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Texas Instruments LP2953AIM/NOPB
- Part No.:
- LP2953AIM/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LP2953AIM/NOPB.pdf
- Description:
- IC REG LIN POS ADJ 250MA 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:148
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Product details
Overview
LP2953AIM/NOPB from Texas Instruments (formerly National Semiconductor) is an adjustable micropower low-dropout linear voltage regulator with integrated auxiliary comparator and error flag output. It delivers up to 250 mA output current, features 130 µA typical quiescent current at 1 mA load, 470 mV dropout at full load, and a 1.23 V internal reference for precise external voltage programming - ideal for battery-powered instrumentation and portable medical devices.
For engineers reviewing the LP2953AIM/NOPB datasheet, LP2953AIM/NOPB pinout, LP2953AIM/NOPB application, or LP2953AIM/NOPB equivalent, key selection considerations include its dual-comparator architecture (dropout detection + auxiliary), reverse-battery protection, CMOS/TTL-compatible open-collector outputs, and guaranteed operation across −40°C to +125°C industrial temperature range.
Technical Context
The LP2953AIM/NOPB integrates two independent comparators: one monitors output regulation status (error flag) with ~5% trip threshold referenced to VREF, and a second auxiliary comparator with externally accessible inputs enables flexible fault detection or low-input-line sensing. Both comparators feature open-collector outputs with 400 µA sink capability and ±3 mV input offset.
Its LDO architecture uses a PNP pass transistor with internal crowbar circuitry that pulls output down rapidly during shutdown. The regulator supports adjustable output from 1.23 V to 29 V via external resistor divider, with feedback bias current of only 20 nA typical - minimizing divider-induced error and enabling high-impedance programming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Guaranteed 250 mA - sufficient for powering microcontrollers, sensors, and analog front-ends without external boost stages. |
| Quiescent Current | 130 µA typical at 1 mA load - extends battery life in always-on monitoring systems. |
| Dropout Voltage | 470 mV at 250 mA - enables regulation from single-cell Li-ion (3.0 V min) down to 2.53 V output. |
| Reference Voltage | 1.230 V ±15 mV - stable low-TC reference (20 ppm/°C) usable as precision external voltage source. |
| Line Regulation | 0.03% typical - ensures <±1.5 mV output shift over 2.5 V to 30 V input range. |
| Load Regulation | 0.04% typical (1–250 mA) - maintains tight output stability under dynamic load conditions. |
| Error Flag Threshold | ~5% output drop - triggers logic-low signal when VOUT falls below regulation, independent of programmed output voltage. |
Pinout & Package
LP2953AIM/NOPB is housed in a 16-pin SOIC (Small Outline Integrated Circuit) package with exposed thermal pad (M16A drawing), optimized for surface-mount assembly and board-level heat dissipation via ground pins 1, 8, 9, and 16.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 8, 9, 16 | Ground | Primary thermal conduction path and return for regulator, comparators, and shutdown logic. |
| 2 | Input | Main power input (−20 V to +30 V absolute max); reverse-battery protected. |
| 3 | Output | Regulated output; internally connected to Output Sense pin in default configuration. |
| 4 | Shutdown | Active-low TTL/CMOS-compatible control; <1.2 V disables regulator and activates crowbar. |
| 5 | Feedback | Connects to external resistor divider; 20 nA bias current enables high-Z programming. |
| 6 | Error Flag | Open-collector output signaling dropout; sinks 400 µA, requires external pull-up. |
| 7 | Auxiliary Comp In+ | Non-inverting input of secondary comparator; externally accessible for custom threshold sensing. |
| 10 | Auxiliary Comp Out | Open-collector output of auxiliary comparator; electrically identical to Error Flag pin. |
| 11 | VTAP | Internal 5 V tap point; used for pin-strapped 5 V mode or as auxiliary reference node. |
| 12, 13, 14, 15 | NC / Reserved | No internal connection; must be left unconnected per datasheet guidance. |
Key Features
| Feature | Design Value |
|---|---|
| Dual comparator architecture | Separate dropout detection and user-configurable auxiliary comparator enable simultaneous fault monitoring and system-level supervision. |
| Reverse battery protection | Prevents damage when input polarity is inverted - critical for field-serviceable battery compartments. |
| Internal crowbar circuit | Pulls output low within microseconds during shutdown, eliminating residual voltage holdup in safety-critical circuits. |
| Low-T.C. reference output | 1.23 V reference with 20 ppm/°C drift and 0.25% load regulation - usable as precision ADC reference or sensor excitation source. |
| Adjustable output range | 1.23 V to 29 V via two-resistor divider - supports diverse rail requirements without redesigning power architecture. |
Applications
| Battery-Powered Instrumentation | Portable Medical Sensors |
|---|---|
Use Scenario: Handheld blood glucose meter operating from single AA alkaline cell with 10-year shelf life requirement. IC Role / Device Role / Timing Role: Primary LDO supplying 3.3 V to MCU and analog sensor interface; auxiliary comparator monitors battery voltage decay. Use Value: 130 µA quiescent current minimizes standby drain; 470 mV dropout allows full regulation until cell drops to 2.53 V. | Use Scenario: Wearable ECG patch requiring ultra-low-noise 2.5 V analog supply and low-battery alert before disconnect. IC Role / Device Role / Timing Role: Adjustable regulator set to 2.5 V; error flag signals imminent power loss; reference pin feeds precision DAC. Use Value: 1.23 V reference with 20 ppm/°C TC ensures stable sensor excitation; dual comparators support independent battery and output health monitoring. |
| Industrial Data Loggers | Smart Utility Meters |
Use Scenario: Remote environmental logger powered by Li-SOCl₂ battery with 15-year operational life. IC Role / Device Role / Timing Role: Main regulator with shutdown controlled by microcontroller; auxiliary comparator detects brownout on backup supercapacitor. Use Value: Reverse-battery protection prevents field-reverse installation damage; crowbar ensures clean power-down during firmware updates. | Use Scenario: AMI meter with dual-supply architecture: 3.3 V for RF transceiver and 1.8 V for metrology ASIC. IC Role / Device Role / Timing Role: Primary 3.3 V regulator; feedback pin used to generate 1.8 V via resistor divider and external op-amp buffer. Use Value: 20 nA feedback bias current avoids loading divider network; tight line/load regulation maintains RF stability across wide input voltage swings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS7A4700RGWR | Lower noise (4.7 µV RMS), higher PSRR (70 dB), but 1 mA quiescent current - 8× higher than LP2953AIM/NOPB. | Preferred for ultra-low-noise analog rails; unsuitable for multi-year battery life designs. | Select when noise performance outweighs battery longevity; verify thermal design for 250 mA continuous load. |
| MCP1826T-3302E/OT | Fixed 3.3 V output only; no auxiliary comparator; 65 µA quiescent current; 350 mV dropout at 250 mA. | Limited to fixed-voltage use cases; lacks supervision capability for system-level fault response. | Choose for cost-sensitive, single-rail embedded applications where programmability and dual-comparator features are unnecessary. |
Compared with TPS7A4700RGWR and MCP1826T-3302E/OT, LP2953AIM/NOPB uniquely balances micropower operation, adjustable output, and dual-comparator supervision - making it optimal for long-life, intelligent battery-powered systems requiring both power regulation and autonomous fault awareness.
Availability
LP2953AIM/NOPB is available at Aetrix Electronics and suitable for battery-powered instrumentation, portable medical sensors, industrial data loggers, smart utility meters, and handheld test equipment requiring stable component supply across extended product lifecycles.
Supply support for LP2953AIM/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 acquired National Semiconductor in 2011 and maintains full technical and manufacturing continuity for legacy precision analog products.
The LP2953AIM/NOPB belongs to TI's industrial-grade LDO family designed specifically for ultra-low-power, high-reliability applications in harsh environments - emphasizing long-term stability, reverse-polarity resilience, and integrated system supervision.
FAQ
What is the maximum input voltage rating for LP2953AIM/NOPB?
The LP2953AIM/NOPB has an absolute maximum input voltage rating of +30 V and a minimum of −20 V, with reverse-battery protection active across this full range. Operation above 30 V risks permanent damage; sustained input above 29 V is not recommended even within absolute max limits due to thermal stress and reliability degradation.
Does LP2953AIM/NOPB support fixed-output configurations without external resistors?
Yes, LP2953AIM/NOPB supports pin-strapped 5 V operation by connecting Output to Output Sense and Feedback to 5 V Tap pins - using its internal resistor divider. It does not support fixed 3.3 V or other voltages without external components; those require external feedback networks per the datasheet Figure 4 configuration.
How does the auxiliary comparator in LP2953AIM/NOPB differ from the error flag comparator?
The auxiliary comparator in LP2953AIM/NOPB has its inverting input tied to the 1.23 V reference and non-inverting input brought out to Pin 7, enabling user-defined threshold detection. The error flag comparator monitors the feedback node directly and triggers at ~5% output deviation - it is not configurable and serves only regulation-status reporting.
What output capacitor value is required for stable 3.3 V operation with LP2953AIM/NOPB?
For stable 3.3 V operation, LP2953AIM/NOPB requires a minimum 4.7 µF output capacitor (tantalum or low-ESR aluminum electrolytic). Using less capacitance risks oscillation; increasing to 6.8 µF or more improves noise rejection and transient response, especially when pairing with the optional 0.1 µF R1 bypass capacitor.
Can LP2953AIM/NOPB operate with zero load current?
LP2953AIM/NOPB can maintain regulation with no load, but the datasheet specifies a minimum 1 µA current through the feedback resistor divider to ensure correlation with tested electrical characteristics. Operating with open feedback or excessively high divider resistance may cause instability or inaccurate output voltage due to 20 nA feedback bias current effects.
LP2953AIM/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Adjustable (Fixed)
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 30V
- Voltage - Output (Min/Fixed):
- 1.23V (5V)
- Voltage - Output (Max):
- 29V
- Voltage Dropout (Max):
- 0.8V @ 250mA
- Current - Output:
- 250mA
- Current - Quiescent (Iq):
- 170 µA
- Current - Supply (Max):
- 33 mA
- PSRR:
- -
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Reverse Polarity
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
LP2953AIM/NOPB FAQ
1.How can I place an order for LP2953AIM/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP2953AIM/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 LP2953AIM/NOPB reliable?
The price and inventory of LP2953AIM/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP2953AIM/NOPB is usually 5 days.
3.What payment methods are accepted for LP2953AIM/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP2953AIM/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP2953AIM/NOPB?
LP2953AIM/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP2953AIM/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 LP2953AIM/NOPB?
For technical support, including LP2953AIM/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP2953AIM/NOPB requirements.
6.How does Aetrix verify that LP2953AIM/NOPB is sourced from the original manufacturer or authorized distributors?
All LP2953AIM/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 LP2953AIM/NOPB meets industry standards.
7.What is the process for return or replacement of LP2953AIM/NOPB?
All LP2953AIM/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP2953AIM/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 LP2953AIM/NOPB part is unused and in its original packaging.
Return procedure for LP2953AIM/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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