Diodes Incorporated AP7345D-2818RH4-7

Overview

AP7345D-2818RH4-7 from Diodes Incorporated is a dual-channel, 300mA low-dropout linear regulator with fixed 2.8V and 1.8V outputs, high PSRR (75dB at 1kHz), ultra-low output noise (60µV_rms, 10Hz–100kHz), ±1% output voltage accuracy, and CMOS-based architecture enabling low quiescent current (50µA per active channel). It serves as a precision dual power rail for RF and digital core supplies in space-constrained portable electronics.

For engineers reviewing the AP7345D-2818RH4-7 datasheet, AP7345D-2818RH4-7 pinout, AP7345D-2818RH4-7 application, or AP7345D-2818RH4-7 equivalent, key selection criteria include independent enable control per channel, thermal shutdown protection (150°C), low dropout (0.22V at 3.0V–3.6V output), and X2-DFN1612-8 package compatibility with high-density PCB layouts.

Technical Context

The AP7345D-2818RH4-7 integrates two independent LDO regulators on a single CMOS die, each with dedicated error amplifier, voltage reference, current-limit circuit, and enable input. Its architecture supports simultaneous or staggered power-up via EN1/EN2 pins, with separate VIN1/VIN2 inputs allowing mixed-supply domain operation.

Each channel delivers stable 2.8V and 1.8V outputs without external resistors, leveraging factory-trimmed internal resistor networks. The device achieves 75dB PSRR at 1kHz and maintains regulation across –40°C to +85°C ambient, with thermal hysteresis of 20°C ensuring robust recovery after shutdown.

Key Specifications

Pinout & Package

The AP7345D-2818RH4-7 is housed in an X2-DFN1612-8 package (1.6mm × 1.2mm, 0.4mm height) with exposed thermal pad for enhanced heat dissipation. Recommended PCB layout uses large copper area connected to GND under the thermal pad.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6216D2818MR-G and RP512K2818-TR, the AP7345D-2818RH4-7 uniquely balances ultra-low noise, independent channel control, and compact X2-DFN1612-8 packaging - making it optimal for next-gen portable RF systems where board area and spectral purity are critical.

Availability

AP7345D-2818RH4-7 is available at Aetrix Electronics and suitable for smartphone baseband power, RF transceiver supply, camera sensor core logic, and portable media player audio codec applications requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for AP7345D-2818RH4-7 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 AP7345D belongs to Diodes' high-PSRR, low-noise LDO family designed specifically for battery-powered RF and imaging systems demanding dual-rail precision regulation in minimal footprint.

FAQ

What are the recommended input and output capacitor values for AP7345D-2818RH4-7?

A minimum 1.0µF ceramic capacitor is required between each VIN pin and GND, and between each VOUT pin and GND. These must be placed as close as possible to their respective pins to ensure stability and transient response. Low-ESR ceramics (X5R/X7R) are mandatory; bulk capacitance may be added in parallel for high-dynamic-load applications.

Can EN1 and EN2 be tied together for simultaneous channel control?

Yes - EN1 and EN2 can be connected to a common enable signal, but doing so forfeits independent channel sequencing. When tied, both regulators turn on/off simultaneously. Ensure the driving source meets the 1.3V minimum high-threshold and avoids floating states, as undefined logic levels may cause erratic behavior or increased quiescent current.

Does AP7345D-2818RH4-7 include output auto-discharge functionality?

No - the AP7345D-2818RH4-7 does not integrate auto-discharge circuitry. When disabled via EN1/EN2, the outputs remain floating. If rapid VOUT discharge is required, an external bleed resistor or MOSFET switch must be added to each output rail.

How does thermal performance change when only one channel is active?

With only one channel enabled, total power dissipation is halved, reducing junction temperature rise by approximately 40–50% under identical load and ambient conditions. The thermal pad's connection to GND remains critical - even with single-channel operation, full copper coverage under the pad is required to maintain safe operating temperature below 125°C junction limit.