Analog Devices Inc. ADM660AN

Overview

ADM660AN from Analog Devices is a CMOS switched-capacitor voltage converter configured for inverting (V_OUT = –V_IN) or doubling (V_OUT = 2×V_IN) operation, delivering up to 100 mA output current with 0.3 V dropout at 30 mA load, +1.5 V to +7 V input range, and selectable 25 kHz/120 kHz charge-pump frequency - used in op amp dual-rail power supplies and portable instrumentation.

For engineers reviewing the ADM660AN datasheet, ADM660AN pinout, ADM660AN application, or ADM660AN equivalent, key selection criteria include its dual-mode voltage conversion capability, low 600 µA quiescent current, pin compatibility with MAX660/ICL7660, 8-lead PDIP package, and absence of shutdown functionality compared to ADM8660.

Technical Context

The ADM660AN implements a two-phase switched-capacitor topology using internal MOSFET switches controlled by an on-chip oscillator whose frequency is set via FC pin (25 kHz open, 120 kHz tied to V+) or externally via OSC pin. It supports both inverting and doubling configurations through reconfiguration of LV and external capacitor connections.

In inverting mode, GND serves as positive input and OUT delivers negative voltage; in doubling mode, GND becomes input reference and V+ becomes doubled output. The device requires only two external low-ESR electrolytic capacitors (10 µF at 25 kHz or 2.2 µF at 120 kHz) and achieves >90% efficiency at 50 mA load.

Key Specifications

Pinout & Package

ADM660AN is supplied in an 8-lead plastic dual-in-line package (PDIP, N-8), 0.3-inch body width, through-hole mountable with 0.1-inch lead pitch. Pin 1 is marked by a notch or dot; leads are tin-lead plated per JEDEC MS-001.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX660CPA+ and ICL7660CPEZ, ADM660AN provides superior efficiency (90–94% vs. ~85%), dual-mode operation, and flexible frequency control - making it optimal for new designs requiring extended battery life, compact capacitor sizing, or configurable rail generation.

Availability

ADM660AN is available at Aetrix Electronics and suitable for handheld instrumentation, op amp power supplies, and remote data acquisition systems requiring stable component supply and long-term industrial temperature support.

Supply support for ADM660AN 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, headquartered in Norwood, MA.

The ADM660AN belongs to Analog Devices' switched-capacitor voltage converter product line, designed specifically to replace inductor-based solutions in space-constrained, low-EMI, and battery-powered analog systems.

FAQ

What voltage conversion modes does the ADM660AN support?

The ADM660AN supports two distinct voltage conversion modes: inversion (V_OUT = –V_IN) and doubling (V_OUT = 2×V_IN). Inversion is enabled by connecting LV to GND and using standard inverter configuration; doubling requires connecting LV to OUT and reassigning GND as input and V+ as output. The ADM660AN datasheet confirms both modes are fully specified and characterized across the full –40°C to +85°C range.

Does the ADM660AN include a shutdown feature?

No, the ADM660AN does not include a shutdown feature. Shutdown functionality is exclusive to the ADM8660 variant, which uses the SD pin for disabling the charge pump and reducing quiescent current to 0.3 µA. The ADM660AN pinout contains OSC instead of SD, and its specifications list only active-mode supply current (0.6 mA typical). This distinction is clearly documented in the ADM660/ADM8660 datasheet's "Options" table and pin function descriptions.

What external capacitors are required for the ADM660AN?

The ADM660AN requires two external low-ESR electrolytic capacitors: C1 (charge-transfer) and C2 (output filter), both rated ≤0.2 Ω ESR. At 25 kHz (FC open), 10 µF capacitors are recommended; at 120 kHz (FC = V+), 2.2 µF capacitors may be used. The ADM660AN datasheet specifies these values in Tables I and III and emphasizes that high-ESR capacitors degrade efficiency, output resistance, and ripple performance.

Is the ADM660AN pin-compatible with the ICL7660?

Yes, the ADM660AN is pin-compatible with the ICL7660 in its 8-lead PDIP (N-8) package. Both devices share identical pin assignments for FC, OUT, LV, GND, V+, CAP+, CAP–, and OSC (though ICL7660 lacks OSC functionality). The ADM660AN datasheet explicitly states it is a "pin compatible upgrade" and notes LV can be left open to facilitate direct substitution. Electrical differences - including higher output current and selectable frequency - do not affect mechanical or routing compatibility.

What is the maximum output current specification for the ADM660AN?

The ADM660AN is rated for 100 mA continuous output current, as confirmed in the "FEATURES" section and "SPECIFICATIONS" table of its datasheet. This rating applies to both inverting and doubling configurations under conditions of V_IN ≥ 2.5 V (doubling) or ≥ 1.5 V (inverting), with corresponding efficiency ≥80% at 100 mA load. Thermal limits (500 mW power dissipation in RU-16, derated above +50°C) constrain sustained 100 mA operation in high-ambient environments.