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Texas Instruments LP3470A365DBVR
- Part No.:
- LP3470A365DBVR
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LP3470A365DBVR.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,380
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Product details
Overview
LP3470A365DBVR from Texas Instruments is a micropower voltage supervisor IC designed to monitor 3.65 V supply rails in microprocessor systems, asserting an open-drain active-low RESET signal when VCC falls below 3.65 V (±1% accuracy), with programmable reset delay up to 6.2 s via external capacitor, ultra-low 0.3 µA quiescent current, and guaranteed operation down to VCC = 0.95 V.
For engineers reviewing the LP3470A365DBVR datasheet, LP3470A365DBVR pinout, LP3470A365DBVR application, or LP3470A365DBVR equivalent, this page delivers verified electrical parameters, SOT-23-5 pin mapping, real-world timing behavior, thermal performance data, and validated alternative options for brownout protection in battery-powered and industrial embedded designs.
Technical Context
The LP3470A365DBVR implements a precision bandgap-based threshold detection circuit with ±1% VIT− accuracy over −40°C to 125°C, hysteresis of 200 mV (typical), and glitch immunity against transients ≥10 µs at 5% overdrive. Its internal RSRT resistor (500 kΩ typical) forms a time constant with the external SRT capacitor to generate programmable reset delays from 50 µs (SRT floating) to 619 ms (1 µF) or 6.2 s (10 µF).
It features an open-drain N-channel MOSFET RESET output requiring external pull-up, operates across 0.95–10 V VCC, maintains valid RESET assertion down to 0.95 V, and exhibits <90 nA leakage in high-impedance state - enabling reliable power-on reset and brownout recovery in low-power microcontroller applications without loading the monitored rail.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold (VIT−) | 3.65 V ±1% (typical); ensures precise brownout detection at nominal 3.65 V supply without calibration. |
| Quiescent Current (ICC) | 0.3 µA (typical at 25°C); enables multi-year battery life in always-on monitoring circuits. |
| RESET Valid Down To | VCC = 0.95 V; guarantees reset assertion even during deep undervoltage conditions before system collapse. |
| Hysteresis (VHYS) | 200 mV (typical); prevents oscillation during slow-rising/falling VCC transitions near threshold. |
| Reset Delay Range | 50 µs (SRT floating) to 6.2 s (10 µF on SRT); supports flexible timing for diverse processor boot sequences. |
| Output Type | Open-drain RESET; allows level-shifting, wired-OR configuration, and compatibility with 1.8–10 V logic domains. |
| Operating Temp | −40°C to +125°C; qualified for automotive under-hood, industrial control, and outdoor equipment environments. |
Pinout & Package
LP3470A365DBVR is housed in a 5-pin SOT-23 (DBV) package measuring 1.60 mm × 2.90 mm, optimized for space-constrained PCB layouts and reflow-compatible assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SRT | Reset time-out programming input | Connect external capacitor (≤10 µF) to GND to set delay; floating = 50 µs minimum; internal 500 kΩ resistor sets RC time constant. |
| 2 - GND | Ground reference | System ground return path; must be low-impedance and adjacent to 0.1 µF bypass capacitor per layout guidelines. |
| 3 - VCC1 | Optional auxiliary supply pin | May be left floating or tied to VCC; never connect to GND - no internal connection to ground or power planes. |
| 4 - VCC | Main supply and threshold monitor input | Monitors target rail voltage; supplies internal circuitry; valid operation from 0.95 V to 10 V. |
| 5 - RESET | Open-drain active-low reset output | Sinks current when asserted; requires external pull-up resistor (20–100 kΩ typical) to desired logic voltage domain. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable reset delay | Configurable from 50 µs to 6.2 s using single external capacitor - eliminates need for fixed-timing supervisors or discrete RC networks. |
| ±1% reset threshold accuracy | Factory-trimmed over temperature; removes requirement for external calibration or margining in safety-critical power monitoring. |
| Ultra-low 0.3 µA quiescent current | Reduces standby power by >95% vs legacy supervisors; critical for coin-cell or energy-harvesting applications. |
| Immunity to short VCC transients | Rejects pulses <10 µs at 5% overdrive; prevents false resets from switching noise or ESD-induced supply glitches. |
| Valid RESET down to 0.95 V | Ensures deterministic reset assertion through full brownout event - unlike many supervisors that release reset prematurely. |
Applications
| Industrial Sensor Node | Smart Building Controller |
|---|---|
|
Use Scenario: Battery-powered wireless temperature/humidity sensor operating on CR2032 cell with LDO-regulated 3.3 V rail. IC Role / Device Role / Timing Role: Monitors 3.65 V LDO input to detect primary battery depletion before regulated output collapses; asserts RESET to halt MCU execution and enter deep sleep. Use Value: Prevents corrupted EEPROM writes or RF transmission during undervoltage, extending field lifetime by avoiding premature node failure. |
Use Scenario: HVAC controller board powered from 5 V SMPS with transient-prone AC line input. IC Role / Device Role / Timing Role: Supervises 3.65 V auxiliary rail feeding MCU and CAN transceiver; provides 100 ms reset hold time after brownout recovery to ensure stable clock lock and peripheral initialization. Use Value: Eliminates spurious CAN bus errors and firmware crashes caused by marginal power during grid sags or motor startup surges. |
| Portable Medical Monitor | Motor Drive Safety Module |
|
Use Scenario: Handheld ECG device with dual Li-ion cells and 3.65 V buck converter output powering analog front-end and ARM Cortex-M4. IC Role / Device Role / Timing Role: Acts as primary POR/BOR element; triggers hardware reset if cell voltage drops below safe operating window, blocking unsafe signal acquisition. Use Value: Meets IEC 62304 Class B software safety requirements by enforcing deterministic power-fail response independent of firmware state. |
Use Scenario: IGBT gate driver board in servo amplifier with isolated 3.65 V logic supply derived from main DC bus. IC Role / Device Role / Timing Role: Detects isolation barrier supply fault; holds RESET for 500 ms after recovery to prevent inadvertent IGBT turn-on during bootstrap capacitor recharge. Use Value: Avoids shoot-through failures and catastrophic inverter destruction by enforcing minimum safe dead-time after power interruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV803EB36DPWR | Fixed 3.6 V threshold (±2%), 0.5 µA IQ, no programmable delay - uses internal timer only. | Lacks SRT pin; reset timeout is factory-set (~200 ms), limiting flexibility for custom boot sequences. | Choose when board space is constrained and fixed delay suffices; avoid where adaptive timing or long delays (>1 s) are required. |
| MAX6373XS36D3+ | 3.63 V threshold (±0.5%), 1.2 µA IQ, 140 ms fixed delay, higher ESD rating (±4 kV HBM). | Higher quiescent current reduces battery life; fixed delay cannot be adjusted post-layout. | Select for enhanced ESD robustness in noisy factory environments; not suitable for ultra-low-power or timing-flexible designs. |
Compared with TLV803EB36DPWR and MAX6373XS36D3+, the LP3470A365DBVR uniquely combines ±1% accuracy, 0.3 µA IQ, and fully programmable delay - making it the only option among the three capable of supporting both multi-year battery life and application-specific reset timing without redesign.
Availability
LP3470A365DBVR is available at Aetrix Electronics and suitable for industrial sensor nodes, smart building controllers, portable medical monitors, and motor drive safety modules requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for LP3470A365DBVR 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, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets since 1930.
The LP3470A365DBVR belongs to TI's precision voltage supervisor product line, engineered specifically for ultra-low-power, high-accuracy power monitoring in battery-operated and safety-critical embedded systems where reliability and longevity are non-negotiable.
FAQ
What is the exact reset threshold voltage of the LP3470A365DBVR?
The LP3470A365DBVR has a factory-programmed negative-going input threshold (VIT−) of 3.65 V with ±1% accuracy over −40°C to +125°C. This value is confirmed in the Device Comparison Table and Electrical Characteristics section of the official TI datasheet SNVSBF5C. The corresponding positive-going threshold (VIT+) is 3.85 V, yielding 200 mV hysteresis. No external trimming or calibration is required.
Can the LP3470A365DBVR operate with a 1.8 V supply rail?
No - the LP3470A365DBVR is not rated for 1.8 V operation. Its minimum valid VCC is 0.95 V, but its reset threshold is fixed at 3.65 V. Applying 1.8 V to VCC will keep the device in permanent reset (RESET = low) because VCC remains below VIT−. It is intended to monitor 3.65 V rails, not to be powered from them; for 1.8 V supervision, consider LP3470A180DBVR or similar variants.
How do I calculate the reset delay time for a given capacitor on the SRT pin of the LP3470A365DBVR?
Use the formula tD = 619 × CSRT (in µF) to obtain delay in milliseconds - e.g., a 100 nF (0.1 µF) capacitor yields ~61.9 ms. This linear approximation is derived from the datasheet's simplified equation (tD = 618937 × CSRT + 50 µs) and validated across temperature. For precision timing, account for ±20% capacitor tolerance and RSRT variation (350–650 kΩ) per Electrical Characteristics table.
Is the LP3470A365DBVR pin-to-pin compatible with the original LP3470?
Yes - the LP3470A365DBVR is explicitly stated in the datasheet Features section as "pin-to-pin compatible with LP3470". Both share identical SOT-23-5 (DBV) footprint, pin numbering, and basic functionality. However, the LP3470A offers improved ±1% threshold accuracy (vs ±2% for LP3470) and lower 0.3 µA ICC (vs 0.35 µA), making it a direct drop-in upgrade.
What is the maximum recommended capacitor value for the SRT pin on the LP3470A365DBVR?
The datasheet specifies 10 µF as the maximum recommended capacitor value for the SRT pin. Larger capacitors risk incomplete discharge during brief brownout events, causing shorter-than-expected reset delays upon recovery. At 10 µF, the LP3470A365DBVR achieves ~6.2 s delay (per Figure 8), and layout guidelines require short, low-inductance traces between SRT and GND to preserve timing accuracy.
LP3470A365DBVR 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:
- 3.65V
- 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
LP3470A365DBVR FAQ
1.How can I place an order for LP3470A365DBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3470A365DBVR 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 LP3470A365DBVR reliable?
The price and inventory of LP3470A365DBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP3470A365DBVR is usually 5 days.
3.What payment methods are accepted for LP3470A365DBVR?
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LP3470A365DBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3470A365DBVR 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 LP3470A365DBVR?
For technical support, including LP3470A365DBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3470A365DBVR requirements.
6.How does Aetrix verify that LP3470A365DBVR is sourced from the original manufacturer or authorized distributors?
All LP3470A365DBVR 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 LP3470A365DBVR meets industry standards.
7.What is the process for return or replacement of LP3470A365DBVR?
All LP3470A365DBVR units undergo pre-shipment inspection (PSI). If there is an issue with LP3470A365DBVR, 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 LP3470A365DBVR part is unused and in its original packaging.
Return procedure for LP3470A365DBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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