Texas Instruments LP3470M5-4.38/NOPB

Overview

LP3470M5-4.38/NOPB from Texas Instruments is a micropower voltage supervisor IC with 4.38 V ±1% reset threshold, programmable reset timeout via external capacitor, open-drain active-low reset output, and operation down to VCC = 0.5 V. It monitors microprocessor supply rails in battery-powered systems to ensure reliable power-on-reset and brownout protection.

For engineers reviewing the LP3470M5-4.38/NOPB datasheet, LP3470M5-4.38/NOPB pinout, LP3470M5-4.38/NOPB application, or LP3470M5-4.38/NOPB equivalent, key selection criteria include reset threshold accuracy over temperature, quiescent current (16 µA typical), SOT-23-5 package compatibility, and external capacitor–programmable delay timing.

Technical Context

The LP3470M5-4.38/NOPB implements a precision bandgap-based voltage reference with hysteresis (35 mV typical) and internal comparator to detect VCC drops below 4.38 V. Its reset assertion logic includes built-in immunity to short VCC transients and guarantees valid reset output down to 0.5 V supply.

Reset timeout is fully programmable via an external capacitor on the SRT pin using tRP = 2000 × C1 (C1 in µF, tRP in ms); no capacitor yields minimal delay. The open-drain Reset output requires an external pullup resistor (0.68–68 kΩ), supporting flexible interface voltage levels.

Key Specifications

Pinout & Package

LP3470M5-4.38/NOPB is housed in a 5-pin SOT-23 (DBV) package measuring 1.60 mm × 2.90 mm, optimized for space-constrained PCB layouts and compatible with standard pick-and-place assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LP3470M5-4.38/NOPB, TPS3808G33DBVR offers lower quiescent current but lacks threshold flexibility, while MAX6326UT438+T provides identical threshold accuracy but removes design adaptability in reset timing - making LP3470M5-4.38/NOPB optimal for systems requiring field-tunable POR behavior.

Availability

LP3470M5-4.38/NOPB is available at Aetrix Electronics and suitable for microprocessor supervision, portable medical instrumentation, industrial PLC modules, smart energy metering, and battery-backed embedded control requiring stable component supply and long-term manufacturability.

Supply support for LP3470M5-4.38/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 LP3470M5-4.38/NOPB belongs to TI's voltage supervisor product line, engineered for ultra-low-power, precision reset generation in space- and energy-constrained digital systems.

FAQ

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

The LP3470M5-4.38/NOPB has a factory-programmed reset threshold of 4.38 V with ±1% accuracy over the operating temperature range of –20°C to 85°C. This value is laser-trimmed during production and does not require external calibration. The hysteresis is 35 mV typical, preventing oscillation during slow VCC recovery near the threshold. LP3470M5-4.38/NOPB maintains this specification under all recommended operating conditions.

How is the reset timeout period set for the LP3470M5-4.38/NOPB?

The reset timeout period (tRP) of the LP3470M5-4.38/NOPB is set by connecting an external capacitor between the SRT pin (Pin 1) and GND. The relationship is tRP (ms) = 2000 × C1 (µF); for example, a 100 nF capacitor yields ~200 ms. Leaving SRT floating disables the delay, causing Reset to deassert immediately after VCC exceeds 4.38 V. LP3470M5-4.38/NOPB supports capacitors rated ≥10 V, such as ceramic X7R types.

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

Yes, the LP3470M5-4.38/NOPB features an open-drain Reset output (Pin 5) and requires an external pullup resistor to a valid logic-high voltage (typically VCC). Recommended values range from 0.68 kΩ to 68 kΩ; 20 kΩ is typical. This resistor ensures proper logic-high state when Reset is inactive and limits sink current to ≤10 mA during assertion. LP3470M5-4.38/NOPB does not include internal pullup.

Can the LP3470M5-4.38/NOPB operate with supply voltages below 1 V?

Yes, the LP3470M5-4.38/NOPB guarantees valid reset operation down to VCC = 0.5 V, including correct assertion and timing behavior. At 0.5 V, the Reset output remains functional with VOL ≤ 0.1 V at 30 µA sink current. This capability supports ultra-low-voltage brownout detection and safe shutdown sequencing in energy-harvesting and backup-power systems. LP3470M5-4.38/NOPB remains within specifications across its full 0.5 V to 5.5 V operating range.

Is the LP3470M5-4.38/NOPB pin-compatible with other members of the LP3470 family?

Yes, all LP3470 variants-including LP3470M5-4.38/NOPB-share identical 5-pin SOT-23 (DBV) packaging and pinout. The only differences are factory-set reset thresholds (e.g., 2.63 V, 2.93 V, 4.38 V, 4.63 V) and temperature grade (M-grade: 0°C to 0°C ambient; I-grade: –40°C to 85°C). LP3470M5-4.38/NOPB uses the same footprint, solder profile, and layout guidelines as other LP3470 devices, enabling drop-in replacement within the same threshold and temp grade group.