Texas Instruments LP3470M5-4.38

Overview

LP3470M5-4.38 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 via external capacitor. It monitors VCC supply voltage in microprocessor systems, asserts reset below threshold, and holds reset for user-defined delay after recovery - enabling reliable power-on-reset (POR) in battery-powered embedded devices.

For engineers reviewing the LP3470M5-4.38 datasheet, LP3470M5-4.38 pinout, LP3470M5-4.38 application, or LP3470M5-4.38 equivalent, key selection criteria include guaranteed reset assertion down to VCC = 0.5 V, ±1% threshold accuracy over temperature, 16 µA typical quiescent current, immunity to short VCC transients, and SOT-23-5 package compatibility with space-constrained PCB layouts.

Technical Context

The LP3470M5-4.38 implements a precision bandgap-based voltage reference comparator with built-in hysteresis (35 mV typical) and an internal timing circuit triggered by the SRT pin. Its reset output remains low for a programmable duration tRP = 2000 × C1 (C1 in µF, tRP in ms) after VCC rises above 4.38 V.

It operates across 0°C to 85°C ambient temperature, supports VCC from 0.5 V to 5.5 V, and features open-drain Reset output requiring external pullup (0.68–68 kΩ). The device is immune to sub-100 ns negative VCC transients and ensures valid reset signaling even during brownout conditions.

Key Specifications

Pinout & Package

LP3470M5-4.38 is housed in a 5-pin SOT-23 (DBV) package measuring 1.60 mm × 2.90 mm, optimized for high-density PCB layouts and reflow-compatible assembly.

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 LP3470M5-4.38 uniquely combines exact 4.38 V threshold, ±1% accuracy, user-programmable reset hold time, and open-drain output - making it optimal for applications demanding both precision voltage detection and configurable POR timing in minimal area.

Availability

LP3470M5-4.38 is available at Aetrix Electronics and suitable for microprocessor power monitoring, portable medical instrumentation, industrial I/O modules, and smart metering systems requiring stable component supply and long-term manufacturability.

Supply support for LP3470M5-4.38 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 specializing in analog and embedded processing technologies, with leadership in power management, signal chain, and high-reliability ICs.

The LP3470M5-4.38 belongs to TI's voltage supervisor product line, engineered for ultra-low-power, precision supply monitoring in battery-operated and industrial control systems where deterministic reset behavior is mission-critical.

FAQ

What is the reset threshold voltage of the LP3470M5-4.38?

The LP3470M5-4.38 has a factory-programmed reset threshold of 4.38 V with ±1% accuracy over the full operating temperature range (0°C to 85°C). This value is laser-trimmed during production and does not require external calibration. The LP3470M5-4.38 maintains this precision under varying load and supply conditions, ensuring consistent power-rail supervision across its lifetime.

How do I configure the reset time-out period for the LP3470M5-4.38?

The reset time-out period (tRP) of the LP3470M5-4.38 is set by connecting an external capacitor between Pin 1 (SRT) and GND. The relationship is tRP (ms) = 2000 × C1 (µF); for example, a 100 nF capacitor yields 200 ms. If no delay is needed, leave SRT floating. The LP3470M5-4.38 does not require any resistor or additional components for basic timeout configuration.

Does the LP3470M5-4.38 require an external pullup resistor on the Reset pin?

Yes, the LP3470M5-4.38 features an open-drain Reset output (Pin 5), which mandates an external pullup resistor to a valid logic-high voltage (typically VCC or another system rail). Recommended values range from 0.68 kΩ to 68 kΩ, with 20 kΩ being typical. Without this resistor, the LP3470M5-4.38 Reset signal cannot transition to high, rendering the supervisory function nonfunctional.

Can the LP3470M5-4.38 operate reliably at very low supply voltages?

Yes, the LP3470M5-4.38 guarantees valid reset assertion down to VCC = 0.5 V, enabling robust brownout detection even during deep discharge of primary batteries or supercapacitors. Its internal circuitry remains functional and the Reset output stays low until VCC recovers above 4.38 V - a capability confirmed across the full 0°C to 85°C operating range and critical for data-safe shutdown in LP3470M5-4.38-based systems.

Is the LP3470M5-4.38 RoHS compliant and lead-free?

Yes, the LP3470M5-4.38/NOPB variant is RoHS compliant and lead-free, with "NOPB" denoting lead-free finish (CU SN) and green packaging per TI's environmental standards. It meets JEDEC MSL Level-1 moisture sensitivity classification and is qualified for standard reflow soldering processes. The LP3470M5-4.38 is supplied in tape-and-reel format (1000 pcs/reel) with Q3 pin-one quadrant orientation.