Diodes Incorporated AP7583Q-50D4-13

Overview

AP7583Q-50D4-13 from Diodes Incorporated is a 5.0V fixed-output, 300mA ultra-low-dropout (ULDO) regulator for automotive battery-powered systems. It features 2.5µA quiescent current at light loads, 320mV dropout at 300mA output, ±1.5% output voltage accuracy, and AEC-Q100 qualification. It powers always-on subsystems such as CAN transceivers in body control modules.

For engineers reviewing the AP7583Q-50D4-13 datasheet, AP7583Q-50D4-13 pinout, AP7583Q-50D4-13 application, or AP7583Q-50D4-13 equivalent, key selection criteria include wide 3V–42V input range, thermal shutdown behavior, PG absence (vs. AP7583AQ), TO252-4 thermal performance, and compatibility with low-ESR ceramic capacitors.

Technical Context

The AP7583Q-50D4-13 integrates a precision 1.2V reference, error amplifier, and current-limit circuit to regulate output under varying line/load conditions. Its internal gate driver supports stable operation with 10µF input/output ceramic capacitors and maintains regulation down to zero load.

It implements undervoltage lockout (UVLO) with 2.4V turn-on threshold and 0.2V hysteresis, thermal shutdown at +175°C with +20°C hysteresis, and short-circuit protection via foldback current limiting. The TO252-4 package delivers θJA = 27.2°C/W, enabling 300mA operation at elevated ambient temperatures when properly heatsinked.

Key Specifications

Pinout & Package

AP7583Q-50D4-13 uses the TO252-4 (Type C) surface-mount package with exposed thermal pad. PCB layout requires large copper area connected to GND under the EP for optimal heat transfer; the EP is not electrically functional as GND but improves thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP7583AQ-50D4-13, this part trades PG functionality for 0.5µA lower IQ and simpler enable-only control; versus TLD1120-5V, it delivers 80mV lower dropout and 1µA lower IQ in a pin-compatible TO252-4 footprint.

Availability

AP7583Q-50D4-13 is available at Aetrix Electronics and suitable for automotive body electronics, EV battery management, and infotainment systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AP7583Q-50D4-13 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 semiconductor company specializing in discrete, analog, and mixed-signal solutions for automotive, industrial, and consumer markets, with manufacturing certified to IATF16949.

The AP7583Q/AQ series belongs to Diodes' automotive-grade power management portfolio, designed specifically to meet stringent AEC-Q100 requirements for battery-powered ECUs in harsh vehicular environments.

FAQ

What is the minimum input voltage required for regulation at 5.0V output?

The AP7583Q-50D4-13 requires VIN ≥ VOUT + VDROP to maintain regulation. With typical dropout of 320mV at 300mA, minimum VIN is 5.32V. At lighter loads, dropout decreases-e.g., ~150mV at 10mA-allowing regulation down to ~5.15V. UVLO releases at 2.4V, but regulation only begins once VIN exceeds VOUT + actual dropout.

Can the EN pin be left floating?

No. The EN pin must be actively driven or hard-wired: connect to VIN for permanent enable, or to a clean logic signal meeting VIH ≥1.7V and VIL ≤0.3V. Floating EN risks partial turn-on, increased leakage, or erratic startup due to noise coupling-especially in automotive EMI environments.

Is an external capacitor required on the FB/NC pin?

No. The AP7583Q-50D4-13 is a fixed-output variant; the FB/NC pin is internally connected and unused. Per datasheet Pin Descriptions, it is "NC" (not connected) and should be left unconnected or tied to GND for thermal enhancement-no external components are needed or permitted on this pin.

How does thermal performance differ between TO252-4 and MSOP-8EP packages?

TO252-4 delivers θJA = 27.2°C/W, enabling ~2.2W max power dissipation at 85°C ambient before thermal shutdown. MSOP-8EP has θJA = 36.1°C/W-reducing usable power by ~25%. The TO252-4's larger thermal pad and lower resistance make it preferred for 300mA continuous operation in high-ambient environments like engine bays or under-dash locations.