Diodes Incorporated AP7353-45CV4-7

Overview

AP7353-45CV4-7 from Diodes Incorporated is a 250mA low-dropout linear regulator with fixed 4.5V output, ±1% accuracy, 90dB PSRR at 1kHz, 10µV_rms output noise (10Hz–100kHz), and 18µA typical quiescent current. It operates from 2.0V to 5.5V input and delivers stable power to RF circuitry, camera modules, and portable media subsystems.

For engineers reviewing the AP7353-45CV4-7 datasheet, AP7353-45CV4-7 pinout, AP7353-45CV4-7 application, or AP7353-45CV4-7 equivalent, key selection criteria include dropout voltage at 250mA (50–114mV), enable control logic thresholds (0.0–0.4V low / 1.2–5.5V high), thermal resistance (150°C/W), and compatibility with 1µF ceramic output capacitors.

Technical Context

The AP7353-45CV4-7 implements a CMOS-based LDO architecture with integrated voltage reference, error amplifier, current-limit protection, and thermal shutdown. Its non-discharge configuration avoids automatic output discharge during disable, preserving downstream capacitor charge.

It supports fast load transient response (<20µs recovery for 1mA→250mA step) and maintains stability with minimal external components: only 1µF input and output ceramic capacitors are required. The device uses an internal resistor network to fix V_OUT at 4.5V and features EN-controlled on/off sequencing with 180µs typical turn-on time.

Key Specifications

Pinout & Package

AP7353-45CV4-7 is packaged in X1-WLB0707-4 (Type A1), a 0.64mm × 0.64mm wafer-level chip-scale package with 4 solder bumps and exposed thermal pad. This ultra-compact footprint reduces PCB area by >60% vs. SOT-23 while enabling efficient thermal dissipation via the EP connection to GND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1703T-4502E/MB and XC6210B452MR-G, AP7353-45CV4-7 uniquely balances ultra-low noise (10µV_rms), industry-leading PSRR (90dB), and wafer-level miniaturization (0.64mm²), making it optimal for space-constrained, noise-critical portable RF systems.

Availability

AP7353-45CV4-7 is available at Aetrix Electronics and suitable for smartphone camera modules, wireless audio codec supplies, and portable medical sensor hubs requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for AP7353-45CV4-7 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 manufacturer of discrete semiconductors and analog ICs, specializing in high-performance power management, signal integrity, and protection solutions for consumer, industrial, and automotive markets.

The AP7353 belongs to Diodes' high-PSRR, low-noise LDO family designed specifically for noise-sensitive portable electronics-including smartphones, wearables, and wireless peripherals-where battery life, signal fidelity, and miniaturization are critical.

FAQ

What is the minimum input voltage required for AP7353-45CV4-7 to maintain regulation at full 250mA load?

The minimum input voltage depends on the dropout voltage at 250mA, which ranges from 50mV to 114mV per the datasheet. For guaranteed 4.5V output under worst-case conditions, VIN must be ≥ 4.614V. At typical conditions (50mV dropout), VIN ≥ 4.55V suffices. Operation below 4.55V risks output droop or instability.

Can AP7353-45CV4-7 be used with ceramic output capacitors smaller than 1µF?

Yes-the AP7353 is stable with output capacitance as low as 0.7µF, accounting for temperature, DC bias, and tolerance derating. However, using <1µF reduces transient response margin and may compromise stability under large load steps. Diodes recommends 1µF X7R/X5R ceramics placed within 2mm of OUT and GND pins for robust performance.

Is the exposed pad (EP) of AP7353-45CV4-7 electrically connected internally?

No-the exposed pad is not internally connected to any die node. It serves solely as a thermal interface. Per the datasheet, it should be connected to a large GND copper area on the PCB for heat dissipation, but must not be used as the sole GND electrode. The dedicated GND bump (Pin 3) remains the primary current return path.

Does AP7353-45CV4-7 include short-circuit protection?

Yes-it features foldback current limiting that clamps output current to approximately 350mA during short-circuit events. Combined with thermal shutdown (triggered at TJ = +125°C), this protects the device from damage due to sustained overcurrent or excessive ambient temperature. Recovery is automatic once fault conditions are removed.