Analog Devices Inc./Maxim Integrated MAX619CSA

Overview

The MAX619CSA from Maxim Integrated is a regulated 5V ±4% charge-pump DC-DC converter designed for low-voltage battery-powered systems. It accepts 2V–3.6V input (e.g., two alkaline or NiMH cells), delivers up to 50mA output current at 5V, operates with 500kHz internal oscillator, and features logic-controlled shutdown with ≤1µA supply current. It is used in portable instruments and 3V-to-5V local conversion where inductor-free, ultra-small footprint solutions are required.

For engineers reviewing the MAX619CSA datasheet, MAX619CSA pinout, MAX619CSA application, or MAX619CSA equivalent, key selection criteria include guaranteed 50mA output at VIN ≥3V, ±4% output regulation over temperature, 8-pin SO package compatibility, shutdown-induced load disconnection, and absence of inductors for EMI-sensitive designs.

Technical Context

The MAX619CSA employs a pulse-skipping controller to regulate output voltage by dynamically switching between voltage-doubler mode (VIN = 3.0–3.6V), voltage-tripler mode (VIN = 2.0–2.5V), and 2.5× mode (VIN = 2.5–3.0V). Its internal comparator selects the higher of VIN or VOUT to power internal circuitry, improving efficiency across the input range.

It uses only four external capacitors - two 0.22µF flying caps (C1, C2) and two 10µF bulk caps (C3, C4) - enabling full operation in <0.1in² board area. Shutdown disconnects OUT from IN, eliminating reverse current path and ensuring true load isolation.

Key Specifications

Pinout & Package

The MAX619CSA is housed in an 8-pin SO (Small Outline) package, 150 mil width, with gull-wing leads and standard JEDEC MS-012AC outline.

Key Features

Applications

Equivalent & Alternatives

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

Compared with the MAX619CSA, the TPS60110IDR offers higher current but sacrifices low-VIN efficiency and adds layout complexity, while the LM2767MM/NOPB simplifies capacitor count at the expense of dynamic efficiency optimization and tighter regulation.

Availability

MAX619CSA is available at Aetrix Electronics and suitable for portable instruments & handy-terminals, battery-powered microprocessor-based systems, and 5V flash memory programmers requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for MAX619CSA 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, communications, and consumer applications.

The MAX619 belongs to Maxim's precision charge-pump DC-DC converter product line, engineered specifically for ultra-low-power, inductorless voltage boosting in space- and battery-constrained portable electronics.

FAQ

What is the guaranteed output current capability of the MAX619CSA across its operating temperature range?

The MAX619CSA guarantees 50mA output current when VIN ≥3.0V and ambient temperature is within 0°C to +70°C. At lower input voltages (VIN ≥2.0V), it guarantees 20mA over the same temperature range. These values are specified in the Electrical Characteristics table and validated across process corners and temperature extremes - not typical-only ratings. The MAX619CSA maintains regulation within ±4% under these load conditions.

Does the MAX619CSA require external feedback resistors to set the output voltage?

No, the MAX619CSA does not require external feedback resistors. It integrates a precision bandgap reference and internal feedback network to deliver a fixed 5.0V ±4% output. This eliminates resistor placement, trimming, and drift concerns - critical for compact, low-cost, and high-reliability portable designs. The MAX619CSA's regulation is factory-trimmed and verified across temperature and supply variations.

Can the MAX619CSA be used with lithium coin cell batteries such as CR2032?

Yes, the MAX619CSA is explicitly rated for input voltages down to 2.0V, matching the nominal 3.0V and end-of-life ~2.0V discharge curve of CR2032 cells. Its low 150µA max operating current and 1µA shutdown current make it ideal for long-life coin-cell applications like real-time clocks or memory backup. The MAX619CSA maintains regulation even as the cell voltage declines, unlike many boost converters that drop out below 2.2V.

How does the MAX619CSA handle short-circuit conditions on its output?

The MAX619CSA is not short-circuit protected, as explicitly stated in Note 1 of the Absolute Maximum Ratings section. Under sustained short-circuit, output current is limited only by internal switch resistance and capacitor ESR, potentially exceeding safe junction temperature. External current limiting (e.g., series resistor or polyfuse) is recommended if fault tolerance is required. The MAX619CSA should be used in applications where output shorts are either physically prevented or managed upstream.

What is the purpose of the C1+ and C1− pins on the MAX619CSA, and how do they differ from C2+ and C2−?

The C1+ and C1− pins connect to the first flying capacitor (C1), while C2+ and C2− connect to the second (C2). In tripler mode, both capacitors charge in parallel from VIN, then stack in series to generate ~3×VIN. In doubler mode, only C2 is actively used; C1 remains idle. The MAX619CSA's internal switch matrix reconfigures these nodes dynamically - C1+ and C1− are never left floating, and their connection topology is integral to achieving 2.5× and tripler operation.