Diodes Incorporated AP7217A-33SG-13

Overview

AP7217A-33SG-13 from Diodes Incorporated is a 3.3V, 600mA CMOS low-dropout linear regulator in SOP-8L package with active-low open-drain reset output (VDOUT), 50µA typical quiescent current, and guaranteed dropout voltage ≤900mV at full load. It operates from 3.3V–5.5V input and delivers stable power to microprocessor core logic, USB peripherals, and portable audio ICs in space-constrained handheld devices.

For engineers reviewing the AP7217A-33SG-13 datasheet, AP7217A-33SG-13 pinout, AP7217A-33SG-13 application, or AP7217A-33SG-13 equivalent, key selection criteria include its 200ms typ. VDOUT reset delay, thermal shutdown at 150°C, current limit of 750mA, stability with 1µF ceramic output capacitors, and RoHS-compliant green packaging.

Technical Context

The AP7217A integrates a precision bandgap reference, error amplifier, and P-channel MOSFET pass element to achieve low dropout and high accuracy. Its internal voltage divider sets VROUT to 3.300V ±2% over temperature and line variations, with ±100ppm/°C temperature coefficient.

The VDOUT circuit monitors VIN via a dedicated comparator with hysteresis (VDF = 3.3V ±66mV, VHysteresis = 3.366V–3.402V) and asserts an open-drain reset for ≥200ms after regulation is achieved. Enable control (VEN threshold: 1.6V ON / 0.25V OFF) supports system-level power sequencing.

Key Specifications

Pinout & Package

SOP-8L (Small Outline Package, 8-lead, no exposed pad), 4.9mm × 3.9mm × 1.75mm body, 1.27mm lead pitch, RoHS-compliant green molding compound.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP2204-33W5-7 and MCP1700T-3302E/TT, the AP7217A-33SG-13 uniquely combines 600mA delivery, integrated reset signaling, and robust fault protection in a standard SOP-8L footprint-making it optimal for mid-power portable systems requiring reliability and timing coordination.

Availability

AP7217A-33SG-13 is available at Aetrix Electronics and suitable for digital still cameras, hand-held computers, MP3/4 players, and cellular phone baseband subsystems requiring stable component supply, long-term lifecycle support, and RoHS-compliant green packaging.

Supply support for AP7217A-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 high-reliability power management, signal integrity, and protection solutions for consumer, industrial, and automotive markets.

The AP7217A belongs to Diodes' high-accuracy, low-quiescent-current LDO family designed specifically for battery-powered portable electronics where dropout voltage, reset timing, and thermal resilience directly impact user experience and product certification.

FAQ

What is the minimum input voltage required for AP7217A-33SG-13 to maintain 3.3V regulation at 600mA?

The AP7217A-33SG-13 requires VIN ≥ 4.2V to sustain 3.3V output under 600mA load, based on its maximum 900mV dropout voltage specification. At lower input voltages (e.g., 3.8V), output drops below regulation, triggering VDOUT reset assertion. Input must remain ≥3.3V to avoid undervoltage lockout.

Can AP7217A-33SG-13 operate 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 during reset deassertion, causing unreliable microcontroller boot behavior. The datasheet explicitly specifies this requirement in the Typical Application Circuit.

Is the SOP-8L package thermally adequate for continuous 600mA operation at 85°C ambient?

Yes - with proper PCB layout (2oz copper, thermal vias under exposed pad not applicable to SOP-8L), θJA = 134°C/W allows PD(MAX) = (125°C − 85°C)/134°C/W ≈ 300mW. At VIN = 5.3V and VOUT = 3.3V, power dissipation is (2.0V × 0.6A) + (5.3V × 50µA) = 1.23W - exceeding thermal limits. Derating to ≤300mA or using forced airflow is required for full-load operation at 85°C.

Does AP7217A-33SG-13 support reverse-voltage protection on VIN or VROUT?

No - the AP7217A-33SG-13 lacks intrinsic reverse-voltage protection. Applying reverse polarity to VIN or VROUT can damage the internal P-MOSFET and bandgap circuitry. External protection (e.g., series Schottky diode on VIN or back-to-back MOSFETs) must be added if system-level reverse polarity exposure is possible.