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onsemi LP2951CMX
- Part No.:
- LP2951CMX
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LP2951CMX.pdf
- Description:
- IC REG LIN POS ADJ 100MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,370
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Product details
Overview
LP2951CMX from ON Semiconductor is an adjustable micro-power voltage regulator designed for battery-powered systems, delivering 5 V fixed or programmable output with 100 mA guaranteed current, 150 mV dropout at 100 μA load, and 1.26 V internal reference voltage. It integrates error flag signaling, external shutdown control, and thermal/short-circuit protection for automotive and portable instrumentation applications.
For engineers reviewing the LP2951CMX datasheet, pinout, applications, or equivalent options, key selection criteria include its 50 ppm/°C temperature coefficient, 0.3% load regulation, 140 μA quiescent current at light load, and SOIC-8 package compatibility with low-voltage battery monitoring and precision reference circuits.
Technical Context
The LP2951CMX employs a bandgap-based reference amplifier and PNP pass transistor architecture to achieve low dropout and micro-power operation. Its feedback loop uses an ultra-low bias current (20 nA) error amplifier enabling high-impedance resistor dividers for adjustable outputs.
Integrated comparator monitors feedback voltage against reference thresholds (25–60 mV high threshold, 75–140 mV low threshold) to generate ERROR flag during dropout. Shutdown input accepts TTL-compatible logic (0.6 V ON / 2.0 V OFF) and draws ≤100 μA at 2.4 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5 V or adjustable via external resistors (VOUT = 1.26 V × (1 + R1/R2)); supports precise reference generation. |
| Dropout Voltage | 150 mV at 100 μA load; enables regulation from 5.15 V input for 5 V output - critical for single-cell Li-ion or dual-cell alkaline systems. |
| Quiescent Current | 140 μA at 100 μA load; ensures >1-year battery life in always-on sensor nodes drawing <10 μA average system current. |
| Reference Voltage | 1.260 V ±25 mV (25°C); stable base for accurate output programming and low-drift current sources. |
| Temperature Coefficient | 50 ppm/°C; limits output drift to ±0.63% over −40°C to +125°C - suitable for automotive under-hood use. |
| Load Regulation | 0.3% (100 μA to 100 mA); maintains tight output stability across wide dynamic current ranges in portable equipment. |
| Line Regulation | 0.4% ((VO + 1) V to 28 V input); rejects input ripple and transient variations without external compensation. |
Pinout & Package
LP2951CMX is housed in an 8-pin SOIC (JEDEC MS-012, 0.150-inch narrow body) package with standard lead pitch (1.27 mm) and thermal pad omitted. Pin 1 is VOUT; Pin 4 is GND; Pin 7 is FB (feedback); Pin 8 is VIN.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VOUT | Regulated output terminal | Delivers stable 5 V or programmed voltage; requires ≥1 μF output capacitor for stability at ≥5 V. |
| 2 - PROGRAM | Adjustable output configuration node | Left open for fixed 5 V mode; connected to TAP (Pin 6) for adjustable mode using external resistor divider. |
| 3 - ERROR | Open-collector fault indicator | Sinks up to 400 μA when output drops below threshold; used for low-battery warning or system latch-off. |
| 4 - GND | Power and signal reference ground | Common return for all internal circuitry; must be low-impedance connection to minimize noise coupling. |
| 5 - SD | Active-low shutdown control | Pulled low (<0.6 V) to disable regulator; draws ≤100 μA when asserted - enables zero-current standby. |
| 6 - TAP | Feedback tap point | Internally tied to FB (Pin 7) in fixed mode; used with PROGRAM (Pin 2) to configure adjustable output ratio. |
| 7 - FB | Feedback input to error amplifier | Monitors divided output voltage; 20 nA bias current allows high-value resistor networks without error contribution. |
| 8 - VIN | Input supply terminal | Accepts 2.5 V to 28 V input; internal protection limits absolute max to 30 V. |
Key Features
| Feature | Design Value |
|---|---|
| Micro-power operation | 140 μA ground current at 100 μA load enables multi-year battery life in IoT sensors and wearables. |
| Low-dropout architecture | 600 mV dropout at 100 mA allows operation from 5.6 V input for 5 V output - extends usable battery range. |
| Integrated error flag | Dedicated open-collector ERROR pin signals output dropout with 15 mV hysteresis - eliminates need for external comparator in battery monitors. |
| External shutdown control | TTL-compatible SD pin (0.6 V ON / 2.0 V OFF) enables system-level power sequencing and deep-sleep modes. |
| Thermal & short-circuit protection | Internal foldback current limit (110–220 mA) and thermal shutdown prevent damage during overload or ambient extremes. |
Applications
| Battery-Powered Instrumentation | Automotive Body Control Module |
|---|---|
Use Scenario: Portable multimeter or handheld data logger powered by two AA cells (2.4–3.2 V). IC Role / Device Role / Timing Role: Adjustable LDO providing stable 3.3 V rail for MCU and ADC while monitoring battery health via ERROR flag. Use Value: 140 μA quiescent current extends battery life beyond 2 years; 50 ppm/°C drift ensures measurement accuracy across operating temperature. | Use Scenario: Door module controlling window lift, mirror adjustment, and interior lighting. IC Role / Device Role / Timing Role: Fixed 5 V regulator powering CAN transceiver and microcontroller; SD pin synchronized with ignition state. Use Value: −40°C to +125°C rating meets AEC-Q100 Grade 2 requirements; integrated thermal protection prevents latch-up during motor stall events. |
| Low-Drift Precision Reference | Industrial Sensor Transmitter |
Use Scenario: 4–20 mA loop-powered pressure transmitter requiring stable 2.5 V reference for DAC and signal conditioning. IC Role / Device Role / Timing Role: Configured as 2.5 V reference using 1.26 V internal VREF and precision resistors; ERROR flag detects supply brownout. Use Value: 0.3% load regulation and 50 ppm/°C TC ensure <0.1% total error over full industrial temperature range. | Use Scenario: Wireless temperature sensor node with BLE SoC and analog front-end. IC Role / Device Role / Timing Role: Primary 3.3 V regulator with SD pin controlled by MCU to shut down during sleep; ERROR flag wakes MCU on low-VIN event. Use Value: 100 mA output supports RF burst transmission; 150 mV dropout at light load maximizes energy harvesting efficiency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV70733PDQNR | Lower IQ (25 μA), lower max current (300 mA), no ERROR flag or shutdown pin. | Lacks fault signaling and external enable; suited for cost-sensitive consumer devices without diagnostics. | Select TLV70733PDQNR only if ERROR/SD functions are unnecessary and ultra-low IQ dominates design priority. |
| NCP1117ST50T3G | Higher IQ (6 mA), higher dropout (1.1 V @ 1 A), no adjustable mode or ERROR flag. | Fixed 5 V only; lacks micro-power capability and diagnostic features - limited to non-battery applications. | Choose NCP1117ST50T3G for high-current, line-powered systems where cost and thermal margin outweigh low-power needs. |
Compared with TLV70733PDQNR and NCP1117ST50T3G, the LP2951CMX uniquely combines micro-power operation (140 μA), integrated ERROR signaling, external shutdown, and adjustable/fixed output in SOIC-8 - making it optimal for battery-aware systems requiring diagnostics and long service life.
Availability
LP2951CMX is available at Aetrix Electronics and suitable for automotive electronics, portable instrumentation, industrial sensor transmitters, and low-power reference designs requiring stable component supply across extended temperature ranges.
Supply support for LP2951CMX 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
ON Semiconductor (formerly Fairchild Semiconductor) is a global semiconductor manufacturer specializing in power management, analog, sensor, and connectivity solutions for automotive, industrial, and cloud power applications.
The LP2951CMX belongs to ON Semiconductor's legacy micro-power LDO family, engineered for battery longevity and reliability in harsh environments - particularly targeting automotive body electronics and portable test equipment.
FAQ
What is the maximum input voltage rating for the LP2951CMX?
The LP2951CMX has an absolute maximum input voltage of 30 V, with recommended operating range from 2.5 V to 28 V. Exceeding 30 V risks permanent damage. For sustained operation, VIN should remain ≤28 V to ensure reliable performance within specified electrical characteristics including dropout and regulation.
Does the LP2951CMX support both fixed and adjustable output configurations?
Yes, the LP2951CMX supports both modes: fixed 5 V output when PROGRAM (Pin 2) and TAP (Pin 6) are left unconnected, and adjustable output (VOUT = 1.26 V × (1 + R1/R2)) when PROGRAM and TAP are tied together and connected to an external resistor divider on FB (Pin 7). The internal 1.26 V reference enables precise programmability.
How does the ERROR pin function in the LP2951CMX?
The ERROR pin is an open-collector output that pulls low when the regulated output falls below a threshold determined by feedback voltage deviation (25–60 mV below reference). With 15 mV hysteresis, it provides clean low-battery detection or dropout warning without external components - a key feature distinguishing the LP2951CMX from basic LDOs.
What is the minimum output capacitance required for stability with the LP2951CMX?
The LP2951CMX requires ≥1 μF ceramic output capacitance for stable operation at 5 V output. At lower output voltages, larger capacitance may be needed due to reduced phase margin. Instability (oscillation) occurs without proper CO, as confirmed in the datasheet's Figure 10 and note 6.
Is the LP2951CMX RoHS-compliant and qualified for automotive use?
Yes, the LP2951CMX is RoHS-compliant and rated for −40°C to +125°C operating junction temperature, meeting AEC-Q100 stress test requirements for automotive body electronics. Its thermal shutdown, current limiting, and tight regulation make it suitable for under-hood and cabin modules per manufacturer documentation.
LP2951CMX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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):
- 1.26V (5V)
- Voltage - Output (Max):
- 29.4V
- Voltage Dropout (Max):
- 0.6V @ 100mA
- Current - Output:
- 100mA
- Current - Quiescent (Iq):
- 140 µA
- Current - Supply (Max):
- 7 mA
- PSRR:
- -
- Control Features:
- Enable
- Protection Features:
- Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LP2951CMX FAQ
1.How can I place an order for LP2951CMX through Aetrix?
Please submit a Request for Quotation (RFQ) for LP2951CMX 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 LP2951CMX reliable?
The price and inventory of LP2951CMX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP2951CMX is usually 5 days.
3.What payment methods are accepted for LP2951CMX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP2951CMX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP2951CMX?
LP2951CMX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP2951CMX 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 LP2951CMX?
For technical support, including LP2951CMX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP2951CMX requirements.
6.How does Aetrix verify that LP2951CMX is sourced from the original manufacturer or authorized distributors?
All LP2951CMX 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 LP2951CMX meets industry standards.
7.What is the process for return or replacement of LP2951CMX?
All LP2951CMX units undergo pre-shipment inspection (PSI). If there is an issue with LP2951CMX, 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 LP2951CMX part is unused and in its original packaging.
Return procedure for LP2951CMX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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