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

Diodes Incorporated AP65503SP-13

Name: AP65503SP-13
Brand: Diodes Incorporated
SKU: AP65503SP-13
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP65503SP-13

Manufacturer:: Diodes Incorporated

Category:: Voltage Regulators - DC DC Switching Regulators

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

Datasheet:: AP65503SP-13.pdf

Description:: IC REG BUCK ADJ 5A 8SO

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AP65503SP-13 from Diodes Incorporated is a 750kHz synchronous DC/DC buck converter with integrated high- and low-side MOSFETs (R_DS(ON) = 80 mΩ / 32 mΩ), delivering up to 5A continuous output current at up to 96% efficiency, featuring automated light-load efficiency improvement and adjustable output voltage from 2.5V to 12V - deployed in FPGA/DSP power supplies and flat-panel TV main rails.

For engineers reviewing the AP65503SP-13 datasheet, AP65503SP-13 pinout, AP65503SP-13 application, or AP65503SP-13 equivalent, key selection considerations include VIN range (4.75–17V), external compensation via COMP pin, thermal shutdown at 160°C, and SO-8EP package thermal resistance (θ_JA = 43°C/W).

Technical Context

The AP65503SP-13 implements current-mode control with internal slope compensation to prevent subharmonic oscillation at half-switching frequency (375kHz), enabling fast transient response and stable loop design across wide load ranges. Its error amplifier (G_EA = 1000 µA/V, A_VEA = 800 V/V) interfaces directly with the COMP node for external RC-based pole-zero placement.

It integrates dual N-channel MOSFETs with cycle-by-cycle overcurrent protection: high-side current limit set at 7A peak, low-side at 0.9A, with fold-back frequency reduction to 102kHz upon FB drop to 0.3V. EN pin features 0.7–1.2V rising threshold and 220mV hysteresis for reliable UVLO-latched startup control.

Key Specifications

Parameter	Value and Actual Design Meaning
VIN Range	4.75V to 17V - supports 5V, 12V, and 15V intermediate bus architectures without pre-regulation.
Output Current	5A continuous, 7A peak - sustains full load under 85°C ambient with SO-8EP thermal pad grounding.
Switching Frequency	750kHz (±12%) - enables compact 4.7µH inductors and ceramic input/output capacitors (44µF/72µF typical).
Feedback Voltage	0.800V ±0% - sets output via resistor divider; 20% OVP threshold triggers immediate COMP/SS discharge.
Light-Load Mode	Automated entry below critical load - reduces quiescent current to 0.3µA shutdown and improves no-load efficiency.
Thermal Protection	160°C shutdown with 40°C hysteresis - disables HS switch and forces soft-start restart at ~120°C junction.
Enable Threshold	0.7–1.2V rising, 2.2–2.7V lockout - ensures clean startup sequencing and noise-immune disable behavior.

Pinout & Package

AP65503SP-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 thermal and electrical performance.

Pin/Terminal	Circuit Role	Design Meaning
BS (Pin 1)	Bootstrap supply for high-side gate drive	Requires ≥0.01µF capacitor from SW to BS; enables full enhancement of integrated 80mΩ HS MOSFET.
IN (Pin 2)	Main power input	Accepts 4.75–17V; bypassed with ≥44µF ceramic capacitor to suppress switching ripple and EMI.
SW (Pin 3)	Switching node	Connects to inductor input; carries high di/dt; requires tight layout to minimize parasitic inductance.
GND (Pin 4)	Power and signal reference	Common return for IN, FB, COMP, EN, SS; tied to EP for optimal thermal path.
FB (Pin 5)	Output voltage sensing	Monitors resistive divider; 0.800V reference enables precise VOUT adjustment from 2.5V–12V.
COMP (Pin 6)	Error amplifier output	External RC network (e.g., 10.5kΩ + 6.8nF) sets loop stability and phase margin.
EN (Pin 7)	Logic-level enable control	Pull high ≥2.2V to activate; pull ≤1.98V to disable; 100kΩ pull-up enables auto-start.
SS (Pin 8)	Soft-start timing control	0.1µF to GND yields 13ms ramp; floating disables soft-start; reset on UVLO/thermal fault.

Key Features

Feature	Design Value
Integrated Power Stage	Co-packaged 80mΩ HS / 32mΩ LS MOSFETs eliminate external driver and reduce BOM count by ≥4 components.
Light-Load Efficiency Algorithm	Automatically transitions to discontinuous conduction mode below ~1A, reducing IQ to <1.5mA and improving 10mA efficiency by >15%.
Robust Protection Suite	Combines hiccup-mode OCP, 160°C thermal shutdown with 40°C hysteresis, 4.05V UVLO, and 1.0V FB overvoltage clamp.
Flexible Output Programming	VOUT adjustable from 2.5V to 12V using two-resistor feedback network; R2 fixed at 10kΩ per datasheet table.
SO-8EP Thermal Performance	θ_JA = 43°C/W (2s2p FR-4); θ_JC = 6.3°C/W - enables 5A operation without heatsink at 85°C ambient.

Applications

Gaming Console Core Power

FPGA/DSP Point-of-Load Supply

Use Scenario: Powers GPU and CPU cores in compact gaming consoles requiring stable 1.2V/3.3V rails under dynamic 0–5A loads.

IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering regulated core voltage with <100ns transient response.

Use Value: Integrated MOSFETs and 750kHz switching minimize board area; light-load algorithm extends battery life during menu/idle states.

Use Scenario: Supplies configurable logic and digital signal processors in embedded vision or telecom systems with tight voltage tolerance (±1%).

IC Role / Device Role / Timing Role: Precision-adjustable POL converter with 0.800V FB reference and external compensation for system-specific loop tuning.

Use Value: COMP pin accessibility allows optimization for FPGA current slew rates; thermal shutdown prevents damage during configuration bursts.

Flat Panel TV Main Rail

Network System Mid-Board Supply

Use Scenario: Generates 5V/12V rails for display logic, TCON, and audio amplifiers in 4K UHD TVs operating continuously at 40–85°C ambient.

IC Role / Device Role / Timing Role: High-efficiency primary DC/DC stage replacing discrete controllers and external FETs.

Use Value: 96% peak efficiency and SO-8EP thermal pad sustain 5A load without derating; RoHS/Green compliance meets regional eco-standards.

Use Scenario: Provides isolated 3.3V/5V power to packet processing ASICs and PHY interfaces in enterprise switches and routers.

IC Role / Device Role / Timing Role: Distributed buck converter supporting hot-swap and inrush control via EN and SS pins.

Use Value: Soft-start programmability (via SS capacitor) limits inrush into large mid-board capacitance; EN hysteresis rejects supply noise during line transients.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MP2359DJ-LF-Z (Monolithic Power)	4.5–24V input, 3A output, 500kHz fSW, no light-load algorithm	Lacks automated efficiency optimization below 0.5A; lower current rating limits use in 5A FPGA rails	Select when input voltage exceeds 17V or board space permits larger inductor for lower fSW.
TPS54560BQDDAQ1 (TI)	3.5–60V input, 5A output, 100–2500kHz adjustable fSW, integrated boot diode	Wider VIN range adds complexity; no integrated LS FET - requires external sync rectifier	Prefer for automotive 12V/24V systems needing AEC-Q100 qualification and higher input tolerance.

Compared with MP2359DJ-LF-Z and TPS54560BQDDAQ1, the AP65503SP-13 delivers superior light-load efficiency and simpler layout due to fully integrated power stage, while offering tighter thermal management (θ_JC = 6.3°C/W) and guaranteed 750kHz operation - ideal for consumer and industrial 5A POL designs where size and no-load power matter.

Availability

AP65503SP-13 is available at Aetrix Electronics and suitable for gaming console power delivery, FPGA point-of-load regulation, and flat-panel TV main rail applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for AP65503SP-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 AP65503 belongs to Diodes' high-current synchronous buck converter product line, engineered for space-constrained, thermally demanding applications requiring minimal external components and robust protection - especially in distributed power architectures.

FAQ

What is the minimum recommended input capacitance for AP65503SP-13?

The datasheet specifies a 44µF ceramic input capacitor as standard for most applications. This value is selected to handle RMS input ripple current exceeding half the 5A load (≥2.5A RMS) while maintaining low ESR (<5mΩ). Larger values improve hold-up time but require verification of surge current rating and physical footprint constraints.

Can AP65503SP-13 operate with an output voltage below 2.5V?

No - the device's feedback reference is fixed at 0.800V, and the datasheet confirms stable operation only down to 2.5V output (using R1 = 21.5kΩ, R2 = 10kΩ). Attempting lower outputs violates the minimum VFB headroom required for error amplifier linearity and may cause regulation instability or premature OVP triggering.

How does the AP65503SP-13 implement light-load efficiency improvement?

It automatically detects load current magnitude and transitions from continuous conduction mode (CCM) to pulse-frequency modulation (PFM) mode below a design-dependent threshold (~0.8–1.2A). In PFM, switching pulses are gated to maintain regulation while minimizing gate charge loss and inductor core loss - verified by 96% peak efficiency dropping only to ~82% at 10mA (per Figure 12).

Is the SO-8EP exposed pad electrically connected internally?

Yes - the EP terminal is internally connected to GND, as confirmed by the Pin Descriptions section stating "Exposed Pad is connected to ground." It must be soldered to a PCB ground plane with ≥4 thermal vias to achieve the specified θ_JA = 43°C/W and sustain 5A continuous operation without thermal throttling.

AP65503SP-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):: 2.5V

Voltage - Output (Max):: 12V

Current - Output:: 5A

Frequency - Switching:: 750kHz

Synchronous Rectifier:: Yes

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SO-EP

AP65503SP-13 FAQ

1.How can I place an order for AP65503SP-13 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP65503SP-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 AP65503SP-13 reliable?

The price and inventory of AP65503SP-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP65503SP-13 is usually 5 days.

3.What payment methods are accepted for AP65503SP-13?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP65503SP-13 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP65503SP-13?

AP65503SP-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP65503SP-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 AP65503SP-13?

For technical support, including AP65503SP-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP65503SP-13 requirements.

6.How does Aetrix verify that AP65503SP-13 is sourced from the original manufacturer or authorized distributors?

All AP65503SP-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 AP65503SP-13 meets industry standards.

7.What is the process for return or replacement of AP65503SP-13?

All AP65503SP-13 units undergo pre-shipment inspection (PSI). If there is an issue with AP65503SP-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 AP65503SP-13 part is unused and in its original packaging.

Return procedure for AP65503SP-13:

1.Submit a request within 90 days.

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

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