Diodes Incorporated AP1501-12K5L-13

Overview

AP1501-12K5L-13 from Diodes Incorporated is a fixed 12V, 3A non-synchronous PWM buck DC/DC converter in TO263-5L package, operating at 150kHz switching frequency with ±4% output voltage tolerance and integrated thermal shutdown/current limit protection. It accepts 15–40V input and delivers regulated 12V output for industrial power rails and embedded system supplies.

For engineers reviewing the AP1501-12K5L-13 datasheet, AP1501-12K5L-13 pinout, AP1501-12K5L-13 application, or AP1501-12K5L-13 equivalent, key selection criteria include its fixed 12V output, 3A load capability, TO263-5L thermal performance (θJA = 37°C/W), shutdown control via SD pin, and internal compensation eliminating external loop components.

Technical Context

The AP1501-12K5L-13 implements voltage-mode PWM control with an internal 150kHz oscillator (±15% tolerance) and built-in 3A N-channel DMOS switch. Its feedback loop references a 1.23V internal bandgap and uses the FB pin to monitor output voltage through resistive divider-though this is bypassed in fixed-output versions where regulation is hardwired.

Thermal shutdown activates at TJ ≥ 150°C and current limit triggers at 3.6–5.5A peak switch current. The SD pin provides logic-level ON/OFF control with VIL ≤ 1.3V (ON) and VIH ≥ 2.0V (OFF), enabling low-quiescent standby mode (ISTBY = 150–350µA).

Key Specifications

Pinout & Package

AP1501-12K5L-13 is housed in a lead-free, RoHS-compliant TO263-5L surface-mount package with exposed metal tab electrically connected to GND for thermal conduction into PCB copper. The 5-pin top-view layout supports high-current routing and efficient heat dissipation without external heatsink under moderate loads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM2576HVS-12 and MP1584EN-LF-Z, the AP1501-12K5L-13 offers fixed 12V output with no external resistor network, TO263-5L thermal performance superior to SOIC alternatives, and integrated current limit-making it optimal for space-constrained industrial 12V rails requiring minimal external components and robust fault handling.

Availability

AP1501-12K5L-13 is available at Aetrix Electronics and suitable for industrial PLC power supplies, telecom line card biasing, and automotive body control modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for AP1501-12K5L-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 industrial, computing, and consumer markets.

The AP1501 product line delivers cost-optimized, fully integrated buck converters targeting high-current, fixed-output applications where simplicity, thermal reliability, and minimal external components are critical.

FAQ

What is the minimum input voltage required for AP1501-12K5L-13 to regulate 12V output?

The AP1501-12K5L-13 requires a minimum input voltage of 15V to maintain regulation at full 3A load, per its recommended operating conditions. Below 15V, duty cycle approaches 100% and dropout occurs-verified by test data showing stable 12V output only above 15V across the full temperature range.

Can the AP1501-12K5L-13 be used in adjustable-output configurations?

No-the AP1501-12K5L-13 is a factory-trimmed fixed 12V version; its FB pin is internally connected to the 12V reference network and not accessible for external resistor programming. Only AP1501-ADJK5L-13 supports adjustable output via external R1/R2 divider.

Does the TO263-5L package require a heatsink for 3A operation?

Not necessarily-the TO263-5L's thermal resistance is θJA = 37°C/W with 3in² of 1oz copper. At 3A and 24V input, power dissipation is ~3.6W; junction rise is ~133°C above ambient. With TA ≤ 40°C, TJ stays below 150°C shutdown threshold-so adequate PCB copper replaces discrete heatsinks in most cases.

What diode is recommended for use with AP1501-12K5L-13?

Diodes Incorporated specifies the B340A Schottky diode (40V, 3A, 0.45V VF) or PDS340 series as the preferred catch diode. Its low forward voltage and fast recovery minimize conduction loss and reverse recovery noise, directly supporting the AP1501's 150kHz switching and efficiency targets.