Analog Devices Inc./Maxim Integrated MAX660CSA-T

Overview

MAX660CSA-T from Maxim Integrated is a CMOS monolithic charge-pump voltage converter IC that inverts +1.5V to +5.5V input to -1.5V to -5.5V output or doubles input to +3.0V to +11.0V, delivers 100mA output current, features selectable 10kHz/80kHz oscillator frequency via FC pin, and achieves >90% efficiency at typical loads-used in handheld instrument power rails and op-amp dual-supply generation.

For engineers reviewing the MAX660CSA-T datasheet, MAX660CSA-T pinout, MAX660CSA-T application, or MAX660CSA-T equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternatives for voltage inverter/doubler roles, and supply-chain support details specific to the SO-8 packaged MAX660CSA-T variant.

Technical Context

The MAX660CSA-T implements a two-phase switched-capacitor charge-pump topology with internal MOSFET switches, supporting both inverting and voltage-doubling modes. Its LV pin selects low-voltage operation (required below 3V input), and FC pin configures oscillator frequency without external components.

Oscillator frequency directly controls ripple magnitude and capacitor sizing: 10kHz mode minimizes quiescent current (120µA typ), while 80kHz mode reduces required C1/C2 values and output impedance drift across temperature. Output source resistance is guaranteed <15Ω with 10µF capacitors and exhibits <6.5Ω typical value at 100mA load.

Key Specifications

Pinout & Package

MAX660CSA-T is housed in an 8-pin small-outline integrated circuit (SOIC-8) package, 3.9mm × 4.9mm body size, 1.27mm lead pitch, with gull-wing leads and JEDEC MS-012AC compliance. Thermal resistance θ_JA is 170°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX860CSA-T and ICL7660SAZ, the MAX660CSA-T uniquely balances 100mA drive capability, selectable frequency, and sub-3V compatibility-making it the only option among the three that supports both high-current portable instrumentation and single-cell alkaline operation without performance compromise.

Availability

MAX660CSA-T is available at Aetrix Electronics and suitable for laptop peripheral power, medical sensor bias supply, RS-232 transceiver interface, and operational amplifier dual supply applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for MAX660CSA-T 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

Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power-management ICs for industrial, medical, and communications systems, with emphasis on high-reliability, low-power, and integration-optimized solutions.

The MAX660CSA-T belongs to Maxim's switched-capacitor voltage converter product line, engineered specifically for inductorless DC/DC conversion in space-constrained, EMI-sensitive, and battery-operated applications where efficiency and simplicity are critical.

FAQ

What is the absolute maximum input voltage rating for the MAX660CSA-T?

The MAX660CSA-T has an absolute maximum supply voltage rating of +6V between V+ and GND or between GND and OUT. Exceeding this voltage-even momentarily-may cause permanent damage. The recommended operating range remains +1.5V to +5.5V, and all electrical characteristics are specified within this window. Always observe derating guidelines when operating near absolute maxima.

Can the MAX660CSA-T generate both positive and negative outputs simultaneously from one input?

Yes-the MAX660CSA-T can be configured in cascaded or combined topologies to generate simultaneous positive and negative rails. Figure 5 in the official datasheet shows a dual-function circuit using one MAX660CSA-T to produce both +2×V_IN and -V_IN, though output impedances increase due to shared charge-pump driver. For optimal performance, separate MAX660CSA-T units are recommended per rail.

Does the MAX660CSA-T require external diodes or inductors in standard inverter mode?

No-the MAX660CSA-T integrates all necessary MOSFET switches and control logic internally. In standard inverter mode, only two external capacitors (C1 and C2) are required: a 1µF–150µF pump capacitor between CAP+ and CAP-, and a 1µF–150µF reservoir capacitor between OUT and GND. No diodes, inductors, or additional active components are needed.

How does the LV pin affect MAX660CSA-T operation below 3V input?

When input voltage falls below 3V, the LV pin must be tied to GND to bypass internal regulator circuitry and maintain stable inverter operation. Leaving LV open or floating below 3V causes unpredictable oscillation and degraded output regulation. Above 3V, LV may be left open or grounded-grounding simplifies ICL7660 drop-in replacement.

What capacitor types are recommended for MAX660CSA-T to achieve guaranteed <15Ω output impedance?

To guarantee ROUT <15Ω, use aluminum electrolytic or OS-CON capacitors with ≤0.5Ω ESR and ≥10µF capacitance for both C1 and C2. Low-ESR tantalum (e.g., AVX TPS series) or ceramic (TDK, United Chemi-Con) are acceptable if ESR ≤0.25Ω. Avoid standard ceramic capacitors above 10µF due to DC bias derating and insufficient ESR for optimal charge transfer.