Diodes Incorporated AP7353D-31CV4-7

Overview

AP7353D-31CV4-7 from Diodes Incorporated is a 250mA low-dropout linear regulator with fixed 3.1V output, ±1% accuracy, 90dB PSRR at 1kHz, 10µV_rms output noise (10Hz–100kHz), and 18µA typical quiescent current. It features an enable input, thermal shutdown, short-circuit protection, and integrated auto-discharge functionality. Designed for RF supply rails in portable communication devices, it operates from 2.0V to 5.5V input and delivers stable voltage under fast load transients.

For engineers reviewing the AP7353D-31CV4-7 datasheet, AP7353D-31CV4-7 pinout, AP7353D-31CV4-7 application, or AP7353D-31CV4-7 equivalent, key selection criteria include dropout voltage at 250mA (68mV typ. @ 3.1V), EN logic thresholds (0.4V low / 1.2V high), thermal resistance (150°C/W), discharge path resistance (35Ω), and compatibility with 1µF ceramic output capacitors.

Technical Context

The AP7353D integrates a CMOS-based error amplifier, precision voltage reference, current-limit circuit, and thermal shutdown. Its auto-discharge function actively pulls the output to ground when disabled via the EN pin, preventing residual voltage hold-up in battery-sensitive systems.

This regulator uses a PMOS pass element architecture enabling ultra-low quiescent current and high PSRR across 100Hz–10kHz. The fixed 3.1V output is set by an internal resistor network, eliminating external feedback components and reducing PCB footprint in space-constrained handheld designs.

Key Specifications

Pinout & Package

AP7353D-31CV4-7 is packaged in X1-WLB0707-4 (Type A1), a 0.7mm × 0.7mm wafer-level chip-scale package with 4 solder bumps and exposed thermal pad. This ultra-compact, lead-free RoHS-compliant package enables high-density layouts in smartphones and wearables.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1703T-3102E/MB and XC6210B312MR-G, AP7353D-31CV4-7 uniquely combines ultra-low IQ (18µA), integrated auto-discharge (35Ω), and wafer-level packaging (0.7×0.7mm) - making it optimal for space- and battery-constrained RF and wearable applications requiring precise power sequencing.

Availability

AP7353D-31CV4-7 is available at Aetrix Electronics and suitable for smartphone RF supplies, wearable sensor bias rails, camera module core voltage, and wireless audio codec power requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for AP7353D-31CV4-7 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 consumer, computing, communications, industrial, and automotive markets.

The AP7353 series belongs to Diodes' high-performance LDO portfolio, engineered specifically for battery-powered portable electronics demanding ultra-low noise, high PSRR, and minimal footprint - with emphasis on RF and imaging subsystems.

FAQ

What is the minimum input voltage required for AP7353D-31CV4-7 to maintain 3.1V output at 250mA?

The typical dropout voltage is 68mV at 3.1V/250mA, so the minimum input voltage is 3.168V. However, the absolute minimum specified input is 2.0V - meaning regulation is guaranteed only when VIN ≥ VOUT + dropout, and the device will cease regulation below that threshold. Always design with margin for temperature and process variation.

Does AP7353D-31CV4-7 require an external capacitor on the EN pin for noise immunity?

No external capacitor is required on the EN pin. The EN input has built-in hysteresis and is specified to tolerate up to 1.0µA leakage. For noisy environments, a 100pF ceramic capacitor to GND may be added, but it is not mandatory - robust operation is achieved with direct GPIO connection per the 0.4V/1.2V logic thresholds.

Can AP7353D-31CV4-7 be used with a 0.47µF output capacitor?

No - the minimum effective output capacitance is 0.7µF, accounting for temperature, DC bias, and tolerance derating of ceramic capacitors. Using 0.47µF risks instability, poor transient response, and potential oscillation. Always use ≥1µF X7R/X5R ceramic with ESR <2Ω, placed adjacent to OUT and GND pins.

Is the exposed thermal pad (EP) electrically connected to GND internally?

No - the EP is not internally connected to any die node. It serves solely as a thermal conduction path. Per the datasheet, it must be connected to PCB GND plane using multiple vias for optimal thermal dissipation, but must not be used as the sole GND electrode - the dedicated GND bump (Pin 3) remains the primary signal return path.