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Diodes Incorporated AP3003S-3.3TRE1
- Part No.:
- AP3003S-3.3TRE1
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
AP3003S-3.3TRE1.pdf
- Description:
- IC REG BUCK 3.3V 3A TO263-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,335
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Product details
Overview
AP3003S-3.3TRE1 from BCD Semiconductor is a fixed-output 3.3V, 150kHz PWM buck DC-DC converter in TO-263-5 package, delivering up to 3A load current with ±4% output tolerance, 75% typical efficiency at 12VIN/3A, and integrated thermal shutdown. It serves as the primary step-down regulator in LCD monitor power rails, DVD recorder main supply, and PDP subsystems.
For engineers reviewing the AP3003S-3.3TRE1 datasheet, AP3003S-3.3TRE1 pinout, AP3003S-3.3TRE1 application, or AP3003S-3.3TRE1 equivalent, key selection criteria include guaranteed 3A output capability, TTL-compatible ON/OFF control, low 80µA standby quiescent current, fixed 3.3V output with no external feedback resistors required, and TO-263-5 thermal performance for industrial embedded power designs.
Technical Context
The AP3003S-3.3TRE1 implements a voltage-mode PWM control architecture with internal 150kHz oscillator and built-in error amplifier, reference (1.23V), and driver stage. Its fixed 3.3V output eliminates external resistor divider setup on the FEEDBACK pin, simplifying layout and reducing component count.
It integrates cycle-by-cycle current limiting (typ. 3.4A peak), thermal shutdown at 150°C junction temperature, and logic-level ON/OFF control with 0.6V low-threshold and 2.0V high-threshold. The TO-263-5 package provides enhanced thermal dissipation over TO-220-5, supporting continuous 3A operation without heatsink under moderate ambient conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3V ±4% - Fixed regulation without external feedback network; reduces BOM and layout complexity. |
| Max Output Current | 3A - Guaranteed continuous load delivery; supports high-current digital logic rails and display backlight drivers. |
| Switching Frequency | 150kHz - Enables use of standard, low-cost 22µH power inductors and minimizes EMI filtering requirements. |
| Input Voltage Range | 4.5V to 32V - Compatible with 5V, 12V, and 24V unregulated input sources common in consumer electronics. |
| Efficiency | 75% @ 12VIN/3A - Delivers stable 3.3V output with minimal thermal rise in space-constrained TO-263-5 footprint. |
| Standby Quiescent Current | 80µA typical - Enables ultra-low-power shutdown mode for battery-backed or energy-sensitive systems. |
| Thermal Shutdown | 150°C junction - Self-protecting operation prevents damage during overload or poor heatsinking scenarios. |
Pinout & Package
AP3003S-3.3TRE1 uses the TO-263-5 surface-mount package with exposed metal tab thermally connected to GND, enabling efficient PCB heat spreading. Pin numbering follows top-view orientation with Pin 1 at top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VIN | Unregulated input supply | Accepts 4.5–32V DC; requires local 470µF bulk capacitance for stability and ripple suppression. |
| 2 OUTPUT | Switch node output | Drives external catch diode and LC filter; connects directly to inductor and Schottky diode anode. |
| 3 GND | Power and signal ground | Common return path; metal tab is electrically tied to this pin for thermal and electrical grounding. |
| 4 FEEDBACK | Output voltage sensing | Internally connected to 3.3V reference; shorted to OUTPUT for fixed version-no external resistors needed. |
| 5 ON/OFF | TTL-compatible enable control | Logic-low (≤0.6V) disables regulator; logic-high (≥2.0V) enables operation with 5–15µA input current. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 3.3V output | Eliminates external feedback resistors and capacitor, reducing design time and component cost by ≥2 parts. |
| Integrated current limit & thermal shutdown | Protects against sustained overload and ambient overheating without external circuitry-enables robust field operation. |
| 150kHz fixed-frequency PWM | Allows predictable EMI spectrum placement and compatibility with widely available, optimized 22µH power inductors. |
| TTL-compatible ON/OFF control | Direct interface with microcontroller GPIO pins; supports system-level power sequencing and sleep/wake protocols. |
| Low 80µA standby IQ | Extends battery life in portable or always-on applications where regulator remains powered but inactive. |
Applications
| LCD Monitor Power Supply | DVD Recorder Main Rail |
|---|---|
Use Scenario: Converts 12V unregulated input to stable 3.3V for digital video processing ICs and memory interfaces. IC Role / Device Role / Timing Role: Primary step-down regulator supplying core logic voltage to MPEG decoder, scaler, and frame buffer controllers. Use Value: Delivers clean, regulated 3.3V at full 3A load with <±0.1% line/load regulation-ensures timing margin compliance for DDR SDRAM and LVDS transmitters. |
Use Scenario: Provides 3.3V rail for servo motor control MCU, optical pickup driver, and flash memory controller. IC Role / Device Role / Timing Role: Central DC-DC converter powering real-time control subsystems requiring fast transient response and low noise. Use Value: 150kHz switching frequency avoids interference with audio DAC sampling clocks; 75% efficiency limits thermal impact in sealed chassis. |
| PDP Subsystem Bias | On-Card DC-DC Converter |
Use Scenario: Generates 3.3V bias for plasma display panel gate driver ICs and scan control logic. IC Role / Device Role / Timing Role: High-current auxiliary regulator supporting pulsed gate drive loads with tight voltage accuracy. Use Value: ±4% output tolerance ensures consistent gate threshold margin across operating temperature (−40°C to +125°C). |
Use Scenario: Integrated on motherboard to replace linear regulator for FPGA I/O bank or USB PHY power domain. IC Role / Device Role / Timing Role: Compact, self-contained buck converter minimizing board area and thermal footprint. Use Value: TO-263-5 package enables direct copper pour thermal coupling to inner ground plane-reduces θJA vs. TO-220-5 by ~25%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP1584EN-LF-Z | 3.3V adjustable via external resistors; 1.5MHz switching; 3A rating; requires feedback network. | Better transient response and smaller magnetics, but adds two precision resistors and layout sensitivity. | Choose when board space is critical and higher-frequency EMI filtering is acceptable. |
| LM2678SX-3.3/NOPB | 3.3V fixed; 63kHz switching; 5A rating; larger TO-263-7 package; higher quiescent current (5mA). | Higher current headroom and lower EMI, but reduced efficiency at light loads and larger footprint. | Choose when >3A surge capability is required and lower switching noise is prioritized over size/efficiency. |
Compared with MP1584EN-LF-Z and LM2678SX-3.3/NOPB, AP3003S-3.3TRE1 offers the simplest implementation (no feedback resistors), optimal thermal performance in TO-263-5, and lowest standby IQ-making it ideal for cost-sensitive, thermally constrained consumer power supplies where 150kHz EMI is manageable.
Availability
AP3003S-3.3TRE1 is available at Aetrix Electronics and suitable for LCD monitor power supplies, DVD recorder main rails, and PDP subsystems requiring stable component supply, RoHS-compliant packaging, and tape-and-reel delivery for automated assembly.
Supply support for AP3003S-3.3TRE1 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
BCD Semiconductor Manufacturing Limited is a China-based analog and power IC designer specializing in high-voltage, high-efficiency power management solutions for consumer, industrial, and computing markets.
The AP3003 series targets cost-sensitive, high-volume DC-DC conversion applications-designed to replace linear regulators with minimal external components while maintaining robust thermal and protection features.
FAQ
What is the minimum input voltage required for AP3003S-3.3TRE1 to regulate properly?
The AP3003S-3.3TRE1 requires a minimum input voltage of 4.5V to maintain regulation at full 3A load, per the datasheet's recommended operating conditions. Below this, dropout behavior occurs-output voltage drops linearly with input, and internal circuitry may not sustain stable PWM operation.
Can AP3003S-3.3TRE1 be used with ceramic output capacitors instead of electrolytic?
Yes-AP3003S-3.3TRE1 supports ceramic output capacitors, but total COUT must meet minimum 220µF requirement and ESR must remain ≥5mΩ to ensure loop stability. Use X5R/X7R dielectrics rated for ≥6.3V and verify phase margin with manufacturer's recommended compensation guidelines.
Is the metal tab on the TO-263-5 package electrically connected, and how should it be handled on the PCB?
The metal tab is internally bonded to Pin 3 (GND) and must be soldered to a large, low-thermal-resistance PCB copper pour connected to system ground. This connection is essential for both thermal dissipation and electrical noise control-floating or isolated tabs cause thermal runaway and instability.
Does AP3003S-3.3TRE1 require an external catch diode, and what type is recommended?
Yes-an external Schottky diode is mandatory. The datasheet specifies 1N5822 (3A, 40V, 0.55V VF), but equivalents like SS34 or MBR340 are acceptable if rated ≥3A average current, ≤0.6V forward voltage, and ≥40V PIV. Fast recovery is unnecessary due to 150kHz operation.
AP3003S-3.3TRE1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 5.5V
- Voltage - Input (Max):
- 32V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 3A
- Frequency - Switching:
- 150kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263-5
AP3003S-3.3TRE1 FAQ
1.How can I place an order for AP3003S-3.3TRE1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP3003S-3.3TRE1 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 AP3003S-3.3TRE1 reliable?
The price and inventory of AP3003S-3.3TRE1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP3003S-3.3TRE1 is usually 5 days.
3.What payment methods are accepted for AP3003S-3.3TRE1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP3003S-3.3TRE1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP3003S-3.3TRE1?
AP3003S-3.3TRE1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP3003S-3.3TRE1 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 AP3003S-3.3TRE1?
For technical support, including AP3003S-3.3TRE1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP3003S-3.3TRE1 requirements.
6.How does Aetrix verify that AP3003S-3.3TRE1 is sourced from the original manufacturer or authorized distributors?
All AP3003S-3.3TRE1 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 AP3003S-3.3TRE1 meets industry standards.
7.What is the process for return or replacement of AP3003S-3.3TRE1?
All AP3003S-3.3TRE1 units undergo pre-shipment inspection (PSI). If there is an issue with AP3003S-3.3TRE1, 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 AP3003S-3.3TRE1 part is unused and in its original packaging.
Return procedure for AP3003S-3.3TRE1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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