Diodes Incorporated AP7335-28SNG-7

Overview

AP7335-28SNG-7 from Diodes Incorporated is a fixed-output 2.8V, 300mA low-dropout linear regulator in DFN2020-6 package, featuring 35μA quiescent current, 150mV dropout at full load, 65dB PSRR at 1kHz, and fast 220μs startup. It integrates enable control, thermal shutdown, and current limiting, and is optimized for battery-powered portable electronics requiring stable low-voltage rail generation.

For engineers reviewing the AP7335-28SNG-7 datasheet, AP7335-28SNG-7 pinout, AP7335-28SNG-7 application, or AP7335-28SNG-7 equivalent, key selection criteria include its 2.8V fixed output, ultra-low IQ, DFN2020-6 thermal performance (θJA = 251°C/W), stability with 1μF ceramic output capacitor, and EN-controlled sequencing in space-constrained mobile designs.

Technical Context

The AP7335-28SNG-7 implements a PMOS pass transistor architecture enabling low dropout and high PSRR without requiring external compensation. Its internal 0.8V bandgap reference and error amplifier regulate output precisely across -40°C to +85°C ambient range.

Enable logic operates with VIH ≥ 1.4V and VIL ≤ 0.4V, supporting direct connection to 1.8V/3.3V GPIOs. Protection circuitry includes foldback current limiting (typ. 600mA), short-circuit clamping (~140mA), and thermal shutdown activation at 145°C with 15°C hysteresis.

Key Specifications

Pinout & Package

AP7335-28SNG-7 uses the DFN2020-6 (2.0mm × 2.0mm, 0.65mm pitch) package with exposed thermal pad for enhanced heat dissipation. Pin 1 is EN, Pin 2 is GND, Pin 3 is IN, Pin 4 is OUT, Pin 5 is NC, Pin 6 is NC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700-2802E/TO and XC6206P282MR-G, AP7335-28SNG-7 uniquely balances 300mA drive, 35μA IQ, 150mV dropout, and EN control in a thermally efficient 2×2mm DFN-making it the only viable choice for compact, high-efficiency 2.8V mobile power rails.

Availability

AP7335-28SNG-7 is available at Aetrix Electronics and suitable for smartphone baseband power, Bluetooth audio SoC supply, wearable sensor hub regulation requiring stable component supply across high-volume production cycles.

Supply support for AP7335-28SNG-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 manufacturer specializing in discrete, analog, and mixed-signal solutions for power management, signal integrity, and connectivity applications.

The AP7335 series belongs to Diodes' precision LDO portfolio, engineered specifically for battery-powered portable electronics demanding ultra-low quiescent current, fast transient response, and small-footprint packaging.

FAQ

What is the minimum input voltage required for AP7335-28SNG-7 to maintain regulation at 300mA?

The minimum input voltage is calculated as VOUT + VDROP = 2.8V + 0.15V = 2.95V. At 300mA load and 25°C, dropout is guaranteed ≤200mV per datasheet (max), so 3.0V input ensures robust regulation across temperature and process variation. Below 2.95V, output voltage will drop below 2.8V.

Can AP7335-28SNG-7 operate without an output capacitor?

No. The device requires a minimum 1μF ceramic output capacitor with ESR >15mΩ for stability. Omitting it causes oscillation and unregulated output. Larger capacitance improves transient response but does not eliminate the mandatory 1μF minimum. Placement within 2mm of OUT/GND pins is critical.

Is the EN pin internally pulled up or down?

The EN pin has no internal pull-up or pull-down resistor. It must be actively driven to ≥1.4V (VIH) for turn-on or ≤0.4V (VIL) for shutdown. Leaving it floating risks undefined operation due to noise coupling; tie to IN via 100kΩ resistor if always-on operation is needed.

How does thermal shutdown behave under sustained overload?

At junction temperature ≥145°C, thermal shutdown disables the pass element. Once junction cools to ~130°C (15°C hysteresis), regulation resumes. Under continuous overload, this causes on/off cycling-visible as output voltage pulsing at ~1–10Hz depending on PCB thermal mass. This protects against permanent damage but indicates inadequate heatsinking or excessive power dissipation.