Analog Devices Inc./Maxim Integrated MAX1819EBL33

Overview

MAX1819EBL33 from Maxim Integrated is a 3.3V fixed-output, 500mA low-dropout linear regulator with ±1% initial output accuracy, 125µA ground current at full load, and 90mV dropout at 500mA. It features an active-low open-drain POK output, 0.1µA shutdown current, and thermal/short-circuit protection - designed for space-constrained portable systems including notebook computers and USB hubs.

For engineers reviewing the MAX1819EBL33 datasheet, MAX1819EBL33 pinout, MAX1819EBL33 application, or MAX1819EBL33 equivalent, this page delivers verified electrical parameters, UCSP package layout, real-world use cases, and validated alternative parts for battery-powered LDO selection.

Technical Context

The MAX1819EBL33 uses an internal PMOS pass transistor (R_DS(ON) ≈ 0.25Ω) enabling low dropout and load-independent quiescent current. Its Dual Mode™ architecture selects between factory-trimmed 3.3V regulation (SET = GND) or adjustable mode (via external resistor divider), with V_SET threshold of 50–150mV.

It integrates a 1.25V reference, error amplifier, thermal shutdown (170°C, 20°C hysteresis), and in-regulation current limit (2A typical). The POK output asserts low when V_OUT falls below 93% of nominal (3.069V), with 100kΩ pullup to OUT recommended for microcontroller monitoring.

Key Specifications

Pinout & Package

MAX1819EBL33 is housed in a 6-pin UCSP (Ultra-Compact Silicon Package) measuring 1.5mm × 1.5mm × 0.6mm, with solder balls on bottom side (ball grid array). Thermal pad is not present; PCB copper area under package aids heatsinking.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO regulator applications.

Compared with MAX1819EBL33, the XC6219B332MR-G offers lower cost but sacrifices POK monitoring and thermal hysteresis, while the ADP125ARHZ-3.3-R7 provides automotive-grade reliability at the expense of larger size and missing Dual Mode flexibility - making MAX1819EBL33 optimal for compact, feature-rich portable designs requiring guaranteed 3.3V accuracy and system-level power supervision.

Availability

MAX1819EBL33 is available at Aetrix Electronics and suitable for notebook computers, USB hubs, and cellular phone power management requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for MAX1819EBL33 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 portable, industrial, and communications systems.

The MAX1819 belongs to Maxim's low-dropout linear regulator product line, engineered specifically for battery-powered devices demanding ultra-low quiescent current, miniature packaging, and integrated power-good signaling without external components.

FAQ

What is the guaranteed dropout voltage for MAX1819EBL33 at 500mA load?

The MAX1819EBL33 guarantees a maximum dropout voltage of 280mV at 500mA load and -40°C to +85°C ambient temperature, with 90mV typical at +25°C. This value is measured as VIN – VOUT when VOUT drops 100mV below its nominal 3.3V value, reflecting true low-input-headroom capability critical for Li-ion battery discharge curves.

Does MAX1819EBL33 support adjustable output voltage, or is it strictly fixed at 3.3V?

The MAX1819EBL33 supports both modes via its Dual Mode™ architecture: it delivers a factory-trimmed 3.3V output when the SET pin is connected to GND, but becomes adjustable from 1.25V to 5V when SET is biased via an external resistor divider between OUT and GND - confirmed in the Selector Guide and Functional Diagram.

What is the purpose and required external component for the POK pin on MAX1819EBL33?

The POK (Power-OK) pin on MAX1819EBL33 is an open-drain output that pulls low when VOUT falls below 93% of 3.3V (i.e., 3.069V). To generate a valid logic-high signal, a 100kΩ pullup resistor must be connected from POK to OUT, enabling direct interfacing with microcontrollers for power sequencing and fault detection without additional supervisory ICs.

How does thermal protection operate on MAX1819EBL33, and what happens during sustained overload?

MAX1819EBL33 activates thermal shutdown at 170°C junction temperature, turning off the pass transistor until the die cools by 20°C hysteresis. During continuous overload, this results in pulsed output behavior rather than latch-off, allowing safe self-recovery. The absolute maximum junction temperature remains +150°C for continuous operation, requiring adequate PCB copper area per the 840mW dissipation rating.

What are the minimum and recommended output capacitors for stable operation of MAX1819EBL33?

MAX1819EBL33 requires a minimum 3.3µF low-ESR ceramic capacitor at the OUT pin for stability across -40°C to +85°C. For improved transient response and PSRR, a 10µF ceramic capacitor is recommended. ESR must be ≤0.1Ω; for 3.3V output, X5R/X7R 0603 or 0805 packages meet this requirement and fit the UCSP layout.