Analog Devices Inc. ADM8660AN

Overview

ADM8660AN from Analog Devices is a CMOS switched-capacitor voltage inverter IC that generates a regulated negative output (–V_IN) from a +1.5 V to +7 V input supply, delivering up to 100 mA output current with 90% efficiency at 1 kW load, and featuring a dedicated shutdown (SD) pin for <300 nA quiescent current in disabled state - used in portable op amp power supplies and handheld instrumentation.

For engineers reviewing the ADM8660AN datasheet, ADM8660AN pinout, ADM8660AN application, or ADM8660AN equivalent, key selection considerations include its fixed inverting-only function (no doubling), 25 kHz/120 kHz selectable charge-pump frequency, low-ESR capacitor requirements (2.2 µF or 10 µF), –40°C to +85°C industrial temperature range, and TSSOP-compatible 8-lead SOIC package (R-8).

Technical Context

The ADM8660AN implements a two-phase switched-capacitor topology using internal MOSFET switches controlled by an on-chip oscillator, where charge transfer between external C1 and C2 capacitors enables precise voltage inversion without inductors. Its FC pin selects between 25 kHz (GND) and 120 kHz (V+) operation, directly impacting output impedance and capacitor sizing.

Unlike the ADM660, the ADM8660AN replaces the OSC pin with SD - a logic-controlled shutdown input that disables the oscillator and reduces supply current to ≤5 µA, with 500 µs exit time. LV pin configures low-voltage operation (<3.5 V), and output resistance remains stable at 9–15 Ω across 100 mA load at +25°C.

Key Specifications

Pinout & Package

ADM8660AN is packaged in an 8-lead narrow-body SOIC (R-8), 3.9 mm × 4.9 mm body, 1.27 mm lead pitch, compliant with JEDEC MS-012-AA.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX660CPA+ and ICL7660CBAZ, the ADM8660AN offers superior shutdown control and selectable frequency for optimized capacitor sizing - making it the preferred choice for modern portable instrumentation where power efficiency and design flexibility are critical.

Availability

ADM8660AN is available at Aetrix Electronics and suitable for handheld test equipment, portable data acquisition systems, and op amp power supplies requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for ADM8660AN 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 since 1965.

The ADM8660AN belongs to Analog Devices' switched-capacitor voltage converter product line, engineered specifically for compact, inductorless negative rail generation in space-constrained portable and battery-operated systems.

FAQ

What is the maximum output current specification for the ADM8660AN?

The ADM8660AN delivers up to 100 mA continuous output current into a resistive load while maintaining ≥80% power efficiency. At this load, output resistance is specified at 9–15 Ω at +25°C, rising to 16.5 Ω over the full –40°C to +85°C operating range. The device sustains this performance with input voltages from +1.5 V to +7 V and supports both 25 kHz and 120 kHz charge-pump frequencies depending on FC pin configuration.

Does the ADM8660AN support voltage doubling functionality?

No, the ADM8660AN does not support voltage doubling. It is strictly a voltage inverter, generating –V_IN from a positive input supply. Doubling capability is exclusive to the ADM660 variant. The ADM8660AN replaces the OSC pin found on the ADM660 with an SD (shutdown) pin, confirming its dedicated inverter-with-shutdown role. This functional distinction is explicitly documented in the "ADM660/ADM8660 Options" table and General Description section of the datasheet.

What package type is used for the ADM8660AN part number?

ADM8660AN uses the 8-lead narrow-body SOIC package (R-8), measuring 3.9 mm × 4.9 mm with 1.27 mm lead pitch and JEDEC MS-012-AA compliance. The "AN" suffix in the ordering code (e.g., ADM8660ANZ) denotes the RoHS-compliant PDIP variant, but the "ADM8660AN" base part as referenced in the datasheet's main specifications and pin diagrams corresponds to the R-8 SOIC option unless otherwise qualified with "NZ" or "RUZ". Pinout and thermal specs align with R-8 mechanical data.

How does the shutdown (SD) pin operate on the ADM8660AN?

The SD pin on the ADM8660AN is an active-high shutdown control: applying V_IN (≥2.4 V) disables the internal oscillator and reduces quiescent current to ≤5 µA, while pulling SD to GND (≤0.8 V) enables normal operation. Exit from shutdown takes approximately 500 µs for the output to stabilize at full load. When unused, SD must be hardwired to GND to ensure reliable startup - unlike the ADM660, the ADM8660AN has no OSC pin, so SD is the sole control interface beyond FC and LV.

Which external capacitors are recommended for the ADM8660AN?

For the ADM8660AN, two low-ESR electrolytic capacitors (C1 and C2) are required: 10 µF when FC = GND (25 kHz operation) or 2.2 µF when FC = V+ (120 kHz operation). Both must have ESR < 0.2 Ω to maintain specified output resistance and ripple. The datasheet validates performance using 10 µF/low-ESR parts, and recommends matching C1 and C2 values. Ceramic capacitors are not advised due to insufficient capacitance retention under bias and voltage coefficient effects.