Texas Instruments LP3470A263DBVR

Overview

LP3470A263DBVR from Texas Instruments is an ultra-low-power voltage supervisor IC designed for precise power-on reset and brownout detection in microcontroller systems. It features a factory-programmed 2.63 V reset threshold (VIT−), ±1% accuracy over temperature, 0.3 µA typical quiescent current, open-drain active-low RESET output, and programmable reset delay via external capacitor on SRT pin - used in battery-powered instrumentation and industrial edge sensors.

For engineers reviewing the LP3470A263DBVR datasheet, LP3470A263DBVR pinout, LP3470A263DBVR application, or LP3470A263DBVR equivalent, key selection considerations include reset threshold tolerance at −40°C to 125°C, minimum VCC operation down to 0.95 V, SRT capacitor-based timing flexibility (50 µs to 6.2 s), and immunity to sub-10 µs VCC transients with ≥5% overdrive.

Technical Context

The LP3470A263DBVR implements a precision bandgap reference and comparator-based supervision architecture with built-in hysteresis (100 mV typ. for 2.63 V variant) to prevent chatter during supply recovery. Its internal RSRT resistor (500 kΩ typ.) forms a time constant with the external SRT capacitor to define the reset assertion hold time after VCC exceeds VIT+.

It operates as a standalone supervisory node - monitoring only VCC (not separate VDD/VIO rails) - with no enable input or watchdog functionality. The open-drain RESET output requires an external pull-up (0.68–68 kΩ) and remains valid down to VCC = 0.95 V, enabling reliable reset assertion even during deep brownout conditions.

Key Specifications

Pinout & Package

LP3470A263DBVR is housed in a 5-pin SOT-23 (DBV) package measuring 1.60 mm × 2.90 mm, optimized for space-constrained PCB layouts in portable and industrial modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G26DBVR and MAX6326LT26D3+T, LP3470A263DBVR uniquely delivers nano-power operation *with* full timing programmability in the same 5-pin SOT-23 footprint - enabling one-part solutions for diverse reset timing needs across product variants without PCB redesign.

Availability

LP3470A263DBVR is available at Aetrix Electronics and suitable for industrial sensor nodes, portable medical monitors, and building security controllers requiring stable component supply, long-lifecycle support, and guaranteed parametric compliance to TI's production data sheet SNVSBF5C.

Supply support for LP3470A263DBVR 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 designing analog ICs, embedded processors, and system solutions for industrial, automotive, and personal electronics markets.

The LP3470A263DBVR belongs to TI's precision voltage supervisor product line, engineered specifically for ultra-low-power, high-accuracy power monitoring in battery-operated and energy-sensitive embedded systems.

FAQ

What is the exact reset threshold voltage of LP3470A263DBVR and how stable is it over temperature?

The LP3470A263DBVR has a factory-programmed negative-going input threshold (VIT−) of 2.63 V with ±1% accuracy over the full operating temperature range of −40°C to 125°C. This specification is guaranteed by design and characterization per TI's SNVSBF5C datasheet, and measured hysteresis is 100 mV (typ.), ensuring robust noise margin during supply recovery. The LP3470A263DBVR maintains this precision without external calibration components.

Can LP3470A263DBVR operate with supply voltages below 1.0 V, and what happens to RESET output behavior?

Yes - LP3470A263DBVR guarantees RESET remains valid down to VCC = 0.95 V, meaning it will assert and hold the active-low RESET signal even as the supply collapses into deep brownout. Below 0.95 V, the device ceases functional operation, but the RESET pin stays low until VCC rises above the threshold plus hysteresis and the programmed delay tD expires. This behavior is explicitly characterized and guaranteed in the Electrical Characteristics table of the LP3470A263DBVR datasheet.

How do I calculate the reset delay time for LP3470A263DBVR when using a specific capacitor on the SRT pin?

The reset delay tD (in milliseconds) for LP3470A263DBVR is calculated as tD = 619 × CSRT, where CSRT is the capacitor value in microfarads connected between SRT (Pin 1) and GND. For example, a 100 nF (0.1 µF) capacitor yields ~61.9 ms delay. This linear approximation is derived from the internal 500 kΩ RSRT and is valid for capacitors ≤10 µF. The LP3470A263DBVR datasheet confirms this relationship in Section 8.3.1 and Figure 7.

Is LP3470A263DBVR pin-compatible with earlier TI supervisors like LP3470, and what are the key functional improvements?

Yes - LP3470A263DBVR is pin-to-pin compatible with the legacy LP3470, sharing identical SOT-23-5 (DBV) pinout and footprint. Key improvements in the LP3470A263DBVR include tighter reset threshold accuracy (±1% vs. ±1.5% for LP3470), lower quiescent current (0.3 µA vs. 0.35 µA typ.), and enhanced transient immunity. These upgrades are documented in TI's revision history (SNVSBF5C, May 2020) and confirmed in the Device Comparison Table.

What external components are mandatory for basic LP3470A263DBVR operation, and what values are recommended?

Two external components are mandatory for LP3470A263DBVR: (1) an external pull-up resistor on the RESET pin (Pin 5), recommended at 20 kΩ to VCC for most applications; and (2) a 0.1-µF ceramic bypass capacitor placed close to the VCC pin (Pin 4) for noise suppression. If programmable delay is required, a capacitor must also be connected between SRT (Pin 1) and GND. These requirements are specified in Sections 9.2.1 and 11.1 of the LP3470A263DBVR datasheet.