Texas Instruments LP3470A400DBVR

Overview

LP3470A400DBVR from Texas Instruments is a micropower voltage supervisor IC with 4.0 V nominal reset threshold (V_IT−), ±1% accuracy over temperature, open-drain active-low RESET output, programmable delay via external capacitor (50 µs to 6.2 s), and ultra-low quiescent current of 0.3 µA - used for reliable power-on reset and brownout protection in microcontroller-based embedded systems.

For engineers reviewing the LP3470A400DBVR datasheet, LP3470A400DBVR pinout, LP3470A400DBVR application, or LP3470A400DBVR equivalent, key selection criteria include reset threshold tolerance, SRT-programmable delay range, VCC operating range down to 0.95 V, open-drain drive capability, and SOT-23-5 package compatibility with space-constrained PCB layouts.

Technical Context

The LP3470A400DBVR implements a precision bandgap-based voltage reference comparator with hysteresis (200 mV typical) to detect VCC falling below 4.0 V (V_IT−) and rising above 4.2 V (V_IT+). Its internal timing circuit uses the SRT pin's 500 kΩ typical resistance and external capacitor to generate a user-defined reset assertion period after threshold recovery.

It operates across –40°C to +125°C with guaranteed RESET validity down to VCC = 0.95 V, immunity to short VCC transients (≥10 µs pulse width at 5% overdrive), and open-drain output compatible with pull-up voltages up to 10 V - enabling flexible interfacing with diverse logic families and supply domains.

Key Specifications

Pinout & Package

LP3470A400DBVR 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 MAX6326UT40D3+, the LP3470A400DBVR uniquely combines 4.0 V precision threshold, nano-power operation, and fully programmable delay - making it optimal for designs requiring adaptive reset timing without sacrificing battery life or accuracy.

Availability

LP3470A400DBVR is available at Aetrix Electronics and suitable for industrial sensor transmitters, portable medical devices, building security controllers, and microcontroller-based edge nodes requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LP3470A400DBVR 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 real-time control ICs.

The LP3470A400DBVR belongs to TI's precision voltage supervisor product line, designed specifically for ultra-low-power, high-accuracy power monitoring in battery-operated and thermally demanding applications - emphasizing reliability, longevity, and minimal design overhead.

FAQ

What is the exact reset threshold voltage of LP3470A400DBVR?

The LP3470A400DBVR has a nominal negative-going input threshold (V_IT−) of 4.0 V with ±1% accuracy over –40°C to +125°C. This is factory-trimmed and specified in the Electrical Characteristics table; the corresponding positive-going threshold (V_IT+) is 4.2 V, yielding 200 mV hysteresis. The "400" in the part number explicitly denotes the 4.0 V option.

How do I configure the reset delay time for LP3470A400DBVR?

To configure the reset delay for LP3470A400DBVR, connect a capacitor between the SRT pin (Pin 1) and GND. Delay time t_D ≈ 619 × C_SRT (with C_SRT in µF and t_D in ms). For example, a 100 nF capacitor yields ~62 ms delay. Leaving SRT floating gives minimum 50 µs delay. Capacitor values must not exceed 10 µF to ensure full discharge during fault conditions.

Can LP3470A400DBVR operate with a 1.8 V supply?

No - LP3470A400DBVR requires VCC ≥ 0.95 V to assert RESET, but its 4.0 V reset threshold means it cannot supervise a 1.8 V rail. It is intended for monitoring higher-voltage domains (e.g., 3.3 V or 5 V supplies feeding an MCU). For 1.8 V supervision, select LP3470A180 or similar lower-threshold variant.

Is LP3470A400DBVR pin-compatible with LP3470?

Yes - LP3470A400DBVR is explicitly documented as pin-to-pin compatible with the legacy LP3470, sharing identical SOT-23-5 (DBV) footprint, pinout (SRT/GND/VCC1/VCC/RESET), and functional behavior. This enables drop-in replacement without PCB layout changes, while offering improved ±1% threshold accuracy and updated thermal specs.

What is the maximum recommended pull-up resistor value for the RESET pin of LP3470A400DBVR?

The RESET pin of LP3470A400DBVR is open-drain and supports pull-up resistors from 0.68 kΩ to 68 kΩ per datasheet guidance. A 20 kΩ resistor to VCC is typical for balancing rise time (<1 µs with 10 pF load) and leakage current. Higher values (e.g., 100 kΩ) increase rise time but reduce static current - acceptable if system timing budgets allow.