Analog Devices Inc. ADM660ARU

Overview

ADM660ARU from Analog Devices is a CMOS switched-capacitor voltage converter that inverts (+1.5 V to +7 V input → –1.5 V to –7 V output) or doubles (+2.5 V to +7 V input → +5 V to +14 V output) supply rails. It delivers up to 100 mA output current with ≤0.3 V dropout at 30 mA, 600 µA quiescent current, and selectable 25 kHz/120 kHz charge-pump frequency. It serves as a compact negative/positive rail generator in op amp power supplies and portable instrumentation.

For engineers reviewing the ADM660ARU datasheet, ADM660ARU pinout, ADM660ARU application, or ADM660ARU equivalent, key selection criteria include inverting/doubling mode support, TSSOP-16 package compatibility, low-ESR capacitor requirements (2.2 µF or 10 µF), LV pin configuration for low-voltage operation, and absence of shutdown functionality compared to ADM8660.

Technical Context

The ADM660ARU implements a two-phase switched-capacitor topology using internal MOSFET switches controlled by an on-chip oscillator. Its dual-mode operation-voltage inversion (V_OUT = –V_IN) and voltage doubling (V_OUT = 2×V_IN)-is selected via external pin connections (LV tied to OUT for doubling, GND for inversion). The FC pin selects internal oscillator frequency (25 kHz or 120 kHz), directly impacting external capacitor sizing and output impedance.

Unlike the ADM8660, the ADM660ARU includes an OSC pin for external clock injection or capacitor-controlled frequency tuning, enabling precise oscillator control beyond the two fixed frequencies. It lacks a shutdown (SD) pin, confirming its role as a continuously operating charge pump optimized for stable rail generation rather than power-gated applications.

Key Specifications

Pinout & Package

ADM660ARU is housed in a 16-lead Thin Shrink Small Outline Package (TSSOP, RU-16), measuring 5.00 mm × 4.40 mm × 1.20 mm, with 0.65 mm lead pitch and JEDEC MO-153-AB compliance. Pin 1 is marked by a dot; pins are numbered counterclockwise.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX660CPA+ and ICL7660CBAZ, the ADM660ARU provides superior flexibility via OSC/FC control, higher output current, lower quiescent current, and modern TSSOP-16 packaging-making it the preferred choice for new designs requiring scalability, efficiency, and layout density.

Availability

ADM660ARU is available at Aetrix Electronics and suitable for handheld instruments, portable computers, and remote data acquisition systems requiring stable component supply, long-term industrial temperature support, and RoHS-compliant packaging.

Supply support for ADM660ARU 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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, and communications markets.

The ADM660ARU belongs to Analog Devices' switched-capacitor voltage converter product line, designed specifically to replace inductive DC/DC converters in space-constrained, low-noise analog systems requiring clean, compact dual-rail or boosted supplies.

FAQ

What is the maximum output current supported by the ADM660ARU?

The ADM660ARU supports up to 100 mA of continuous output current in both inverting and doubling configurations. At this load, it maintains >80% power efficiency and exhibits 9–15 Ω output resistance. Performance is validated with low-ESR capacitors (≤0.2 Ω) and within the –40°C to +85°C operating range. Exceeding 100 mA risks thermal overload due to its 500 mW RU-16 power dissipation limit.

Can the ADM660ARU be used to generate a positive doubled output voltage?

Yes, the ADM660ARU can generate a positive doubled output (V_OUT = 2×V_IN) when configured in voltage doubler mode: connect LV to OUT, apply input to GND, and use V+ as the output. Input range is +2.5 V to +7 V, yielding +5 V to +14 V outputs. This mode requires no additional components beyond C1 and C2, and is exclusive to the ADM660ARU-not supported by ADM8660.

Does the ADM660ARU include a shutdown function?

No, the ADM660ARU does not include a shutdown (SD) function. That feature is exclusive to the ADM8660 variant. The ADM660ARU has no SD pin; instead, it features an OSC pin for external clock or capacitor-based frequency control. To disable the ADM660ARU, system-level power gating of V+ is required.

What capacitor values are recommended for the ADM660ARU?

For 25 kHz operation (FC = open), 10 µF low-ESR electrolytic capacitors are recommended for C1 and C2. For 120 kHz operation (FC = V+), 2.2 µF low-ESR capacitors are optimal. Capacitors must have ESR < 0.2 Ω to maintain efficiency and low output impedance. Both C1 and C2 should match in value and type; ceramic capacitors are not recommended due to insufficient capacitance and voltage rating limitations.

Is the ADM660ARU pin-compatible with the ICL7660?

Yes, the ADM660ARU is pin-compatible with the ICL7660 in its 8-pin SOIC (R-8) and PDIP (N-8) variants-but not in the 16-pin TSSOP (RU-16) package. In RU-16, pins 1–4, 10–16 are NC, while functional pins (5–9, 12–14) map identically to the ICL7660's 8-pin layout. LV pin behavior (open = ICL7660-compatible mode) further enables direct substitution in existing designs.