Texas Instruments LP3470M5-2.83/NOPB

Overview

LP3470M5-2.83/NOPB from Texas Instruments is a micropower voltage supervisor IC with 2.83 V ±1% reset threshold, programmable reset timeout via external capacitor (t_RP = 2000 × C₁), open-drain active-low reset output, and operation down to V_CC = 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 LP3470M5-2.83/NOPB datasheet, LP3470M5-2.83/NOPB pinout, LP3470M5-2.83/NOPB application, or LP3470M5-2.83/NOPB equivalent, key selection criteria include reset threshold accuracy over temperature, low quiescent current (16 µA typ), immunity to short V_CC transients, and SOT-23-5 package compatibility with space-constrained embedded designs.

Technical Context

The LP3470M5-2.83/NOPB implements a precision bandgap reference and comparator-based supervision architecture with built-in hysteresis (15–65 mV) to prevent chatter during threshold crossing. Its reset assertion logic is triggered when V_CC falls below 2.83 V and remains asserted for a user-defined interval after recovery.

Reset timing is fully decoupled from V_CC via an external capacitor on the SRT pin, enabling delay tuning from ~1 ms to >3.5 ms across temperature (–20°C to 85°C). The open-drain Reset output requires an external pullup resistor (0.68–68 kΩ) and guarantees valid logic low down to 0.5 V supply.

Key Specifications

Pinout & Package

LP3470M5-2.83/NOPB is housed in a 5-pin SOT-23 (DBV) package measuring 1.60 mm × 2.90 mm, RoHS-compliant with lead finish CuSn, MSL Level-1, and tape-and-reel packaging (1000 pcs/reel).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G33DBVR and MAX6326UR29D3+, the LP3470M5-2.83/NOPB uniquely balances precision threshold (±1%), user-adjustable timeout, and ultra-low IQ in a standard SOT-23-5 - making it optimal for prototyping, multi-voltage platforms, and applications requiring fine-grained brownout response tuning.

Availability

LP3470M5-2.83/NOPB 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 design continuity.

Supply support for LP3470M5-2.83/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 leader delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.

The LP3470 series was designed specifically for high-accuracy, low-power voltage supervision in battery-operated and space-constrained embedded systems - emphasizing threshold stability, transient immunity, and minimal board area.

FAQ

What is the exact reset threshold voltage of LP3470M5-2.83/NOPB and how does it vary with temperature?

The LP3470M5-2.83/NOPB has a factory-trimmed reset threshold of 2.83 V with ±1% accuracy over the full operating temperature range of –20°C to 85°C. Per Section 6.5 of the datasheet, VRTH remains within 0.99×2.83 V to 1.01×2.83 V (2.8017 V to 2.8583 V) across that range. This tight tolerance eliminates need for system-level calibration and ensures consistent behavior in thermal cycling environments.

How do I calculate the reset timeout period for LP3470M5-2.83/NOPB using the external capacitor?

The reset timeout period (t_RP) for LP3470M5-2.83/NOPB is calculated using t_RP (ms) = 2000 × C₁ (µF), where C₁ is the capacitor value connected between Pin 1 (SRT) and GND. For example, a 100 nF (0.1 µF) capacitor yields t_RP = 200 ms. The datasheet confirms this relationship applies across –20°C to 85°C, with t_RP ranging from 1 ms to 3.5 ms depending on C₁ and temperature.

Can LP3470M5-2.83/NOPB operate reliably at very low supply voltages?

Yes - LP3470M5-2.83/NOPB guarantees valid reset assertion down to V_CC = 0.5 V, as specified in Section 6.3 (Recommended Operating Conditions) and verified in electrical characteristics (VOL test conditions). This enables robust supervision during deep brownout, battery end-of-life, or ultra-low-power wake-up sequences where other supervisors fail to assert reset cleanly.

What is the recommended pullup resistor value for the Reset output of LP3470M5-2.83/NOPB?

Texas Instruments specifies a pullup resistor (R1) between 0.68 kΩ and 68 kΩ for the open-drain Reset output of LP3470M5-2.83/NOPB. A typical value of 20 kΩ is recommended for most applications, balancing fast rise time, low power consumption, and sufficient noise margin. Section 7.3.3 confirms R1 must limit output MOSFET current below 10 mA while supplying leakage current (≤6 µA max).

Is LP3470M5-2.83/NOPB pin-compatible with other members of the LP3470 family?

Yes - all LP3470 variants, including LP3470M5-2.83/NOPB, use the identical 5-pin SOT-23 (DBV) package and share identical pinout (SRT, GND, V_CC1, V_CC, Reset). This allows drop-in replacement across threshold options (e.g., 2.63 V, 2.93 V, 3.08 V) without PCB changes, provided system-level timing and voltage margin requirements remain compatible.