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

Diodes Incorporated AP3502FMTR-G1

Name: AP3502FMTR-G1
Brand: Diodes Incorporated
SKU: AP3502FMTR-G1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP3502FMTR-G1

Manufacturer:: Diodes Incorporated

Category:: Voltage Regulators - DC DC Switching Regulators

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

Datasheet:: AP3502FMTR-G1.pdf

Description:: IC REG BUCK ADJ 2A 8SOIC

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Product details

Overview

AP3502FMTR-G1 from Diodes Incorporated is a 340 kHz fixed-frequency, current-mode PWM synchronous buck DC-DC converter in SOIC-8 package, integrating low-R_DS(on) N-channel high- and low-side MOSFETs. It delivers up to 2 A output current with 95% peak efficiency, 4.5–18 V input range, and features overvoltage protection, UVLO, thermal shutdown, and programmable soft-start - used in LCD TV power rails.

For engineers reviewing the AP3502FMTR-G1 datasheet, AP3502FMTR-G1 pinout, AP3502FMTR-G1 application, or AP3502FMTR-G1 equivalent, key selection criteria include its 340 kHz switching frequency, 0.925 V feedback reference, 2.7–3.5 A current limit, SOIC-8 thermal resistance (θ_JA = 105 °C/W), and bootstrap-driven high-side gate control.

Technical Context

The AP3502FMTR-G1 implements current-mode control with cycle-by-cycle current limiting and fast transient response via transconductance error amplifier (G_EA = 800 μA/V) and slope-compensated PWM comparator. Its internal oscillator operates at 340 kHz (±18%) under normal conditions and drops to 90 kHz during short-circuit events for enhanced safety.

Protection architecture includes input UVLO (4.0 V threshold, 200 mV hysteresis), output OVP (1.1 V FB threshold), thermal shutdown at +160 °C (+30 °C hysteresis), and soft-start controlled by external capacitor on SS pin (15 ms with 0.1 μF). The COMP pin supports loop compensation via RC network to GND.

Key Specifications

Parameter	Value and Actual Design Meaning
Switching Frequency	340 kHz fixed; enables compact magnetics and predictable EMI profile
Input Voltage Range	4.5 V to 18 V; supports 5 V, 12 V, and 15 V intermediate bus systems
Output Current	2 A continuous; sufficient for core logic or display bias rails in consumer electronics
Feedback Reference	0.925 V ±1.8%; sets output voltage via resistor divider on FB pin
High-Side R_DS(on)	100 mΩ typical; reduces conduction loss at full load
Quiescent Current	1.2 mA typical; minimizes no-load power draw in always-on subsystems
Thermal Shutdown	+160 °C with +30 °C hysteresis; prevents permanent junction damage during overload

Pinout & Package

AP3502FMTR-G1 is housed in a standard SOIC-8 (Small Outline Integrated Circuit) package with 1.27 mm pitch, 4.9–5.1 mm width, and 6.0–6.2 mm length. Thermal resistance θ_JA is 105 °C/W, requiring minimal copper area for 2 A operation at +85 °C ambient.

Pin/Terminal	Circuit Role	Design Meaning
1 BS	Bootstrap supply	Drives high-side MOSFET gate via external capacitor between BS and SW; enables 100% duty cycle capability
2 IN	Main power input	Accepts 4.5–18 V; requires local ceramic bypass capacitor to GND for stability
3 SW	Power switch node	Connects to inductor and bootstrap capacitor; carries high di/dt switching current
4 GND	Power and signal ground	Common return for power path, feedback, and control circuitry; must be low-impedance
5 FB	Voltage feedback input	Senses output via resistor divider; triggers OVP at 1.1 V and SCP at <0.3 V
6 COMP	Error amplifier output	Loop compensation node; connects to GND via RC network to set phase margin
7 EN	Enable control	Digital input: >1.5 V = ON, <1.1 V = OFF; internal pull-up enables auto-start when left floating
8 SS	Soft-start timing	Capacitor-to-GND sets ramp time (15 ms with 0.1 μF); disables if left open

Key Features

Feature	Design Value
Integrated synchronous MOSFETs	Eliminates external high-side driver and external low-side diode, reducing BOM count and layout area
Current-mode PWM control	Provides inherent cycle-by-cycle current limiting and stable operation across wide input/output ranges
Programmable soft-start	Prevents inrush current and output overshoot via external capacitor on SS pin
Comprehensive protection suite	Includes UVLO, OVP, OTP, and short-circuit recovery - no external fault-handling circuitry required
Low quiescent current	1.2 mA typical enables efficient operation in standby or battery-backed subsystems

Applications

LCD TV Power Supply

Set-Top Box Core Rail

Use Scenario: Provides stable 3.3 V or 5 V bias for TCON, MCU, and audio DAC in flat-panel displays.

IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering regulated DC output from 12 V intermediate bus.

Use Value: High efficiency (>92% at 1.5 A) reduces heatsink requirements; SOIC-8 footprint simplifies thermal management.

Use Scenario: Powers SoC core logic and HDMI interface circuitry in digital broadcast receivers.

IC Role / Device Role / Timing Role: Step-down regulator with fast transient response to handle burst-mode video processing loads.

Use Value: Current-mode control ensures <50 µs recovery from 1 A → 2 A load steps; OVP protects downstream HDMI PHY.

Portable DVD Player

Digital Photo Frame

Use Scenario: Generates 3.3 V system rail from single-cell Li-ion (4.2 V max) or 5 V USB input.

IC Role / Device Role / Timing Role: Buck converter operating down to 4.5 V input with UVLO lockout below 4.0 V to prevent brownout.

Use Value: 95% peak efficiency extends battery runtime; soft-start prevents mechanical noise in motor-driven disc trays.

Use Scenario: Supplies 3.3 V to LCD controller and flash memory in always-on photo display units.

IC Role / Device Role / Timing Role: Always-on regulator with low 1.2 mA quiescent current and thermal shutdown for unattended operation.

Use Value: +160 °C thermal cutoff prevents fire hazard in enclosed plastic enclosures; compact SOIC-8 eases PCB space constraints.

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	400 kHz switching frequency, 3 A output, 0.8 V reference, no integrated bootstrap diode	Higher current rating but requires external bootstrap diode; less integrated than AP3502F	Select when >2 A load or tighter output tolerance (<±1%) is required
TPS54202DRCT	500 kHz frequency, 2 A, 0.6 V reference, integrated soft-start and enable, higher IQ (24 μA)	Lower reference enables precise low-VOUT regulation; better light-load efficiency	Select for battery-powered designs needing ultra-low quiescent current and precision 1.2 V or lower outputs

Compared with MP2307DN-LF-Z and TPS54202DRCT, AP3502FMTR-G1 offers tighter integration (no external bootstrap diode), lower cost per function, and proven reliability in consumer display applications - but lacks adjustable frequency or remote sensing.

Availability

AP3502FMTR-G1 is available at Aetrix Electronics and suitable for LCD TV power supplies, set-top box core rails, and portable DVD player systems requiring stable component supply and long-term design continuity.

Supply support for AP3502FMTR-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 AP3502F belongs to Diodes' synchronous buck converter product line, designed specifically for cost-sensitive, medium-power consumer electronics where integration, thermal robustness, and protection completeness are prioritized over programmability.

FAQ

What is the minimum input voltage required for reliable startup?

The AP3502FMTR-G1 has an input UVLO threshold of 4.00 V (typical) with 200 mV hysteresis. Startup occurs when VIN rises above 4.25 V, and the device remains operational down to 3.65 V before latching off. Below 4.5 V, output regulation degrades due to reduced duty cycle headroom, so 4.5 V is the recommended minimum for full-spec operation.

Can the AP3502FMTR-G1 be used without the soft-start capacitor?

Yes - leaving the SS pin unconnected disables soft-start, causing immediate full-output activation at EN assertion. This may result in inrush current exceeding 3 A and output overshoot >10%, especially with large output capacitance. Diodes recommends using ≥0.01 μF on SS for all production designs to ensure controlled ramp-up and avoid stress on downstream components.

What is the maximum achievable output voltage with the AP3502FMTR-G1?

The AP3502FMTR-G1 supports output voltages up to 16.5 V, calculated as V_FB × (1 + R1/R2), where V_FB = 0.925 V. However, practical limits arise from the 21 V absolute maximum SW pin voltage and 18 V maximum IN rating. For V_IN = 18 V, maximum safe V_OUT is ~16.5 V with adequate margin against SW node ringing and layout parasitics.

How does the AP3502FMTR-G1 respond to a short-circuit condition on the output?

Under short-circuit, the FB pin voltage drops below 0.3 V, triggering short-circuit protection: the oscillator frequency reduces from 340 kHz to 90 kHz, limiting average inductor current and power dissipation. Recovery is automatic once the fault clears and FB rises above 0.3 V. No latch-off occurs, enabling self-recovery without EN cycling.

AP3502FMTR-G1 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

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

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:: 2A

Frequency - Switching:: 340kHz

Synchronous Rectifier:: Yes

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

AP3502FMTR-G1 FAQ

1.How can I place an order for AP3502FMTR-G1 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP3502FMTR-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 AP3502FMTR-G1 reliable?

The price and inventory of AP3502FMTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP3502FMTR-G1 is usually 5 days.

3.What payment methods are accepted for AP3502FMTR-G1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP3502FMTR-G1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP3502FMTR-G1?

AP3502FMTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP3502FMTR-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 AP3502FMTR-G1?

For technical support, including AP3502FMTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP3502FMTR-G1 requirements.

6.How does Aetrix verify that AP3502FMTR-G1 is sourced from the original manufacturer or authorized distributors?

All AP3502FMTR-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 AP3502FMTR-G1 meets industry standards.

7.What is the process for return or replacement of AP3502FMTR-G1?

All AP3502FMTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AP3502FMTR-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 AP3502FMTR-G1 part is unused and in its original packaging.

Return procedure for AP3502FMTR-G1:

1.Submit a request within 90 days.

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

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