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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

Diodes Incorporated AP65550FN-7

Name: AP65550FN-7
Brand: Diodes Incorporated
SKU: AP65550FN-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP65550FN-7

Manufacturer:: Diodes Incorporated

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 10-UFDFN Exposed Pad

Datasheet:: AP65550FN-7.pdf

Description:: IC REG BUCK ADJ 5A UDFN303010

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Product details

Overview

AP65550FN-7 from Diodes Incorporated is a synchronous step-down DC-DC converter IC with adaptive constant-on-time (aCOT) control, delivering 5A continuous output current across 4.5V–18V input and 0.765V–6V adjustable output. It integrates 65mΩ high-side and 36mΩ low-side MOSFETs, operates at 650kHz pseudo-fixed frequency, and supports seamless CCM/DCM transition for high light-load efficiency in flat-panel TV and monitor power rails.

For engineers reviewing the AP65550FN-7 datasheet, AP65550FN-7 pinout, AP65550FN-7 application, or AP65550FN-7 equivalent, key selection criteria include its adaptive on-time timing architecture, dual-mode conduction support, programmable soft-start via external capacitor, thermal shutdown at +160°C, and compatibility with ultra-low-ESR ceramic and polymer capacitors.

Technical Context

The AP65550FN-7 implements an adaptive constant-on-time (aCOT) control scheme where on-time is dynamically calculated per cycle as t_ON ∝ V_OUT/V_IN, enabling pseudo-constant 650kHz switching without an internal oscillator. Its digital control logic includes valley-current overcurrent protection with temperature-compensated trip threshold (4ppm/°C) and non-latching UVLO with 3.45V turn-on and 320mV hysteresis.

It features integrated power switches with matched R_DS(ON) (65mΩ HS / 36mΩ LS), pre-biased startup capability, and a dedicated VREG5 5V LDO output (4.7–5.5V, 110mA source) for gate drive and biasing. The device transitions automatically between CCM and DCM based on inductor current zero-crossing detection, maintaining >90% efficiency at 10mA load.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	4.5V to 18V - Supports wide-input industrial and consumer DC supplies including 12V bus and 5V/3.3V derived rails.
Output Current	5A continuous - Sustains full-rated load without derating up to +85°C ambient with proper PCB thermal layout.
Switching Frequency	650kHz pseudo-fixed - Enables compact LC filter design with 1.5μH inductor and <100μF total output capacitance.
Feedback Reference	0.765V ±12mV - Enables precise low-voltage regulation (e.g., 1.05V @ ±1.2%) for FPGA core supplies.
HS/LS R_DS(ON)	65mΩ / 36mΩ - Minimizes conduction loss; achieves >92% peak efficiency at 12V_IN/1.05V_OUT/3A.
Thermal Shutdown	+160°C with +30°C hysteresis - Protects die during overload; auto-recovery at +130°C junction temperature.
Soft-Start Control	Programmable via external capacitor - Sets ramp time (e.g., 2.2nF → ~1.4ms); prevents inrush into downstream loads.

Pinout & Package

AP65550FN-7 is packaged in U-DFN3030-10 (3.0mm × 3.0mm, 0.5mm pitch) with exposed thermal pad (Pin 11 = PGND). The package enables high-power density and low thermal resistance (θ_JA = 42°C/W).

Pin/Terminal	Circuit Role	Design Meaning
EN (Pin 1)	Enable control input	Digital logic-level input; ≥1.9V enables regulator; internal 100kΩ pull-up to VIN enables auto-start.
FB (Pin 2)	Feedback sensing node	Connects to resistor divider; regulates output by comparing against 0.765V internal reference.
VREG5 (Pin 3)	Bias LDO output	Supplies 5V (4.7–5.5V) for internal logic and bootstrap circuit; requires 1μF local decoupling to PGND.
SS (Pin 5)	Soft-start timing node	Charged by 6μA internal current source; external capacitor sets output voltage ramp time.
GND (Pin 6)	Analog ground reference	Reference for FB, SS, EN; must be separated from PGND in sensitive analog layout.
SW (Pins 7,8)	Power switching node	Drives external LC filter; connects to BST capacitor and inductor; carries high di/dt switching current.
BST (Pin 4)	Bootstrap supply	Requires 0.1μF capacitor to SW; generates gate drive voltage for high-side NMOS switch.
VIN (Pins 9,10)	Main power input	Accepts 4.5–18V; requires bulk input capacitor (≥10μF ceramic) close to VIN and PGND.
PGND (Pin 11, Exposed Pad)	Power ground return	Primary return path for HS/LS MOSFETs and inductor; must connect to large copper pour for thermal and EMI performance.

Key Features

Feature	Design Value
Adaptive Constant-On-Time Control	Enables stable loop response with any output capacitor ESR (including 0Ω ceramic), eliminating need for external compensation.
Synchronous Rectification	Integrated 65mΩ/36mΩ MOSFETs eliminate external diode losses, improving efficiency by 5–8% vs. asynchronous designs.
CCM/DCM Seamless Transition	Automatic mode switching maintains >85% efficiency from 10mA to 5A load, critical for dynamic display backlight power.
Pre-Biased Startup	Allows safe power-up into pre-charged output rail (e.g., hot-swap systems), preventing reverse current flow.
Temperature-Compensated OCP	4ppm/°C V_LIMIT tracking offsets R_DS(ON) drift, ensuring consistent current limit across -40°C to +125°C junction range.

Applications

Flat Panel TV Power Rails

FPGA Core Supply

Use Scenario: Regulating 1.05V/3A for SoC and GPU cores in 4K UHD television mainboards.

IC Role / Device Role / Timing Role: Primary point-of-load (POL) buck converter with fast transient response to handle burst-mode video processing loads.

Use Value: 650kHz switching and 150ns minimum on-time enable tight output regulation (<±15mV ripple) during 10A/μs load steps.

Use Scenario: Delivering 1.2V/4A to Xilinx Artix-7 FPGA banks with strict sequencing and soft-start requirements.

IC Role / Device Role / Timing Role: Configurable core voltage regulator with programmable soft-start and pre-biased startup for multi-rail power sequencing.

Use Value: External resistor divider (R1=12.7kΩ/R2=22.1kΩ) sets exact 1.2V output; SS pin ensures monotonic ramp without undershoot.

Set-Top Box SoC Supply

Network Router CPU Core

Use Scenario: Generating 1.1V/2.5A for Broadcom BCM72xx media processors in streaming devices.

IC Role / Device Role / Timing Role: High-efficiency intermediate bus converter operating from 12V input to low-voltage processor domain.

Use Value: DCM operation at standby (10mA) sustains >87% efficiency, reducing no-load power consumption below 15mW.

Use Scenario: Powering ARM Cortex-A53 CPU cores (1.35V/3A) in enterprise-grade Wi-Fi 6 routers.

IC Role / Device Role / Timing Role: Thermally robust POL regulator mounted near CPU package with direct PGND thermal pad connection.

Use Value: θ_JC = 6°C/W and exposed PGND pad enable full 5A operation at +85°C ambient without forced air cooling.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MP2315DJ-LF-Z (Monolithic Power)	Fixed 500kHz frequency; 3.5A rated; no VREG5 LDO; requires external bootstrap diode.	Lacks integrated VREG5 and adaptive timing - less suitable for ultra-low-ESR ceramic output caps.	Select when lower cost and fixed-frequency EMI profile are prioritized over light-load efficiency.
TPS54560BQDDARQ1 (TI)	Adjustable frequency (100kHz–2.5MHz); 5A; integrated BOOT diode; no VREG5 output.	Higher quiescent current (146μA vs. 900μA); lacks pre-biased startup and CCM/DCM auto-transition.	Choose for automotive AEC-Q100 compliance and wider frequency tuning, not for consumer display applications.

Compared with MP2315DJ-LF-Z and TPS54560BQDDARQ1, AP65550FN-7 uniquely combines adaptive timing, integrated VREG5, pre-biased startup, and seamless CCM/DCM - making it optimal for space-constrained, high-transient consumer electronics where output capacitor flexibility and light-load efficiency are critical.

Availability

AP65550FN-7 is available at Aetrix Electronics and suitable for flat-panel TV power rails, FPGA core supplies, set-top box SoC regulation, and network router CPU core applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for AP65550FN-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 power management ICs, specializing in high-efficiency, thermally optimized solutions for consumer, industrial, and computing markets.

The AP65550 belongs to Diodes' high-current synchronous buck converter product line, designed specifically for low-voltage, high-transient power delivery in digital TVs, monitors, and multimedia SoC platforms.

FAQ

What is the recommended output capacitor type and minimum value for AP65550FN-7?

The AP65550FN-7 supports ultra-low-ESR ceramic capacitors (X5R/X7R) and polymer capacitors (SP-CAP/POSCAP). Minimum recommended output capacitance is 22μF (e.g., two 10μF + one 2.2μF ceramics in parallel), with ESR ≤5mΩ. Ceramic-only designs require careful attention to microphonic effects and DC bias derating.

How does the adaptive on-time control affect EMI performance compared to fixed-frequency controllers?

Adaptive on-time produces slight frequency variation (±5% around 650kHz) under load and input changes, spreading spectral energy and reducing peak EMI amplitude. Unlike fixed-frequency controllers, it avoids subharmonic oscillation and eliminates need for external compensation networks that can resonate with layout parasitics.

Can AP65550FN-7 operate with an input voltage below 4.5V?

No - the absolute minimum input voltage is 4.5V per recommended operating conditions. Below this, UVLO disables the device at 3.45V (with 320mV hysteresis), and internal gate drive voltage becomes insufficient to fully enhance the 65mΩ high-side MOSFET, risking shoot-through and thermal runaway.

What is the function of the VREG5 pin, and is it required to be decoupled?

VREG5 provides a regulated 5V output (4.7–5.5V) powering internal logic and the high-side gate driver. It must be decoupled with a 1μF X5R ceramic capacitor placed within 2mm of VREG5 and PGND pins. Omitting this capacitor causes unstable switching, erratic soft-start, and potential BST undercharge leading to HS FET failure.

AP65550FN-7 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 10-UFDFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Function:: Step-Down

Output Configuration:: Positive

Topology:: Buck

Output Type:: Adjustable

Number of Outputs:: 1

Voltage - Input (Min):: 4.5V

Voltage - Input (Max):: 18V

Voltage - Output (Min/Fixed):: 0.76V

Voltage - Output (Max):: 6V

Current - Output:: 5A

Frequency - Switching:: 650kHz

Synchronous Rectifier:: Yes

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: U-DFN3030-10

AP65550FN-7 FAQ

1.How can I place an order for AP65550FN-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP65550FN-7 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for AP65550FN-7 reliable?

The price and inventory of AP65550FN-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP65550FN-7 is usually 5 days.

3.What payment methods are accepted for AP65550FN-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP65550FN-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP65550FN-7?

AP65550FN-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP65550FN-7 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for AP65550FN-7?

For technical support, including AP65550FN-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP65550FN-7 requirements.

6.How does Aetrix verify that AP65550FN-7 is sourced from the original manufacturer or authorized distributors?

All AP65550FN-7 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AP65550FN-7 meets industry standards.

7.What is the process for return or replacement of AP65550FN-7?

All AP65550FN-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP65550FN-7, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The AP65550FN-7 part is unused and in its original packaging.

Return procedure for AP65550FN-7:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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