Diodes Incorporated AP7335-28WG-7

Overview

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

For engineers reviewing the AP7335-28WG-7 datasheet, AP7335-28WG-7 pinout, AP7335-28WG-7 application, or AP7335-28WG-7 equivalent, key selection criteria include its ultra-low IQ for standby efficiency, compatibility with 1μF ceramic output capacitors, SOT25 package footprint, fixed 2.8V output for baseband or RF bias rails, and robust fault protection under short-circuit or thermal overload conditions.

Technical Context

The AP7335-28WG-7 implements a PMOS pass transistor architecture enabling low dropout (150mV @ 300mA) and high PSRR (65dB @ 1kHz) without requiring external compensation. Its bandgap reference and error amplifier deliver ±2% output accuracy across –40°C to +85°C ambient.

Enable logic operates with VIH ≥ 1.4V and VIL ≤ 0.4V, supporting direct interface with 1.8V/3.3V GPIOs. Internal current limit (~600mA) and thermal shutdown (~145°C with 15°C hysteresis) operate independently of external components, ensuring fail-safe behavior in fault conditions.

Key Specifications

Pinout & Package

SOT25 package (2.9mm × 2.8mm × 1.3mm), RoHS-compliant, green molding compound, with exposed pad not electrically connected.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700T-2802E/TT and XC6206P282MR-G, the AP7335-28WG-7 uniquely balances 300mA delivery, 150mV dropout, and 35μA IQ-making it optimal for portable systems needing both high current headroom and extended battery life across full battery discharge.

Availability

AP7335-28WG-7 is available at Aetrix Electronics and suitable for smartphone baseband power, Bluetooth audio SoC bias, and wearable sensor hub applications requiring stable component supply, consistent parametric performance, and long-term industrial availability.

Supply support for AP7335-28WG-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 protection solutions for consumer, industrial, and automotive markets.

The AP7335 series belongs to Diodes' low-quiescent-current LDO portfolio, designed specifically for battery-powered portable electronics demanding high efficiency, small size, and robust fault tolerance in space- and energy-constrained environments.

FAQ

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

The AP7335-28WG-7 requires VIN ≥ 2.95V to sustain 2.8V output at 300mA, based on its 150mV dropout specification. Below this threshold, output voltage drops linearly with input; operation below 2.0V is prohibited per absolute maximum ratings. Input must also stay within 2.0–6.0V recommended range for reliable performance.

Can AP7335-28WG-7 be used without an output capacitor?

No. The AP7335-28WG-7 requires a minimum 1μF ceramic output capacitor with ESR >15mΩ for stability and transient response. Omitting it causes oscillation, excessive overshoot/undershoot during load steps, and potential thermal shutdown. The capacitor must be placed directly between OUT and GND pins with minimal trace length.

How does the EN pin behave during power-up and what logic levels are valid?

The EN pin is active-high with VIH ≥ 1.4V and VIL ≤ 0.4V. During power-up, the device remains off until EN rises above 1.4V; no internal pull-up exists, so EN must be actively driven or tied to VIN. Pulling EN below 0.4V shuts down the LDO, reducing input current to 0.1–1μA (ISHDN).

Is AP7335-28WG-7 compatible with ceramic capacitors having ESR below 15mΩ?

No. Ceramic capacitors with ESR <15mΩ may cause instability and ringing due to insufficient phase margin. If low-ESR ceramics are used, a 15–50mΩ damping resistor must be added in series with the output capacitor. Alternatively, select X5R/X7R dielectrics with inherent ESR ≥15mΩ or add a parallel RC network per Diodes Application Note AN-3001.