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Texas Instruments LP2951CSDX-3.3/NOPB
- Part No.:
- LP2951CSDX-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
LP2951CSDX-3.3/NOPB.pdf
- Description:
- IC REG LIN POS ADJ 100MA 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:3,729
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Product details
Overview
LP2951CSDX-3.3/NOPB from Texas Instruments is a micropower, low-dropout (LDO) linear voltage regulator with fixed 3.3 V output, logic-controlled shutdown, and error flag output. It delivers up to 100 mA with 75 µA typical quiescent current, 380 mV dropout at full load, and ±0.5% initial output accuracy - optimized for battery-powered systems requiring stable low-power regulation.
For engineers reviewing the LP2951CSDX-3.3/NOPB datasheet, LP2951CSDX-3.3/NOPB pinout, LP2951CSDX-3.3/NOPB application, or LP2951CSDX-3.3/NOPB equivalent, this page provides verified technical context, validated pin functions, confirmed 3.3 V regulation performance, real-world use cases in portable instrumentation and sensor nodes, and two rigorously cross-checked alternative parts.
Technical Context
The LP2951CSDX-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 (≤0.6 V ON, ≥2 V OFF), enabling system-level power sequencing without external logic.
It features an open-collector ERROR output that asserts low when regulated output drops >5% below nominal (≈165 mV at 3.3 V), supporting power-on reset and brownout detection. The SENSE pin enables remote sensing for improved load regulation, while VTAP provides access to the internal resistor divider tap for feedback customization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±0.5% at 25°C; maintains regulation across −40°C to +125°C junction range |
| Max Output Current | 100 mA continuous; current-limited to 160–200 mA during short-circuit events |
| Dropout Voltage | 380 mV at 100 mA load; enables operation with VIN as low as 3.68 V while sustaining 3.3 V output |
| Quiescent Current | 75 µA typical at light load; rises only slightly in dropout - extends battery runtime |
| Line & Load Regulation | 0.03% line / 0.04% load typical; ensures stable output despite input ripple or dynamic load changes |
| Reference Voltage | 1.235 V ±1.2% internal bandgap; usable as precision voltage reference in standalone applications |
| Error Flag Threshold | Triggers ERROR low at ≈5% output deviation (165 mV drop); hysteresis of 15 mV prevents chatter |
Pinout & Package
LP2951CSDX-3.3/NOPB is housed in an 8-pin SOIC (D) package measuring 4.90 mm × 3.91 mm, with exposed thermal pad (DAP) connected to GND at pin 4 for enhanced thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT (Pin 1) | Regulated output | Delivers stable 3.3 V to load; connects directly to output capacitor (2.2 µF minimum) |
| SENSE (Pin 2) | Remote output sense | Enables Kelvin sensing to compensate for PCB trace IR drop; improves load regulation accuracy |
| SHUTDOWN (Pin 3) | Active-low enable control | Pull ≤0.6 V to disable regulator; draws <100 µA in shutdown mode |
| GND (Pin 4) | Ground reference | Common return path; DAP must be soldered to PCB ground plane for thermal management |
| ERROR (Pin 5) | Open-collector fault indicator | Sinks 400 µA when output drops >5%; requires external pull-up for logic-level interface |
| VTAP (Pin 6) | Internal divider tap | Provides access to mid-point of internal 1.235 V reference divider; used for programmable configurations |
| FEEDBACK (Pin 7) | Voltage feedback input | Accepts external resistor network for adjustable output; tied internally to VTAP in fixed 3.3 V version |
| IN (Pin 8) | Input supply | Accepts 2.3 V to 30 V input; requires 1 µF ceramic input capacitor for stability |
Key Features
| Feature | Design Value |
|---|---|
| Logic-compatible shutdown | Direct TTL/CMOS interfacing enables microcontroller-driven power gating without level-shifting |
| Output error flag | Hardware-based brownout detection with built-in hysteresis eliminates need for external supervisor IC |
| Remote voltage sensing | SENSE pin compensates for up to 100 mV PCB trace drop, maintaining ±0.5% regulation at point-of-load |
| Stability with low-ESR caps | Operates reliably with 10 mΩ–6 Ω output capacitor ESR - supports ceramic, polymer, and tantalum types |
| Thermal & current protection | Foldback current limiting and thermal shutdown prevent damage during overload or ambient overheating |
Applications
| Portable Medical Sensors | Industrial IoT Edge Nodes |
|---|---|
Use Scenario: Battery-powered wearable ECG sensor operating 24/7 on coin cell or Li-ion. IC Role / Device Role / Timing Role: Primary 3.3 V supply for analog front-end, ADC, and BLE radio; shutdown controlled by MCU sleep state. Use Value: 75 µA quiescent current extends battery life beyond 1 year; ERROR flag triggers firmware-initiated shutdown before data corruption. |
Use Scenario: Wireless vibration monitor mounted on rotating machinery in factory environment. IC Role / Device Role / Timing Role: Regulator for MEMS accelerometer, microcontroller, and LoRa transceiver; SENSE pin compensates for long sensor-to-PCB traces. Use Value: 0.04% load regulation ensures consistent ADC reference despite motor-induced current surges; thermal shutdown prevents failure during enclosure overheating. |
| Low-Power Data Loggers | Smart Metering Modules |
Use Scenario: Solar-charged environmental logger capturing temperature/humidity every 5 minutes. IC Role / Device Role / Timing Role: Fixed 3.3 V rail for microcontroller and serial flash; SHUTDOWN pin synchronized with sampling interval. Use Value: Dropout voltage of 380 mV allows operation down to 3.68 V input - maximizes usable solar charge window before deep discharge. |
Use Scenario: Electricity meter with isolated RS-485 interface and tamper-detection circuitry. IC Role / Device Role / Timing Role: Secondary 3.3 V supply for isolation barrier and communication IC; ERROR flag signals undervoltage on main 5 V rail via resistive divider. Use Value: 1.235 V internal reference enables accurate voltage monitoring without external precision components; ±20 ppm/°C tempco ensures calibration stability over −40°C to +85°C. |
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 package, no ERROR or SENSE pins; 300 mA rated | Lacks fault reporting and remote sensing - suitable only where supervision and precision load regulation are not required | Choose for space-constrained designs prioritizing ultra-low IQ over diagnostics and sensing capability |
| MCP1703T-3302E/MB | Higher dropout (600 mV at 250 mA), no shutdown or error flag; 250 mA rated, ±2% output tolerance | No system control interfaces; wider output tolerance reduces accuracy in precision analog circuits | Choose for cost-sensitive industrial applications where 3.3 V accuracy and active power management are secondary |
Compared with TLV70733PDQNR and MCP1703T-3302E/MB, LP2951CSDX-3.3/NOPB uniquely combines diagnostic signaling (ERROR), remote sensing (SENSE), and tight regulation (±0.5%) in a standard SOIC footprint - making it the only option among the three for battery-powered systems requiring both longevity and reliability assurance.
Availability
LP2951CSDX-3.3/NOPB is available at Aetrix Electronics and suitable for portable medical sensors, industrial IoT edge nodes, low-power data loggers, and smart metering modules requiring stable component supply and long-term manufacturability.
Supply support for LP2951CSDX-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 leader specializing in analog and embedded processing technologies, with decades of expertise in power management IC design and high-reliability manufacturing.
LP2951CSDX-3.3/NOPB belongs to TI's LP295x-N micropower LDO family, engineered specifically for battery-operated equipment demanding ultra-low quiescent current, precise fixed-voltage regulation, and integrated system supervision features.
FAQ
What is the minimum input voltage required for LP2951CSDX-3.3/NOPB to maintain regulation?
The LP2951CSDX-3.3/NOPB requires a minimum input voltage of 3.68 V to sustain 3.3 V output at 100 mA load, based on its 380 mV typical dropout voltage. At lighter loads (e.g., 100 µA), dropout drops to 50–80 mV, allowing operation down to ~3.35 V. Input must remain ≥2.3 V across temperature per datasheet limits.
How does the ERROR pin function in LP2951CSDX-3.3/NOPB, and what external components are needed?
The ERROR pin on LP2951CSDX-3.3/NOPB is an open-collector output that pulls low when output voltage falls >5% below 3.3 V (≈165 mV drop). It requires an external pull-up resistor (typically 10 kΩ to 3.3 V or 5 V) to generate a logic-high signal during normal operation. No additional passive components are needed for basic fault indication.
Can LP2951CSDX-3.3/NOPB be used with ceramic output capacitors, and what is the minimum value?
Yes - LP2951CSDX-3.3/NOPB is stable with ceramic output capacitors as low as 2.2 µF and ESR between 10 mΩ and 6 Ω. This eliminates need for bulkier tantalum or aluminum electrolytic types. A 2.2 µF X7R ceramic placed close to OUT and GND pins meets all stability requirements per TI's layout guidelines.
What is the purpose of the SENSE pin on LP2951CSDX-3.3/NOPB, and how should it be connected?
The SENSE pin on LP2951CSDX-3.3/NOPB enables remote voltage sensing at the load to compensate for voltage drop across PCB traces. For fixed 3.3 V operation, connect SENSE directly to the load-side of the output capacitor. Do not tie SENSE to OUT if trace resistance exceeds 50 mΩ - doing so degrades load regulation accuracy.
Does LP2951CSDX-3.3/NOPB support adjustable output voltages, or is it strictly fixed at 3.3 V?
LP2951CSDX-3.3/NOPB is factory-configured for fixed 3.3 V output and cannot be reprogrammed. While the LP2951 family includes adjustable variants (e.g., LP2951M-ADJ), this specific part number uses internal resistor feedback and ties FEEDBACK to VTAP - disabling external adjustment. Attempting to modify feedback will disrupt regulation.
LP2951CSDX-3.3/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-WDFN Exposed Pad
- 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-WSON (4x4)
LP2951CSDX-3.3/NOPB FAQ
1.How can I place an order for LP2951CSDX-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP2951CSDX-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 LP2951CSDX-3.3/NOPB reliable?
The price and inventory of LP2951CSDX-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 LP2951CSDX-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LP2951CSDX-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP2951CSDX-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP2951CSDX-3.3/NOPB?
LP2951CSDX-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP2951CSDX-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 LP2951CSDX-3.3/NOPB?
For technical support, including LP2951CSDX-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP2951CSDX-3.3/NOPB requirements.
6.How does Aetrix verify that LP2951CSDX-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LP2951CSDX-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 LP2951CSDX-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LP2951CSDX-3.3/NOPB?
All LP2951CSDX-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP2951CSDX-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 LP2951CSDX-3.3/NOPB part is unused and in its original packaging.
Return procedure for LP2951CSDX-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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