Analog Devices Inc./Maxim Integrated MAX884CSA+T

Overview

MAX884CSA+T from Maxim Integrated is a 3.3V fixed-output, low-dropout linear regulator with p-channel MOSFET pass transistor, delivering up to 200mA output current at ≤11.5V input, 220mV dropout (at 3.3V/200mA), 11µA typical quiescent current, and shutdown mode drawing <1µA - designed for battery-powered portable instruments and solar-powered devices.

For engineers reviewing the MAX884CSA+T datasheet, MAX884CSA+T pinout, MAX884CSA+T application, or MAX884CSA+T equivalent, key selection criteria include its 3.3V fixed/Dual Mode adjustable capability (1.25V–11V), reverse-current protection threshold of 6mV, thermal shutdown at +160°C, and SOIC-8 package with dual GND pins for enhanced thermal dissipation.

Technical Context

The MAX884CSA+T employs a 1.20V internal reference and error amplifier driving a p-channel MOSFET pass device, eliminating base-current losses inherent in bipolar regulators. Its Dual Mode comparator selects between internal fixed feedback (SET = GND → 3.3V) or external resistor-divider feedback (SET floating → adjustable 1.25V–11V) based on SET pin voltage (<65mV for fixed mode).

Shutdown is controlled by an active-low OFF pin that disables all circuitry including reference and bias networks, reducing supply current below 1µA. Reverse-current protection activates when VIN falls 6mV below VOUT, switching substrate connections to block backflow while maintaining LBI/LBO functionality until shutdown.

Key Specifications

Pinout & Package

The MAX884CSA+T is housed in an 8-pin SOIC package rated for 1.5W power dissipation (θ_JB = 53°C/W), with Pins 3 and 6 serving as dual GND terminals for electrical grounding and thermal conduction to PCB copper planes.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-dropout, low-IQ linear regulator applications.

Compared with TPS76333DBVR and MCP1702T-3302E/MB, the MAX884CSA+T uniquely combines 200mA output, sub-350mV dropout, <1µA shutdown, reverse-current blocking, and integrated low-battery detection - making it optimal for compact, feature-rich battery systems requiring robustness and long runtime.

Availability

MAX884CSA+T is available at Aetrix Electronics and suitable for portable medical sensors, solar-powered data loggers, industrial handheld scanners, and low-power IoT edge nodes requiring stable component supply across extended temperature ranges and lifecycle continuity.

Supply support for MAX884CSA+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for demanding industrial, automotive, and communications applications.

The MAX882/MAX883/MAX884 family was engineered specifically for micropower battery-operated systems needing ultra-low quiescent current, low dropout, and integrated protection - targeting pagers, cellular handsets, and portable instrumentation before modern PMICs existed.

FAQ

What output voltage does the MAX884CSA+T deliver in default configuration?

The MAX884CSA+T delivers a factory-trimmed fixed 3.3V output when the SET pin is connected to GND. This is verified across -40°C to +85°C with ±3.5% tolerance. The device also supports adjustable operation from 1.25V to 11V via external resistors on the SET pin, enabled when SET voltage exceeds 65mV.

How does the MAX884CSA+T achieve such low quiescent current across load conditions?

The MAX884CSA+T achieves 11µA typical quiescent current by using a p-channel MOSFET pass transistor that draws no gate drive current - unlike PNP-based regulators whose base current increases with load. This architecture eliminates load-dependent quiescent current rise, maintaining ultra-low IQ from no-load to full 200mA output.

What happens to the LBO pin during shutdown mode of the MAX884CSA+T?

During OFF-mode shutdown, the LBO pin of the MAX884CSA+T becomes undefined - it is not actively driven and should not be relied upon for low-battery signaling. This differs from the MAX882's STBY mode, where LBO remains functional. For battery monitoring during shutdown, external circuitry or wake-up sequencing must be used.

Can the MAX884CSA+T safely operate with input voltage lower than its output voltage?

Yes - the MAX884CSA+T includes reverse-current protection that activates when VIN falls 6mV below VOUT (typical), turning off the pass transistor to block backflow. This prevents battery or storage capacitor discharge through the regulator when input collapses, a critical feature in solar-harvesting and backup-power systems.

What thermal design considerations apply to the MAX884CSA+T in SOIC-8 package?

The MAX884CSA+T's SOIC-8 package has θ_JB = 53°C/W and requires both GND pins (3 and 6) to be soldered to a large copper pad or plane for effective heat conduction. Without adequate copper area, junction temperature may exceed +125°C even at moderate loads - derating curves in Figure 4 of the datasheet must be followed for reliable operation.