IR drop-enabling accurate regulation at point-of-load in portable instrumentation and sensor nodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3 V ±1% over −40°C to +125°C - ensures stable MCU core or RF front-end bias across industrial temperature range |
| Dropout Voltage | 380 mV at 100 mA - enables regulation from 3.68 V input (e.g., single Li-ion cell at end-of-discharge) |
| Quiescent Current | 75 µA typical - extends battery life in always-on IoT sensors without compromising startup time |
| Line Regulation | 0.03% typical - maintains output accuracy despite input ripple or battery voltage decay |
| Load Regulation | 0.04% typical - holds output within ±1.3 mV across 100 µA–100 mA load step |
| Error Flag Threshold | 75–95 mV drop at FEEDBACK pin - triggers ERROR low at ~5% output sag (e.g., 165 mV for 3.3 V output) |
| Shutdown Input Logic | Active-high, 2 V min high-level - interfaces directly with 3.3 V GPIO without level-shifting |
Pinout & Package
The LP2951CMM-3.3 is housed in an 8-pin SOIC (D) package measuring 4.90 mm × 3.91 mm, with exposed thermal pad connected to GND (pin 4) for enhanced power dissipation.
| 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) | Remote output sense | Connects to load-side of PCB trace to cancel IR drop; enables precise point-of-load regulation |
| SHUTDOWN (Pin 3) | Enable control input | Logic-high ≥2 V disables regulator; draws ≤50 µA in shutdown mode |
| GND (Pin 4) | Ground reference | Common return for all circuits; DAP must be soldered to PCB ground plane |
| ERROR (Pin 5) | Open-collector fault indicator | Sinks 400 µA when output sags >5%; used for power-on reset or battery-low warning |
| VTAP (Pin 6) | Internal divider tap | Provides 1.235 V reference for feedback network; not user-accessible in fixed-voltage mode |
| FEEDBACK (Pin 7) | Voltage feedback input | Monitors SENSE or OUT via resistor divider; sets output in adjustable mode (not used in LP2951CMM-3.3) |
| IN (Pin 8) | Input supply | Accepts 2.3 V–30 V; dropout behavior begins when VIN < VOUT + 380 mV at 100 mA |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 3.3 V output with 0.5% initial tolerance | Eliminates external resistor network, reducing BOM count and layout area in compact designs |
| Error flag with hysteresis | Prevents chatter during marginal input conditions; 15 mV hysteresis ensures clean reset signaling |
| Stable with 2.2 µF ceramic output capacitor | Enables use of small, low-cost X7R/X5R MLCCs instead of larger tantalum or electrolytic types |
| Thermal and current limiting protection | Shuts down safely during overload or ambient overheating; foldback current limit prevents latch-up |
| −55°C to +150°C junction temperature range | Supports extended industrial and automotive under-hood applications without derating |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Continuous glucose monitor with Bluetooth LE radio operating from coin-cell battery. IC Role / Device Role / Timing Role: Primary 3.3 V supply for microcontroller and BLE transceiver, with ERROR flag triggering low-battery alert. Use Value: 75 µA quiescent current extends battery life beyond 1 year; 380 mV dropout allows operation until battery reaches 3.68 V. | Use Scenario: DIN-rail mounted analog input module powered from 24 V DC bus with local 3.3 V rail. IC Role / Device Role / Timing Role: Local LDO for ADC reference and FPGA configuration memory, using SENSE for trace-loss compensation. Use Value: Remote sensing maintains ±0.5% output accuracy despite 100 mΩ PCB trace resistance; thermal shutdown prevents field failure. |
| Smart Meter Communication Units | Automotive Body Control Modules |
Use Scenario: NB-IoT modem subsystem requiring regulated 3.3 V during burst transmission. IC Role / Device Role / Timing Role: High-accuracy LDO with SHUTDOWN controlled by host MCU to gate power during sleep cycles. Use Value: Active-high shutdown reduces system standby current to <10 µA; 0.04% load regulation prevents data corruption during RF transmit spikes. | Use Scenario: Door module with LIN transceiver and position sensors powered from vehicle battery (9–16 V). IC Role / Device Role / Timing Role: Secondary regulator for microcontroller and CAN transceiver, with ERROR flag feeding watchdog timer. Use Value: Error flag detects brownout before MCU resets, enabling graceful shutdown; −40°C to +125°C rating meets AEC-Q100 Grade 2 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV70733PDQNR | Lower quiescent current (25 µA), lower max output (200 mA), no ERROR or SENSE pins | Lacks fault reporting and remote sensing; suited for cost-sensitive, non-critical loads | Choose when minimal IQ dominates design priority and diagnostics are handled externally |
| TPS7A2033PDBVR | Higher PSRR (75 dB @ 1 kHz), 300 mA output, no ERROR/SHUTDOWN/SENSE, smaller X2SON package | No system-level monitoring features; optimized for noise-sensitive analog rails, not battery telemetry | Prefer when ultra-low noise and higher current are required, and shutdown/error functions are implemented elsewhere |
Compared with TLV70733PDQNR and TPS7A2033PDBVR, the LP2951CMM-3.3 uniquely combines integrated error detection, remote sensing, and shutdown control in a single SOIC-8 package-making it optimal for battery-powered systems where reliability, diagnostics, and board-space efficiency are jointly critical.
Availability
LP2951CMM-3.3 is available at Aetrix Electronics and suitable for portable medical devices, industrial PLC I/O modules, smart meter communication units, and automotive body control modules requiring stable component supply with long-term lifecycle support.
Supply support for LP2951CMM-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 company delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The LP2951CMM-3.3 belongs to TI's LP295x-N series of micropower LDOs, engineered specifically for battery-powered and energy-constrained applications demanding high accuracy, ultra-low IQ, and integrated system supervision features.
FAQ
What is the minimum input voltage required for LP2951CMM-3.3 to maintain regulation?
The LP2951CMM-3.3 requires a minimum input voltage of VOUT + dropout voltage. At 100 mA load, dropout is 380 mV typical, so VIN must be ≥3.68 V to sustain 3.3 V output. At light loads (100 µA), dropout drops to 50 mV, allowing operation from 3.35 V. The absolute minimum specified input is 2.3 V, but regulation cannot be maintained below the dropout threshold.
How does the ERROR pin function in LP2951CMM-3.3, and what external circuitry is needed?
The ERROR pin on LP2951CMM-3.3 is an open-collector output that pulls low when the regulated output falls >5% below 3.3 V (i.e., <3.135 V). It requires an external pull-up resistor (typically 10 kΩ to 3.3 V) to generate a logic-high signal during normal operation. This pin drives microcontroller interrupts or power-on-reset circuits without additional buffering.
Can LP2951CMM-3.3 be used with ceramic output capacitors, and what is the minimum value?
Yes, LP2951CMM-3.3 is stable with ceramic output capacitors. The minimum recommended value is 2.2 µF with ESR between 10 mΩ and 6 Ω. X7R or X5R dielectrics are preferred. Using less than 2.2 µF risks instability and oscillation, especially under dynamic load conditions.
What is the purpose of the SENSE pin on LP2951CMM-3.3, and how should it be connected?
The SENSE pin on LP2951CMM-3.3 enables remote voltage sensing at the load to compensate for voltage drop across PCB traces. It should be connected directly to the load-side of the output trace-never to the regulator's OUT pin. When SENSE is used, the regulator adjusts OUT to maintain 3.3 V precisely at the load point, improving regulation accuracy by up to 50 mV under 100 mA load.
Does LP2951CMM-3.3 require a minimum load current to maintain regulation?
No, LP2951CMM-3.3 does not require a minimum load current. It regulates stably from 0 µA to 100 mA. Unlike some older LDOs, its internal topology maintains loop stability and output accuracy even at zero load, making it suitable for intermittent-duty applications like wake-on-radio sensors.
LP2951CMM-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
LP2951CMM-3.3 FAQ
1.How can I place an order for LP2951CMM-3.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP2951CMM-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 LP2951CMM-3.3 reliable?
The price and inventory of LP2951CMM-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 LP2951CMM-3.3 is usually 5 days.
3.What payment methods are accepted for LP2951CMM-3.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP2951CMM-3.3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP2951CMM-3.3?
LP2951CMM-3.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP2951CMM-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 LP2951CMM-3.3?
For technical support, including LP2951CMM-3.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP2951CMM-3.3 requirements.
6.How does Aetrix verify that LP2951CMM-3.3 is sourced from the original manufacturer or authorized distributors?
All LP2951CMM-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 LP2951CMM-3.3 meets industry standards.
7.What is the process for return or replacement of LP2951CMM-3.3?
All LP2951CMM-3.3 units undergo pre-shipment inspection (PSI). If there is an issue with LP2951CMM-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 LP2951CMM-3.3 part is unused and in its original packaging.
Return procedure for LP2951CMM-3.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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