Analog Devices Inc./Maxim Integrated LM4050BIM3-5.0+

Overview

LM4050BIM3-5.0+ from Maxim Integrated is a precision 5.000V shunt voltage reference in SC70-3 package, featuring ±10mV initial accuracy (0.2%), ±15ppm/°C temperature coefficient over –40°C to +125°C, 60µA–15mA operating current range, and 80µVRMS wideband noise (10Hz–10kHz). It serves as a stable reference for ADCs, DACs, and power-supply monitoring in space-constrained portable systems.

For engineers reviewing the LM4050BIM3-5.0+ datasheet, LM4050BIM3-5.0+ pinout, LM4050BIM3-5.0+ application, or LM4050BIM3-5.0+ equivalent, key selection criteria include guaranteed 5.000V output tolerance at full temperature range, no external capacitor requirement, low dynamic impedance (≤1.1Ω), micropower operation down to 60µA, and SC70 footprint compatibility with high-density PCB layouts.

Technical Context

The LM4050BIM3-5.0+ uses a laser-trimmed bandgap core to deliver stable reverse breakdown voltage without series pass elements. Its two-terminal shunt architecture sinks variable current to maintain regulation, eliminating need for output capacitors while tolerating arbitrary capacitive loads.

Designed for high-accuracy analog signal chains, it guarantees performance across –40°C to +125°C with ≤12mV reverse voltage change over 1–15mA shunt current and long-term stability of 120ppm after 1000 hours. The device operates with forward clamp at ~0.7V below ground up to 10mA.

Key Specifications

Pinout & Package

LM4050BIM3-5.0+ is housed in a 3-pin SC70 surface-mount package (1.8mm × 1.8mm), 50% smaller than SOT23, optimized for high-density portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLVH431ACDBVR and REF3050AIDBZR, the LM4050BIM3-5.0+ offers true two-terminal shunt operation with no minimum load, superior thermal stability (±15ppm/°C vs. ±50ppm/°C), and smallest SC70 footprint-making it optimal for ultra-compact, micropower, fixed-voltage reference designs.

Availability

LM4050BIM3-5.0+ is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered data loggers, and industrial process controllers requiring stable component supply with RoHS-compliant packaging and full temperature-range validation.

Supply support for LM4050BIM3-5.0+ 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

Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications.

The LM4050 series targets space-constrained, high-accuracy voltage reference needs in portable and harsh-environment systems-emphasizing micropower operation, SC70 miniaturization, and guaranteed performance from –40°C to +125°C.

FAQ

What is the guaranteed output voltage tolerance of LM4050BIM3-5.0+ over its full operating temperature range?

The LM4050BIM3-5.0+ guarantees ±0.7% total output voltage tolerance over –40°C to +125°C, combining its ±0.2% initial accuracy and ±50ppm/°C temperature coefficient. At 5.000V nominal, this equates to ±35mV maximum deviation, verified across production testing and design validation per Maxim's datasheet specifications.

Does LM4050BIM3-5.0+ require an external output capacitor for stability?

No, the LM4050BIM3-5.0+ does not require an external output capacitor. Its internal design ensures unconditional stability with any capacitive load, including 0µF. This eliminates BOM cost, board area, and reliability risks associated with external capacitors-confirmed in the datasheet's "Output Capacitance" section and typical operating characteristics.

What is the minimum operating current for LM4050BIM3-5.0+, and why is it critical?

The LM4050BIM3-5.0+ requires a minimum shunt current of 60µA to maintain regulation. Below this threshold, output voltage deviates from specification. This value is critical for battery-powered designs using high-value source resistors-it defines the upper bound of RS in the typical operating circuit and directly impacts system standby current and battery lifetime.

How does the pin configuration of LM4050BIM3-5.0+ differ from standard three-terminal references?

The LM4050BIM3-5.0+ uses a two-terminal shunt topology with Pin 3 designated N.C. (no connection). Pins 1 (+) and 2 (−) form the active reference terminals; Pin 3 must remain unconnected or tied to Pin 2. This differs from three-terminal series references that require separate input, output, and ground pins-and avoids misinterpretation as a three-terminal device in schematic capture.

Can LM4050BIM3-5.0+ be used in applications requiring reverse polarity protection?

Yes-the LM4050BIM3-5.0+ clamps to approximately one diode drop (≈0.7V) below ground when forward-biased with up to 10mA, providing inherent reverse-polarity protection for downstream circuitry. This behavior is documented in the "Detailed Description" and "Absolute Maximum Ratings" sections, making it suitable for ruggedized industrial interfaces where supply reversal may occur.