My Inquiry
My Account
Texas Instruments LP2951-33DRG4
- Part No.:
- LP2951-33DRG4
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LP2951-33DRG4.pdf
- Description:
- IC REG LIN POS ADJ 100MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,797
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LP2951-33DRG4 from Texas Instruments is a fixed 3.3V, 100mA low-dropout linear regulator in an 8-pin WSON (DRG) package, featuring ±1% output accuracy over –40°C to 125°C, 340mV typical dropout at 100mA, and integrated shutdown and error monitoring. It delivers stable power for industrial control modules requiring precise voltage regulation under wide input (2V–30V) and thermal conditions.
For engineers reviewing the LP2951-33DRG4 datasheet, LP2951-33DRG4 pinout, LP2951-33DRG4 application, or LP2951-33DRG4 equivalent, key selection criteria include its 3.3V fixed output with active-low ERROR flag, SHUTDOWN enable logic, thermal shutdown, and compatibility with 1μF–100μF ceramic output capacitors without ESR constraints.
Technical Context
The LP2951-33DRG4 implements a precision bandgap reference (1.20V typ) and error amplifier to regulate output via internal feedback tied between FEEDBACK and VTAP pins, with OUTPUT and SENSE shorted for fixed-voltage operation. Its ERROR comparator monitors VFB and asserts low when output drops >6% below nominal.
Shutdown is controlled by an active-high SHUTDOWN input that reduces quiescent current to ≤6μA; the device supports sequencing in multi-rail systems. Thermal regulation is limited to 0.2%/W, and it operates reliably across –40°C to 125°C junction temperature with no minimum load requirement.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | Fixed 3.3V ±1% over line, load, and temperature - ensures stable MCU core or sensor bias supply without external resistors. |
| Max output current | 100mA - sufficient for microcontrollers, ADCs, and small logic circuits in space-constrained industrial nodes. |
| Dropout voltage | 340mV typical at 100mA - enables regulation from 3.64V input, critical for battery-backed or low-VIN applications. |
| Quiescent current | 50μA typical - minimizes standby power loss in always-on systems like smart sensors or remote I/O. |
| Input voltage range | 2V to 30V - accommodates unregulated 3.3V, 5V, 12V, and 24V rails common in factory automation and grid infrastructure. |
| Operating temperature | –40°C to 125°C - qualified for under-hood automotive auxiliary supplies and industrial motor drive control boards. |
| Output capacitor support | 1μF to 100μF ceramic, 0–2Ω ESR - eliminates need for tantalum or electrolytic caps, reducing BOM cost and board area. |
Pinout & Package
LP2951-33DRG4 uses an 8-pin WSON (DRG) package measuring 3.00mm × 3.00mm with exposed thermal pad. Pin 1 is marked by a dot; pin numbering follows standard top-view orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| INPUT (Pin 8) | Power input | Accepts 2V–30V supply; requires ≥1μF bypass capacitor to GND for stability and noise rejection. |
| OUTPUT (Pin 1) | Regulated output | Delivers 3.3V/100mA; connects directly to load and output capacitor; ties to SENSE for fixed-output mode. |
| SENSE (Pin 2) | Output voltage sense | Internally connected to OUTPUT in fixed mode; must be left floating for adjustable configurations. |
| SHUTDOWN (Pin 3) | Enable control | Active-high logic input; drives regulator into ultra-low-IQ shutdown state (<6μA) when pulled ≥2V. |
| GND (Pin 4) | Ground reference | Primary return path for load, input cap, and internal circuitry; connects to thermal pad for thermal performance. |
| ERROR (Pin 5) | Open-drain fault flag | Asserts low when VOUT drops >6% (≈198mV at 3.3V); requires external pull-up for system-level monitoring or sequencing. |
| FEEDBACK (Pin 7) | Voltage regulation node | Tied to VTAP internally for 3.3V fixed output; used with external divider only in adjustable variants. |
| VTAP (Pin 6) | Internal divider tap | Connected to FEEDBACK for fixed output; left floating in adjustable mode; not user-accessible in LP2951-33DRG4 configuration. |
Key Features
| Feature | Design Value |
|---|---|
| ±1% output accuracy over full temp/load range | Enables direct powering of 3.3V I/O interfaces and analog front-ends without post-regulation trimming. |
| 340mV dropout at 100mA | Permits operation from single-cell LiFePO4 (3.6V min) or degraded 5V rails while maintaining regulation. |
| 50μA quiescent current (typ) | Extends battery life in wireless sensor nodes where sleep-mode current dominates energy budget. |
| Stable with 1μF–100μF ceramic capacitors | Eliminates ESR dependency, simplifies layout, and improves reliability versus electrolytic/tantalum alternatives. |
| Integrated ERROR and SHUTDOWN pins | Supports power sequencing and fault reporting in multi-supply systems without external comparators or logic. |
Applications
| Industrial PLC I/O Module | Smart Grid Sensor Node |
|---|---|
Use Scenario: Powering isolated analog input channels and digital isolators in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Primary 3.3V LDO supplying ADC reference, microcontroller I/O, and optocoupler LEDs. Use Value: ±1% accuracy ensures consistent 12-bit ADC full-scale range; 125°C rating allows placement near heat-generating power stages. | Use Scenario: Regulating power for RF transceivers and environmental sensors in outdoor electricity metering units. IC Role / Device Role / Timing Role: Fixed 3.3V supply for LoRaWAN or NB-IoT modems and precision temperature/humidity ICs. Use Value: 340mV dropout extends operational time during brownout events on solar-charged batteries; ERROR pin triggers firmware fault logging. |
| Motor Drive Control Board | Building Automation Controller |
Use Scenario: Providing clean 3.3V bias to gate drivers, current-sense amplifiers, and position encoder interfaces in variable-frequency drives. IC Role / Device Role / Timing Role: Secondary regulated rail decoupled from noisy 12V/24V motor bus. Use Value: Low noise (265μV RMS) prevents interference with high-resolution current sensing; thermal shutdown protects during overload faults. | Use Scenario: Supplying HVAC controller microcontrollers and CAN transceivers in centralized building management systems. IC Role / Device Role / Timing Role: Main 3.3V regulator enabling low-power sleep modes and wake-on-CAN functionality. Use Value: 50μA quiescent current meets EN 50160 standby requirements; SHUTDOWN pin synchronizes with system power-down sequence. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV70733PDQNR | Lower 25μA IQ, 200mA output, but only rated to 85°C ambient and lacks ERROR pin. | Suitable for consumer-grade portable devices, not industrial environments requiring extended temperature or fault signaling. | Select when ultra-low IQ and higher current are prioritized over fault monitoring and 125°C operation. |
| TPS7A2033PDBVR | 25μA IQ, 300mA output, ±0.5% accuracy, but no SHUTDOWN or ERROR pins; requires external enable logic. | Better for space-constrained designs needing higher current and tighter accuracy, but adds complexity for sequencing or fault response. | Choose when maximum efficiency and output capability outweigh integrated control features and extended temperature compliance. |
Compared with TLV70733PDQNR and TPS7A2033PDBVR, the LP2951-33DRG4 uniquely combines industrial temperature range, integrated ERROR/SHUTDOWN, and ceramic-capacitor stability - making it optimal for ruggedized embedded systems where reliability and system-level control are non-negotiable.
Availability
LP2951-33DRG4 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, smart grid sensor nodes, and motor drive control boards requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LP2951-33DRG4 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 headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management technologies for industrial, automotive, and communications markets.
The LP295x family was designed specifically for wide-input, low-quiescent-current LDO applications in harsh environments-emphasizing robustness, simplicity, and integration of supervision features like ERROR and SHUTDOWN without external components.
FAQ
What is the output voltage tolerance of the LP2951-33DRG4 over temperature and load?
The LP2951-33DRG4 provides ±1% output voltage accuracy over the full operating temperature range (–40°C to 125°C) and load current (100µA to 100mA), verified per TI's Electrical Characteristics table for the "new chip" revision. This specification applies specifically to the LP2951-33DRG4 in its fixed 3.3V configuration with FEEDBACK tied to VTAP and OUTPUT tied to SENSE.
Does the LP2951-33DRG4 require an external resistor divider to set the output voltage?
No, the LP2951-33DRG4 is a fixed-output variant and does not require an external resistor divider. Its 3.3V output is achieved by internally connecting FEEDBACK to VTAP and OUTPUT to SENSE - all necessary connections are implemented within the die. External resistors are only needed for adjustable versions like LP2951-33ADJ.
What is the minimum input voltage required for regulation at full 100mA load?
At 100mA load, the LP2951-33DRG4 requires a minimum input voltage of 3.64V (3.3V + 340mV typical dropout). The datasheet confirms 340mV typical dropout at 100mA and 25°C; worst-case dropout is 570mV over temperature, so 3.87V ensures regulation across –40°C to 125°C.
Can the LP2951-33DRG4 operate with a 1μF ceramic output capacitor?
Yes, the LP2951-33DRG4 is explicitly characterized for stability with ceramic output capacitors ranging from 1μF to 100μF and ESR from 0Ω to 2Ω. Unlike legacy LDOs, it does not require minimum ESR, eliminating the need for series resistors or tantalum capacitors - a key design advantage confirmed in Section 5.3 of the datasheet.
How does the ERROR pin function in the LP2951-33DRG4?
The ERROR pin on the LP2951-33DRG4 is an active-low open-drain output that pulls low when the regulated output drops more than 6% below nominal (i.e., <3.102V for 3.3V). It is referenced to the internal 1.20V bandgap and remains asserted until VOUT recovers; an external pull-up resistor is required for proper logic-level interfacing in the host system.
LP2951-33DRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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):
- 30V
- 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-SOIC
LP2951-33DRG4 FAQ
1.How can I place an order for LP2951-33DRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP2951-33DRG4 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 LP2951-33DRG4 reliable?
The price and inventory of LP2951-33DRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP2951-33DRG4 is usually 5 days.
3.What payment methods are accepted for LP2951-33DRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP2951-33DRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP2951-33DRG4?
LP2951-33DRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP2951-33DRG4 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 LP2951-33DRG4?
For technical support, including LP2951-33DRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP2951-33DRG4 requirements.
6.How does Aetrix verify that LP2951-33DRG4 is sourced from the original manufacturer or authorized distributors?
All LP2951-33DRG4 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 LP2951-33DRG4 meets industry standards.
7.What is the process for return or replacement of LP2951-33DRG4?
All LP2951-33DRG4 units undergo pre-shipment inspection (PSI). If there is an issue with LP2951-33DRG4, 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 LP2951-33DRG4 part is unused and in its original packaging.
Return procedure for LP2951-33DRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LP2951-33DRG4 Tags
-
MIC5504-1.8YM5-TR
Microchip Technology
-
MIC5504-3.3YM5-TR
Microchip Technology
-
MIC5365-3.0YC5-TR
Microchip Technology
-
MIC5365-1.8YC5-TR
Microchip Technology
-
MIC5365-2.5YC5-TR
Microchip Technology
-
MIC5365-3.3YC5-TR
Microchip Technology
-
MIC5365-3.3YD5-TR
Microchip Technology
-
MIC5317-3.3YM5-TR
Microchip Technology
-
TLV1117LV33DCYR
Texas Instruments
-
MIC5317-3.3YMT-TZ
Microchip Technology
-
MIC5528-3.3YMT-TR
Microchip Technology
-
TLV75801PDRVR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
