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Diodes Incorporated AP3502EMTR-G1
- Part No.:
- AP3502EMTR-G1
- Manufacturer:
- Diodes Incorporated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AP3502EMTR-G1.pdf
- Description:
- IC REG BUCK ADJ 2A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,028
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Product details
Overview
AP3502EMTR-G1 from Diodes Incorporated is a fixed-frequency (340 kHz), current-mode, synchronous buck DC-DC converter in SOIC-8 package, delivering up to 2 A output current with peak efficiency of 95% across 4.5–18 V input range. It integrates low-RDS(on) N-channel high- and low-side MOSFETs, supports programmable soft-start via external capacitor, and provides full protection including OVP (1.1 V FB threshold), UVLO (4.0 V typ), hiccup-mode SCP, and thermal shutdown at +160 °C. Used in LCD TV power rails and set-top box core supplies.
For engineers reviewing the AP3502EMTR-G1 datasheet, AP3502EMTR-G1 pinout, AP3502EMTR-G1 application, or AP3502EMTR-G1 equivalent, key selection criteria include its 340 kHz fixed switching frequency, 2 A continuous output capability, SOIC-8 thermal resistance (θJA = 105 °C/W), integrated MOSFETs with 100 mΩ RDS(on), and feedback reference voltage of 0.925 V ±1.9%.
Technical Context
The AP3502EMTR-G1 employs peak current-mode control with internal transconductance error amplifier (GEA = 800 μA/V) and slope compensation, enabling fast transient response and inherent cycle-by-cycle current limiting. Its oscillator operates at 340 kHz (±18%) under normal conditions and drops to 90 kHz during short-circuit events for thermal management.
Protection architecture includes dual-threshold EN pin logic (1.5 V turn-on, 2.5 V lockout), FB-based overvoltage detection (1.1 V trigger), and thermal shutdown with 30 °C hysteresis. The bootstrap circuit drives the high-side MOSFET using a capacitor between BS and SW pins, requiring careful PCB layout for reliable gate drive.
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) - Enables use of compact 10 μH inductors and reduces EMI compared to higher-frequency alternatives. |
| Output Current | 2 A continuous - Sustains full load at ambient temperatures up to +85 °C with standard SOIC-8 PCB copper area. |
| Feedback Reference | 0.925 V ±1.9% - Sets output voltage via resistor divider; enables precise 3.3 V, 5 V, or adjustable outputs. |
| Efficiency | Up to 95% - Achieved at mid-load (1 A) with 12 V input → 3.3 V output, minimizing thermal stress. |
| Thermal Shutdown | +160 °C with +30 °C hysteresis - Prevents permanent damage while allowing recovery after cooling. |
| Soft-Start Time | 15 ms (with 0.1 μF SS-to-GND capacitor) - Limits inrush current during power-up to protect input capacitors and source. |
Pinout & Package
AP3502EMTR-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 assignments are validated per Diodes DS41524 Rev. 4 (Feb 2020).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (BS) | Bootstrap supply | Connects external capacitor to SW to generate gate drive voltage for high-side MOSFET; critical for duty cycle >90% operation. |
| 2 (IN) | Main power input | Accepts 4.5–18 V; requires local ceramic bypass (≥0.1 μF) and bulk capacitor (≥10 μF) to suppress ripple and sustain peak current. |
| 3 (SW) | Power switch node | Drives external inductor; connects to bootstrap capacitor; carries high di/dt - must be routed short and wide to minimize EMI. |
| 4 (GND) | Analog/digital ground | Single ground reference for all internal circuits; must tie to power ground plane with low-inductance connection near IN and SW pins. |
| 5 (FB) | Voltage feedback input | Senses output via resistor divider; triggers OVP at 1.1 V and enters SCP mode if pulled below 0.3 V. |
| 6 (COMP) | Error amplifier output | Loop compensation node; requires RC network to GND to stabilize control loop; optional extra capacitor improves phase margin. |
| 7 (EN) | Enable control | Logic-level input: ≥1.5 V enables regulator; ≤1.1 V disables; internal pull-up allows auto-start when left floating. |
| 8 (SS) | Soft-start timing | Capacitor-to-GND sets ramp time; 0.1 μF = 15 ms; open-circuit disables soft-start, causing immediate full-output assertion. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power MOSFETs | High- and low-side N-channel switches with 100 mΩ RDS(on) each - eliminates external FETs and gate drivers, reducing BOM count and layout complexity. |
| Current-Mode Control | Internal slope compensation and transconductance error amplifier (AEA = 400 V/V) - ensures stable operation across wide input/output ranges and fast load-step response. |
| Hiccup-Mode Short-Circuit Protection | Reduces average power dissipation during sustained overload by cycling on/off - prevents thermal runaway without requiring external current-sense resistors. |
| Programmable Soft-Start | External capacitor sets startup ramp time (5 μA constant current into SS pin) - avoids output overshoot and limits input inrush in multi-rail systems. |
| Comprehensive Fault Protection | UVLO (4.0 V), OVP (1.1 V FB), thermal shutdown (+160 °C), and EN lockout (2.5 V) - enables robust, maintenance-free operation in unattended consumer electronics. |
Applications
| LCD TV Main Board | Set-Top Box SoC Core Supply |
|---|---|
|
Use Scenario: Powers main logic board in 32–55 inch LCD TVs, converting 12 V rail to 3.3 V for MCU, TCON, and interface ICs. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering regulated 3.3 V at up to 2 A with tight line/load regulation (<±1%). Use Value: High light-load efficiency extends standby battery life in smart TV remote wake-up circuits; hiccup-mode SCP prevents damage during panel ESD events. |
Use Scenario: Supplies 1.2 V or 1.8 V core voltage to ARM-based SoCs in cable/satellite set-top boxes operating from 12 V adapter input. IC Role / Device Role / Timing Role: Adjustable-output buck converter configured via FB divider; supports dynamic voltage scaling during channel change or recording. Use Value: 340 kHz fixed frequency simplifies EMI filter design; COMP pin allows loop tuning for stable operation with low-ESR polymer output capacitors. |
| Portable DVD Player | Digital Photo Frame |
|
Use Scenario: Generates 5 V USB-compatible output from single-cell Li-ion (4.2 V max) or dual-cell NiMH (3.0 V min) battery packs. IC Role / Device Role / Timing Role: Step-up/step-down capable buck regulator used in battery-powered portable media devices with variable input voltage. Use Value: UVLO at 3.65 V prevents deep discharge; 95% peak efficiency extends playback time; SOIC-8 footprint fits space-constrained PCB layouts. |
Use Scenario: Provides clean 3.3 V supply for display driver ICs and microcontroller in wall-mounted digital photo frames powered from 5 V USB adapters. IC Role / Device Role / Timing Role: Fixed-output buck converter with EN pin controlled by system MCU to enable/disable display backlight and memory subsystems. Use Value: Low quiescent current (1.2 mA typ) minimizes no-display standby power; FB OVP protects OLED/LCD panels from overvoltage damage. |
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 frequency, 3 A rating, 0.925 V reference, but lacks hiccup-mode SCP and has higher IQ (2.5 mA) | Higher output current suits more demanding SoC rails; absence of hiccup SCP requires external current limiting for short-circuit resilience | Select when 3 A output and smaller inductor size are prioritized over fault robustness in cost-sensitive designs |
| RT8205AZSP (Richtek) | Fixed 500 kHz frequency, 2 A rating, 0.8 V reference, includes light-load PFM mode but no programmable soft-start | Higher frequency allows smaller magnetics; lower reference voltage enables tighter 1.2 V core regulation; missing SS pin limits inrush control | Prefer for space-constrained applications needing 1.2 V core supply where soft-start is managed upstream |
Compared with MP2307DN-LF-Z and RT8205AZSP, the AP3502EMTR-G1 offers superior fault coverage (hiccup SCP, dual-threshold EN, FB-based OVP) and design flexibility (programmable soft-start, 340 kHz for balanced EMI/efficiency), making it optimal for consumer electronics requiring field reliability and ease of qualification.
Availability
AP3502EMTR-G1 is available at Aetrix Electronics and suitable for LCD TV power rails, set-top box SoC 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 AP3502EMTR-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 AP3502E belongs to Diodes' high-efficiency synchronous buck converter product line, designed specifically for cost-sensitive, space-constrained consumer electronics requiring robust protection, simple layout, and minimal external components.
FAQ
What is the minimum input voltage required for reliable operation of AP3502EMTR-G1?
The AP3502EMTR-G1 has a guaranteed UVLO turn-on threshold of 3.65 V (min), with typical activation at 4.00 V and hysteresis of 200 mV. Operation below 4.5 V is possible only during brief transients; sustained input below 4.5 V may cause unstable regulation or premature shutdown due to insufficient gate drive headroom for the integrated high-side MOSFET.
Can AP3502EMTR-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 output reaches 5 V (e.g., R1 = 45.3 kΩ, R2 = 10 kΩ). The device supports duty cycles up to 90%, enabling 5 V output from 12 V input (D ≈ 42%), well within operational limits. Ensure inductor saturation current exceeds 2.7 A peak per datasheet ILIMH specification.
Does AP3502EMTR-G1 require an external bootstrap diode?
No - the AP3502EMTR-G1 uses a charge-pump-based bootstrap circuit and does not require an external diode. A ceramic capacitor (typically 0.1 μF) must be placed between BS and SW pins; this capacitor is charged during the low-side conduction phase and supplies gate drive voltage for the high-side MOSFET during its on-time.
How does the hiccup-mode short-circuit protection behave during sustained overload?
When FB voltage falls below 0.3 V (indicating severe overload or short), the AP3502EMTR-G1 reduces switching frequency to 90 kHz and enters hiccup mode: it attempts to restart every ~20 ms, monitors FB, and shuts down again if short persists. This limits average power dissipation to <1 W, preventing thermal damage while enabling automatic recovery once fault is removed.
AP3502EMTR-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
AP3502EMTR-G1 FAQ
1.How can I place an order for AP3502EMTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP3502EMTR-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 AP3502EMTR-G1 reliable?
The price and inventory of AP3502EMTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP3502EMTR-G1 is usually 5 days.
3.What payment methods are accepted for AP3502EMTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP3502EMTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP3502EMTR-G1?
AP3502EMTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP3502EMTR-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 AP3502EMTR-G1?
For technical support, including AP3502EMTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP3502EMTR-G1 requirements.
6.How does Aetrix verify that AP3502EMTR-G1 is sourced from the original manufacturer or authorized distributors?
All AP3502EMTR-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 AP3502EMTR-G1 meets industry standards.
7.What is the process for return or replacement of AP3502EMTR-G1?
All AP3502EMTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AP3502EMTR-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 AP3502EMTR-G1 part is unused and in its original packaging.
Return procedure for AP3502EMTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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