Analog Devices Inc. ADP3604AR

Overview

ADP3604AR from Analog Devices is a switched capacitor voltage converter designed as a regulated negative voltage inverter, delivering –3.0 V (±3%) at up to 120 mA output current from a +4.5 V to +6.0 V input supply, with no inductor required and internal 240 kHz oscillator enabling compact 10 µF external capacitors.

For engineers reviewing the ADP3604AR datasheet, ADP3604AR pinout, ADP3604AR application, or ADP3604AR equivalent, key selection considerations include its SO-8 package, shutdown control timing (<5 ms), load regulation performance (1.5 mV/mA), and charge-pump topology suitability for portable instrumentation and battery-powered systems requiring low-noise negative rails.

Technical Context

The ADP3604AR implements a two-phase switched-capacitor inverter architecture using internal MOSFET switches controlled by a 240 kHz oscillator (yielding 120 kHz effective switching frequency) to alternately charge CP+–CP− and transfer charge to VOUT. Regulation is achieved via feedback-controlled ON-resistance of the S3 switch referenced to VSENSE.

It operates without magnetic components, relying on low-ESR ceramic or tantalum capacitors (C1–C3) for charge storage and filtering; VSENSE enables remote sensing to compensate for PCB trace IR drop, and shutdown mode reduces quiescent current to 1.5 mA while disabling the oscillator and output stage.

Key Specifications

Pinout & Package

ADP3604AR is housed in an 8-pin SOIC (SO-8) package with 1.27 mm pitch, 5.0 mm × 6.2 mm body, and exposed pad not present. Pin 6 is NC (no internal connection); all other pins have defined electrical roles.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar switched-capacitor inverter applications.

Compared with ADP3604AR, ADP3603AR offers identical functionality at reduced current capability and cost, while MAX680ESA+ provides higher output voltage but sacrifices efficiency, ripple performance, and switching speed-making ADP3604AR optimal for applications demanding 120 mA, low ripple, and compact 10 µF capacitors.

Availability

ADP3604AR is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered audio systems, and computer peripherals requiring stable component supply, consistent SO-8 sourcing, and long-term industrial lifecycle support.

Supply support for ADP3604AR 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

Analog Devices is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control.

The ADP360x family was engineered specifically for compact, inductorless negative voltage generation in portable and battery-critical systems-emphasizing regulation accuracy, low quiescent power, and ease of integration.

FAQ

What is the maximum output current specification for the ADP3604AR?

The ADP3604AR delivers up to 120 mA of continuous output current while maintaining ±3% output voltage accuracy across temperature and line variations. This rating assumes proper thermal management, use of low-ESR capacitors (≥10 µF), and input voltage within the +4.5 V to +6.0 V range. Exceeding 120 mA may degrade regulation or trigger thermal shutdown in sustained operation.

Can the ADP3604AR generate output voltages other than –3.0 V?

The ADP3604AR is factory-trimmed for a nominal –3.0 V regulated output. While unregulated outputs up to –VIN can be achieved by grounding VSENSE (Pin 5), and adjustable regulation (e.g., –4.0 V) is possible using an external resistor between VSENSE and VOUT per Figure 20, these configurations sacrifice accuracy and load regulation. For guaranteed performance at non-standard voltages, contact Analog Devices or consider custom-programmed alternatives.

What capacitor types and values are recommended for stable operation of the ADP3604AR?

Analog Devices recommends 10 µF multilayer ceramic capacitors (MLCCs) for C1 (input), C2 (pump), and C3 (output), with low ESR (<150 mΩ). Tantalum capacitors (e.g., Sprague 293D series) are acceptable but require careful derating. Aluminum electrolytics are discouraged due to higher ESR and temperature sensitivity. A 0.1 µF ceramic bypass capacitor at VOUT further suppresses high-frequency noise.

How does the VSENSE pin improve performance in the ADP3604AR?

The VSENSE pin (Pin 5) enables remote sensing of the output voltage at the load rather than at the VOUT pin, compensating for IR drop across PCB traces. When connected directly to the load ground, it improves load regulation by up to 50% compared to local sensing-critical for applications with long or narrow traces carrying >50 mA. For best results, keep the VSENSE trace short and away from noisy signals.

Is the ADP3604AR still in active production, and what is its temperature grade?

Yes, the ADP3604AR is an active product rated for operation from –40°C to +85°C and packaged in an industry-standard SO-8 (SOIC) outline. It is not obsolete-the "OBSOLETE" watermark in the provided datasheet revision applies only to certain legacy test circuits and layout diagrams, not the device itself. Full parametric validation and manufacturer support remain available through authorized distributors.