Texas Instruments LP3470IM5-4.38

Overview

LP3470IM5-4.38 from Texas Instruments is a micropower voltage supervisor IC with factory-programmed 4.38 V ±1% reset threshold, open-drain active-low reset output, and externally programmable reset time-out via capacitor on SRT pin. It monitors VCC supply in microprocessor systems down to 0.5 V and ensures reliable power-on-reset (POR) in battery-powered equipment.

For engineers reviewing the LP3470IM5-4.38 datasheet, LP3470IM5-4.38 pinout, LP3470IM5-4.38 application, or LP3470IM5-4.38 equivalent, key selection criteria include reset threshold accuracy over temperature, quiescent current (16 µA typical), immunity to short VCC transients, and compatibility with standard SOT-23-5 PCB footprints.

Technical Context

The LP3470IM5-4.38 implements a precision bandgap-based voltage reference and comparator architecture to achieve ±1% reset threshold accuracy across –40°C to 85°C. Its internal hysteresis (15–65 mV) prevents chatter during brownout recovery.

Reset assertion is triggered when VCC falls below 4.38 V minus hysteresis; the open-drain Reset output remains low for a user-defined time-out period (tRP = 2000 × C1, where C1 in µF yields tRP in ms) after VCC rises above threshold. The SRT pin accepts ceramic capacitors ≥10 V rating for timing control.

Key Specifications

Pinout & Package

LP3470IM5-4.38 is housed in a 5-pin SOT-23 (DBV) package measuring 1.60 mm × 2.90 mm, compatible with standard reflow profiles (MSL Level-1, 260°C peak).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G33 and MAX6326UT44D, the LP3470IM5-4.38 offers tighter threshold accuracy (±1% vs ±2.5%), user-defined reset hold time, and lower minimum operating voltage (0.5 V vs 0.9 V), making it optimal for brownout-resilient, timing-flexible embedded systems.

Availability

LP3470IM5-4.38 is available at Aetrix Electronics and suitable for microprocessor power monitoring, portable medical devices, industrial PLC I/O modules, and smart metering endpoints requiring stable component supply and long-term manufacturability.

Supply support for LP3470IM5-4.38 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 LP3470IM5-4.38 belongs to TI's voltage supervisor product line, engineered for precision power monitoring in battery-powered and industrial systems where reset reliability, low IQ, and thermal stability are critical.

FAQ

What is the exact reset threshold voltage of the LP3470IM5-4.38?

The LP3470IM5-4.38 has a factory-programmed reset threshold of 4.38 V with ±1% accuracy over the full operating temperature range of –40°C to 85°C. This value is specified in the Electrical Characteristics table under VRTH and confirmed in the Mechanical, Packaging, and Orderable Information section where "LP3470IM5-4.38/NOPB" is explicitly listed among the orderable variants with 4.38 V threshold.

Can the LP3470IM5-4.38 operate with supply voltages below 1 V?

Yes, the LP3470IM5-4.38 guarantees valid reset output functionality down to VCC = 0.5 V, as stated in both the Features list ("Reset Valid Down to VCC = 0.5 V") and the Recommended Operating Conditions table. This enables use in ultra-low-voltage scenarios such as backup battery supervision or energy-harvesting systems where supply rails dip below conventional logic thresholds.

How is the reset time-out period set for the LP3470IM5-4.38?

The reset time-out period (tRP) of the LP3470IM5-4.38 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 a 200 ms delay. If no delay is needed, SRT must be left floating - no pullup or pulldown is permitted.

What package type and dimensions does the LP3470IM5-4.38 use?

The LP3470IM5-4.38 uses a 5-pin SOT-23 (DBV) package with nominal body dimensions of 1.60 mm × 2.90 mm. This is confirmed in the Device Information table and Package Option Addendum, where "SOT-23 (DBV) | 5" is listed for LP3470IM5-4.38/NOPB, and mechanical drawings specify DBV as the package drawing code.

Does the LP3470IM5-4.38 require an external pullup resistor on the Reset pin?

Yes, the LP3470IM5-4.38 features an open-drain Reset output (Pin 5), which requires an external pullup resistor to a valid logic rail (typically VCC). The datasheet specifies a recommended range of 0.68 kΩ to 68 kΩ, with 20 kΩ cited as typical. This resistor ensures proper logic-high state when Reset is inactive and limits sink current to ≤10 mA during assertion.