Analog Devices Inc./Maxim Integrated MAX1697SEUT#G16

Overview

The MAX1697SEUT#G16 from Maxim Integrated is a monolithic CMOS inverting charge-pump DC-DC converter in a 6-pin SOT23 package, designed to generate a regulated negative output voltage (–VIN) from a +1.25V to +5.5V input. It delivers up to 60mA output current with 12Ω typical output resistance, operates at 250kHz switching frequency, and features logic-controlled shutdown with 2nA quiescent current. It is used in portable analog circuitry requiring compact, low-noise negative bias from single-supply logic rails.

For engineers reviewing the MAX1697SEUT#G16 datasheet, MAX1697SEUT#G16 pinout, MAX1697SEUT#G16 application, or MAX1697SEUT#G16 equivalent, key selection criteria include its 250kHz oscillator frequency, 60mA load capability, ultra-low shutdown current, SOT23 footprint compatibility, and inverting topology for analog rail generation without inductors.

Technical Context

The MAX1697SEUT#G16 implements a two-phase switched-capacitor inverter using four on-chip MOSFET switches and internal oscillator control. Its 250kHz fixed-frequency operation minimizes external capacitor size while maintaining low output impedance under load.

It employs slew-rate-limited switching to reduce EMI, includes thermal shutdown at +150°C with 15°C hysteresis, and actively pulls OUT to GND via a 3Ω internal switch during shutdown-ensuring safe discharge of downstream capacitance.

Key Specifications

Pinout & Package

Package: 6-pin SOT23 (U6F-6 outline), 2.9mm × 1.6mm body, 0.95mm height, gull-wing leads.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar inverting charge-pump applications.

Compared with MAX1697SEUT#G16, the MAX1697TEUT#G16 trades higher output impedance and larger capacitors for reduced EMI, while the MAX1720EUT#TG16 sacrifices output current for lower static power-making each suitable for distinct load and noise requirements within the same SOT23 footprint.

Availability

MAX1697SEUT#G16 is available at Aetrix Electronics and suitable for battery-operated equipment, small LCD panels, and GaAsFET bias supplies requiring stable component supply across production lifecycles.

Supply support for MAX1697SEUT#G16 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, automotive, and communications markets.

The MAX1697SEUT#G16 belongs to Maxim's ultra-small charge-pump family, engineered for space-constrained portable electronics needing efficient, inductorless negative voltage generation from single-ended supplies.

FAQ

What is the switching frequency of the MAX1697SEUT#G16?

The MAX1697SEUT#G16 operates at a fixed 250kHz switching frequency. This high frequency allows the use of small 1µF ceramic capacitors for both the flying capacitor (C1) and output reservoir capacitor (C2), minimizing PCB area and cost. The frequency is factory-trimmed and not user-adjustable; it remains stable across temperature and input voltage variations per the datasheet's TOC16 plot.

Does the MAX1697SEUT#G16 require external components to function?

Yes, the MAX1697SEUT#G16 requires two external 1µF ceramic capacitors: C1 (flying capacitor) between C1+ and C1− pins, and C2 (output capacitor) between OUT and GND. An optional 1µF input bypass capacitor (C3) between IN and GND is recommended to suppress switching noise on the input rail. No inductors or diodes are needed-enabling fully capacitor-based negative voltage generation.

How does the shutdown feature work on the MAX1697SEUT#G16?

Driving the SHDN pin low (<0.6V) places the MAX1697SEUT#G16 into shutdown mode, halting the internal oscillator and reducing supply current to 2nA (typ). Crucially, the OUT pin is actively pulled to GND through an internal 3Ω switch, ensuring rapid discharge of downstream capacitance and preventing floating outputs. Driving SHDN high (>2.1V) restores normal operation with startup time dependent on capacitor values and load.

What is the maximum output current capability of the MAX1697SEUT#G16?

The MAX1697SEUT#G16 delivers up to 60mA continuous output current into a resistive load. This is verified across the full operating temperature range (–40°C to +85°C) and input voltage range (+1.25V to +5.5V). At 60mA, the output voltage deviates from ideal –VIN by approximately 0.72V due to its 12Ω typical output resistance-designers must account for this droop in system-level voltage margining.

Can the MAX1697SEUT#G16 be used to generate voltages other than –VIN?

No-the MAX1697SEUT#G16 is a fixed-ratio inverter and only produces –VIN (e.g., –3.3V from +3.3V input). It cannot generate –1.5×VIN, –2×VIN, or adjustable outputs. For cascaded or doubled outputs, external configurations (e.g., two MAX1697s in series per Figure 4) are required-but those implementations increase complexity, reduce efficiency, and are not supported by the MAX1697SEUT#G16's internal architecture alone.