Diodes Incorporated AP7353-36CV4-7

Overview

AP7353-36CV4-7 from Diodes Incorporated is a 250mA low-dropout linear regulator with fixed 3.6V output, ±1% accuracy, 90dB PSRR at 1kHz, 10µV_rms output noise (10Hz–100kHz), and 18µA typical quiescent current. It features CMOS-based architecture, enable control, thermal shutdown, and short-circuit protection - deployed in battery-powered RF and portable media systems where stable, low-noise biasing is critical.

For engineers reviewing the AP7353-36CV4-7 datasheet, AP7353-36CV4-7 pinout, AP7353-36CV4-7 application, or AP7353-36CV4-7 equivalent, key selection criteria include dropout voltage at 250mA (119mV max for 3.6V output), EN logic thresholds (0.4V low / 1.2V high), thermal resistance (150°C/W), and compatibility with 1µF ceramic output capacitors.

Technical Context

The AP7353-36CV4-7 implements a CMOS-based LDO topology with integrated voltage reference, error amplifier, current-limit circuit, and thermal shutdown. Its non-discharge configuration avoids automatic output discharge during disable, preserving downstream capacitor charge.

It operates across 2.0V–5.5V input range and delivers regulated 3.6V output with 0.02%/V line regulation and 0.001%/mA load regulation (X1-WLB0707-4 package). Fast transient response (<20µs load step recovery) and high PSRR (>70dB up to 10kHz) support sensitive analog/RF supply domains.

Key Specifications

Pinout & Package

AP7353-36CV4-7 uses the X1-WLB0707-4 (Type A1) wafer-level chip-scale package (0.7mm × 0.7mm, 0.395mm height), featuring four solder bumps and an exposed thermal pad (EP) for enhanced heat dissipation. PCB layout requires large copper area under EP connected to GND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP7361-36YG-7, AP7353-36CV4-7 offers lower quiescent current and better noise performance in identical packaging; versus MCP1703T-3602E/MB, it delivers superior PSRR and lower dropout at the cost of slightly higher I_Q, making it optimal for RF-sensitive, size-constrained portable designs.

Availability

AP7353-36CV4-7 is available at Aetrix Electronics and suitable for smartphone baseband power, wearable sensor hubs, and portable media decoder applications requiring stable component supply, long-term manufacturability, and RoHS-compliant sourcing.

Supply support for AP7353-36CV4-7 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 belongs to Diodes' high-PSRR, low-noise LDO family designed specifically for noise-sensitive portable electronics - emphasizing minimal footprint, battery longevity, and robust transient behavior in dense PCB layouts.

FAQ

What is the minimum input voltage required for AP7353-36CV4-7 to maintain regulation at 250mA?

The maximum dropout voltage at 250mA and 3.6V output is 119mV (per datasheet Table 4, X1-WLB0707-4). Therefore, minimum valid input voltage is 3.6V + 0.119V = 3.719V. Operation below this voltage results in unregulated output, though the device remains functional down to 2.0V input in dropout mode.

Can AP7353-36CV4-7 be used with a 0.47µF output capacitor?

No - the datasheet specifies a minimum effective capacitance of 0.7µF (accounting for temperature, DC bias, and tolerance derating). A 0.47µF capacitor falls below this threshold and risks instability or excessive overshoot during load transients. Use ≥1µF X7R/X5R ceramic with ESR < 2Ω, placed adjacent to OUT and GND pins.

Does AP7353-36CV4-7 include reverse-current protection?

No - the AP7353-36CV4-7 lacks internal reverse-current blocking. When disabled (EN = low), the output can back-drive into the input if V_OUT > V_IN, since the pass element is an N-channel MOSFET without body-diode isolation. External protection (e.g., series Schottky) is required in bidirectional power domains.

Is the exposed pad (EP) on AP7353-36CV4-7 electrically connected to GND?

Yes - the EP is internally connected to the GND terminal (Bump 3) and must be soldered to a PCB copper pour tied to system ground. This connection provides both thermal conduction (reducing θ_JA by ~30%) and low-impedance grounding for noise suppression; leaving it unconnected degrades thermal performance and may cause instability.