Diodes Incorporated AP7353-285FS4-7

Overview

AP7353-285FS4-7 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. It operates from 2.0V to 5.5V input and delivers stable power to noise-sensitive RF and analog circuitry in space-constrained portable devices.

For engineers reviewing the AP7353-285FS4-7 datasheet, AP7353-285FS4-7 pinout, AP7353-285FS4-7 application, or AP7353-285FS4-7 equivalent, key selection criteria include dropout voltage at 250mA (73mV typ. at 2.85V), enable control timing (180µs turn-on), thermal resistance (237°C/W), and compatibility with 1µF ceramic output capacitors in X2-DFN1010-4 packaging.

Technical Context

The AP7353-285FS4-7 implements a CMOS-based LDO architecture with integrated voltage reference, error amplifier, and current-limit protection. Its non-discharge configuration avoids automatic output discharge during shutdown, preserving downstream capacitor charge for fast wake-up sequences.

Designed for high-PSRR performance, it achieves 90dB rejection at 1kHz and 70dB at 10kHz under full 250mA load-critical for isolating RF supply rails from digital switching noise. Fast load transient response (<20µs recovery) and 0.004%/mA load regulation ensure stability across dynamic current demands in portable media and wireless adaptors.

Key Specifications

Pinout & Package

X2-DFN1010-4 (Type B) package: 1.0mm × 1.0mm footprint, 0.4mm pitch, exposed thermal pad (EP) for enhanced heat dissipation. Requires solder mask defined pads per Diodes' recommended layout (D2/E2 = 0.48mm, C = 0.65mm).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700-285E/TO and XC6210B285MR-G, AP7353-285FS4-7 uniquely balances 250mA output, 90dB PSRR, and 10µV_rms noise in a 1.0mm² package-making it optimal for RF and imaging subsystems where both current and spectral purity are constrained.

Availability

AP7353-285FS4-7 is available at Aetrix Electronics and suitable for smartphone camera modules, wireless adapter RF supplies, portable media player audio codecs, and wearable biometric sensors requiring stable component supply with guaranteed long-term availability.

Supply support for AP7353-285FS4-7 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 power management, signal integrity, and protection solutions for consumer, industrial, and automotive markets.

The AP7353 series belongs to Diodes' high-performance LDO portfolio, engineered specifically for noise-critical portable electronics where PSRR, output accuracy, and ultra-low IQ must coexist in minimal footprint packages.

FAQ

What is the minimum input voltage required for AP7353-285FS4-7 to maintain regulation at 250mA?

The minimum input voltage is determined by dropout voltage: at 250mA and 2.85V output, typical dropout is 73mV (max 155mV per datasheet). Thus, VIN must be ≥2.923V (2.85V + 0.073V) for guaranteed regulation. With worst-case 155mV dropout, VIN ≥3.005V ensures operation across temperature and process variation.

Can AP7353-285FS4-7 be used with ceramic output capacitors smaller than 1µF?

Yes-the device is stable with ≥0.7µF effective capacitance. However, 1µF is recommended to accommodate capacitance loss from DC bias, temperature drift, and manufacturing tolerance. Using <1µF risks instability under heavy load transients; X7R/X5R dielectrics are mandatory for consistent performance.

Is the exposed pad (EP) on AP7353-285FS4-7 electrically connected to GND?

No-the EP is thermally conductive but electrically isolated. Diodes' datasheet explicitly states it "must not be used as GND electrode function alone." It should be soldered to a large copper area connected to PCB GND for thermal dissipation, but no electrical connection is required or intended.

Does AP7353-285FS4-7 include short-circuit protection?

Yes-it features current-limit protection that clamps output current to ~350mA during short-circuit events, preventing damage from overcurrent. Combined with thermal shutdown (T_J = +125°C), this protects the device during sustained fault conditions while maintaining safe operating area in normal use.