Analog Devices Inc./Maxim Integrated MAX1819EBL20+

Overview

MAX1819EBL20+ from Maxim Integrated is a 500mA low-dropout linear regulator with preset 2.0V output, operating from 2.5V to 5.5V input and delivering 90mV dropout at full load. It features ±1% initial output accuracy, 125µA ground current independent of load, and integrated power-OK (POK) monitoring - designed for voltage regulation in space-constrained portable systems such as notebook computers and cellular handsets.

For engineers reviewing the MAX1819EBL20+ datasheet, MAX1819EBL20+ pinout, MAX1819EBL20+ application, or MAX1819EBL20+ equivalent, key selection criteria include guaranteed 500mA output under 2.0V VOUT, UCSP package thermal performance, POK threshold at 93% of nominal, shutdown current ≤0.1µA, and Dual Mode™ SET-pin configuration for preset/adjustable operation.

Technical Context

The MAX1819EBL20+ uses an internal P-channel MOSFET pass transistor (RDS(ON) ≈ 0.25Ω) enabling low dropout and load-independent quiescent current. Its error amplifier compares a 1.25V reference against feedback from either internal resistors (for 2.0V preset) or external SET-divider, with Dual Mode™ comparator selecting mode based on VSET < 50mV.

Protection circuitry includes thermal shutdown at +170°C (20°C hysteresis), short-circuit current limit (0.55–2.5A depending on VIN), and in-regulation current limit at 2A. The open-drain POK output asserts low when VOUT falls below 93% of 2.0V (i.e., 1.86V), sinking 1mA with VOL ≤ 0.1V.

Key Specifications

Pinout & Package

MAX1819EBL20+ is housed in a 6-pin UCSP (Ultra Compact Silicon Package), measuring 1.5mm × 1.5mm × 0.6mm, with solder balls on bottom side for board-level mounting. Thermal performance is optimized with copper area shared among IN, OUT, and GND pins.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A2020PDBVR and MCP1826-2002E/DB, MAX1819EBL20+ uniquely combines 500mA capability, 90mV dropout, integrated POK, and Dual Mode™ configurability in a 1.5mm² UCSP - enabling longer battery runtime, tighter system-level power sequencing, and reduced external component count.

Availability

MAX1819EBL20+ is available at Aetrix Electronics and suitable for notebook computers, cellular handsets, USB hubs, and base station subsystems requiring stable component supply with guaranteed long-term manufacturability and consistent electrical performance.

Supply support for MAX1819EBL20+ 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 where minimal dropout, ultra-low ground current, and compact packaging are critical design constraints.

FAQ

What output voltage does the MAX1819EBL20+ deliver, and how is it set?

The MAX1819EBL20+ delivers a factory-trimmed, fixed 2.0V output with ±1% initial accuracy across temperature and load. This is achieved using internal precision resistive feedback - no external components required. The "20" suffix in MAX1819EBL20+ explicitly denotes the 2.0V preset; the SET pin must be tied to GND to activate this mode. Unlike adjustable variants, no resistor divider is needed or recommended for this version.

Does the MAX1819EBL20+ support adjustable output voltages?

No - the MAX1819EBL20+ is a fixed-output variant configured exclusively for 2.0V operation. While the MAX1819 family supports adjustable outputs via the SET pin, the EBL20+ suffix indicates factory programming for 2.0V preset mode. Connecting an external resistor network to SET will not override this setting; doing so may cause regulation instability or incorrect POK behavior. For adjustable operation, select MAX1819EBLxx with "Adj" designation (e.g., MAX1819EBL15-ADJ).

What is the minimum input voltage required for regulation with the MAX1819EBL20+?

The minimum input voltage for regulation is determined by dropout: VIN(MIN) = VOUT + VDROPOUT. At 500mA load, MAX1819EBL20+ exhibits 90mV dropout, so VIN must be ≥ 2.09V. However, the absolute minimum specified input is 2.5V per Absolute Maximum Ratings - meaning operation below 2.5V is not guaranteed, even if dropout margin exists. Below 2.5V, undervoltage lockout (VUVLO = 2.0–2.3V) may disable regulation entirely.

How does the POK output function on the MAX1819EBL20+?

The POK output on MAX1819EBL20+ is an open-drain N-channel signal that pulls low when VOUT drops below 93% of 2.0V (i.e., 1.86V). It remains high-impedance above that threshold. To generate a logic-high signal, a 100kΩ pull-up resistor from POK to OUT is required. During shutdown, POK is forcibly driven low regardless of output voltage - enabling reliable system power sequencing and microcontroller reset assertion.

What thermal limitations apply to continuous operation of the MAX1819EBL20+?

MAX1819EBL20+ has an absolute maximum junction temperature of +150°C and thermal shutdown activation at +170°C. Continuous operation must stay within the 840mW power dissipation limit at +70°C ambient, derating 10.5mW/°C above that. With typical PCB copper area, sustained 500mA output is only feasible when VIN–VOUT ≤ 1.68V (e.g., VIN = 3.68V @ VOUT = 2.0V). Exceeding thermal limits triggers pulsed shutdown with 20°C hysteresis.