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-noise, inductorless voltage boosting in space-constrained battery-powered systems. It delivers up to 50mA output current from a 2V–3.6V input (e.g., two alkaline or NiMH cells), features 500kHz internal oscillation, 150µA max no-load supply current, and logic-controlled shutdown with 1µA max quiescent draw. It serves as a compact 5V supply for microprocessor peripherals and flash memory programming.

For engineers reviewing the MAX619CSA+ datasheet, MAX619CSA+ pinout, MAX619CSA+ application, or MAX619CSA+ equivalent, key selection criteria include guaranteed output current over temperature (20mA at VIN ≥2V, 50mA at VIN ≥3V), absence of inductors, ultra-small PCB footprint (<0.1in²), shutdown-induced load disconnection, and SO-8 package compatibility with standard reflow processes.

Technical Context

The MAX619CSA+ employs a pulse-skipping control architecture to regulate output voltage, dynamically switching between voltage-doubling (VIN = 3.0–3.6V) and voltage-tripling (VIN = 2.0–2.5V) modes - with 2.5× multiplication in the 2.5–3.0V transition band - to maximize efficiency across its full input range. Its internal comparator selects the higher of VIN or VOUT to power internal circuitry, improving light-load regulation.

It uses only four external capacitors: two 0.22µF flying caps (C1, C2) and two 10µF bulk caps (C3, C4). The device lacks short-circuit protection and requires careful capacitor selection to limit peak currents and ripple; ceramic or tantalum types are recommended for C1/C2 to maintain stability and transient response.

Key Specifications

Pinout & Package

The MAX619CSA+ is housed in an 8-pin SO (Small Outline) package, 3.9mm × 4.9mm body size, 1.27mm pitch, RoHS-compliant, and suitable for automated surface-mount assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS60403DBVR and LM2703MMX/NOPB, the MAX619CSA+ offers tighter output tolerance (±4% vs. ±5%), superior low-VIN regulation stability (guaranteed down to 2.0V), and smallest total solution size - making it optimal for cost-sensitive, space-constrained dual-cell battery applications where fixed 5V is sufficient.

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, long-lifecycle availability, and consistent SO-8 packaging.

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, communications, and consumer applications.

The MAX619CSA+ belongs to Maxim's charge-pump DC-DC converter product line, engineered specifically for ultra-compact, low-EMI, battery-powered systems needing fixed 5V rails without inductors - targeting handheld test equipment, medical sensors, and portable data acquisition.

FAQ

What is the guaranteed output current of the MAX619CSA+ across its input voltage range?

The MAX619CSA+ guarantees 20mA output current when VIN ≥2V and 50mA when VIN ≥3V, tested over the full 0°C to +70°C operating temperature range. This specification ensures reliable operation across the discharge curve of two alkaline or NiMH cells, where voltage drops from ~3.2V fresh to ~2.0V end-of-life. The MAX619CSA+ maintains regulation within ±4% under these conditions without requiring external current limiting.

Does the MAX619CSA+ require inductors in its application circuit?

No, the MAX619CSA+ uses a capacitor-based charge-pump topology and requires no inductors. Its complete application circuit consists of only four external capacitors: two 0.22µF flying capacitors (C1, C2) and two 10µF input/output bulk capacitors (C3, C4). This eliminates magnetic components, reduces EMI, and enables ultra-compact layouts - a defining feature of the MAX619CSA+ versus inductive DC-DC converters.

How does shutdown functionality work on the MAX619CSA+?

The MAX619CSA+ enters shutdown when the SHDN pin is driven logic-high (≥0.7×VIN). In this state, internal switching halts, the output is actively disconnected from the input, and supply current drops to ≤1µA. The output voltage falls to 0V, preventing backfeed. To resume operation, SHDN must be pulled low (≤0.4V); the MAX619CSA+ typically reaches regulated 5V output within 0.5ms under no-load conditions after SHDN assertion.

What package type and dimensions does the MAX619CSA+ use?

The MAX619CSA+ is supplied in an 8-pin SO (Small Outline) package measuring 3.9mm × 4.9mm with 1.27mm lead pitch. It conforms to JEDEC MS-012 standards and is RoHS-compliant. This package supports standard reflow soldering and is pin-compatible with other SO-8 DC-DC converters, simplifying layout reuse and manufacturing scalability for the MAX619CSA+.

Can multiple MAX619CSA+ devices be paralleled to increase output current?

Yes, two MAX619CSA+ units can be paralleled to increase output drive capability. The IN, OUT, and GND pins may be directly connected, but C1+ / C1− and C2+ / C2− pins must remain independent. Input and output bulk capacitors (C3, C4) can be shared if devices are placed in close proximity - using doubled capacitance values - though separate capacitors are recommended for best transient performance and ripple suppression in the MAX619CSA+ parallel configuration.