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

Diodes Incorporated AP3503MPTR-G1

Name: AP3503MPTR-G1
Brand: Diodes Incorporated
SKU: AP3503MPTR-G1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP3503MPTR-G1

Manufacturer:: Diodes Incorporated

Category:: Voltage Regulators - DC DC Switching Regulators

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

Datasheet:: AP3503MPTR-G1.pdf

Description:: IC REG BUCK ADJ 3A 8PSOP

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Product details

Overview

AP3503MPTR-G1 from Diodes Incorporated is a 340 kHz fixed-frequency, current-mode PWM synchronous buck DC-DC converter in PSOP-8 package, integrating low-R_DS(on) N-channel MOSFETs to deliver up to 3 A output current with peak efficiency of 95%. It features programmable soft-start, over-voltage protection (OVP), under-voltage lockout (UVLO), thermal shutdown, and cycle-by-cycle current limiting. Used in LCD TV power rails for stable 3.3 V generation from 12 V input.

For engineers reviewing the AP3503MPTR-G1 datasheet, AP3503MPTR-G1 pinout, AP3503MPTR-G1 application, or AP3503MPTR-G1 equivalent, key selection criteria include input voltage range (4.5–18 V), fixed 340 kHz switching frequency, FB reference voltage (0.925 V), soft-start timing control via external capacitor, and PSOP-8 thermal pad layout requirements.

Technical Context

The AP3503 employs peak current-mode control with an internal transconductance error amplifier (G_EA = 800 µA/V) and slope compensation to ensure stability across duty cycles. Its oscillator operates at 340 kHz (±20%) under normal conditions and drops to 90 kHz during short-circuit events for enhanced safety.

Protection circuitry includes FB-based OVP (triggered at 1.1 V), UVLO with 200 mV hysteresis, thermal shutdown at +160 °C (+20 °C hysteresis), and EN-controlled enable/disable logic with 1.5 V threshold and 350 mV hysteresis. The bootstrap (BS) and switch (SW) pins drive the high-side MOSFET using a floating gate driver referenced to SW.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	4.5 V to 18 V - supports wide-input industrial and consumer DC supplies including 5 V, 12 V, and 15 V rails.
Switching Frequency	340 kHz (typ.) - enables use of compact 10 µH inductors and reduces EMI compared to higher-frequency alternatives.
Output Current	3 A continuous - sufficient for powering SoCs, FPGAs, and display logic in set-top boxes and digital photo frames.
Feedback Reference	0.925 V (±1.8%) - sets output voltage via external resistor divider; enables precise 3.3 V, 5 V, or adjustable regulation.
High-Side R_DS(on)	100 mΩ (typ.) - minimizes conduction loss at 3 A load, contributing to >90% efficiency at mid-load conditions.
Soft-Start Time	15 ms (with 0.1 µF SS-to-GND cap) - prevents inrush current during power-up in sensitive downstream circuits.
Thermal Resistance θ_JA	60 °C/W - requires exposed pad soldered to PCB ground plane for reliable 3 A operation at +85 °C ambient.

Pinout & Package

AP3503MPTR-G1 is housed in a thermally enhanced PSOP-8 package with exposed pad (EP) that must be connected to GND for optimal thermal performance and electrical stability.

Pin/Terminal	Circuit Role	Design Meaning
1 BS	Bootstrap supply	Provides gate drive voltage for high-side MOSFET; requires 3.3 nF capacitor between BS and SW.
2 IN	Main power input	Accepts 4.5–18 V; requires local 10 µF/25 V ceramic + bulk capacitance to suppress ripple and transients.
3 SW	Power switch node	Connects to inductor and bootstrap capacitor; carries high di/dt switching current - needs tight loop layout.
4 GND	Analog & power ground	Reference for FB, COMP, EN, SS; must tie to EP and input/output capacitors' ground planes.
5 FB	Voltage feedback sense	Monitors output via resistor divider; OVP triggers at 1.1 V, SCP activates below 0.3 V.
6 COMP	Error amplifier output	Loop compensation node; requires RC network to GND for stability - critical for transient response tuning.
7 EN	Enable control	Digital input: ≥1.5 V = on, ≤1.1 V = off; internal pull-up not provided - external 100 kΩ to IN required for auto-start.
8 SS	Soft-start timing	Capacitor-to-GND sets ramp time; 0.1 µF = 15 ms; open = disable soft-start (not recommended).
EP	Exposed thermal pad	Must be soldered to solid GND copper area - primary path for heat dissipation and noise reduction.

Key Features

Feature	Design Value
Current-mode PWM control	Enables fast load transient response (<50 µs recovery) and inherent cycle-by-cycle current limiting without external sense resistor.
Integrated dual MOSFETs	Reduces BOM count and layout area; high-side and low-side R_DS(on) both 100 mΩ typ., minimizing conduction losses.
Programmable soft-start	Prevents input inrush and output overshoot via external capacitor; eliminates need for external sequencers in multi-rail systems.
Comprehensive protection suite	OVP, UVLO, thermal shutdown, and short-circuit foldback operate autonomously - no firmware or external supervision needed.
PSOP-8 with exposed pad	Delivers 60 °C/W θ_JA with proper PCB layout - supports 3 A continuous output at +85 °C ambient without heatsink.

Applications

LCD TV Power Supply

Set-Top Box Core Rail

Use Scenario: Generating stable 3.3 V for main SoC, HDMI PHY, and audio codec in 24/7-operated LCD TVs.

IC Role / Device Role / Timing Role: Primary synchronous buck regulator converting 12 V bus to 3.3 V with tight line/load regulation (±1.5%).

Use Value: 95% peak efficiency reduces thermal stress on board; UVLO ensures safe startup only above 4.0 V input.

Use Scenario: Providing clean 5 V or adjustable output for demodulator, tuner, and memory subsystems in cable/satellite STBs.

IC Role / Device Role / Timing Role: Fixed-frequency buck controller with programmable soft-start to coordinate power sequencing with MCU reset.

Use Value: 340 kHz switching allows cost-effective 10 µH shielded inductor; COMP pin enables robust loop compensation for variable loads.

Portable DVD Player

Digital Photo Frame

Use Scenario: Stepping down single-cell Li-ion (4.2 V) or dual-cell (8.4 V) battery to 3.3 V for display driver and media processor.

IC Role / Device Role / Timing Role: High-efficiency buck converter operating down to 4.5 V input, supporting battery discharge down to ~3.8 V before UVLO cutoff.

Use Value: Low quiescent current (1.2 mA typ.) extends battery runtime; thermal shutdown prevents damage during enclosure overheating.

Use Scenario: Converting 5 V USB or wall adapter input to regulated 3.3 V for TFT LCD bias, microcontroller, and SD card interface.

IC Role / Device Role / Timing Role: Compact PSOP-8 solution with integrated switches - eliminates discrete MOSFETs and gate drivers.

Use Value: Exposed pad enables direct thermal coupling to chassis; EN pin allows software-controlled power cycling for energy savings.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MP2307DN-LF-Z (Monolithic Power)	400 kHz switching, 3 A rating, but lacks FB OVP and has higher R_DS(on) (120 mΩ high-side).	Requires external OVP circuit for safety-critical outputs; less suitable for unattended consumer devices.	Choose when higher frequency allows smaller magnetics and board space is constrained over protection completeness.
TPS54302DDCR (Texas Instruments)	Adjustable frequency (200–1600 kHz), 3 A, integrated soft-start, but no dedicated SS pin - soft-start time fixed internally.	Less flexible for custom power-up timing; requires different compensation design due to voltage-mode control.	Prefer when system demands frequency synchronization or spread-spectrum EMI reduction not supported by AP3503.

Compared with MP2307DN-LF-Z and TPS54302DDCR, the AP3503MPTR-G1 offers superior built-in protection (OVP, SCP, thermal hysteresis) and a dedicated SS pin for precise timing control - critical for reliable operation in cost-sensitive, high-volume consumer electronics.

Availability

AP3503MPTR-G1 is available at Aetrix Electronics and suitable for LCD TV power rails, set-top box core supplies, and portable media device DC-DC conversion requiring stable component supply, RoHS/Green compliance, and tape-and-reel packaging for automated assembly.

Supply support for AP3503MPTR-G1 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 power management, signal integrity, and protection solutions for consumer, industrial, and computing markets.

The AP3503 belongs to Diodes' high-efficiency synchronous buck converter product line, designed specifically for cost-sensitive, high-volume consumer electronics requiring robust protection, minimal external components, and PSOP-8 thermal performance.

FAQ

What is the minimum input voltage required for AP3503MPTR-G1 to start switching?

The AP3503MPTR-G1 initiates switching when input voltage rises above the UVLO threshold of 4.00 V (typ.), with 200 mV hysteresis ensuring stable turn-on. Below 3.65 V, the device remains latched off. This behavior prevents erratic operation during brown-out conditions in 5 V or 12 V supply rails.

Can the AP3503MPTR-G1 be used to generate 5 V output from a 12 V input?

Yes - configure the FB resistor divider so that V_FB = 0.925 V at the desired output. For 5 V output, use R1 = 43.2 kΩ (top) and R2 = 10 kΩ (bottom). Ensure inductor saturation current exceeds 5 A peak and output capacitance meets ripple and transient requirements per the datasheet's typical application circuit.

Is an external bootstrap capacitor mandatory, and what value is recommended?

Yes - a bootstrap capacitor between BS and SW is mandatory to drive the high-side MOSFET gate. Diodes recommends 3.3 nF ceramic (X7R, 16 V rating) placed as close as possible to pins 1 and 3. Larger values (>10 nF) may cause startup delay; smaller values risk insufficient gate drive under heavy load.

How does the AP3503MPTR-G1 respond during output short-circuit conditions?

Under short-circuit, FB voltage drops below 0.3 V, triggering short-circuit protection: oscillator frequency reduces from 340 kHz to 90 kHz, limiting average current and power dissipation. Recovery is automatic once fault clears and FB rises above 0.3 V - no latch-off or manual reset required.

AP3503MPTR-G1 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):: 4.5V

Voltage - Input (Max):: 18V

Voltage - Output (Min/Fixed):: 0.925V

Voltage - Output (Max):: 16.2V

Current - Output:: 3A

Frequency - Switching:: 340kHz

Synchronous Rectifier:: Yes

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-PSOP

AP3503MPTR-G1 FAQ

1.How can I place an order for AP3503MPTR-G1 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP3503MPTR-G1 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 AP3503MPTR-G1 reliable?

The price and inventory of AP3503MPTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP3503MPTR-G1 is usually 5 days.

3.What payment methods are accepted for AP3503MPTR-G1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP3503MPTR-G1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP3503MPTR-G1?

AP3503MPTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP3503MPTR-G1 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 AP3503MPTR-G1?

For technical support, including AP3503MPTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP3503MPTR-G1 requirements.

6.How does Aetrix verify that AP3503MPTR-G1 is sourced from the original manufacturer or authorized distributors?

All AP3503MPTR-G1 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 AP3503MPTR-G1 meets industry standards.

7.What is the process for return or replacement of AP3503MPTR-G1?

All AP3503MPTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AP3503MPTR-G1, 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 AP3503MPTR-G1 part is unused and in its original packaging.

Return procedure for AP3503MPTR-G1:

1.Submit a request within 90 days.

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

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