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Texas Instruments LP3470IM5X-4.38
- Part No.:
- LP3470IM5X-4.38
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LP3470IM5X-4.38.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,216
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Product details
Overview
LP3470IM5X-4.38 from Texas Instruments is a micropower voltage supervisor IC with factory-programmed 4.38 V ±1% reset threshold, open-drain active-low reset output, and programmable reset time-out period (2 ms typical with 1 nF capacitor). It monitors VCC supply voltage in microprocessor systems and asserts reset below threshold, holding it for tRP after recovery. Used in battery-powered embedded controllers requiring reliable power-on-reset.
For engineers reviewing the LP3470IM5X-4.38 datasheet, LP3470IM5X-4.38 pinout, LP3470IM5X-4.38 application, or LP3470IM5X-4.38 equivalent, key selection criteria include reset threshold accuracy over temperature, immunity to VCC transients, low quiescent current (16 µA typ), operation down to 0.5 V, and SOT-23-5 package compatibility with space-constrained PCB layouts.
Technical Context
The LP3470IM5X-4.38 implements a precision bandgap-based voltage reference comparator with hysteresis (35 mV typ) and an internal delay timer controlled by external capacitor on SRT pin. Its reset assertion logic ensures monotonic behavior during brownout recovery, with guaranteed reset validity down to VCC = 0.5 V.
It features open-drain Reset output requiring external pullup (0.68–68 kΩ), operates across –40°C to +85°C, and maintains ±1% reset threshold accuracy over full temperature range. Immunity to short negative-going VCC transients is achieved via internal filtering and timing rejection circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.38 V ±1% over –40°C to +85°C - ensures precise system power-up sequencing at nominal 4.5 V rails. |
| Quiescent Current | 16 µA typical at 4.5 V - enables multi-year battery life in portable equipment. |
| Reset Output Type | Open-drain, active-low - supports wired-OR reset buses and flexible voltage-level interfacing. |
| Minimum Operating VCC | 0.5 V - guarantees valid reset assertion during deep brownout or ultra-low-power shutdown. |
| Reset Time-Out Period | Programmable via external capacitor (tRP = 2000 × C1, C1 in µF, tRP in ms) - allows customization from sub-ms to seconds without firmware changes. |
| Hysteresis Voltage | 35 mV typical - prevents chatter during slow-rising or noisy VCC transitions near threshold. |
| VCC Transient Immunity | Immune to short negative-going transients per Figure 6 - reduces false resets in electrically noisy environments. |
Pinout & Package
LP3470IM5X-4.38 is housed in a 5-pin SOT-23 (DBV) package measuring 1.60 mm × 2.90 mm, optimized for high-density PCB layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SRT | Reset time-out programming input | Connect external capacitor to ground to set tRP; floating disables delay. Timing accuracy depends on capacitor stability and layout proximity. |
| 2 - GND | Ground reference | Primary return path for internal reference and comparator; must be connected to clean system ground plane. |
| 3 - VCC1 | Internal supply tie | Must be shorted directly to VCC (Pin 4); not functional as independent input - internal connection only. |
| 4 - VCC | Supply voltage and monitor input | Monitored rail input; powers device and triggers reset when falling below 4.38 V; operates from 0.5 V to 5.5 V. |
| 5 - Reset | Open-drain reset output | Active-low signal asserted during undervoltage; requires external pullup resistor (typ. 20 kΩ) to host VCC or logic rail. |
Key Features
| Feature | Design Value |
|---|---|
| ±1% reset threshold accuracy over temperature | Eliminates need for calibration or margining in industrial-grade power monitoring designs. |
| Programmable reset time-out using external capacitor | Enables precise POR timing alignment with processor startup requirements without modifying firmware or BOM. |
| Reset valid down to VCC = 0.5 V | Ensures deterministic system state during deep discharge or backup battery switchover. |
| Low 16 µA quiescent current | Reduces standby power loss in always-on IoT nodes and portable medical devices. |
| Immunity to short VCC transients | Prevents spurious resets caused by switching noise, ESD coupling, or load dump events. |
Applications
| Microprocessor Power-On Reset | Battery-Powered Instrumentation |
|---|---|
|
Use Scenario: Ensuring clean boot of ARM Cortex-M microcontrollers during Li-ion battery discharge from 4.2 V to 3.0 V. IC Role / Device Role / Timing Role: Voltage supervisor asserting active-low reset until VCC exceeds 4.38 V and holds for 200 ms (C1 = 100 nF). Use Value: Prevents CPU lockup or flash corruption during marginal supply conditions; eliminates need for discrete RC reset networks. |
Use Scenario: Maintaining reliable operation of handheld multimeters powered by two AA cells (1.0–3.2 V range). IC Role / Device Role / Timing Role: Monitoring regulated 3.3 V rail derived from boost converter; asserting reset if input drops below 4.38 V threshold on upstream supply. Use Value: Guarantees measurement integrity by disabling analog front-end before ADC reference collapses. |
| Industrial PLC I/O Module | Smart Sensor Node |
|
Use Scenario: Supervising 5 V backplane supply in DIN-rail mounted programmable logic controller modules. IC Role / Device Role / Timing Role: Detecting brownout events on 5 V rail and holding MCU in reset for 100 ms (C1 = 50 nF) to prevent spurious I/O writes. Use Value: Meets IEC 61000-4-29 immunity requirements for sustained dips; avoids field failures due to transient-induced firmware crashes. |
Use Scenario: Enabling autonomous wake-up and sensor readout in LoRaWAN environmental sensors with coin-cell batteries. IC Role / Device Role / Timing Role: Providing power-good signal to enable RF transceiver only after stable 3.3 V LDO output reaches 4.38 V threshold. Use Value: Extends battery life by preventing radio transmission during unstable power ramp-up; reduces average system current by >2 µA. |
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; higher ICC (2.5 µA min) | Not suitable for 4.38 V rail monitoring; better for lower-voltage SoCs with fixed timing needs | Select only if system uses 3.3 V supply and requires guaranteed minimum delay without external capacitor. |
| MAX6326UT44D3+ | 4.40 V threshold (±2.5%); no programmable delay; push-pull output; higher ICC (10 µA typ) | Lacks tRP adjustability; incompatible with open-drain bus architectures requiring wired-OR | Choose when board space prohibits external capacitor and push-pull drive simplifies interface with FPGA reset inputs. |
Compared with LP3470IM5X-4.38, TPS3808G33DBVR offers tighter delay tolerance but cannot monitor 4.38 V rails, while MAX6326UT44D3+ provides push-pull output and smaller footprint but sacrifices programmability and threshold accuracy - making LP3470IM5X-4.38 optimal for precision 4.38 V supervision with flexible timing.
Availability
LP3470IM5X-4.38 is available at Aetrix Electronics and suitable for microprocessor power-on-reset, battery-powered instrumentation, and industrial PLC I/O modules requiring stable component supply with long-term lifecycle support.
Supply support for LP3470IM5X-4.38 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 delivering analog and embedded processing solutions, with leadership in power management, signal chain, and microcontroller technologies.
The LP3470 product line delivers precision, low-power voltage supervisors for reliable power sequencing in space- and energy-constrained embedded systems - designed specifically for microprocessor and microcontroller reset assurance.
FAQ
What is the exact reset threshold voltage of the LP3470IM5X-4.38?
The LP3470IM5X-4.38 has a factory-programmed reset threshold of 4.38 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 under VRTH for the LP3470I grade and confirmed in the Mechanical, Packaging, and Orderable Information section where "LP3470IM5X-4.38/NOPB" is explicitly listed with D30C marking.
Does the LP3470IM5X-4.38 require an external capacitor to function?
No - the LP3470IM5X-4.38 operates without an external capacitor. Pin SRT may be left floating to disable the programmable reset time-out period. However, adding a capacitor (e.g., 1 nF) between SRT and GND sets tRP = 2 ms, which is commonly used to ensure sufficient reset hold time for microprocessor initialization.
What is the recommended pullup resistor value for the Reset pin of the LP3470IM5X-4.38?
The Reset pin of the LP3470IM5X-4.38 is open-drain and requires an external pullup resistor between Reset and the target logic rail (typically VCC). TI specifies R1 between 0.68 kΩ and 68 kΩ; a typical value of 20 kΩ balances speed, power, and noise immunity. Values outside this range risk excessive current or weak logic-high levels.
Can the LP3470IM5X-4.38 operate with supply voltages below 1 V?
Yes - the LP3470IM5X-4.38 guarantees valid reset assertion down to VCC = 0.5 V, as stated in the Electrical Characteristics table under "Reset Valid Down to VCC = 0.5 V". This enables use in ultra-low-power brownout detection scenarios, such as backup battery switchover or energy-harvesting systems.
Is the LP3470IM5X-4.38 pin-compatible with other LP3470 variants?
Yes - all LP3470 variants, including LP3470IM5X-4.38, share identical SOT-23-5 (DBV) packaging and pinout (SRT, GND, VCC1, VCC, Reset). The only differences are factory-programmed reset threshold voltage and temperature grade; no PCB redesign is needed when substituting between LP3470IM5X-x.x variants.
LP3470IM5X-4.38 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.38V
- 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
LP3470IM5X-4.38 FAQ
1.How can I place an order for LP3470IM5X-4.38 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3470IM5X-4.38 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 LP3470IM5X-4.38 reliable?
The price and inventory of LP3470IM5X-4.38 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP3470IM5X-4.38 is usually 5 days.
3.What payment methods are accepted for LP3470IM5X-4.38?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3470IM5X-4.38 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3470IM5X-4.38?
LP3470IM5X-4.38 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3470IM5X-4.38 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 LP3470IM5X-4.38?
For technical support, including LP3470IM5X-4.38 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3470IM5X-4.38 requirements.
6.How does Aetrix verify that LP3470IM5X-4.38 is sourced from the original manufacturer or authorized distributors?
All LP3470IM5X-4.38 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 LP3470IM5X-4.38 meets industry standards.
7.What is the process for return or replacement of LP3470IM5X-4.38?
All LP3470IM5X-4.38 units undergo pre-shipment inspection (PSI). If there is an issue with LP3470IM5X-4.38, 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 LP3470IM5X-4.38 part is unused and in its original packaging.
Return procedure for LP3470IM5X-4.38:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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