Analog Devices Inc./Maxim Integrated MAX1819EBL18

Overview

MAX1819EBL18 from Maxim Integrated is a 500mA low-dropout linear regulator with preset 1.8V output, ±1% initial accuracy, 125µA ground current, and 90mV dropout at full load-designed for power-sensitive portable systems including cellular phones, PDAs, and USB hubs.

For engineers reviewing the MAX1819EBL18 datasheet, MAX1819EBL18 pinout, MAX1819EBL18 application, or MAX1819EBL18 equivalent, this page delivers verified electrical parameters, UCSP package layout, thermal shutdown behavior, POK monitoring logic, and real-world load-transient performance under dropout conditions.

Technical Context

The MAX1819EBL18 integrates a P-channel MOSFET pass transistor (R_DS(ON) ≈ 0.25Ω) enabling ultra-low quiescent current independent of load, with Dual Mode™ feedback selection between factory-trimmed 1.8V output and adjustable mode via SET pin.

It features an open-drain POK output asserting low when V_OUT falls below 93% of nominal (1.674V), active-low SHDN with 0.1µA shutdown current, and thermal shutdown at +170°C with 20°C hysteresis-optimized for battery-powered systems requiring stable voltage under dynamic load and temperature extremes.

Key Specifications

Pinout & Package

Package: 6-pin UCSP (Ultra-Compact Silicon Package), 1.5mm × 1.5mm, 0.5mm pitch, bottom-soldered ball grid array (BGA-style). Thermal pad on underside enhances heatsinking in space-constrained PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS73118DBVR and MCP1825-1802E/DB, the MAX1819EBL18 delivers superior battery runtime via 90mV dropout and 125µA quiescent current, enables system-level power sequencing with integrated POK, and fits into ultra-dense layouts using its 1.5mm × 1.5mm UCSP package-making it optimal for next-generation portable electronics where size, efficiency, and intelligence are co-prioritized.

Availability

MAX1819EBL18 is available at Aetrix Electronics and suitable for cellular telephones, USB hubs, notebook computers, PDAs, and docking stations requiring stable component supply with guaranteed long-term availability and consistent parametric performance.

Supply support for MAX1819EBL18 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.

The MAX1819 belongs to Maxim's low-quiescent-current LDO family, engineered specifically for battery-powered portable electronics demanding extended runtime, compact packaging, and intelligent power supervision-including POK signaling and thermal resilience.

FAQ

What is the guaranteed dropout voltage of the MAX1819EBL18 at 500mA load?

The MAX1819EBL18 guarantees a maximum dropout voltage of 165mV at 500mA load for V_OUT = 2.5V, but its typical dropout is 90mV at 500mA for the 1.8V output version. This low dropout enables operation down to VIN = 1.89V while maintaining regulation-critical for maximizing Li-ion battery utilization in portable devices. The actual dropout varies with output voltage per Maxim's published equations.

Does the MAX1819EBL18 require external components for stable operation?

Yes-the MAX1819EBL18 requires a minimum 1µF ceramic capacitor between IN and GND, and a 3.3µF low-ESR (<0.1Ω) ceramic capacitor between OUT and GND. For output voltages below 2V, Maxim specifies a 4.7µF output capacitor. These capacitors ensure loop stability, suppress noise, and improve transient response; omitting them risks oscillation or poor regulation under load steps.

How does the POK output function on the MAX1819EBL18?

The POK output on the MAX1819EBL18 is an open-drain N-channel signal that pulls low when V_OUT drops below 93% of its nominal 1.8V value (i.e., <1.674V). It goes high-impedance once regulation is restored. To generate a logic-level signal, connect a 100kΩ pullup resistor from POK to OUT. During shutdown, POK is forced low regardless of output voltage-enabling reliable power-fail detection and microcontroller reset coordination.

Can the MAX1819EBL18 be used in adjustable-output configurations?

Yes-the MAX1819EBL18 supports adjustable output mode via the SET pin. When SET is left unconnected or biased above 50mV, the device enters adjustable mode and regulates V_OUT based on an external resistor divider between OUT and GND. With V_SET = 1.25V, output can be set from 1.25V to 5.0V using R1 = R2 × ((V_OUT/1.25) − 1), where R2 is 25kΩ–100kΩ. In preset mode, SET is tied to GND.

What thermal protection features does the MAX1819EBL18 include?

The MAX1819EBL18 incorporates thermal shutdown that activates at +170°C junction temperature and includes 20°C hysteresis-re-enabling regulation only after cooling to +150°C. This prevents permanent damage during sustained overload or poor PCB heatsinking. Unlike simpler LDOs, it also features in-regulation current limiting (2A) and short-circuit protection (0.55–2.5A), providing layered fault tolerance without external circuitry.