Diodes Incorporated AP7353D-285CV4-7

Overview

AP7353D-285CV4-7 from Diodes Incorporated is a 250mA low-dropout linear regulator with fixed 2.85V output, ±1% accuracy, 90dB PSRR at 1kHz, 10µV_rms output noise (10Hz–100kHz), and 18µA typical quiescent current - designed for RF supply rails and battery-powered wearable systems requiring stable, low-noise voltage regulation.

For engineers reviewing the AP7353D-285CV4-7 datasheet, AP7353D-285CV4-7 pinout, AP7353D-285CV4-7 application, or AP7353D-285CV4-7 equivalent, key selection criteria include dropout voltage at 250mA (73mV typ. @ 2.85V), enable-controlled shutdown (0.1µA standby), thermal shutdown protection, and compatibility with 1µF ceramic output capacitors in space-constrained layouts.

Technical Context

The AP7353D integrates a CMOS-based error amplifier, precision voltage reference, current-limit circuit, and active discharge path (enabled when EN = low) to rapidly bleed residual charge from the output capacitor. Its architecture supports fast load transient response (<20µs recovery for 1mA→250mA step) and maintains stability with minimal 0.7µF effective C_OUT.

It operates across 2.0V–5.5V input range and delivers regulated 2.85V output with <±30ppm/°C temperature coefficient. The device features built-in short-circuit protection (≈350mA clamp), thermal shutdown, and EN logic thresholds (V_IL ≤ 0.4V, V_IH ≥ 1.2V) compatible with standard CMOS I/O.

Key Specifications

Pinout & Package

X1-WLB0707-4 (Type A1) wafer-level chip-scale package (0.7mm × 0.7mm, 0.4mm height) with exposed thermal pad; optimized for ultra-dense portable PCBs and thermal performance via direct GND copper connection.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1703T-285E/MB and XC6210B285MR-G, AP7353D-285CV4-7 uniquely combines 250mA capability, 90dB PSRR, 10µV_rms noise, and integrated discharge - making it optimal for RF-intensive, battery-critical wearable and mobile applications where all four attributes are simultaneously required.

Availability

AP7353D-285CV4-7 is available at Aetrix Electronics and suitable for smartphone camera modules, Bluetooth LE audio transmitters, and industrial wireless sensor nodes requiring stable component supply with guaranteed long-term manufacturability.

Supply support for AP7353D-285CV4-7 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 series belongs to Diodes' high-PSRR, low-noise LDO product line, engineered specifically for noise-sensitive portable electronics where RF coexistence, battery longevity, and board-area efficiency are critical design constraints.

FAQ

What is the minimum input voltage required for AP7353D-285CV4-7 to maintain regulation at 250mA?

The minimum input voltage is determined by dropout: at 250mA and 2.85V output, typical dropout is 73mV (max 152mV). Thus, VIN must be ≥ 2.923V (2.85V + 0.073V) for guaranteed regulation. With worst-case 152mV dropout, VIN ≥ 3.002V ensures operation across temperature and process variation.

Does AP7353D-285CV4-7 require an external resistor network to set output voltage?

No. AP7353D-285CV4-7 uses an internally trimmed resistor divider to deliver fixed 2.85V output. No external resistors are needed, simplifying layout and eliminating tolerance stack-up errors associated with adjustable LDOs.

Can the exposed thermal pad (EP) be left unconnected in PCB layout?

No. The EP must be soldered to a dedicated GND copper pour. Leaving it unconnected degrades thermal resistance (θ_JA rises from 150°C/W to >200°C/W), increases junction temperature under load, and risks thermal shutdown during sustained 250mA operation.

How does the discharge function behave during EN assertion?

When EN transitions from high to low, the internal 35Ω NMOS FET connects OUT to GND, discharging the output capacitor. Discharge begins within 180µs (turn-on time spec applies to enable, not disable), and completes typically within 1–2ms depending on C_OUT value and load leakage.