Diodes Incorporated AP7340D-23FS4-7

Overview

AP7340D-23FS4-7 from Diodes Incorporated is a 2.3V fixed-output, 150mA low-dropout linear regulator with ±1% output voltage accuracy, 75dB PSRR at 1kHz, and 60µV_RMS output noise (10Hz–100kHz). Built on CMOS process, it features enable control, thermal shutdown, short-circuit protection, and integrated auto-discharge functionality. It powers RF supply rails in portable wireless communication devices where low noise and high PSRR are critical.

For engineers reviewing the AP7340D-23FS4-7 datasheet, AP7340D-23FS4-7 pinout, AP7340D-23FS4-7 application, or AP7340D-23FS4-7 equivalent, this LDO delivers stable 2.3V biasing for sensitive analog/RF circuitry while supporting ultra-low quiescent current (35µA typical) and fast load transient response in space-constrained PCB layouts.

Technical Context

The AP7340D-23FS4-7 integrates a precision voltage reference, error amplifier, current-limit circuit, and NMOS pass transistor with built-in discharge path (EN = low → VOUT actively discharged via 30Ω internal resistor). Its CMOS architecture enables low dropout (210mV at 150mA for 2.3V output) and minimal quiescent current across temperature.

It operates from 1.7V to 5.25V input, supports 150mA continuous output, and maintains ±1.5% output accuracy over –40°C to +85°C ambient. The EN pin has defined logic thresholds (V_IL ≤ 0.5V, V_IH ≥ 1.3V), enabling direct interface with 1.8V/3.3V GPIOs without level shifting.

Key Specifications

Pinout & Package

The AP7340D-23FS4-7 is housed in a 1.0mm × 1.0mm X2-DFN1010-4 package with exposed thermal pad, optimized for minimal footprint and high thermal efficiency in portable designs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-noise, enable-controlled LDO applications.

Compared with MCP1700T-2302E/MB and XC6210B232MR-G, the AP7340D-23FS4-7 uniquely combines 75dB PSRR, 60µV_RMS noise, and integrated 30Ω auto-discharge in a 1.0mm × 1.0mm DFN - making it optimal for compact RF and imaging subsystems requiring rapid, safe power-down without added components.

Availability

AP7340D-23FS4-7 is available at Aetrix Electronics and suitable for RF power amplifier biasing, camera sensor analog supply, and portable media player audio codec applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for AP7340D-23FS4-7 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 communications markets.

The AP7340 series belongs to Diodes' high-PSRR, low-noise LDO product line, designed specifically for noise-sensitive analog and RF subsystems in battery-powered portable electronics where size, efficiency, and signal purity are critical.

FAQ

What is the purpose of the thermal pad on the AP7340D-23FS4-7 package?

The exposed thermal pad on the X2-DFN1010-4 package improves heat dissipation from the die to the PCB. It must be soldered to a large copper area connected to GND for optimal thermal performance - reducing junction temperature rise by up to 40°C under 150mA load, thereby enhancing reliability and enabling sustained full-current operation.

Does the AP7340D-23FS4-7 require external capacitors, and what values are recommended?

Yes - a 0.47µF ceramic capacitor is required between VIN and GND, and another 0.47µF ceramic capacitor between VOUT and GND. Both must be placed as close as possible to their respective pins. These values ensure stability, minimize input ripple, and provide adequate transient response for load steps up to 150mA with <100mV undershoot/overshoot.

How does the auto-discharge feature work, and when is it active?

The auto-discharge feature activates only when the EN pin is driven low (≤0.5V), turning off regulation and connecting VOUT to GND through an internal 30Ω NMOS transistor. This rapidly discharges output capacitance - typically within 100µs for 1µF - preventing back-powering, ensuring clean power sequencing, and avoiding latch-up in multi-rail systems.

Can the AP7340D-23FS4-7 operate from a 1.8V input supply?

Yes - the AP7340D-23FS4-7 supports input voltages as low as 1.7V. With a 2.3V output, the minimum dropout is 210mV at 150mA, so 1.8V input yields ~150mV headroom. Operation is guaranteed down to 1.7V, but output current capability decreases linearly below VIN = VOUT + 0.25V due to reduced gate drive margin on the NMOS pass device.