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Diodes Incorporated AP3502MTR-G1
- Part No.:
- AP3502MTR-G1
- Manufacturer:
- Diodes Incorporated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AP3502MTR-G1.pdf
- Description:
- IC REG BUCK ADJ 2A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,074
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Product details
Overview
AP3502MTR-G1 from Diodes Incorporated is a fixed-frequency (340 kHz), current-mode synchronous buck DC-DC converter in SOIC-8 package, integrating low-RDS(on) N-channel high- and low-side MOSFETs to deliver up to 2 A output current at 4.5–18 V input. It features programmable soft-start, over-voltage protection (OVP) triggered at 1.1 V on FB, thermal shutdown at +160 °C, and UVLO with 4.0 V threshold and 200 mV hysteresis - deployed in LCD TV power rails.
For engineers reviewing the AP3502MTR-G1 datasheet, AP3502MTR-G1 pinout, AP3502MTR-G1 application, or AP3502MTR-G1 equivalent, key selection criteria include its 2 A continuous output capability, integrated MOSFETs eliminating external switches, current-mode control for fast transient response, and SOIC-8 thermal resistance (θJA = 105 °C/W) for board-level thermal design.
Technical Context
The AP3502MTR-G1 implements peak current-mode PWM control with an internal oscillator fixed at 340 kHz (±18%), enabling stable loop compensation via the COMP pin using an external RC network. Its transconductance error amplifier (GEA = 800 μA/V) compares FB voltage against a 0.925 V reference to regulate output voltage.
Protection architecture includes cycle-by-cycle current limiting (ILIMH = 3.5 A typ.), short-circuit detection via reduced oscillator frequency (90 kHz), OVP (1.1 V FB threshold), UVLO (4.0 V turn-on), and thermal shutdown with 30 °C hysteresis - all implemented with dedicated comparators and logic without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 18 V - supports 5 V, 12 V, and 15 V intermediate bus systems without pre-regulation. |
| Switching Frequency | 340 kHz (typ.) - balances inductor size (e.g., 10 μH) and efficiency for mid-power applications. |
| Output Current | 2 A continuous - sufficient for powering SoCs, FPGAs, and display logic in consumer electronics. |
| Feedback Reference | 0.925 V ±1.9% - enables precise output setting (e.g., 3.3 V with 26.1 kΩ/13 kΩ divider) and OVP at 1.1 V. |
| High-Side RDS(on) | 100 mΩ (typ.) - reduces conduction loss at 2 A, contributing to ≥95% peak efficiency at 12 V → 3.3 V conversion. |
| Thermal Shutdown | +160 °C with +30 °C hysteresis - prevents permanent damage during sustained overload or poor heatsinking. |
| Soft-Start Time | 15 ms (with 0.1 μF SS-to-GND capacitor) - limits inrush current during power-up in multi-rail systems. |
Pinout & Package
AP3502MTR-G1 is housed in a standard SOIC-8 (3.9 mm × 4.9 mm) package with exposed pad not present; θJA = 105 °C/W. Pin functions are validated per Diodes DS41518 Rev. 4.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 BS | Bootstrap supply | Drives gate of internal high-side MOSFET via external bootstrap capacitor (BS–SW); enables 100% duty cycle capability. |
| 2 IN | Main power input | Accepts 4.5–18 V; requires local ceramic bypass (e.g., 0.1 μF) to GND for high-frequency noise suppression. |
| 3 SW | Switch node | Connects to inductor and bootstrap capacitor; carries high di/dt switching current - layout critical for EMI. |
| 4 GND | Power ground | Common return for power stage and control circuitry; must be low-impedance plane under IC footprint. |
| 5 FB | Voltage feedback | Senses output via resistor divider; 0.925 V reference sets VOUT; >1.1 V triggers OVP shutdown. |
| 6 COMP | Error amplifier output | Loop compensation node - connect RC network to GND to stabilize control loop across load/line variations. |
| 7 EN | Enable control | Logic-level input (1.5 V threshold); pull-up to VIN enables auto-start; drives low to disable regulator. |
| 8 SS | Soft-start timing | Capacitor-to-GND sets ramp time (15 ms with 0.1 μF); open-circuit disables soft-start. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated dual N-MOSFETs | Eliminates external high- and low-side switches, reducing BOM count and PCB area in space-constrained designs. |
| Current-mode PWM control | Enables inherent cycle-by-cycle current limiting and fast load transient response (<50 μs settling). |
| Programmable soft-start | Prevents input inrush and output overshoot by controlling FB reference ramp rate via external SS capacitor. |
| Comprehensive protection suite | Includes UVLO, OVP, thermal shutdown, and short-circuit recovery - no external fault-handling circuitry required. |
| SOIC-8 thermal performance | θJA = 105 °C/W allows 2 A operation at +85 °C ambient with minimal copper pour, simplifying thermal design. |
Applications
| LCD TV Power Supply | Set-Top Box Core Rail |
|---|---|
|
Use Scenario: Generating 3.3 V main logic rail from 12 V intermediate bus in slim-panel LCD TVs. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering regulated 2 A output with tight line/load regulation. Use Value: Integrated MOSFETs reduce solution size; 95% efficiency minimizes heat buildup behind thin bezels. |
Use Scenario: Providing stable 1.2 V or 1.8 V core voltage to MPEG decoder SoCs in cable/satellite STBs. IC Role / Device Role / Timing Role: Step-down converter with fast transient response to handle bursty video decoding loads. Use Value: Current-mode control ensures <50 μs recovery from 1 A → 2 A load steps, preventing brownouts. |
| Portable DVD Player | Digital Photo Frame |
|
Use Scenario: Converting single-cell Li-ion (4.2 V max) or 5 V USB input to 3.3 V system rail in portable DVD players. IC Role / Device Role / Timing Role: High-efficiency buck converter operating down to 4.5 V input with UVLO lockout below 4.0 V. Use Value: 1.2 mA quiescent current extends battery runtime; soft-start prevents motor startup glitches. |
Use Scenario: Regulating 5 V USB or wall adapter input to 3.3 V for LCD controller and memory in photo frames. IC Role / Device Role / Timing Role: Compact, low-noise DC-DC source with OVP protecting sensitive display drivers. Use Value: SOIC-8 footprint fits narrow PCBs; 2000 V HBM ESD rating improves manufacturing yield. |
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) | Fixed 340 kHz, 2 A, but uses external bootstrap diode; higher IQ (2.5 mA) and no OVP. | Lacks integrated OVP and has less robust short-circuit protection - requires external fault monitoring. | Choose when cost sensitivity outweighs protection requirements and board space permits diode placement. |
| TPS54202DRCT (Texas Instruments) | Adjustable 200–1600 kHz, 2 A, with integrated soft-start and OVP, but higher RDS(on) (120 mΩ HS). | Better frequency flexibility and tighter VREF (0.8 V ±1%) but lower efficiency at 12 V→3.3 V due to higher conduction loss. | Prefer for designs needing programmable frequency or tighter output tolerance; accept ~1–2% efficiency penalty. |
Compared with MP2307DN-LF-Z and TPS54202DRCT, the AP3502MTR-G1 delivers superior protection integration (OVP, UVLO, thermal shutdown), lower RDS(on), and simpler layout - making it optimal for cost-sensitive, space-constrained consumer power rails where reliability is prioritized over frequency tuning.
Availability
AP3502MTR-G1 is available at Aetrix Electronics and suitable for LCD TV power supplies, set-top box core rails, and portable DVD player system rails requiring stable component supply, RoHS-compliant packaging, and tape-and-reel delivery for automated assembly.
Supply support for AP3502MTR-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 high-volume consumer and industrial markets.
The AP3502 belongs to Diodes' synchronous buck converter product line, designed specifically for compact, efficient, and reliable point-of-load regulation in cost-sensitive consumer electronics with strict thermal and safety constraints.
FAQ
What is the minimum input voltage required for AP3502MTR-G1 to start switching?
The AP3502MTR-G1 initiates switching when the IN pin voltage rises above the UVLO turn-on threshold of 4.00 V (typ.), with 200 mV hysteresis ensuring stable startup. Below 3.65 V, the device remains latched off. This behavior is verified in DS41518 Rev. 4 Section 5 (Absolute Maximum Ratings) and Section 6 (Recommended Operating Conditions).
Can the AP3502MTR-G1 be used to generate 5 V output from a 12 V input?
Yes - configure the FB resistor divider so that the voltage at FB equals 0.925 V when VOUT = 5 V (e.g., R1 = 45.3 kΩ, R2 = 10 kΩ). The device supports output voltages up to VIN − Vdropout, and 5 V is well within its regulation range. Output stability depends on proper COMP compensation per the datasheet's Type II network guidelines.
Does AP3502MTR-G1 require an external bootstrap diode?
No - the AP3502MTR-G1 integrates an internal bootstrap switch and does not require an external diode. A ceramic capacitor (typically 0.1 μF) is placed between BS and SW pins to provide gate drive voltage for the high-side MOSFET, as confirmed in the Pin Descriptions and Typical Application Circuit sections of DS41518.
How is short-circuit protection implemented in AP3502MTR-G1?
Short-circuit protection activates when FB voltage drops below 0.3 V, causing the oscillator frequency to reduce from 340 kHz to 90 kHz. This lowers switching losses and limits average current while maintaining regulation attempt. Recovery occurs automatically once the fault clears and FB rises above 0.3 V - no latch-off or manual reset is needed.
AP3502MTR-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
AP3502MTR-G1 FAQ
1.How can I place an order for AP3502MTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP3502MTR-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 AP3502MTR-G1 reliable?
The price and inventory of AP3502MTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP3502MTR-G1 is usually 5 days.
3.What payment methods are accepted for AP3502MTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP3502MTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP3502MTR-G1?
AP3502MTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP3502MTR-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 AP3502MTR-G1?
For technical support, including AP3502MTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP3502MTR-G1 requirements.
6.How does Aetrix verify that AP3502MTR-G1 is sourced from the original manufacturer or authorized distributors?
All AP3502MTR-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 AP3502MTR-G1 meets industry standards.
7.What is the process for return or replacement of AP3502MTR-G1?
All AP3502MTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AP3502MTR-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 AP3502MTR-G1 part is unused and in its original packaging.
Return procedure for AP3502MTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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