Texas Instruments LP3470M5-2.63/NOPB

Overview

LP3470M5-2.63/NOPB from Texas Instruments is a micropower voltage supervisor IC designed for precise power-on-reset (POR) and brownout detection in microprocessor systems. It features a factory-programmed 2.63 V ±1% reset threshold, programmable reset time-out via external capacitor (t_RP = 2000 × C₁), open-drain active-low reset output, 16 µA typical quiescent current, and valid reset assertion down to V_CC = 0.5 V - enabling reliable operation in battery-powered embedded controllers.

For engineers reviewing the LP3470M5-2.63/NOPB datasheet, LP3470M5-2.63/NOPB pinout, LP3470M5-2.63/NOPB application, or LP3470M5-2.63/NOPB equivalent, this page delivers verified electrical specifications, SOT-23-5 pin mapping, real-world timing behavior under V_CC transients, and validated alternative options for 2.63 V supervisor designs requiring low I_CC and hysteresis immunity.

Technical Context

The LP3470M5-2.63/NOPB implements a precision bandgap-based voltage reference with ±1% threshold accuracy over –20°C to 85°C, coupled with internal hysteresis (15–65 mV) to prevent chatter during slow-rising or noisy supply conditions. Its reset assertion logic is triggered by V_CC falling below 2.63 V and held low for a user-defined duration after recovery.

Reset timing is fully decoupled from V_CC supply variations: t_RP depends solely on external capacitor value (e.g., 1 nF → 2 ms typical), while delay from V_CC fall to Reset assertion is ≤300 µs across temperature. The open-drain output requires an external pullup (0.68–68 kΩ) and sinks up to 4 mA at V_CC ≥ VRTH − 100 mV.

Key Specifications

Pinout & Package

LP3470M5-2.63/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 LP3470M5-2.63/NOPB, TPS3808G125DBVR offers lower quiescent current and eliminates capacitor placement complexity, while MAX6326UT26D3+ provides wider temperature range and push-pull output - both require layout changes and trade off programmability for integration or ruggedness.

Availability

LP3470M5-2.63/NOPB is available at Aetrix Electronics and suitable for microprocessor power monitoring, portable medical devices, industrial PLC I/O modules, and smart sensor nodes requiring stable component supply with guaranteed long-term sourcing.

Supply support for LP3470M5-2.63/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 specializing in analog, embedded processing, and connectivity technologies with over 50 years of innovation in power management and signal chain solutions.

The LP3470 series belongs to TI's precision voltage supervisor product line, engineered specifically for high-accuracy, low-power power-on-reset and brownout protection in resource-constrained embedded systems.

FAQ

What is the exact reset threshold voltage of LP3470M5-2.63/NOPB and how stable is it over temperature?

The LP3470M5-2.63/NOPB has a factory-programmed reset threshold of 2.63 V with ±1% accuracy over the full operating temperature range of –20°C to 85°C. This stability is achieved through precision bandgap reference design and on-die trimming, ensuring consistent POR activation without external calibration across industrial environments.

How do I configure the reset time-out period for LP3470M5-2.63/NOPB?

To configure the reset time-out period for LP3470M5-2.63/NOPB, connect a ceramic capacitor (rated ≥10 V) between Pin 1 (SRT) and GND. The time-out duration follows t_RP (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 V_CC exceeds 2.63 V.

Does LP3470M5-2.63/NOPB require an external pullup resistor on the Reset pin?

Yes, LP3470M5-2.63/NOPB requires an external pullup resistor on the Reset pin because its output is open-drain. TI specifies a range of 0.68 kΩ to 68 kΩ; a typical value is 20 kΩ connected to the same V_CC rail. This ensures proper logic-high level while limiting sink current to ≤4 mA during reset assertion.

Can LP3470M5-2.63/NOPB operate reliably during brief power supply glitches?

Yes, LP3470M5-2.63/NOPB is specifically designed to reject short-duration negative-going V_CC transients. Its internal architecture suppresses reset pulses for glitches under 100 ns and up to 200 mV below the 2.63 V threshold, as confirmed in Figure 6 of the datasheet. Adding a 0.1 µF bypass capacitor near V_CC further enhances immunity.

What is the minimum V_CC voltage at which LP3470M5-2.63/NOPB can still assert a valid reset signal?

LP3470M5-2.63/NOPB guarantees valid reset assertion down to V_CC = 0.5 V, as specified in the Recommended Operating Conditions table. This capability ensures robust brownout detection and controlled shutdown even during deep battery discharge or unregulated supply collapse - a key advantage over many competing supervisors.