Analog Devices Inc./Maxim Integrated MAX77324EWTAD+T

Overview

MAX77324EWTAD+T from Analog Devices is a single-channel synchronous step-down (buck) converter delivering up to 1.5A output current, operating from 2.5V–4.8V input (Li⁺ battery compatible), with adjustable 0.6V–2.0V output voltage (±2% accuracy), 93% peak efficiency, and 40µA quiescent current in SKIP mode - optimized for space-constrained portable/wearable and IoT devices.

For engineers reviewing the MAX77324EWTAD+T datasheet, MAX77324EWTAD+T pinout, MAX77324EWTAD+T application, or MAX77324EWTAD+T equivalent, key selection criteria include its 1.22mm × 0.85mm 6-bump WLP package, automatic SKIP/PWM mode transition, 2MHz nominal switching frequency, integrated high-side/low-side MOSFETs, and active output discharge capability.

Technical Context

The MAX77324EWTAD+T implements Maxim's proprietary Quick-PWM™ constant-on-time control architecture, enabling immediate load transient response and pseudo-constant 2MHz switching across input/output voltage ratios. It integrates high-side (100mΩ) and low-side (50mΩ) MOSFETs with cycle-by-cycle current limiting (3.0A typical peak, 1.1A valley) and zero-crossing detection (30mA typical).

Operation automatically transitions between SKIP mode (for <40µA IQ at light load) and PWM mode (2MHz fixed frequency at higher loads), with dedicated EN pin (1.2V logic-high threshold), soft-start (2.34mV/µs FB slew rate), and comprehensive protection including UVLO (2.65V rising), thermal shutdown (165°C), and active LX-to-PGND discharge (100Ω).

Key Specifications

Pinout & Package

MAX77324EWTAD+T uses a 1.22mm × 0.85mm, 0.4mm pitch, 6-bump wafer-level package (WLP) with bottom-side solder bumps. The package is RoHS-compliant and tape-and-reel packaged (T suffix).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar buck converter applications.

Compared with TPS6286515RQYR and RTQ2134BGQW, the MAX77324EWTAD+T uniquely combines automatic SKIP/PWM mode, integrated 100Ω active discharge, and guaranteed ±2% output accuracy over full temperature range - making it optimal for battery-critical wearables where self-managed power states and fast power-down sequencing are essential.

Availability

MAX77324EWTAD+T is available at Aetrix Electronics and suitable for portable/wearable electronics, IoT edge sensors, and medical monitoring devices requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX77324EWTAD+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

Analog Devices is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets with precision, reliability, and innovation.

The MAX77324 belongs to Analog Devices' ultra-compact power management portfolio, designed specifically for space- and power-constrained battery-operated applications such as wearables, hearables, and miniature IoT endpoints.

FAQ

What is the maximum output current capability of the MAX77324EWTAD+T?

The MAX77324EWTAD+T delivers up to 1.5A of continuous output current. Its internal MOSFETs are rated for 3.0A typical peak current limit and 1.1A valley current limit, ensuring stable regulation under transient loads. Derating is required above +70°C ambient per the 841mW power dissipation limit and 95.15°C/W junction-to-ambient thermal resistance.

Does the MAX77324EWTAD+T support pre-biased output startup?

Yes, the MAX77324EWTAD+T supports pre-biased output startup. If the output voltage is below the target level at enable, the device ramps VOUT monotonically at the preset 2.34mV/µs FB slew rate. If VOUT exceeds the target, no switching occurs during soft-start - preventing reverse current flow and ensuring safe power sequencing.

What is the function of the CTOP capacitor in the MAX77324EWTAD+T application circuit?

The CTOP capacitor (recommended 220pF) stabilizes the feedback loop and ensures phase margin across the full output voltage range. It works with the external resistor divider (RTOP/RBOT) to compensate the control loop - omitting or undersizing CTOP risks instability, especially at higher VOUT settings like 1.8V or 2.0V where switching frequency drops slightly.

How does the MAX77324EWTAD+T handle short-circuit conditions?

Under short-circuit, the MAX77324EWTAD+T enters hiccup mode after eight consecutive current-limit events. It disables switching for 8µs, then attempts soft-start recovery. During disable, the 100Ω active discharge path pulls LX to PGND, safely dissipating stored output energy - preventing latch-up and enabling autonomous recovery without host intervention.

Can the MAX77324EWTAD+T be used with a 0402-size output capacitor?

Yes, the MAX77324EWTAD+T can be used with 0402 capacitors, but derating must be verified. For example, a 22µF X5R 0402 capacitor may deliver only ~10–12µF effective capacitance at 1.8V DC bias. The minimum effective output capacitance is 8µF; therefore, layout and DC bias testing are essential to ensure sufficient COUT for load transients and ripple suppression.