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

Diodes Incorporated AP65402SP-13

Name: AP65402SP-13
Brand: Diodes Incorporated
SKU: AP65402SP-13
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP65402SP-13

Manufacturer:: Diodes Incorporated

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 8-SOIC (0.154", 3.90mm Width) Exposed Pad

Datasheet:: AP65402SP-13.pdf

Description:: IC REG BUCK ADJ 4A 8SO

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AP65402SP-13 from Diodes Incorporated is a synchronous DC/DC buck converter with integrated 80 mΩ high-side and 32 mΩ low-side MOSFETs, 500 kHz fixed switching frequency, 4.75–17 V input range, and adjustable 0.8–12 V output delivering up to 4 A continuous current at 96% peak efficiency-used in FPGA/DSP power supplies for stable core voltage regulation.

For engineers reviewing the AP65402SP-13 datasheet, AP65402SP-13 pinout, AP65402SP-13 application, or AP65402SP-13 equivalent, key selection considerations include light-load efficiency algorithm behavior, external compensation network design, EN pin lockout hysteresis (220 mV), and SO-8EP thermal resistance (θJA = 39.2 °C/W).

Technical Context

The AP65402SP-13 implements current-mode control with internal slope compensation to suppress subharmonic oscillation at 250 kHz, enabling fast transient response and stable loop operation across 4.75–17 V input and 0.8–12 V output ranges. Its error amplifier features 800 V/V gain and 1000 µA/V transconductance, referenced to a precise 0.800 V FB threshold.

It integrates an automated light-load efficiency improvement mode that transitions to discontinuous conduction mode below critical load, reducing quiescent current to 0.3 µA in shutdown and 0.3 mA typical in active no-load state. Protection includes cycle-by-cycle OCP (7 A peak HS limit), fold-back frequency shift to 102 kHz under overcurrent, and thermal shutdown at 160 °C with 40 °C hysteresis.

Key Specifications

Parameter	Value and Actual Design Meaning
V_IN Range	4.75 V to 17 V - supports 5 V, 12 V, and 15 V intermediate bus rails without pre-regulation
I_OUT Continuous	4 A - delivers full rated current with ≤96% efficiency at 12 V_IN/3.3 V_OUT
f_SW	500 kHz (±12%) - enables compact LC filter design with 6.5 µH inductor and 72 µF ceramic output cap
R_DS(ON) HS / LS	80 mΩ / 32 mΩ - minimizes conduction loss and thermal rise in SO-8EP package
V_FB Threshold	0.800 V ±0.5% - sets output voltage via resistor divider; enables 1.2 V to 12 V adjustment
Soft-Start Current	6 µA - controls ramp time with external SS capacitor (e.g., 0.1 µF → 13 ms)
Thermal Shutdown	160 °C with 40 °C hysteresis - prevents permanent junction damage during sustained overload

Pinout & Package

AP65402SP-13 is housed in a Green SO-8EP (exposed pad) package compliant with RoHS, halogen-free, and antimony-free standards. The exposed pad (EP) must be soldered to PCB ground plane for optimal thermal performance (θ_JA = 39.2 °C/W).

Pin/Terminal	Circuit Role	Design Meaning
BS (Pin 1)	Bootstrap supply for high-side gate drive	Requires ≥0.01 µF capacitor from SW to BS to sustain 100% duty cycle capability
IN (Pin 2)	Main power input	Supplies IC bias and switch power; bypass with ≥44 µF ceramic capacitor near pin
SW (Pin 3)	Switching node	Connects to inductor input; carries high di/dt; requires low-inductance layout to SW–BS cap
GND (Pin 4)	Power and signal reference	Common return for IN, FB, COMP, EN, SS; tied to EP for thermal path
FB (Pin 5)	Output voltage feedback	Senses resistive divider; regulated to 0.800 V; bias current <100 nA
COMP (Pin 6)	Loop compensation node	Output of transconductance error amplifier; connects RC network to GND for stability
EN (Pin 7)	Enable control input	Active-high logic; 0.7–1.2 V rising threshold; 2.2–2.7 V lockout with 220 mV hysteresis
SS (Pin 8)	Soft-start timing control	6 µA internal current source charges external capacitor; floating disables soft-start

Key Features

Feature	Design Value
Integrated Power Stage	Monolithic 80 mΩ HS + 32 mΩ LS MOSFETs eliminate external switch selection and layout complexity
Light-Load Efficiency Mode	Automatically enters DCM below ~0.5 A load, reducing IQ to <1 mA and improving no-load efficiency
External Compensation	COMP pin allows full control of loop bandwidth and phase margin using R3/C3 network
Robust Protection Suite	Hiccup-mode OCP, UVLO (4.05 V rising), OVLO (1.0 V FB threshold), and thermal shutdown with hysteresis
Green Packaging	SO-8EP meets RoHS, halogen-free (<900 ppm Br/Cl), and antimony-free (<1000 ppm) requirements

Applications

Gaming Console Core Power

FPGA I/O Bank Supply

Use Scenario: Powers GPU voltage rails in portable gaming consoles requiring tight transient response and low standby power.

IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering 1.2 V @ 4 A to GPU cores with <10 µs load-step recovery.

Use Value: Light-load efficiency mode reduces system idle power by >40% versus standard PWM controllers.

Use Scenario: Supplies configurable I/O banks on Xilinx Artix-7 FPGAs where voltage flexibility and sequencing matter.

IC Role / Device Role / Timing Role: Adjustable-output buck converter set to 1.8 V or 2.5 V; EN pin enables power sequencing with host controller.

Use Value: 0.800 V FB reference and external resistor divider allow precise, stable I/O rail tuning without trimming.

Set-Top Box SoC Core Rail

Network Switch ASIC Supply

Use Scenario: Generates 1.0 V core voltage for ARM-based media processors in STB platforms operating at -40°C to +85°C.

IC Role / Device Role / Timing Role: Main SoC power stage with thermal shutdown and UVLO ensuring reliable startup under brownout conditions.

Use Value: SO-8EP package with θ_JA = 39.2 °C/W sustains 4 A continuous output without heatsink in confined chassis.

Use Scenario: Powers 12 nm Ethernet switch ASICs requiring clean, low-noise 0.85 V supply with fast load-step response.

IC Role / Device Role / Timing Role: High-efficiency buck converter with current-mode control and slope compensation for <500 ns transient recovery.

Use Value: 500 kHz switching frequency enables use of small 4.7 µH inductors while maintaining EMI compliance.

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	4.5–24 V input, 3 A output, 500 kHz, no integrated bootstrap cap requirement	Lacks automated light-load mode; higher IQ (25 µA shutdown) and lower max current	Preferred when wider VIN range needed but 3 A suffices and light-load efficiency is secondary
TPS54332DR	3.5–28 V input, 3.5 A output, adjustable frequency (200–1200 kHz), external MOSFETs	Requires discrete high/low-side FETs and more external components; no integrated power stage	Chosen when design requires frequency synchronization or >17 V input beyond AP65402SP-13's rating

Compared with MP2315DJ-LF-Z and TPS54332DR, the AP65402SP-13 offers higher integration (monolithic 4 A stage), superior light-load efficiency automation, and optimized SO-8EP thermal performance-making it ideal for space-constrained, thermally sensitive 12 V input systems needing 4 A at <1.2 V.

Availability

AP65402SP-13 is available at Aetrix Electronics and suitable for gaming console power delivery, FPGA I/O bank regulation, and set-top box SoC core rails requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for AP65402SP-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 high-efficiency power management, signal integrity, and protection solutions for consumer, industrial, and computing markets.

The AP65402SP-13 belongs to Diodes' AP65xxx family of synchronous buck converters designed for compact, high-current point-of-load applications in space-constrained consumer and networking equipment.

FAQ

What is the minimum recommended input capacitance for AP65402SP-13?

The datasheet specifies a 44 µF ceramic input capacitor as sufficient for most applications. This value ensures RMS current handling exceeds half the 4 A maximum load current and maintains low ESR to suppress switching noise and surge currents at the IN pin. Layout must minimize trace inductance between IN and the capacitor.

Can AP65402SP-13 operate with 3.3 V input?

No. The absolute minimum input voltage is 4.75 V per the Recommended Operating Conditions table, and the UVLO rising threshold is 4.05 V. Operation below 4.75 V violates specification and risks unstable regulation or failure to start. A pre-regulator is required for 3.3 V input systems.

How does the light-load efficiency improvement algorithm function?

The algorithm automatically detects output current magnitude and transitions from continuous PWM mode to discontinuous conduction mode (DCM) below a critical load (~0.4–0.6 A). In DCM, switching frequency drops and gate drive is optimized to reduce switching and gate charge losses, lowering quiescent current to sub-mA levels without external control.

Is the SO-8EP exposed pad electrically isolated?

No. The exposed pad (EP) is internally connected to GND and must be soldered to a PCB ground plane. It serves both thermal dissipation (reducing θ_JA from 60+ to 39.2 °C/W) and electrical grounding-floating or insulated mounting degrades thermal performance and may cause instability or overtemperature shutdown.

AP65402SP-13 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width) 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):: 4.75V

Voltage - Input (Max):: 17V

Voltage - Output (Min/Fixed):: 0.8V

Voltage - Output (Max):: 12V

Current - Output:: 4A

Frequency - Switching:: 500kHz

Synchronous Rectifier:: Yes

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SO-EP

AP65402SP-13 FAQ

1.How can I place an order for AP65402SP-13 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP65402SP-13 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 AP65402SP-13 reliable?

The price and inventory of AP65402SP-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP65402SP-13 is usually 5 days.

3.What payment methods are accepted for AP65402SP-13?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP65402SP-13 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP65402SP-13?

AP65402SP-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP65402SP-13 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 AP65402SP-13?

For technical support, including AP65402SP-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP65402SP-13 requirements.

6.How does Aetrix verify that AP65402SP-13 is sourced from the original manufacturer or authorized distributors?

All AP65402SP-13 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 AP65402SP-13 meets industry standards.

7.What is the process for return or replacement of AP65402SP-13?

All AP65402SP-13 units undergo pre-shipment inspection (PSI). If there is an issue with AP65402SP-13, 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 AP65402SP-13 part is unused and in its original packaging.

Return procedure for AP65402SP-13:

1.Submit a request within 90 days.

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

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