Analog Devices Inc./Maxim Integrated MAX6480BL33AD3-T

Overview

MAX6480BL33AD3-T from Maxim Integrated is a 300mA low-dropout linear regulator with integrated microprocessor reset circuit, fixed 3.3V output, -12.5% reset threshold accuracy, and 150ms minimum reset timeout. It features 82µA quiescent current, 114mV dropout at 300mA load, and operates across -40°C to +85°C. Designed for battery-powered portable systems requiring reliable power sequencing and brownout protection.

For engineers reviewing the MAX6480BL33AD3-T datasheet, MAX6480BL33AD3-T pinout, MAX6480BL33AD3-T application, or MAX6480BL33AD3-T equivalent, key selection criteria include guaranteed 300mA output under low-input-voltage conditions, integrated active-low reset with manual reset input (MR), shutdown capability (0.1µA), and UCSP™ 3×3mm package compatibility with space-constrained handheld and wireless modules.

Technical Context

The MAX6480BL33AD3-T belongs to the MAX6479–MAX6480 variant group, confirmed by its "BL" suffix (indicating -12.5% reset threshold) and "D3" suffix (150ms reset timeout). It integrates a precision LDO core with a dedicated reset supervisor sharing the same reference, enabling coordinated power-good assertion and processor initialization.

This device implements an active-low manual reset input (MR) with internal 40kΩ pullup to VOUT and supports both push-pull and open-drain RESET configurations. Its SET pin enables dual-mode operation-fixed 3.3V output when grounded-but does not require external feedback resistors in this configuration.

Key Specifications

Pinout & Package

MAX6480BL33AD3-T is packaged in a 3 × 3 mm chip-scale package (UCSP™), pin-compatible with other MAX6479–MAX6480 variants. The UCSP uses bump mapping rather than leads; thermal performance relies on soldering the exposed die pad to PCB ground plane.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO-with-reset applications.

Compared with TPS76333QDBVRQ1 and ADM6315-33ARTZ-RL, MAX6480BL33AD3-T uniquely integrates MR input, UCSP packaging, and tighter -12.5% reset threshold in a single 3×3mm footprint-reducing total solution size by ≥40% and eliminating external reset timing components.

Availability

MAX6480BL33AD3-T is available at Aetrix Electronics and suitable for handheld instruments, Bluetooth modules, and digital camera designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX6480BL33AD3-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 industrial, communications, and consumer applications.

The MAX6469–MAX6484 product line was designed specifically for space- and power-constrained portable electronics needing integrated power regulation and microprocessor supervision in minimal footprint.

FAQ

What is the function of the MR pin on the MAX6480BL33AD3-T?

The MR (Manual Reset) pin on the MAX6480BL33AD3-T is an active-low input that forces the RESET output low when asserted, regardless of VOUT level. It features an internal 40kΩ pullup to VOUT, allowing direct connection to a momentary switch without external components. This enables user-triggered or test-initiated system resets while maintaining full regulation - a capability not present in basic LDOs or standalone supervisors. The MAX6480BL33AD3-T holds RESET low for the full 150ms timeout after MR release, ensuring deterministic boot behavior.

Does the MAX6480BL33AD3-T require external capacitors, and what are their values?

Yes, the MAX6480BL33AD3-T requires two external capacitors: a 0.1µF ceramic capacitor between IN and GND for input filtering, and a minimum 3.3µF low-ESR ceramic capacitor between OUT and GND for stability and transient response. These values are specified in the datasheet's Electrical Characteristics table and Typical Operating Circuits. Using smaller or higher-ESR capacitors may cause instability or excessive output ripple. The MAX6480BL33AD3-T's UCSP package has strict layout guidelines - the OUT capacitor must be placed adjacent to the OUT bump (C1) with short, wide traces to minimize inductance.

How does the reset timeout period work on the MAX6480BL33AD3-T?

The MAX6480BL33AD3-T implements a fixed 150ms minimum reset timeout period (denoted by "D3" in the part number), meaning RESET remains low for at least 150ms after VOUT rises above the -12.5% threshold (2.8875V) or after MR is released. This timeout is internally generated and does not require external RC components. It ensures sufficient time for clock oscillators to stabilize and memory controllers to initialize before releasing the processor from reset - critical for reliable boot in battery-powered systems. The actual timeout may vary slightly with temperature but remains ≥150ms across -40°C to +85°C.

Can the MAX6480BL33AD3-T be used with input voltages below 2.5V?

No, the MAX6480BL33AD3-T has a specified input voltage range of 2.5V to 5.5V. Operation below 2.5V violates Absolute Maximum Ratings and may result in undefined behavior, including failure to regulate, incorrect reset assertion, or increased ground current. The device incorporates undervoltage lockout (UVLO) that disables regulation when VIN falls below 2.25V (typical), but this is a protection feature-not an operational specification. For sub-2.5V applications, consider alternative regulators such as the MAX1725 or TPS7A05 series, which are explicitly rated for 1.6V–5.5V input.

Is the MAX6480BL33AD3-T RoHS-compliant and lead-free?

Yes, the MAX6480BL33AD3-T is manufactured in a lead(Pb)-free and RoHS-compliant package. Per Maxim's Ordering Information, lead-free versions are indicated by substituting "+T" for "-T" in the part number (e.g., MAX6480BL33AD3+T), but the -T suffix version is also RoHS-compliant per JEDEC J-STD-609A standards. The UCSP package uses matte tin plating and meets IPC/JEDEC J-STD-020D moisture sensitivity level 1 (MSL-1), allowing unlimited floor life at ≤30°C/60% RH. Full compliance documentation is available through Analog Devices' product change notifications (PCNs).