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Texas Instruments LP3470IM5-4.8/NOPB
- Part No.:
- LP3470IM5-4.8/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LP3470IM5-4.8/NOPB.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,861
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Product details
Overview
LP3470IM5-4.8/NOPB from Texas Instruments is a micropower voltage supervisor IC with 4.8 V ±1% reset threshold, open-drain active-low reset output, and programmable reset time-out period (2 ms to 3.5 s) set by an external capacitor on the SRT pin. It monitors VCC supply voltage down to 0.5 V and operates across –20°C to 85°C, serving critical power-on-reset (POR) functions in microprocessor systems.
For engineers reviewing the LP3470IM5-4.8/NOPB datasheet, LP3470IM5-4.8/NOPB pinout, LP3470IM5-4.8/NOPB application, or LP3470IM5-4.8/NOPB equivalent, key selection criteria include reset threshold accuracy, low quiescent current (16 µA typical), immunity to short VCC transients, and compatibility with standard 5-pin SOT-23 layouts for space-constrained embedded designs.
Technical Context
The LP3470IM5-4.8/NOPB implements a precision bandgap-based voltage reference with hysteresis (15–65 mV) to prevent chatter during brownout recovery. Its internal comparator continuously monitors VCC against the factory-programmed 4.8 V threshold, asserting Reset low when VCC falls below VRTH − VHYST.
Reset assertion duration is fully determined by an external capacitor (C1) connected between SRT and GND, using the linear relationship tRP = 2000 × C1 (C1 in µF, tRP in ms). The open-drain Reset output requires an external pullup resistor (0.68–68 kΩ) and remains valid down to VCC = 0.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.8 V ±1% over temperature - ensures precise power-up sequencing for 5 V logic rails without margining errors. |
| Quiescent Current | 16 µA typical at 4.5 V - enables multi-year battery life in portable equipment with continuous supervision. |
| Operating Voltage Range | 0.5 V to 5.5 V - guarantees reliable reset assertion even during deep brownout or ultra-low-power wake-up conditions. |
| Reset Time-Out Period | Programmable from 1 ms to 3.5 ms (at 25°C) via external capacitor - supports flexible POR timing without firmware dependency. |
| Hysteresis Voltage | 15–65 mV - prevents oscillatory reset toggling during slow-rising or noisy supply transitions. |
| VCC to Reset Delay | 100–300 µs - provides fast fault response for transient-induced undervoltage events. |
| Output Type | Open-drain, active-low - allows wired-OR reset bus configuration and interface with diverse logic families (3.3 V/5 V). |
Pinout & Package
LP3470IM5-4.8/NOPB is housed in a 5-pin SOT-23 (DBV) package measuring 1.60 mm × 2.90 mm, optimized for high-density PCB layouts and reflow-compatible assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SRT) | Reset time-out programming input | Connects to external capacitor (C1) to set tRP; floating disables delay; ceramic ≥10 V rating recommended. |
| 2 (GND) | Ground reference | Primary return path for internal circuitry and reset output; must be low-impedance connection to system ground plane. |
| 3 (VCC1) | Internal supply tie | Must be shorted directly to VCC (Pin 4); no external connection or decoupling required. |
| 4 (VCC) | Supply voltage and monitor input | Monitored rail input; also powers internal circuitry; valid operation starts at 0.5 V. |
| 5 (Reset) | Open-drain reset output | Active-low signal; requires external pullup (e.g., 20 kΩ to VCC); sinks ≤10 mA; logic low guaranteed down to VCC = 0.5 V. |
Key Features
| Feature | Design Value |
|---|---|
| ±1% reset threshold accuracy | Eliminates need for external trimming or calibration in production, reducing BOM count and test time for 4.8 V rail monitoring. |
| Programmable reset timeout | Enables one IC to support multiple POR timing requirements across product variants using only capacitor value changes. |
| Immunity to short VCC transients | Rejects sub-microsecond negative glitches up to 100 mV amplitude, preventing spurious resets in electrically noisy environments. |
| Low 16 µA quiescent current | Minimizes standby power draw in always-on supervisory circuits, critical for coin-cell or energy-harvesting applications. |
| Valid reset down to 0.5 V VCC | Ensures deterministic system behavior during deep discharge or cold-start conditions where supply may sag below 1 V. |
Applications
| Industrial PLC I/O Module | Medical Patient Monitor |
|---|---|
Use Scenario: Monitors 5 V auxiliary supply powering isolated analog front-end and communication interfaces. IC Role / Device Role / Timing Role: Voltage supervisor providing power-on reset and brownout detection before FPGA configuration and ADC initialization. Use Value: Prevents metastability in digital logic and invalid sensor readings during unstable power ramp-up, meeting IEC 61000-4-2 immunity requirements. |
Use Scenario: Supervises main 5 V rail feeding microcontroller, display driver, and wireless telemetry subsystem. IC Role / Device Role / Timing Role: Ensures clean boot sequence and safe shutdown during battery swap or AC adapter disconnect. Use Value: Guarantees clinical data integrity by holding reset until stable 4.8 V threshold is met and maintained for ≥2 ms, satisfying FDA Class II software validation expectations. |
| Automotive Body Control Module | Smart Home Gateway |
Use Scenario: Watches 5 V domain supply derived from vehicle battery via LDO, subject to load-dump and cold-crank transients. IC Role / Device Role / Timing Role: Provides robust POR and undervoltage lockout (UVLO) with hysteresis to avoid cycling during engine cranking. Use Value: Maintains ECU state integrity by asserting reset for ≥200 ms after VCC recovers above 4.8 V, complying with ISO 16750-2 pulse 4a requirements. |
Use Scenario: Supervises 5 V USB-powered SoC supply in always-connected Wi-Fi/Zigbee hub with battery backup. IC Role / Device Role / Timing Role: Generates controlled reset pulse to synchronize Linux kernel boot and peripheral enumeration after power restoration. Use Value: Enables <200 ms boot-to-ready latency by matching tRP to SoC's minimum reset hold time, eliminating software polling delays. |
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; 35 µA IQ; requires external R/C for delay; tighter 0.5% threshold accuracy. | Not suitable for 4.8 V rail monitoring without level-shifting; better for low-noise 3.3 V systems. | Select only if 3.3 V supervision is required and higher accuracy justifies 2.2× higher quiescent current. |
| MAX6326UR48+T | 4.8 V threshold; 1.6 µA IQ; fixed 140 ms timeout; no external capacitor option. | Lacks programmable delay; insufficient for applications requiring >100 ms reset hold time. | Choose when ultra-low power dominates design priorities and fixed timing meets system requirements. |
Compared with LP3470IM5-4.8/NOPB, TPS3808G33DBVR offers superior accuracy but mismatches the 4.8 V rail and consumes more current, while MAX6326UR48+T saves power but sacrifices timing flexibility-making LP3470IM5-4.8/NOPB optimal for cost-sensitive, programmable-POR 5 V systems.
Availability
LP3470IM5-4.8/NOPB is available at Aetrix Electronics and suitable for industrial PLC I/O modules, medical patient monitors, automotive body control units, smart home gateways, and portable instrumentation requiring stable component supply and long-term manufacturability.
Supply support for LP3470IM5-4.8/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 is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in power management and system-level reliability.
The LP3470IM5-4.8/NOPB belongs to TI's voltage supervisor product line, engineered for high-accuracy, low-power power-on-reset and brownout protection in microprocessor-based systems operating under variable thermal and supply conditions.
FAQ
What is the exact reset threshold voltage of LP3470IM5-4.8/NOPB?
The LP3470IM5-4.8/NOPB has a factory-programmed reset threshold of 4.8 V with ±1% accuracy over the full operating temperature range (–20°C to 85°C). This means the actual threshold falls between 4.752 V and 4.848 V at 25°C, and between 4.728 V and 4.872 V across temperature extremes, ensuring consistent behavior in 5 V rail supervision.
How do I calculate the reset time-out period for LP3470IM5-4.8/NOPB?
The reset time-out period (tRP) for LP3470IM5-4.8/NOPB is calculated using tRP (ms) = 2000 × C1 (µF), where C1 is the capacitance connected between the SRT pin and GND. For example, a 100 nF capacitor yields tRP = 200 ms. At 25°C, tRP ranges from 1 ms to 3.5 ms depending on C1 value; temperature variation adds ±0.5 ms tolerance.
Does LP3470IM5-4.8/NOPB require an external pullup resistor on the Reset pin?
Yes, LP3470IM5-4.8/NOPB features an open-drain Reset output and requires an external pullup resistor (0.68–68 kΩ) to VCC. A typical value of 20 kΩ ensures sufficient rise time while limiting sink current to <10 mA. Without this resistor, the Reset signal cannot reach a valid logic-high state, causing system boot failure.
Can LP3470IM5-4.8/NOPB operate with supply voltages below 1 V?
Yes, LP3470IM5-4.8/NOPB guarantees valid reset assertion down to VCC = 0.5 V. Its internal circuitry remains functional and the Reset output stays low for VCC > 0.5 V, enabling reliable supervision during ultra-low-voltage conditions such as battery depletion or cold-cranking in automotive applications.
Is LP3470IM5-4.8/NOPB pin-compatible with other LP3470 variants?
Yes, all LP3470 variants-including LP3470IM5-4.8/NOPB-share identical 5-pin SOT-23 (DBV) packaging and pinout. The only differences are factory-set reset thresholds (e.g., 2.63 V, 3.08 V, 4.8 V); no PCB layout changes are needed when substituting between variants, provided the target supply rail matches the selected threshold.
LP3470IM5-4.8/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.8V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 1ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LP3470IM5-4.8/NOPB FAQ
1.How can I place an order for LP3470IM5-4.8/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3470IM5-4.8/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 LP3470IM5-4.8/NOPB reliable?
The price and inventory of LP3470IM5-4.8/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP3470IM5-4.8/NOPB is usually 5 days.
3.What payment methods are accepted for LP3470IM5-4.8/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3470IM5-4.8/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3470IM5-4.8/NOPB?
LP3470IM5-4.8/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3470IM5-4.8/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 LP3470IM5-4.8/NOPB?
For technical support, including LP3470IM5-4.8/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3470IM5-4.8/NOPB requirements.
6.How does Aetrix verify that LP3470IM5-4.8/NOPB is sourced from the original manufacturer or authorized distributors?
All LP3470IM5-4.8/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 LP3470IM5-4.8/NOPB meets industry standards.
7.What is the process for return or replacement of LP3470IM5-4.8/NOPB?
All LP3470IM5-4.8/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP3470IM5-4.8/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 LP3470IM5-4.8/NOPB part is unused and in its original packaging.
Return procedure for LP3470IM5-4.8/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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