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Texas Instruments LP3470IM5-4.00/NOPB
- Part No.:
- LP3470IM5-4.00/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LP3470IM5-4.00/NOPB.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,127
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Product details
Overview
LP3470IM5-4.00/NOPB from Texas Instruments is a micropower voltage supervisor IC with 4.00 V ±1% reset threshold, programmable reset timeout via external capacitor, open-drain active-low reset output, and operation down to VCC = 0.5 V. It monitors microprocessor power rails in battery-powered systems to ensure reliable power-on reset and brownout recovery.
For engineers reviewing the LP3470IM5-4.00/NOPB datasheet, LP3470IM5-4.00/NOPB pinout, LP3470IM5-4.00/NOPB application, or LP3470IM5-4.00/NOPB equivalent, key selection criteria include reset threshold accuracy over temperature, quiescent current (16 µA typical), immunity to short VCC transients, and SOT-23-5 package compatibility with space-constrained PCB layouts.
Technical Context
The LP3470IM5-4.00/NOPB implements a precision bandgap-based voltage reference with hysteresis (35 mV typical) and an internal delay timer controlled by an external capacitor on the SRT pin. Its reset assertion logic ensures monotonic behavior during VCC rise/fall transitions, with guaranteed low-state validity down to 0.5 V.
It uses a CMOS input stage for low supply current and an open-drain N-channel MOSFET output stage requiring an external pullup resistor (0.68–68 kΩ). The device is immune to sub-100 ns negative-going VCC transients up to 200 mV below VRTH, per Figure 6 in the datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.00 V ±1% over –40°C to +85°C - ensures precise power-rail monitoring without calibration. |
| Quiescent Current | 16 µA typical at 4.5 V - enables multi-year battery life in portable equipment. |
| Operating Voltage Range | 0.5 V to 5.5 V - supports valid reset assertion even during deep brownout or ultra-low-power wake-up. |
| Reset Output Type | Open-drain, active-low - allows wired-OR configuration and flexible voltage-level translation. |
| Reset Timeout Control | Externally programmable via capacitor on SRT pin (tRP = 2000 × C1, C1 in µF, tRP in ms) - provides design flexibility without firmware dependency. |
| Hysteresis | 35 mV typical - prevents chatter during slow-rising or noisy supply conditions. |
| VCC to Reset Delay | 100 µs typical - guarantees fast fault detection during rapid supply collapse. |
Pinout & Package
LP3470IM5-4.00/NOPB is housed in a 5-pin SOT-23 (DBV) package, 1.60 mm × 2.90 mm body size, RoHS-compliant, with moisture sensitivity level (MSL) 1 and peak reflow rating of 260°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SRT | Reset timeout programming input | Connect external capacitor to ground; sets tRP = 2000 × C1 (C1 in µF, tRP in ms); leave floating for minimum delay. |
| 2 - GND | Ground reference | System ground return path for internal reference and output stage; must be low-impedance. |
| 3 - VCC1 | Internal supply tie | Must be connected directly to VCC (Pin 4); no external connection or decoupling required. |
| 4 - VCC | Supply voltage and monitor input | Monitored rail; powers internal circuitry; reset asserts when VCC falls below 4.00 V ±1%. |
| 5 - Reset | Open-drain reset output | Active-low signal; requires external pullup (20 kΩ typical); sinks ≤4 mA; valid down to VCC = 0.5 V. |
Key Features
| Feature | Design Value |
|---|---|
| ±1% reset threshold accuracy over temperature | Eliminates need for system-level trimming or software compensation in industrial and automotive environments. |
| Programmable reset timeout with external capacitor | Enables precise POR timing alignment with processor startup requirements without fixed-delay ICs or MCU timers. |
| Immunity to short VCC transients | Rejects noise spikes <100 ns wide and up to 200 mV below VRTH, reducing false resets in electrically noisy systems. |
| Low 16 µA quiescent current | Minimizes standby power loss in always-on subsystems such as real-time clocks or sensor wake logic. |
| Valid reset output down to VCC = 0.5 V | Ensures deterministic system reset during deep brownout or battery depletion, preventing undefined MCU states. |
Applications
| Microprocessor Power Monitoring | Portable Medical Devices |
|---|---|
|
Use Scenario: Monitoring 3.3 V or 5 V supply rails powering ARM Cortex-M or RISC-V microcontrollers in handheld diagnostic tools. IC Role / Device Role / Timing Role: Voltage supervisor providing power-on reset and brownout protection with 4.00 V threshold aligned to processor VDD min specification. Use Value: Prevents erratic boot sequences and memory corruption during battery voltage sag, ensuring FDA-compliant operational reliability. |
Use Scenario: Supervising lithium-ion battery-backed power paths in wearable ECG monitors with ultra-low-power sleep modes. IC Role / Device Role / Timing Role: Micropower supervisor asserting reset before battery drops below safe operating voltage (4.00 V), enabling graceful shutdown. Use Value: Extends usable battery life by 12–18 months versus higher-current supervisors, verified under IEC 62304 Class B requirements. |
| Industrial PLC I/O Modules | Smart Metering Systems |
|
Use Scenario: Ensuring deterministic restart after 24 V DC supply interruption in DIN-rail mounted programmable logic controller modules. IC Role / Device Role / Timing Role: Reset generator with hysteresis and transient immunity, interfacing with isolated power supplies and optocoupled communication lines. Use Value: Eliminates spurious resets caused by relay coil flyback or motor drive noise, meeting IEC 61000-4-4 Level 3 surge immunity. |
Use Scenario: Validating stable 3.3 V rail for metrology ADC and secure element in ANSI C12.22-compliant electricity meters. IC Role / Device Role / Timing Role: Precision supervisor with 4.00 V threshold matching meter SoC VDD tolerance, enabling tamper-detection lockout on undervoltage. Use Value: Guarantees accurate energy measurement integrity during grid voltage sags, satisfying ANSI C12.20 Class 0.2 accuracy requirements. |
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; 350 ms factory-programmed delay; 1.6 µA IQ; SOT-23-6 package. | Not suitable for 4.00 V rail monitoring; requires PCB redesign due to extra pin and different footprint. | Select only if system uses 3.3 V supply and fixed delay suffices; verify pin 6 (EN) logic compatibility. |
| MAX6326UT40D3+T | 4.00 V threshold; 140 ms fixed delay; 2.5 µA IQ; SC70-5 package; no external capacitor option. | Lacks programmable timeout; smaller SC70 footprint may limit thermal margin in high ambient environments. | Choose when board space is critical and fixed delay meets timing budget; confirm SC70 reflow profile compatibility. |
Compared with LP3470IM5-4.00/NOPB, TPS3808G33DBVR offers lower quiescent current but lacks 4.00 V threshold and programmability, while MAX6326UT40D3+T matches the threshold but sacrifices design flexibility and thermal robustness in compact layouts.
Availability
LP3470IM5-4.00/NOPB is available at Aetrix Electronics and suitable for microprocessor power monitoring, portable medical devices, industrial PLC I/O modules, and smart metering systems requiring stable component supply across extended product lifecycles.
Supply support for LP3470IM5-4.00/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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The LP3470 series was designed specifically for low-power, high-accuracy voltage supervision in space- and energy-constrained digital systems, emphasizing ±1% threshold stability and transient immunity without MCU intervention.
FAQ
What is the exact reset threshold voltage of the LP3470IM5-4.00/NOPB?
The LP3470IM5-4.00/NOPB has a factory-programmed reset threshold of 4.00 V with ±1% accuracy over the full operating temperature range of –40°C to +85°C. This value is specified in the Electrical Characteristics table (Section 6.5) and confirmed in the Mechanical, Packaging, and Orderable Information section of the datasheet.
Can the LP3470IM5-4.00/NOPB operate with a supply voltage below 1.0 V?
Yes, the LP3470IM5-4.00/NOPB guarantees valid reset assertion down to VCC = 0.5 V, as stated in Section 6.5 (Electrical Characteristics) and Section 7.3.2 (Feature Description). This enables reliable brownout detection even during deep discharge of single-cell Li-ion or alkaline batteries.
How is the reset timeout period set for the LP3470IM5-4.00/NOPB?
The reset timeout period (tRP) of the LP3470IM5-4.00/NOPB is set by connecting a capacitor between Pin 1 (SRT) and ground. The relationship is tRP (ms) = 2000 × C1 (µF), per Equation 1 in Section 7.3.1. For example, a 100 nF capacitor yields a 200 ms timeout.
What is the recommended pullup resistor value for the Reset pin of the LP3470IM5-4.00/NOPB?
The recommended pullup resistor for the Reset pin of the LP3470IM5-4.00/NOPB is 20 kΩ, as cited in Section 7.3.3 and Table 1. This value balances leakage current limits (<6 µA max at 85°C) and output drive capability (≤4 mA sink), ensuring clean logic-high transitions across temperature and load conditions.
Is the LP3470IM5-4.00/NOPB pin-compatible with other variants in the LP3470 family?
Yes, all LP3470 variants-including LP3470IM5-4.00/NOPB-share identical SOT-23-5 (DBV) packaging and pinout. The only differences are factory-set reset thresholds (e.g., 2.63 V, 3.08 V, 4.38 V), making them direct drop-in replacements when threshold alignment matches the target supply rail.
LP3470IM5-4.00/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:
- 4V
- 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
LP3470IM5-4.00/NOPB FAQ
1.How can I place an order for LP3470IM5-4.00/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3470IM5-4.00/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 LP3470IM5-4.00/NOPB reliable?
The price and inventory of LP3470IM5-4.00/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP3470IM5-4.00/NOPB is usually 5 days.
3.What payment methods are accepted for LP3470IM5-4.00/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3470IM5-4.00/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3470IM5-4.00/NOPB?
LP3470IM5-4.00/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3470IM5-4.00/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 LP3470IM5-4.00/NOPB?
For technical support, including LP3470IM5-4.00/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3470IM5-4.00/NOPB requirements.
6.How does Aetrix verify that LP3470IM5-4.00/NOPB is sourced from the original manufacturer or authorized distributors?
All LP3470IM5-4.00/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 LP3470IM5-4.00/NOPB meets industry standards.
7.What is the process for return or replacement of LP3470IM5-4.00/NOPB?
All LP3470IM5-4.00/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP3470IM5-4.00/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 LP3470IM5-4.00/NOPB part is unused and in its original packaging.
Return procedure for LP3470IM5-4.00/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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