Current Sources/Sinks

Product Specifications

Technical details and manufacturing context for Current Sources/Sinks

Definition

Current sources and sinks are fundamental electronic components within output stages and charge pump circuits that regulate and control current flow. Current sources deliver a constant current regardless of load variations, while current sinks absorb current from a circuit. In charge pump applications, they manage charging/discharging currents for capacitors, ensuring stable voltage multiplication or inversion with minimal ripple and high efficiency. These components are typically implemented using transistor-based circuits such as current mirrors or Wilson current sources, with feedback mechanisms to maintain constant current output despite voltage changes. Current sinks operate similarly but pull current from a node to ground or a reference voltage. In charge pumps, these components control the switching phases where capacitors are charged (sourced) and discharged (sinked) to transfer charge, enabling voltage conversion without inductors. The directory lists typical parameters for such components, including output current range (0.001–2 A), current accuracy (±0.5% at 25°C full scale), compliance voltage (0.5–40 V), supply voltage (5–36 V DC), quiescent current (0.5–5 mA), temperature coefficient (±50 ppm/°C over -40–85°C), operating temperature range (-40–85°C), output noise (10–100 µVrms, 10 Hz–100 kHz), load regulation (0.01–0.1% for load change 10–90%), line regulation (0.01–0.05 %/V for supply change), package type (SOT-23 to SOIC-8), and weight (0.1–0.5 g). These values are reference ranges and must be confirmed for the specific model and application. Materials typically include semiconductor silicon, copper interconnects, and dielectric materials. For selection, consider the required current range, accuracy, compliance voltage, supply voltage, and package. Verify model-specific values and standards with the legal manufacturer or supplier.

Working Principle

Current sources use transistor-based circuits like current mirrors or Wilson sources with feedback to maintain constant current despite voltage changes. Current sinks pull current from a node to ground or reference. In charge pumps, they control charging and discharging of capacitors, enabling voltage conversion without inductors.

Common Materials

Semiconductor silicon, Copper interconnects, Dielectric materials

Technical Parameters

Parameter	Typical range	Notes & selection driver
Output Current Range	0.001–2 A	Adjustable within range
Current Accuracy	±0.5 %	At 25°C, full scale
Compliance Voltage	0.5–40 V	Max voltage across current source
Supply Voltage	5–36 V DC	Single or dual supply
Quiescent Current	0.5–5 mA	At no load
Temperature Coefficient	±50 ppm/°C	Over -40–85°C
Operating Temperature Range	-40–85 °C	Industrial grade
Output Noise	10–100 µVrms	10 Hz–100 kHz
Load Regulation	0.01–0.1 %	For load change 10–90%
Line Regulation	0.01–0.05 %/V	For supply change
Package Type	SOT-23–SOIC-8	Surface mount
Weight	0.1–0.5 g	Depends on package

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

Components / BOM

Reference current generator Part
Provides stable reference current for mirroring in source/sink circuits

Material: Semiconductor
Current mirror transistors Part
Replicates reference current with high accuracy for sourcing/sinking operations

Material: Silicon
Feedback amplifier
Maintains constant current by adjusting transistor bias based on load conditions

Material: Semiconductor

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Current Sources/Sinks.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Output Stage/Charge Pump

View system integration details

Manufacturers of Current Sources/Sinks

Manufacturer profiles associated with Current Sources/Sinks.

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Frequently Asked Questions

What is the difference between a current source and a current sink?

A current source delivers a constant current to a load, while a current sink absorbs a constant current from a circuit node. Both maintain precise current levels regardless of voltage variations within their compliance range.

What are typical applications of current sources and sinks?

They are used in output stages of amplifiers, charge pump circuits for voltage conversion, and any circuit requiring precise current biasing or regulation.

What parameters should I consider when selecting a current source/sink?

Key parameters include output current range, current accuracy, compliance voltage, supply voltage, quiescent current, temperature coefficient, operating temperature range, output noise, load and line regulation, package type, and weight. Always verify these with the manufacturer for your specific application.

How do I verify the performance of a current source/sink?

Check the datasheet for the specific model and measure parameters such as output current accuracy, compliance voltage, and load regulation under your operating conditions. Confirm that the component meets your requirements and any applicable standards.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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temperature:	-40°C to +125°C (operational range for semiconductor components)
voltage range:	±5V to ±30V (typical supply voltage limits)
output current:	1mA to 1A (typical adjustable range)
current accuracy:	±0.1% to ±1% (typical precision range)
compliance voltage:	Up to 50V (maximum voltage across current source/sink)