Diodes Incorporated AP7343D-20W5-7

Overview

AP7343D-20W5-7 from Diodes Incorporated is a 300mA, 2.0V fixed-output low-dropout linear regulator with high PSRR (75dB at 1kHz), ultra-low output noise (60µV_rms, 10Hz–100kHz), ±1% output voltage accuracy, and enable-controlled shutdown. Fabricated in CMOS, it delivers stable power to RF supplies and portable media subsystems where low quiescent current (35µA) and fast load transient response are critical.

For engineers reviewing the AP7343D-20W5-7 datasheet, AP7343D-20W5-7 pinout, AP7343D-20W5-7 application, or AP7343D-20W5-7 equivalent, key selection criteria include dropout voltage (≤390mV at 300mA for 2.0V output), thermal shutdown threshold (+150°C), EN input logic thresholds (0.5V_IL/1.3V_IH), and compatibility with 1µF ceramic input/output capacitors.

Technical Context

The AP7343D-20W5-7 integrates a precision voltage reference, error amplifier, current-limit circuit, and thermal shutdown protection within a single CMOS LDO architecture. Its enable input (EN) provides direct digital control of output state, with defined logic thresholds and sub-1µA standby current when disabled.

It features built-in discharge functionality (denoted by "D" suffix), actively pulling VOUT to GND during shutdown via a 30Ω internal N-channel switch. This eliminates residual output voltage and prevents back-powering of downstream circuitry-critical in multi-rail portable systems.

Key Specifications

Pinout & Package

AP7343D-20W5-7 is packaged in SOT25 (5-pin, 2.9mm × 1.6mm × 1.1mm), a surface-mount package optimized for space-constrained portable designs. The exposed pad (EP) must be connected to GND for optimal thermal performance (R_θJA = 179°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700T-2002E/MB and XC6210B202MR-G, AP7343D-20W5-7 uniquely combines 300mA drive, ±1% accuracy, 75dB PSRR, and integrated discharge in SOT25-enabling simpler, more robust power sequencing in space- and noise-sensitive portable RF systems.

Availability

AP7343D-20W5-7 is available at Aetrix Electronics and suitable for smartphone baseband power, RF front-end bias, portable camera ISP core, and Bluetooth LE audio codec applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for AP7343D-20W5-7 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 semiconductor company specializing in discrete, analog, and mixed-signal devices for power management, signal integrity, and connectivity applications.

The AP7343 series targets portable and battery-powered electronics, delivering high-PSRR, low-noise LDO regulation with integrated enable and discharge-optimized for RF, imaging, and ultra-low-power communication subsystems.

FAQ

What is the minimum input voltage required for AP7343D-20W5-7 to regulate 2.0V output at 300mA?

The maximum dropout voltage at 300mA and 2.0V output is 390mV (per Electrical Characteristics table). Therefore, the minimum valid input voltage is 2.0V + 0.39V = 2.39V. Operation below this voltage results in unregulated output and potential foldback current limiting.

Does AP7343D-20W5-7 require an external pull-up resistor on the EN pin?

No external pull-up is required. The EN pin has no internal pull-up; however, it must never be left floating. If enable control is unused, tie EN directly to VIN to maintain continuous operation-this satisfies the V_IH ≥ 1.3V requirement across the full input range (1.7–5.25V).

How does the integrated discharge function behave during shutdown?

When EN is driven low (<0.5V), the internal 30Ω N-channel FET connects VOUT to GND, discharging external output capacitance. Typical discharge time for a 1µF capacitor is under 50µs (τ = R×C ≈ 30Ω × 1µF = 30µs), ensuring rapid VOUT collapse and preventing back-powering of upstream circuitry.

Can AP7343D-20W5-7 be used with ceramic output capacitors smaller than 1µF?

Yes-the device is stable with ceramic capacitors as low as 0.47µF, provided ESR remains ≤10mΩ. However, for loads with large transient currents (e.g., >100mA step changes), a 1µF or larger capacitor is recommended to limit output voltage deviation per the Load Transient Response waveforms in the datasheet.