Diodes Incorporated AP7217-33SG-13

Overview

AP7217-33SG-13 from Diodes Incorporated is a 3.3V, 500mA CMOS low-dropout linear regulator in SOP-8L package, featuring 250mV typical dropout at 100mA, 50μA quiescent current, and active-low open-drain reset output (VDOUT) with 20ms typical delay. It operates from 3.3V–5.5V input and delivers stable voltage for portable digital systems requiring precise power sequencing.

For engineers reviewing the AP7217-33SG-13 datasheet, AP7217-33SG-13 pinout, AP7217-33SG-13 application, or AP7217-33SG-13 equivalent, key selection criteria include guaranteed 500mA load capability, ±0.2% output accuracy at 30mA, VDOUT reset threshold of 3.91V (typ), thermal resistance (θJA = 134°C/W), and compatibility with 1μF ceramic output capacitors without external compensation.

Technical Context

The AP7217-33SG-13 integrates a precision bandgap reference, error amplifier, and current-limit protection circuit to regulate output voltage with ±0.2% line/load regulation. Its enable-controlled startup and VDOUT reset generator provide deterministic power-on sequencing for microprocessor-based systems.

Designed for stability with low-ESR MLCCs or electrolytic capacitors, it uses internal trimming to fix 3.3V output and includes short-circuit protection clamping output current to ~50mA when VROUT falls below 200mV. The SOP-8L package supports compact PCB layouts with thermal pad grounding via Pin 7 (GND).

Key Specifications

Pinout & Package

SOP-8L (Surface-Mount Small Outline Package, 8-lead, gull-wing, green molding compound, RoHS-compliant lead finish). Exposed thermal pad connected to Pin 7 (GND) per recommended layout.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP7215-33SG-13 and MCP1703T-3302E/MB, the AP7217-33SG-13 uniquely combines 500mA output, integrated VDOUT reset, and enable control in SOP-8L - making it optimal for portable systems requiring both high current and deterministic power management.

Availability

AP7217-33SG-13 is available at Aetrix Electronics and suitable for HD/Blu-ray DVD players, smartphones, and digital still cameras requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.

Supply support for AP7217-33SG-13 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 AP7217 belongs to Diodes' high-accuracy, low-noise LDO family designed specifically for portable electronics demanding precise voltage regulation, minimal quiescent power, and integrated power-supervision features.

FAQ

What is the minimum input voltage required for AP7217-33SG-13 to maintain 3.3V output at 500mA?

The AP7217-33SG-13 requires VIN ≥ 3.55V to sustain 3.3V output at 500mA, based on its 250mV typical dropout voltage. At 100mA load, dropout is 100mV (typ), allowing operation down to 3.4V. Absolute minimum VIN is 3.3V, but regulation margin degrades below 3.55V under full load.

Can AP7217-33SG-13 be used without an external pull-up resistor on VDOUT?

No - VDOUT is an open-drain output and requires an external pull-up resistor (typically 100kΩ to VIN) to generate a valid logic-high level. Without it, VDOUT remains floating when inactive, risking undefined reset behavior in downstream logic or microcontrollers.

Is the SOP-8L package thermally enhanced, and how should the thermal pad be handled?

Yes - the SOP-8L package includes an exposed thermal pad electrically connected to Pin 7 (GND). For optimal thermal performance, the pad must be soldered to a dedicated GND copper pour using at least 4 thermal vias (0.3mm diameter) to inner-layer ground planes, per Diodes' AP02001 land pattern recommendation.

Does AP7217-33SG-13 require input and output capacitors, and what types are validated?

Yes - a 1μF ceramic capacitor is required between VIN and GND, and another 1μF ceramic capacitor between VROUT and GND. X5R or X7R dielectrics are validated; the device is stable with ESR ranging from 5mΩ to 1Ω. Larger values improve transient response but are not necessary for basic operation.