Texas Instruments LP3470IM5X-4.38/NOPB

Overview

LP3470IM5X-4.38/NOPB from Texas Instruments is a micropower voltage supervisor IC with 4.38 V ±1% reset threshold, programmable reset time-out 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 and ensures reliable power-on-reset (POR) sequencing.

For engineers reviewing the LP3470IM5X-4.38/NOPB datasheet, LP3470IM5X-4.38/NOPB pinout, LP3470IM5X-4.38/NOPB application, or LP3470IM5X-4.38/NOPB equivalent, key selection criteria include reset threshold accuracy over temperature, low quiescent current (16 µA typical), immunity to short VCC transients, and SOT-23-5 package compatibility with space-constrained PCB layouts.

Technical Context

The LP3470IM5X-4.38/NOPB implements a precision bandgap-based voltage reference with ±1% threshold accuracy across –40°C to +85°C, coupled with hysteresis (15–65 mV) to prevent chatter during brownout recovery. Its internal comparator drives an open-drain N-channel MOSFET output stage.

Reset assertion is triggered when VCC falls below 4.38 V, and deassertion is delayed by a user-programmable time-out period (tRP = 2000 × C1, where C1 in µF yields tRP in ms). The SRT pin accepts ceramic capacitors ≥10 V rating for timing control, and the device remains functional even at VCC as low as 0.5 V.

Key Specifications

Pinout & Package

LP3470IM5X-4.38/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 compatible with standard reflow profiles (MSL Level-1, 260°C peak).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage supervisor applications.

Compared with TPS3808G33DBVR and MAX6326UT438+T, the LP3470IM5X-4.38/NOPB uniquely combines factory-trimmed 4.38 V accuracy, user-adjustable reset hold time, and sub-1 V operational capability - making it optimal for battery-backed and multi-rail embedded systems requiring precise, adaptable supervision.

Availability

LP3470IM5X-4.38/NOPB is available at Aetrix Electronics and suitable for microprocessor power monitoring, portable medical devices, industrial PLC I/O modules, and smart energy meters requiring stable component supply and long-term lifecycle support.

Supply support for LP3470IM5X-4.38/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 specializing in analog and embedded processing technologies, with leadership in power management, signal chain, and high-reliability ICs.

The LP3470 series was designed for cost-sensitive, space-constrained embedded systems requiring accurate, low-power voltage supervision - particularly in battery-operated, industrial, and computing applications where POR integrity is critical.

FAQ

What is the exact reset threshold voltage of the LP3470IM5X-4.38/NOPB?

The LP3470IM5X-4.38/NOPB 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 (VRTH parameter) and confirmed in the Mechanical, Packaging, and Orderable Information section of the datasheet. The threshold is trimmed during production and does not require external calibration.

How do I calculate the reset time-out period for the LP3470IM5X-4.38/NOPB?

The reset time-out period (tRP) for the LP3470IM5X-4.38/NOPB is calculated using the formula tRP (ms) = 2000 × C1, where C1 is the capacitance (in µF) connected between the SRT pin and GND. For example, a 100 nF (0.1 µF) capacitor yields a 200 ms delay. The LP3470IM5X-4.38/NOPB datasheet confirms this relationship in Section 7.3.1 and Table 1.

Can the LP3470IM5X-4.38/NOPB operate with supply voltages below 1 V?

Yes, the LP3470IM5X-4.38/NOPB guarantees reset functionality down to VCC = 0.5 V, as stated in Section 6.3 (Recommended Operating Conditions) and Section 6.5 (Electrical Characteristics). This enables reliable supervision during deep brownout conditions where other supervisors may fail to assert reset, ensuring safe shutdown in ultra-low-power systems.

What is the recommended pullup resistor value for the Reset pin of the LP3470IM5X-4.38/NOPB?

The LP3470IM5X-4.38/NOPB Reset pin requires an external pullup resistor between 0.68 kΩ and 68 kΩ, with 20 kΩ cited as typical in Section 7.3.3. This range ensures the output MOSFET stays within its 10 mA absolute maximum rating while maintaining logic-high levels despite leakage current (≤6 µA over temperature), as verified in the Electrical Characteristics table (R1 and ILEAK parameters).

Is the LP3470IM5X-4.38/NOPB pin-compatible with other variants in the LP3470 family?

Yes, all LP3470 variants-including LP3470IM5X-4.38/NOPB-use the identical 5-pin SOT-23 (DBV) package and share identical pinout, electrical behavior, and functional interface. The only difference is the factory-programmed reset threshold voltage; no PCB redesign is needed when substituting between LP3470IM5X-2.63/NOPB, LP3470IM5X-4.38/NOPB, or other members of the family.