Diodes Incorporated AP7354D-15W5-7

Overview

AP7354D-15W5-7 from Diodes Incorporated is a 150mA ultra-low quiescent current LDO regulator with fixed 1.5V output, ±1% accuracy at +25°C, 0.25µA typical IQ, and integrated enable control. It operates from 2.0V to 5.5V input and delivers stable power to low-power wearable sensors and IoT edge nodes requiring extended battery life.

For engineers reviewing the AP7354D-15W5-7 datasheet, AP7354D-15W5-7 pinout, AP7354D-15W5-7 application, or AP7354D-15W5-7 equivalent, this page provides verified package mapping (SOT25), terminal roles, dropout voltage at 150mA (0.43V @ VOUT=1.5V), active discharge capability, and real-world use context for battery-constrained designs.

Technical Context

The AP7354D integrates a precision voltage reference, error amplifier, current-limit circuit, and EN-controlled shutdown path. Its architecture supports fast turn-on/turn-off response (typ. 10µs) and maintains regulation down to 2.0V input across -40°C to +85°C ambient.

Unlike standard LDOs, the 'D' variant includes an active output discharge path (35Ω typical) that rapidly pulls VOUT to GND when EN is low-critical for preventing back-powering in multi-rail systems and ensuring clean power sequencing in wearables and sensor modules.

Key Specifications

Pinout & Package

SOT25 package (3.0mm × 2.8mm × 1.3mm), surface-mount, lead-free, RoHS-compliant. Exposed pad not connected; thermal path relies on GND pin conduction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700T-1502E/TT and XC6206P152MR-G, AP7354D-15W5-7 uniquely combines ultra-low IQ, EN control, active discharge, and 150mA drive in SOT25-making it the only option for battery-powered systems requiring both long runtime and deterministic power-down behavior.

Availability

AP7354D-15W5-7 is available at Aetrix Electronics and suitable for wearable electronics, IoT sensor nodes, and wireless camera modules requiring stable component supply with consistent parametric performance across production lots.

Supply support for AP7354D-15W5-7 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 high-reliability applications.

The AP7354 series targets ultra-low-power portable electronics, delivering optimized trade-offs between quiescent current, accuracy, and package size for battery-constrained edge devices.

FAQ

What is the minimum input voltage required for AP7354D-15W5-7 to maintain regulation at 150mA?

The device sustains 1.5V output regulation down to VIN = VOUT + dropout = 1.5V + 0.43V = 1.93V. However, per datasheet specifications, the guaranteed operating range starts at 2.0V input-below which line regulation and accuracy are not assured. At 2.0V input and 150mA load, output remains within ±2% over temperature.

Can the EN pin be left floating, or does it require a pull-up/down resistor?

The EN pin must never be left floating. It must be driven actively high (≥1.0V) or low (≤0.4V). If unused, tie EN directly to VIN to ensure permanent enable-no external resistor needed. Floating EN causes undefined output state and potential shoot-through current due to internal comparator instability.

Does AP7354D-15W5-7 require an external capacitor on the VOUT pin, and what type is recommended?

Yes, a minimum 0.1µF ceramic capacitor (X5R or X7R dielectric) is mandatory on VOUT for stability and transient response. The capacitor must be placed within 2mm of the VOUT and GND pins. Bulk capacitance (e.g., 4.7µF tantalum) may be added in parallel for high-pulse-load applications, but the 0.1µF ceramic is non-optional.

How does the active discharge function behave when EN is pulled low while the input supply remains active?

When EN goes low, the internal discharge FET connects VOUT to GND through a 35Ω typical resistance. This discharges the output capacitor to <0.1V within 100µs (for 0.1µF COUT), regardless of VIN status. The discharge path remains active until EN returns high, preventing back-feeding into other rails or unintended wake-up of downstream circuitry.