Analog Devices Inc. ADM8828ARTZ-REEL7

Overview

ADM8828ARTZ-REEL7 from Analog Devices is a switched-capacitor voltage inverter IC that generates a regulated negative output from a +1.5 V to +5.5 V positive input, delivering up to 25 mA with 99.5% no-load voltage conversion efficiency and 20 nA shutdown current. It features a dedicated SHDN pin, requires only two 1 µF low-ESR capacitors, and operates in a 6-lead SOT-23 (RJ-6) package for space-constrained portable power rails.

For engineers reviewing the ADM8828ARTZ-REEL7 datasheet, ADM8828ARTZ-REEL7 pinout, ADM8828ARTZ-REEL7 application, or ADM8828ARTZ-REEL7 equivalent, key selection criteria include input voltage range compatibility, shutdown quiescent current, output resistance at load, charge-pump frequency stability over temperature, and SOT-23 footprint constraints in single-supply systems.

Technical Context

The ADM8828ARTZ-REEL7 implements a two-phase switched-capacitor inversion topology using an internal oscillator (50–190 kHz) and four MOSFET switches controlled by antiphase clock signals φ1 and φ2. Charge transfer occurs between flying capacitor C1 and output capacitor C2 to invert VIN to –VIN with minimal external components.

It integrates a logic-controlled shutdown function that disables the oscillator and switching network, reducing supply current to 20 nA while discharging OUT to GND. The device's output resistance (18 Ω typ. at 5 mA) and ripple performance (25 mV p-p at 5 mA) are directly dependent on external capacitor ESR and value, not internal regulation.

Key Specifications

Pinout & Package

ADM8828ARTZ-REEL7 is housed in a RoHS-compliant 6-lead SOT-23 package (JEDEC MO-178-AB, package option RJ-6), with 1.9 mm × 2.9 mm footprint and 0.95 mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX680ESA+ and TPS60403DBVR, the ADM8828ARTZ-REEL7 offers the lowest shutdown current (20 nA), optimal efficiency at light loads, and minimal external component count-making it preferred for ultra-low-power, space-constrained portable instrumentation.

Availability

ADM8828ARTZ-REEL7 is available at Aetrix Electronics and suitable for handheld instruments, LCD panels, and cellular phone power management requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for ADM8828ARTZ-REEL7 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.

The ADM8828ARTZ-REEL7 belongs to Analog Devices' switched-capacitor power management product line, designed specifically for compact, low-noise, battery-efficient negative rail generation in portable and space-constrained electronic systems.

FAQ

What is the maximum continuous output current supported by the ADM8828ARTZ-REEL7?

The ADM8828ARTZ-REEL7 delivers up to 25 mA of continuous output current under typical conditions (VIN = 5 V, C1 = C2 = 1 µF, TA = 25°C). At 25 mA load, output ripple rises to 130 mV p-p and voltage conversion efficiency drops to ~91%. For sustained 25 mA operation, ensure adequate PCB copper area for thermal dissipation and use low-ESR capacitors.

Does the ADM8828ARTZ-REEL7 require external resistors for feedback or regulation?

No, the ADM8828ARTZ-REEL7 is a fixed-ratio charge-pump inverter with no feedback loop or regulation circuitry. Its output voltage is approximately –VIN (e.g., –3.3 V from 3.3 V input), with accuracy dependent on input stability, load, and capacitor ESR. It does not support adjustable output or precision regulation-designs requiring tight tolerance should add post-regulation.

How does the shutdown function behave during exit, and what is the recovery time?

When the SHDN pin transitions from high (disabled) to low (enabled), the ADM8828ARTZ-REEL7 requires approximately 175 µs to stabilize its output voltage to final value under 5 mA load. During this period, OUT ramps from 0 V toward –VIN. This delay is due to oscillator startup and capacitor charging cycles-not a programmable soft-start feature.

Can the ADM8828ARTZ-REEL7 operate from a 1.8 V input supply?

Yes, the ADM8828ARTZ-REEL7 supports input voltages as low as +1.5 V. At VIN = 1.8 V, it delivers –1.8 V output with ~99% voltage conversion efficiency and 65 kHz charge-pump frequency. Output current capability decreases proportionally with input voltage; expect ~12 mA max at 1.8 V based on Figure 4 in the datasheet.

What capacitor types and values are recommended for optimal performance with the ADM8828ARTZ-REEL7?

Analog Devices specifies 1 µF low-ESR electrolytic capacitors (ESR < 0.2 Ω) for both C1 (flying) and C2 (output). Ceramic capacitors may be used if ESR is controlled, but standard X7R ceramics often exhibit higher effective ESR at 100 kHz. Increasing C1 lowers output resistance; increasing C2 reduces ripple. For best results, match C1 and C2 values and place them within 3 mm of the ADM8828ARTZ-REEL7 pins.