Diodes Incorporated AP62301Z6-7

Overview

AP62301Z6-7 from Diodes Incorporated is a 3A synchronous buck converter with 4.2V–18V input range, integrated 75mΩ high-side and 45mΩ low-side MOSFETs, 0.8V ±1% reference voltage, and 750kHz switching frequency. It employs Constant On-Time (COT) control for fast transient response and operates in PWM mode across all load conditions-enabling stable 5V/3.3V point-of-load regulation in FPGA and consumer audio power supplies.

For engineers reviewing the AP62301Z6-7 datasheet, AP62301Z6-7 pinout, AP62301Z6-7 application, or AP62301Z6-7 equivalent, key selection criteria include its fixed PWM operation (no PFM mode), 155μA quiescent current only in AP62300/AP62300T variants, and TSOT26 package-specific thermal resistance (θJA = 70°C/W) critical for compact 12V bus converters.

Technical Context

The AP62301 uses Constant On-Time (COT) control with inverse VIN-proportional on-time calculation (t_ON = V_OUT/(V_IN·f_SW)) and a 220ns minimum off-time to maintain pseudo-fixed frequency and fast load-step recovery. Its proprietary multi-level gate driver suppresses SW node ringing without degrading rise/fall times-directly reducing high-frequency radiated EMI.

It integrates undervoltage lockout (UVLO falling threshold = 3.6V), cycle-by-cycle valley current limit (3.7A typ), output undervoltage protection, and thermal shutdown at +160°C with +20°C hysteresis-enabling robust operation in ambient temperatures from –40°C to +85°C.

Key Specifications

Pinout & Package

AP62301Z6-7 is packaged in TSOT26 (Standard), a 6-pin, 1.7mm × 2.9mm, 0.95mm height surface-mount package with exposed thermal pad (θJA = 70°C/W, θJC = 12°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck converter applications.

Compared with MP2451DT-LF-Z and TPS563201DDCR, AP62301Z6-7 delivers best-in-class EMI reduction via its proprietary gate driver, maintains full 3A capability within its 4.2–18V window, and offers the most thermally efficient TSOT26 implementation for space-constrained 5V/3.3V PoL designs.

Availability

AP62301Z6-7 is available at Aetrix Electronics and suitable for FPGA power supplies, consumer audio DSP rails, flat panel TV 12V bus conversion, and network router point-of-load applications requiring stable component supply, consistent parametric performance, and long-term manufacturability.

Supply support for AP62301Z6-7 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 ICs, specializing in power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.

AP62301Z6-7 belongs to Diodes' AP62xxx family of EMI-optimized synchronous buck converters, designed specifically for noise-sensitive applications like audio, video, and high-speed digital systems where radiated emissions must meet strict regulatory limits.

FAQ

What is the difference between AP62301Z6-7 and AP62300Z6-7?

AP62301Z6-7 operates exclusively in forced PWM mode across all load conditions, while AP62300Z6-7 uses Pulse Frequency Modulation (PFM) at light loads to achieve 155μA quiescent current. AP62301's fixed 750kHz switching ensures predictable EMI behavior and eliminates low-frequency beat tones-critical for audio and video systems. Its feedback reference is identical (0.8V ±1%), but it lacks PFM entry/exit hysteresis circuitry.

Can AP62301Z6-7 be used with an output voltage below 0.8V?

No. The internal reference voltage is fixed at 0.800V ±1%, and the FB pin is designed to regulate VOUT = 0.8V × (1 + R1/R2). Attempting to set VOUT < 0.8V violates the operational specification and results in loss of regulation, as the error amplifier cannot drive the output below the reference threshold. For sub-0.8V rails, select alternatives like TPS563201 (0.6V ref) or MP2315 (0.6V ref).

What is the recommended input capacitor for AP62301Z6-7 at 12V input?

A minimum 10μF X5R/X7R ceramic capacitor placed as close as possible to the VIN and GND pins is required. For optimal EMI suppression and hold-up time, combine it with a 22μF bulk tantalum or polymer capacitor. Total effective capacitance should exceed 30μF with ESL < 1nH; layout must minimize loop area between VIN, GND, and SW to reduce high-frequency ringing.

Does AP62301Z6-7 require an external bootstrap capacitor?

Yes. A ≥100nF ceramic capacitor (X7R, 16V rating) must be placed between BST and SW pins. This capacitor supplies gate drive energy for the high-side MOSFET during each switching cycle. Omitting it causes immediate failure of high-side turn-on, resulting in no output voltage and potential thermal damage. The capacitor must be located within 2mm of the BST/SW pins with short, wide traces.