Texas Instruments LP3470A463DBVR

Overview

LP3470A463DBVR 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 4.63 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. It ensures reliable system initialization in battery-powered industrial sensors.

For engineers reviewing the LP3470A463DBVR datasheet, LP3470A463DBVR pinout, LP3470A463DBVR application, or LP3470A463DBVR equivalent, key selection criteria include reset threshold tolerance, supply voltage operating range (0.95–10 V), SRT-based timing flexibility, immunity to VCC transients, and compatibility with low-voltage microcontrollers requiring valid RESET down to 0.95 V.

Technical Context

The LP3470A463DBVR implements a precision bandgap reference and comparator architecture to monitor VCC against its fixed 4.63 V falling-threshold (VIT−) and 4.83 V rising-threshold (VIT+), delivering 200 mV hysteresis. Its internal SRT pin resistance (475 kΩ typ.) enables predictable RC-based reset timeout tuning from 50 µs (SRT floating) up to 6.2 s (10 µF capacitor).

It operates across –40°C to +125°C with guaranteed RESET assertion down to VCC = 0.95 V and supports open-drain interfacing to any pull-up voltage ≤10 V. The device is immune to short VCC transients (e.g., <10 µs pulses with ≤5% overdrive) and requires no external components beyond a pull-up resistor and optional SRT capacitor.

Key Specifications

Pinout & Package

LP3470A463DBVR is housed in a 5-pin SOT-23 (DBV) package measuring 1.60 mm × 2.90 mm, optimized for space-constrained 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 TLV803EC46DBVR and MAX6326US46D3+, the LP3470A463DBVR delivers superior threshold accuracy (±1% vs. ±2%), lowest IQ (0.3 µA), and unique SRT-based timing adaptability - making it optimal for next-generation energy-harvesting and battery-critical systems where precision and flexibility are non-negotiable.

Availability

LP3470A463DBVR is available at Aetrix Electronics and suitable for industrial sensor nodes, smart building controllers, factory automation I/O modules, and portable medical monitors requiring stable component supply with full lifecycle support.

Supply support for LP3470A463DBVR 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 decades of leadership in power management and precision analog ICs.

The LP3470A series was developed to address demand for ultra-low-power, high-accuracy voltage supervisors in battery-operated and safety-critical industrial systems - emphasizing nano-power operation, factory-trimmed thresholds, and robust transient immunity.

FAQ

What is the exact reset threshold voltage of LP3470A463DBVR?

The LP3470A463DBVR has a factory-programmed negative-going input threshold (VIT−) of 4.63 V, with ±1% accuracy over –40°C to +125°C. Its corresponding positive-going threshold (VIT+) is 4.83 V, yielding 200 mV of built-in hysteresis. This precise threshold is laser-trimmed during production and does not require external calibration.

How do I calculate the reset delay time for LP3470A463DBVR using an external capacitor?

For LP3470A463DBVR, the reset delay time tD (in milliseconds) 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 capacitor yields ~61.9 ms delay. The formula assumes typical internal SRT resistance (475 kΩ) and accounts for the 50 µs base delay when SRT is left floating.

Can LP3470A463DBVR operate with a supply voltage below 1 V?

Yes - LP3470A463DBVR guarantees valid RESET assertion down to VCC = 0.95 V, enabling reliable supervision during deep brownout events. However, the device does not function *below* 0.95 V: RESET becomes undefined, and internal circuitry ceases operation. For systems requiring sub-0.95 V monitoring, a different supervisor with lower VCC min must be selected.

Is LP3470A463DBVR pin-compatible with the original LP3470?

Yes - LP3470A463DBVR is explicitly designed as a pin-to-pin compatible upgrade to the LP3470. Both use identical SOT-23-5 (DBV) packaging and share identical pinout, electrical interface, and functional behavior. The LP3470A variant improves threshold accuracy (±1% vs. ±2%) and reduces quiescent current (0.3 µA vs. 0.35 µA), with no PCB layout changes required.

What is the maximum capacitor value allowed on the SRT pin of LP3470A463DBVR?

The recommended maximum capacitor on the SRT pin of LP3470A463DBVR is 10 µF. Larger values risk incomplete discharge during short voltage faults, causing inaccurate delay timing upon recovery. TI specifies that 10 µF yields ~6.2 s delay and ensures full discharge within typical fault durations; exceeding this value requires validation of discharge time under worst-case VCC fault profiles.