Texas Instruments LP3470M5-4.00

Overview

LP3470M5-4.00 from Texas Instruments is a micropower voltage supervisor IC designed for power-on-reset (POR) and brownout detection in microprocessor systems. It features a factory-programmed 4.00 V ±1% reset threshold, programmable reset time-out via external capacitor (t_RP = 2000 × C₁), open-drain active-low reset output, and operation down to V_CC = 0.5 V - enabling reliable supervision in battery-powered and low-voltage embedded applications.

For engineers reviewing the LP3470M5-4.00 datasheet, LP3470M5-4.00 pinout, LP3470M5-4.00 application, or LP3470M5-4.00 equivalent, key selection considerations include its 4.00 V reset threshold accuracy over temperature, 16 µA typical quiescent current, SOT-23-5 package compatibility, and immunity to short V_CC transients - critical for stable microcontroller startup and system-level power integrity validation.

Technical Context

The LP3470M5-4.00 implements a precision bandgap-based voltage reference with hysteresis (V_HYST = 15–65 mV) to prevent chatter during threshold crossing. Its internal comparator continuously monitors V_CC against the 4.00 V threshold and asserts Reset low when V_CC falls below VRTH − V_HYST, holding it low for a user-defined t_RP after recovery.

Reset assertion is guaranteed down to V_CC = 0.5 V, and the open-drain output requires an external pullup resistor (0.68–68 kΩ). The device uses no internal timing capacitor - delay is fully determined by the external SRT-to-GND capacitor, enabling flexible POR timing from sub-millisecond to seconds.

Key Specifications

Pinout & Package

LP3470M5-4.00 is housed in a 5-pin SOT-23 (DBV) package measuring 1.60 mm × 2.90 mm, optimized for space-constrained PCB layouts and automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G33 and MAX6326UT40D3+, the LP3470M5-4.00 uniquely combines factory-trimmed 4.00 V accuracy, user-programmable reset hold time, ultra-low 16 µA quiescent current, and open-drain output - making it optimal for battery-sensitive, timing-flexible, and multi-rail reset coordination use cases.

Availability

LP3470M5-4.00 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 obsolescence management.

Supply support for LP3470M5-4.00 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 leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in high-reliability industrial and automotive ICs.

The LP3470 family was engineered specifically for cost-sensitive, space-constrained microcontroller-based systems needing accurate, low-power, and flexible power-supply supervision - targeting portable, industrial, and metering applications.

FAQ

What is the exact reset threshold voltage of the LP3470M5-4.00?

The LP3470M5-4.00 has a factory-programmed reset threshold of 4.00 V with ±1% accuracy over the operating temperature range of −20°C to +85°C. This value is specified as VRTH = 4.00 V in the Electrical Characteristics table, and measured tolerance is maintained via precision bandgap reference trimming during production test. The LP3470M5-4.00 does not support user adjustment of this threshold.

How do I configure the reset time-out period for the LP3470M5-4.00?

Configure the reset time-out period (t_RP) by connecting a capacitor between Pin 1 (SRT) and GND. Use the formula t_RP (ms) = 2000 × C₁ (µF); for example, a 100 nF capacitor yields 200 ms. Ceramic capacitors rated ≥10 V are recommended. Leaving SRT floating disables the delay, causing Reset to deassert immediately after V_CC exceeds 4.00 V. The LP3470M5-4.00 contains no internal timing element.

Does the LP3470M5-4.00 require an external pullup resistor on the Reset pin?

Yes, the LP3470M5-4.00 features an open-drain Reset output and requires an external pullup resistor to V_CC. Recommended values range from 0.68 kΩ to 68 kΩ, with 20 kΩ being typical. This resistor ensures a valid logic-high level when Reset is inactive and limits sink current to ≤4 mA during assertion. Without it, the Reset signal remains undefined, compromising system reliability. The LP3470M5-4.00 cannot drive a high state internally.

Can the LP3470M5-4.00 operate reliably at V_CC = 0.5 V?

Yes, the LP3470M5-4.00 guarantees valid Reset output functionality down to V_CC = 0.5 V - meaning it continues asserting Reset low even during deep brownout conditions. This capability is explicitly tested and specified in the Electrical Characteristics table under VOL and Reset validity. It ensures fail-safe behavior in ultra-low-power systems where supply collapse may occur gradually, distinguishing the LP3470M5-4.00 from many competitors with higher minimum operating voltages.

Is the LP3470M5-4.00 RoHS compliant and lead-free?

Yes, the LP3470M5-4.00/NOPB variant is RoHS compliant and lead-free, as confirmed in TI's Package Option Addendum. "NOPB" denotes "No Lead (Pb)-Free", and the device carries Green (RoHS & no Sb/Br) eco plan designation with CU SN (copper-tin) lead finish. It meets JEDEC MSL Level-1 moisture sensitivity classification and is qualified for standard Pb-free reflow profiles. The LP3470M5-4.00 is not offered in leaded versions.