Diodes Incorporated AP7344D-2812RH4-7

Overview

AP7344D-2812RH4-7 from Diodes Incorporated is a dual-channel CMOS low-dropout regulator delivering fixed 2.8V and 1.2V outputs, 300mA per channel, ±1% output voltage accuracy, 75dB PSRR at 1kHz, and 60µVrms output noise (10Hz–100kHz). It operates from 1.7V to 5.25V input and supports independent enable control for each regulator-ideal for powering RF circuitry and baseband logic in compact portable devices.

For engineers reviewing the AP7344D-2812RH4-7 datasheet, AP7344D-2812RH4-7 pinout, AP7344D-2812RH4-7 application, or AP7344D-2812RH4-7 equivalent, key selection criteria include dual-rail sequencing capability, ultra-low quiescent current (50µA per active channel), thermal performance in X2-DFN1612-8, and discharge functionality for rapid VOUT ramp-down.

Technical Context

The AP7344D-2812RH4-7 integrates two independent LDO regulators sharing a common ground but with separate VIN, EN, and VOUT pins. Each channel uses a CMOS pass device with integrated error amplifier, voltage reference, and current-limit protection. The D-suffix denotes built-in auto-discharge circuitry on both outputs, enabling fast output discharge when disabled.

Its architecture supports simultaneous or staggered power-up via independent EN1/EN2 control, with guaranteed 300mA output per rail across −40°C to +85°C ambient. Dropout voltage ranges from 0.22V (3.0V < VOUT ≤ 3.6V) to 0.59V (VOUT ≤ 1.2V) at full load, enabling efficient operation under tight input-output margins.

Key Specifications

Pinout & Package

X2-DFN1612-8 package: 1.6mm × 1.2mm, 0.4mm pitch, 0.39mm nominal height, thermal pad exposed on bottom for PCB copper thermal relief.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP7344D-2812RH4-7, the AP7345D offers measurable PSRR and thermal improvements for next-gen designs, while the TPL7407LDR increases component count and forfeits sequencing control-making the AP7344D optimal for cost- and size-sensitive consumer portable applications where its spec set remains fully adequate.

Availability

AP7344D-2812RH4-7 is available at Aetrix Electronics and suitable for smartphone baseband power, portable camera modules, and wireless adapter SoC supplies requiring stable component supply, consistent parametric performance, and long-term obsolescence management.

Supply support for AP7344D-2812RH4-7 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 connectivity solutions for consumer, industrial, and automotive markets.

The AP7344 series belongs to Diodes' high-PSRR, low-noise LDO portfolio designed specifically for noise-sensitive portable electronics-emphasizing minimal footprint, dual-rail flexibility, and robust transient response in battery-powered systems.

FAQ

Is AP7344D-2812RH4-7 recommended for new designs?

No-the official Diodes datasheet states "AP7344 IS NOT RECOMMENDED FOR NEW DESIGNS. PLEASE USE THE AP7345D." However, AP7344D-2812RH4-7 remains actively manufactured and supported for legacy design refresh, cost-sensitive production, and applications where its 75dB PSRR and 60µVrms noise meet specification requirements without needing the AP7345D's enhanced specs.

What is the purpose of the thermal pad on the X2-DFN1612-8 package?

The exposed thermal pad on the underside of the X2-DFN1612-8 package must be soldered to a large PCB copper area connected to GND to dissipate heat effectively. It is not an electrical GND terminal by itself but enhances thermal resistance by up to 40°C/W when properly implemented-critical for maintaining 300mA output capability at +85°C ambient.

Can EN1 and EN2 be tied together for simultaneous control?

Yes-EN1 and EN2 may be connected to a single GPIO or pull-up resistor for synchronized enable/disable of both regulators. However, doing so forfeits independent rail sequencing. If staggered startup is required (e.g., 2.8V before 1.2V), EN1 and EN2 must be driven separately with appropriate timing delays in firmware or hardware.

Does the discharge function affect quiescent current in shutdown mode?

No-the 0.1µA typical ISTANDBY (both EN low) includes only leakage through the enable inputs and internal bias circuitry; the discharge FET is fully off and contributes negligible current. Discharge current flows only during the brief transition period (microseconds) when VOUT collapses from nominal to near-zero, not during steady-state shutdown.