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Texas Instruments LP3470A293DBVR
- Part No.:
- LP3470A293DBVR
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LP3470A293DBVR.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,196
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Product details
Overview
LP3470A293DBVR from Texas Instruments is an ultra-low-power voltage supervisor IC designed for precise power-on reset and brownout detection in microcontroller systems. It features a factory-programmed 2.93 V reset threshold (±1% accuracy), programmable reset delay via external capacitor (50 µs to 6.2 s), open-drain active-low RESET output, and operates down to VCC = 0.95 V - ideal for battery-powered embedded control.
For engineers reviewing the LP3470A293DBVR datasheet, LP3470A293DBVR pinout, LP3470A293DBVR application, or LP3470A293DBVR equivalent, key selection considerations include reset threshold tolerance, quiescent current (0.3 µA typical), SRT capacitor-based timing flexibility, and immunity to short VCC transients in safety-critical power monitoring.
Technical Context
The LP3470A293DBVR implements a precision bandgap reference and comparator with hysteresis (75–125 mV for 2.93 V variant) to detect VCC falling below 2.93 V (VIT−) and rising above 3.03 V (VIT+). Its internal SRT pin resistance (350–650 kΩ) forms an RC time constant with an external capacitor to generate the reset timeout period.
It uses an open-drain N-channel MOSFET output stage requiring an external pull-up resistor, ensuring compatibility with mixed-voltage systems (RESET pulled up to ≤10 V independent of VCC). The device remains functional across −40°C to +125°C and draws only 0.3 µA typical supply current over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold (VIT−) | 2.93 V ±1% (typical); ensures reliable microcontroller reset at defined supply rail margin |
| Quiescent Current (ICC) | 0.3 µA typical at 25°C; enables multi-year operation on coin-cell batteries |
| Operating Voltage Range | 0.95 V to 10 V; supports low-VCC brownout detection and wide-input industrial supplies |
| RESET Output Type | Open-drain, active-low; allows wired-OR configuration and level-shifting with external pull-up |
| Reset Timeout Range | 50 µs (SRT floating) to 6.2 s (10 µF capacitor); configurable timing without firmware overhead |
| Hysteresis (VHYS) | 100 mV typical (for 2.93 V variant); prevents oscillation during slow-rising/falling VCC transitions |
| Propagation Delay (tP_HL) | 15–30 µs; fast response to supply faults while rejecting sub-µs noise spikes |
Pinout & Package
LP3470A293DBVR is housed in a 5-pin SOT-23 (DBV) package measuring 1.60 mm × 2.90 mm, optimized for space-constrained PCB layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SRT | Reset timeout programming input | Connect external capacitor to GND to set delay; floating = 50 µs minimum; 1 µF = ~619 ms |
| 2 - GND | Analog ground reference | Must be connected to system ground plane; serves as return for internal reference and SRT capacitor |
| 3 - VCC1 | Optional auxiliary supply pin | Can be left floating or tied to VCC; must never connect to GND - no current sink capability |
| 4 - VCC | Main supply and monitored voltage input | Monitors its own supply rail; RESET asserts when VCC drops below 2.93 V; valid down to 0.95 V |
| 5 - RESET | Open-drain active-low reset output | Drives low during fault; requires external pull-up (e.g., 20–100 kΩ to VCC or higher rail) |
Key Features
| Feature | Design Value |
|---|---|
| ±1% reset threshold accuracy | Guaranteed over −40°C to +125°C; eliminates need for external calibration in automotive/industrial designs |
| 0.3 µA typical quiescent current | Reduces standby power by >90% vs. legacy supervisors; extends battery life in portable instrumentation |
| Programmable reset delay (50 µs – 6.2 s) | Enables single-BOM flexibility across multiple timing requirements without firmware changes or part variants |
| Immunity to short VCC transients | Rejects <10 µs glitches with ≥5% overdrive; avoids false resets in noisy motor-drive or switching-regulator environments |
| Valid RESET assertion down to 0.95 V | Ensures clean processor reset even during deep brownout or Li-ion battery sag below 3.0 V |
Applications
| Microcontroller Power-On Reset | Battery-Powered Sensor Node |
|---|---|
Use Scenario: Ensuring deterministic boot sequence after cold start or wake-from-sleep in an ARM Cortex-M0+ system. IC Role / Device Role / Timing Role: Voltage supervisor asserting active-low RESET until VCC stabilizes above 2.93 V + hysteresis, then holding reset for user-defined delay (e.g., 100 ms via 0.16 µF SRT cap). Use Value: Prevents CPU lockup or flash corruption by guaranteeing stable supply before instruction fetch begins. |
Use Scenario: Long-life environmental monitor powered by CR2032 coin cell, transmitting data every 5 minutes. IC Role / Device Role / Timing Role: Supervises LDO output feeding MCU and sensor; triggers hard reset if battery voltage drops below 2.93 V during RF transmission burst. Use Value: Enables >5-year field operation by minimizing quiescent drain (0.3 µA) while maintaining fail-safe reset integrity. |
| Industrial PLC I/O Module | Video Surveillance DVR Power Sequencing |
Use Scenario: Protecting digital I/O logic from erratic behavior during 24 VDC supply fluctuations in factory automation cabinets. IC Role / Device Role / Timing Role: Monitors 3.3 V logic rail derived from isolated DC/DC converter; asserts RESET on brownout and holds for 500 ms post-recovery to allow FPGA reconfiguration. Use Value: Eliminates spurious I/O toggling or watchdog timeouts caused by transient dips in shared power distribution. |
Use Scenario: Coordinating safe power-up of SoC, DDR memory, and video encoder ASIC in a 12 V-powered DVR. IC Role / Device Role / Timing Role: Generates sequenced reset signals using cascaded LP3470A293DBVR units with staggered SRT capacitors (e.g., 100 nF → 470 nF → 1 µF). Use Value: Replaces complex discrete RC networks with compact, temperature-stable, production-tested timing blocks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G33DBVR | Fixed 3.3 V threshold; 1.6 µA ICC; internal 200 ms delay (non-programmable) | Suitable where fixed timing suffices and higher ICC is acceptable | Choose for simplified BOM when 3.3 V rail supervision and standard delay meet requirements |
| MAX6326UT29D3+ | 2.93 V threshold; 1.2 µA ICC; fixed 140 ms delay; SC70-5 package | Larger quiescent current; no SRT programmability; smaller footprint but lower thermal mass | Select when board space is critical and fixed delay is acceptable, accepting 4× higher IQ |
Compared with TPS3808G33DBVR and MAX6326UT29D3+, the LP3470A293DBVR offers the lowest quiescent current (0.3 µA), full SRT-based timing flexibility, and identical 2.93 V threshold accuracy - making it optimal for ultra-low-power, timing-variable, and cost-sensitive embedded designs.
Availability
LP3470A293DBVR is available at Aetrix Electronics and suitable for battery-powered sensors, industrial PLC modules, and microcontroller-based edge devices requiring stable component supply with guaranteed long-term manufacturability.
Supply support for LP3470A293DBVR 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 delivering analog and embedded processing solutions, with decades of expertise in precision power management and reliability-critical IC design.
The LP3470A293DBVR belongs to TI's ultra-low-power voltage supervisor family, engineered specifically for deterministic power sequencing and fail-safe reset generation in resource-constrained, battery-operated, and harsh-environment electronics.
FAQ
What is the exact reset threshold voltage of LP3470A293DBVR?
The LP3470A293DBVR has a factory-programmed nominal reset threshold (VIT−) of 2.93 V, with ±1% accuracy over −40°C to +125°C. This value is laser-trimmed during production and specified in the Electrical Characteristics table under "Negative-going input threshold accuracy." The corresponding VIT+ (rising threshold) is 3.03 V due to 100 mV hysteresis.
How do I calculate the reset timeout period for LP3470A293DBVR?
The reset timeout period (tD) for LP3470A293DBVR is calculated using tD = 619 × CSRT (in µF) + 50 µs, where CSRT is the capacitor value in microfarads connected between SRT (Pin 1) and GND. For example, a 0.1 µF capacitor yields ~66.9 ms delay. The formula accounts for internal SRT resistance (350–650 kΩ) and process variation.
Can LP3470A293DBVR monitor a 5 V supply while driving a 3.3 V microcontroller RESET line?
Yes. LP3470A293DBVR's open-drain RESET output (Pin 5) can be pulled up to any voltage ≤10 V, independent of VCC. To interface with a 3.3 V MCU, connect a pull-up resistor (e.g., 47 kΩ) from RESET to the 3.3 V rail - not to VCC - enabling level-shifted reset signaling without additional logic.
Does LP3470A293DBVR require a bypass capacitor on VCC?
Yes. Texas Instruments recommends placing a 0.1 µF ceramic capacitor as close as possible to the VCC pin (Pin 4) to suppress high-frequency noise and improve transient immunity. This minimizes false resets caused by switching regulator ripple or ESD-induced supply disturbances, especially in motor drive or industrial environments.
Is LP3470A293DBVR pin-compatible with other members of the LP3470A family?
Yes. All LP3470A variants - including LP3470A263DBVR, LP3470A275DBVR, and LP3470A293DBVR - share identical 5-pin SOT-23 (DBV) packaging and pinout. They differ only in factory-set reset thresholds; no PCB layout change is needed when substituting between variants for design optimization or supply chain flexibility.
LP3470A293DBVR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.93V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 619ms Typical
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LP3470A293DBVR FAQ
1.How can I place an order for LP3470A293DBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3470A293DBVR 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 LP3470A293DBVR reliable?
The price and inventory of LP3470A293DBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP3470A293DBVR is usually 5 days.
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LP3470A293DBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3470A293DBVR 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 LP3470A293DBVR?
For technical support, including LP3470A293DBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3470A293DBVR requirements.
6.How does Aetrix verify that LP3470A293DBVR is sourced from the original manufacturer or authorized distributors?
All LP3470A293DBVR 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 LP3470A293DBVR meets industry standards.
7.What is the process for return or replacement of LP3470A293DBVR?
All LP3470A293DBVR units undergo pre-shipment inspection (PSI). If there is an issue with LP3470A293DBVR, 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 LP3470A293DBVR part is unused and in its original packaging.
Return procedure for LP3470A293DBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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