Diodes Incorporated AP62201WU-7

Overview

AP62201WU-7 from Diodes Incorporated is a 2A synchronous buck converter with 4.2V–18V input range, integrated 90mΩ high-side and 65mΩ low-side MOSFETs, 750kHz switching frequency, and 0.8V ±1% reference voltage. 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 AP62201WU-7 datasheet, AP62201WU-7 pinout, AP62201WU-7 application, or AP62201WU-7 equivalent, key selection criteria include its fixed PWM operation (no PFM mode), 135μA quiescent current only applies to AP62200/AP62200T-not AP62201-and its TSOT26 package's thermal resistance (θJA = 70°C/W) for board-level thermal design validation.

Technical Context

The AP62201WU-7 uses Constant On-Time (COT) control with input-voltage-dependent 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 response. Its internal 0.8V reference is trimmed to ±1% at +25°C and exhibits ±0.016V drift over –40°C to +125°C.

It integrates protection features including cycle-by-cycle valley current limit (2.0–3.5A), thermal shutdown at +160°C with +20°C hysteresis, and undervoltage lockout with 3.6V falling threshold and 3.9–4.15V rising POR. The proprietary gate driver suppresses SW node ringing without extending MOSFET turn-on/turn-off times, directly reducing high-frequency radiated EMI.

Key Specifications

Pinout & Package

AP62201WU-7 is packaged in TSOT26 (Standard), a 6-pin, 1.6mm × 2.9mm, 0.95mm height surface-mount package with exposed thermal pad for enhanced heat dissipation (θJA = 70°C/W, θJB = 12°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP62200WU-7, AP62201WU-7 guarantees consistent PWM operation eliminating PFM-related noise and regulation instability; versus MP2451DT-LF-Z, it trades peak current and frequency for lower IQ, simpler layout, and superior EMI performance in cost-sensitive consumer applications.

Availability

AP62201WU-7 is available at Aetrix Electronics and suitable for FPGA power supplies, consumer audio systems, flat-panel TV logic rails, and gaming console SoC I/O supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for AP62201WU-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 semiconductor company specializing in discrete, analog, and mixed-signal solutions, with manufacturing certified to IATF 16949 and product definitions aligned to AEC-Q200 for industrial and automotive use.

The AP62200/AP62201 series belongs to Diodes' high-efficiency DC-DC converter portfolio, designed specifically for EMI-sensitive consumer and computing applications requiring compact, low-noise, and thermally robust point-of-load regulation.

FAQ

What is the maximum recommended PCB copper weight and pad layout for AP62201WU-7 thermal performance?

The datasheet specifies thermal ratings based on a two-layer FR-4 PCB with 2oz copper and minimum recommended pad layout per JEDEC standards. For optimal θJB = 12°C/W, the exposed thermal pad must be soldered to a solid 2oz internal ground plane with ≥4 thermal vias (0.3mm diameter, spaced ≤1mm apart) connecting to inner layers. Avoid splitting the thermal pad or using solder mask over thermal vias.

Can AP62201WU-7 regulate output voltages below 0.8V using external feedback scaling?

No. The internal reference is fixed at 0.800V ±1%, and the FB pin is designed for resistive divider networks that scale VOUT down to this reference. Attempting to set VOUT < 0.8V violates the guaranteed operating condition and causes regulation failure, as the error amplifier cannot correct errors below its reference threshold. Minimum VOUT is 0.8V.

Does AP62201WU-7 support synchronization to an external clock?

No. AP62201WU-7 uses internal Constant On-Time (COT) control with no external sync pin or frequency adjustment capability. Its switching frequency varies slightly with input/output voltage per t_ON = V_OUT/(V_IN × f_SW) but is not programmable or synchronizable. For sync requirements, consider Diodes' AP6320x family or MPS MP2451.

How does the EN pin's internal 1.5μA pull-up affect startup timing when left floating?

With EN floating, the internal 1.5μA current charges the pin capacitance (including PCB trace and parasitic C) until it reaches the 1.2V logic-high threshold. Startup delay depends on total EN node capacitance: e.g., 100pF yields ~80μs delay, while 1nF extends it to ~800μs. This provides inherent soft-start coordination without external components, but designers must verify timing against system power-on reset requirements.