Diodes Incorporated AP7350D-28CF4-7

Overview

AP7350D-28CF4-7 from Diodes Incorporated is a 2.8V fixed-output, 150mA ultra-low quiescent current LDO regulator with active output discharge, housed in the X2-WLB0606-4 wafer-level chip-scale package. It delivers ±1% output voltage accuracy over temperature, supports 2.0V–5.25V input range, and draws only 0.25µA typical quiescent current - enabling multi-year battery life in wearable sensors and IoT edge nodes.

For engineers reviewing the AP7350D-28CF4-7 datasheet, AP7350D-28CF4-7 pinout, AP7350D-28CF4-7 application, or AP7350D-28CF4-7 equivalent, key selection criteria include its 0.19V dropout at 150mA (2.8V output), EN-controlled shutdown with 0.02µA standby current, and integrated active discharge for rapid VOUT decay during power-down - critical for sequencing-sensitive microcontroller subsystems.

Technical Context

The AP7350D-28CF4-7 integrates a precision voltage reference, error amplifier, current-limit protection, and enable-controlled pass transistor within a monolithic CMOS process. Its architecture supports stable regulation down to 2.0V input while maintaining tight load/line regulation (±25mV load regulation, 0.02%/V line regulation) across –40°C to +85°C ambient.

Unlike standard LDOs, this variant includes an internal active discharge path (35Ω typical) activated when EN is low, ensuring VOUT collapses rapidly (<100µs) without external circuitry. The X2-WLB0606-4 package's 0.64mm × 0.64mm footprint and 0.34mm height enable placement directly beneath space-constrained MCUs or RF modules.

Key Specifications

Pinout & Package

AP7350D-28CF4-7 uses the X2-WLB0606-4 wafer-level chip-scale package (0.64mm × 0.64mm × 0.34mm), with SnAgCu solder balls on a 0.35mm pitch. The package is moisture-sensitivity Level 1 (J-STD-020) and RoHS/halogen-free compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700T-2802E/TT and XC6206P282MR-G, AP7350D-28CF4-7 uniquely combines ultra-low IQ (0.25µA), active discharge, and industry-smallest WLCSP - making it the sole option for space-constrained, sequencing-aware, multi-year battery designs.

Availability

AP7350D-28CF4-7 is available at Aetrix Electronics and suitable for wearable electronics, IoT sensor nodes, and compact camera modules requiring stable component supply with guaranteed long-term availability.

Supply support for AP7350D-28CF4-7 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

Diodes Incorporated is a global semiconductor company specializing in discrete, analog, and mixed-signal solutions for power management, signal integrity, and connectivity applications.

The AP7350 series targets ultra-low-power portable electronics, delivering high-accuracy regulation in minimal footprints - specifically engineered for battery longevity and space-constrained form factors.

FAQ

What is the minimum input voltage required for AP7350D-28CF4-7 to maintain regulation?

The AP7350D-28CF4-7 requires VIN ≥ VOUT + dropout voltage. At 150mA load and 2.8V output, dropout is 0.19V (typical), so minimum VIN is 2.99V. At light loads (<1mA), dropout drops below 0.1V, allowing operation down to 2.9V input while maintaining ±1% accuracy.

Does AP7350D-28CF4-7 require external capacitors, and what values are recommended?

Yes - a 0.1µF X5R/X7R ceramic capacitor is required between VIN and GND, and another 0.1µF between VOUT and GND. These must be placed within 1mm of their respective pins. Larger bulk capacitors (e.g., 10µF tantalum) may be added in parallel for high-transient loads, but the 0.1µF ceramics are mandatory for stability.

How does the active discharge function behave during EN deactivation?

When EN is pulled low, the internal 35Ω discharge path connects VOUT to GND, collapsing output voltage exponentially. With a 10µF output capacitor, VOUT falls from 2.8V to 0.1V in under 350µs - preventing back-powering of upstream circuitry and enabling safe, deterministic power sequencing.

Is AP7350D-28CF4-7 qualified for automotive applications?

No - AP7350D-28CF4-7 is not AEC-Q100 qualified. Diodes Incorporated offers automotive-grade variants (e.g., AP7350Q series) with PPAP support and IATF 16949 manufacturing, but this specific part is intended for industrial, consumer, and medical portable devices operating from –40°C to +85°C.