Charge Pump Switches: Current Capacity Up to 2A

Component Specifications

Definition

Charge pump switches are semiconductor-based switching devices integrated within charge pump circuits, which are DC-DC converters that use capacitors to store and transfer charge. These switches control the timing and sequence of capacitor charging and discharging phases, enabling efficient voltage multiplication, inversion, or regulation without inductors. They are critical for managing power delivery in low-power and space-constrained applications, such as in integrated circuits, where they facilitate functions like voltage boosting for displays or biasing in analog circuits.

Working Principle

Charge pump switches operate by alternately connecting capacitors to input and output voltages in a controlled sequence. During the charging phase, switches close to connect capacitors to the input voltage, storing charge. In the transfer phase, switches reconfigure to connect capacitors in series or parallel with the output, transferring stored charge to achieve desired voltage levels (e.g., doubling or inverting). This switching is typically driven by clock signals from oscillators, with MOSFETs (like NMOS or PMOS) serving as the switch elements due to their fast switching speeds and low on-resistance, minimizing power loss.

Materials

Silicon (for semiconductor substrates), with materials like polysilicon, silicon dioxide (SiO2), and metal layers (e.g., aluminum, copper) for interconnects and gates. Advanced versions may use gallium nitride (GaN) or silicon carbide (SiC) for higher efficiency and temperature tolerance.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Package Type	SOT-23, QFN, DFN
On Resistance	Less than 0.1 ohm
Voltage Rating	3.3V to 24V
Current Capacity	Up to 2A
Switching Frequency	100 kHz to 2 MHz
Operating Temperature	-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

IEC 60747, JEDEC standards

Parent Products

This component is used in the following industrial products

Charge Pump & Loop Filter

A critical analog circuit block within a Clock Data Recovery (CDR) system that converts phase/frequency error information into a control voltage for the Voltage-Controlled Oscillator (VCO).

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Engineering Analysis

Risks & Mitigation

Overheating from high current loads
Voltage spikes damaging semiconductor layers
Electromagnetic interference (EMI) from switching noise
Compatibility issues with circuit designs

FMEA Triads

Trigger: Excessive current draw or poor heat dissipation
Failure: Thermal runaway leading to component burnout
Mitigation: Implement current limiting, use heat sinks, and ensure proper PCB layout for cooling.

Trigger: Voltage transients from power supply fluctuations
Failure: Dielectric breakdown in semiconductor materials
Mitigation: Add protection circuits like snubbers or TVS diodes, and adhere to voltage rating specifications.

Trigger: Manufacturing defects in semiconductor layers
Failure: Increased on-resistance or short circuits
Mitigation: Follow strict quality control standards (e.g., ISO 9001) and conduct thorough testing during production.

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±5% for voltage output under specified conditions

Test Method

Electrical testing per IEC 60747, including switch timing, on-resistance measurement, and thermal cycling tests.

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 Charge Pump Switches

Manufacturer profiles associated with Charge Pump Switches.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What is the primary function of a charge pump switch?

The primary function is to control the switching sequence in charge pump circuits, enabling efficient voltage conversion (e.g., boosting or inverting) by managing capacitor charge and discharge cycles.

How do charge pump switches differ from other types of switches?

They are optimized for high-frequency switching in capacitive circuits, with low on-resistance and fast response times, unlike mechanical switches or general-purpose transistors used in different applications.

What are common failure modes for charge pump switches?

Common failures include overheating due to excessive current, voltage spikes causing breakdown, and wear from prolonged high-frequency operation, leading to increased resistance or short circuits.

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.

Charge Pump Switches