Bandgap Core: Supply Voltage Range 2.7V to 5.5V

Q: What is the main advantage of Bandgap Core over other voltage reference types?

Bandgap Core provides excellent temperature stability with relatively simple implementation, achieving temperature coefficients as low as 1-10 ppm/°C without requiring complex temperature compensation circuits or external components.

Q: Can Bandgap Core operate at low supply voltages?

Modern Bandgap Core designs can operate down to 1.8V supply voltage, though traditional designs typically require 2.5V or higher. Low-voltage operation requires specialized circuit topologies and may compromise some performance parameters.

Component Specifications

Definition

The Bandgap Core is a fundamental electronic component within voltage reference circuits that utilizes the temperature-dependent properties of semiconductor junctions to produce a stable reference voltage. It combines the negative temperature coefficient of a forward-biased diode with the positive temperature coefficient of the thermal voltage (kT/q) to achieve near-zero temperature drift. This component is essential for precision analog-to-digital converters, voltage regulators, and sensor interfaces where stable voltage references are critical for accurate signal processing and measurement.

Working Principle

The Bandgap Core operates on the principle of compensating two opposing temperature coefficients: the negative temperature coefficient of a forward-biased p-n junction diode (approximately -2 mV/°C) and the positive temperature coefficient of the thermal voltage VT = kT/q (approximately +0.085 mV/°C). By properly scaling and summing these voltages, typically through operational amplifier circuits and resistor networks, it produces a reference voltage (typically 1.25V) that remains nearly constant across temperature variations. Advanced implementations use curvature correction techniques and trimming to achieve temperature coefficients below 10 ppm/°C.

Materials

Silicon semiconductor substrate (typically p-type or n-type), silicon dioxide insulation layers, polysilicon resistors, aluminum or copper metallization layers, passivation layers (silicon nitride or silicon oxynitride), and bonding pads (gold or aluminum).

Technical Parameters

Parameter	Typical range	Notes & selection driver
Noise Voltage	10 μVrms to 100 μVrms (0.1Hz to 10Hz)
Output Voltage	1.25V ± 0.5%
Line Regulation	0.05%/V typical
Load Regulation	0.1% typical
Initial Accuracy	± 0.1% to ± 1%
Quiescent Current	50 μA to 500 μA
Long Term Stability	< 50 ppm/1000 hours
Supply Voltage Range	2.7V to 5.5V
Temperature Coefficient	< 50 ppm/°C
Operating Temperature Range	-40°C to +125°C

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 9001, IEC 60747, JEDEC JESD22

Parent Products

This component is used in the following industrial products

Reference Voltage Source

A stable voltage reference circuit that provides a precise and constant voltage for comparison in analog-to-digital conversion.

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Engineering Analysis

Risks & Mitigation

Temperature drift beyond specifications
Long-term output voltage drift
Noise injection from power supply
Electrostatic discharge damage
Package stress-induced parameter shift

FMEA Triads

Trigger: Process variations in resistor matching
Failure: Output voltage accuracy degradation
Mitigation: Implement laser trimming or digital calibration during production

Trigger: Temperature gradient across die
Failure: Increased temperature coefficient
Mitigation: Use symmetrical layout and thermal isolation structures

Trigger: Electromigration in metal interconnects
Failure: Long-term output voltage drift
Mitigation: Follow design rules for current density and use redundant vias

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.1% initial accuracy, ±50 ppm/°C temperature coefficient

Test Method

Four-point Kelvin measurement at multiple temperature points (-40°C, 25°C, 85°C, 125°C) with controlled thermal chamber, using precision digital multimeters with traceable calibration

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Bandgap Core

Manufacturer profiles associated with Bandgap Core.

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Frequently Asked Questions

What is the main advantage of Bandgap Core over other voltage reference types?

Bandgap Core provides excellent temperature stability with relatively simple implementation, achieving temperature coefficients as low as 1-10 ppm/°C without requiring complex temperature compensation circuits or external components.

Can Bandgap Core operate at low supply voltages?

Modern Bandgap Core designs can operate down to 1.8V supply voltage, though traditional designs typically require 2.5V or higher. Low-voltage operation requires specialized circuit topologies and may compromise some performance parameters.

How does Bandgap Core achieve temperature independence?

It combines the negative temperature coefficient of a forward-biased diode (approximately -2 mV/°C) with the positive temperature coefficient of thermal voltage (approximately +0.085 mV/°C) through precise scaling and summation, resulting in a composite voltage with near-zero temperature dependence.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Bandgap Core