Diodes Incorporated AP7330D-W5-7

Overview

AP7330D-W5-7 from Diodes Incorporated is a 300mA adjustable low-dropout linear regulator with ±1% output voltage accuracy, 80dB PSRR at 1kHz, and 60µV_rms output noise (10Hz–100kHz), designed for RF supply and portable media applications requiring stable, low-noise biasing in space-constrained layouts.

For engineers reviewing the AP7330D-W5-7 datasheet, AP7330D-W5-7 pinout, AP7330D-W5-7 application, or AP7330D-W5-7 equivalent, key selection criteria include dropout voltage vs. output voltage (e.g., 0.22V at V_OUT = 4.2V), EN input logic thresholds (0.5V low / 1.4V high), thermal shutdown behavior (+150°C trip), and built-in auto-discharge functionality enabled by the "D" suffix.

Technical Context

The AP7330D-W5-7 implements a CMOS-based LDO architecture with internal 0.8V reference, error amplifier, current-limit circuitry, and NMOS pass transistor. Its enable-controlled operation supports dynamic power sequencing, while the ADJ pin enables precise external resistor-divider programming of V_OUT from 1.0V to 4.5V.

It features built-in short-circuit protection (fold-back current limit ~55mA), thermal shutdown with +20°C hysteresis, and auto-discharge via an internal 40Ω N-channel switch activated when EN = 0V - a distinguishing feature versus non-D variants that lack this path.

Key Specifications

Pinout & Package

AP7330D-W5-7 is housed in a 5-pin SOT25 package (3.0 × 2.8 × 1.3 mm), optimized for high-density portable PCBs with minimal thermal pad area. The package supports θ_JA = 179°C/W on JEDEC-standard 2"×2" multilayer board.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1703T-3302E/MB and XC6210B332MR-G, the AP7330D-W5-7 uniquely combines adjustable output, enable-controlled auto-discharge, and best-in-class 80dB PSRR - making it optimal for multi-rail, battery-sensitive RF and imaging systems requiring precise power sequencing and noise isolation.

Availability

AP7330D-W5-7 is available at Aetrix Electronics and suitable for smartphone RF supply, portable camera sensor bias, and wireless adapter baseband core applications requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for AP7330D-W5-7 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-reliability power management, signal integrity, and protection solutions for consumer, industrial, and communications markets.

The AP7330 series belongs to Diodes' high-PSRR, low-noise LDO portfolio, engineered specifically for noise-sensitive portable electronics where RF performance, battery efficiency, and small-footprint power integrity are critical design constraints.

FAQ

What is the purpose of the ADJ pin on AP7330D-W5-7?

The ADJ pin connects to the center node of an external resistor divider (R1/R2) that sets the output voltage according to V_OUT = 0.8V × (1 + R1/R2). It references an internal 0.8V bandgap, and R2 must be ≤10kΩ to maintain stability and minimize noise coupling. This enables precise, user-defined V_OUT from 1.0V to 4.5V without requiring multiple fixed-output SKUs.

How does the "D" suffix affect functionality compared to AP7330-W5-7?

The "D" suffix denotes integrated auto-discharge functionality: when EN is pulled low, a 40Ω internal NMOS switch connects VOUT to GND, actively discharging output capacitance. Non-D versions lack this path, leaving VOUT floating or slowly decaying via load leakage. This is essential for safe multi-rail power-down sequencing in systems with shared capacitive loads or strict voltage monotonicity requirements.

Can AP7330D-W5-7 operate with only a 1µF output capacitor?

Yes - the AP7330D-W5-7 is internally compensated and stable with ≥1µF ceramic output capacitors (X5R/X7R), provided ESR is <10mΩ. For high-transient applications (e.g., burst-mode RF transmission), adding a parallel 10–22µF low-ESR tantalum or polymer capacitor improves load-step response. Layout best practice requires placing the 1µF cap within 2mm of VOUT and GND pins.

What thermal derating applies at 85°C ambient in SOT25 package?

At T_A = +85°C, maximum continuous output current is reduced to ~220mA due to thermal limits. With θ_JA = 179°C/W and P_D(max) = 300mW, junction temperature rise is ΔT_J = P_D × θ_JA. At 300mA and 0.3V dropout, P_D = 90mW → ΔT_J ≈ 16°C, so T_J remains well below +150°C shutdown threshold even at full load and 85°C ambient - no derating needed unless PCB copper area is severely restricted.