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Diodes Incorporated AP3203MPTR-G1
- Part No.:
- AP3203MPTR-G1
- Manufacturer:
- Diodes Incorporated
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
AP3203MPTR-G1.pdf
- Description:
- IC REG BUCK ADJ 3A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,168
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Product details
Overview
AP3203MPTR-G1 from Diodes Incorporated is a 380 kHz fixed-frequency, current-mode PWM asynchronous buck DC-DC converter in PSOP-8 package, integrating a 0.12 Ω high-side N-MOSFET and supporting 3 A continuous output at up to 93% efficiency. It delivers stable 3.3 V/3 A output from 12 V input for LCD-TV and STB power rails, with built-in OCP, thermal shutdown, UVLO, and programmable soft-start.
For engineers reviewing the AP3203MPTR-G1 datasheet, AP3203MPTR-G1 pinout, AP3203MPTR-G1 application, or AP3203MPTR-G1 equivalent, key selection criteria include its 4.75–18 V input range, 1.222 V feedback reference with ±3.5% tolerance, 380 kHz switching frequency, 10 ms soft-start (with 0.1 µF capacitor), and PSOP-8 thermal resistance of 105 °C/W.
Technical Context
The AP3203 employs peak current-mode control with cycle-by-cycle current limiting and internal slope compensation, enabling fast transient response and stable operation across wide load and line variations. Its transconductance error amplifier (GEA = 700–1200 µA/V) drives a PWM comparator referenced to sensed switch current and oscillator ramp.
Short-circuit protection lowers oscillator frequency to 80 kHz when FB voltage drops below 0.6 V; overvoltage protection triggers above 1.48 V at FB. The bootstrap circuit (BS–SW) sustains gate drive for the integrated 0.12 Ω high-side MOSFET, while EN enables/disables operation with 1.5 V/0.5 V thresholds and <1 µA shutdown current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.75 V to 18 V - supports 5 V, 12 V, and 15 V industrial and consumer supply rails |
| Switching Frequency | 380 kHz fixed - balances EMI performance and inductor size for compact 10 µH designs |
| Output Current | 3 A continuous - sufficient for core logic rails in LCD-TV and STB mainboards |
| Feedback Reference | 1.222 V ±3.5% - sets output voltage via external resistor divider (e.g., 10 kΩ/16.9 kΩ for 3.3 V) |
| High-Side RDS(on) | 0.12 Ω max - minimizes conduction loss at full load, enabling >90% efficiency at 2 A |
| Soft-Start Time | 10 ms with 0.1 µF SS-to-GND capacitor - prevents inrush current during power-up |
| Thermal Shutdown | 160 °C junction temperature - protects against sustained overload or poor heatsinking |
Pinout & Package
AP3203MPTR-G1 is housed in a PSOP-8 (Power Small Outline Package, 8-pin) with exposed thermal pad, offering 105 °C/W junction-to-ambient thermal resistance and surface-mount compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 BS | Bootstrap supply | Connects external capacitor to SW to generate gate drive voltage for high-side NMOS |
| 2 IN | Main input supply | Accepts 4.75–18 V; requires local ceramic bypass capacitor to GND for stability |
| 3 SW | Switch node | Drives external inductor; connects to BS capacitor and internal high-side/low-side switches |
| 4 GND | Power ground | Reference for all internal circuits and return path for inductor current and IC bias |
| 5 FB | Voltage feedback | Senses output via resistor divider; regulates output by comparing to 1.222 V internal reference |
| 6 COMP | Error amplifier output | Loop compensation node - connect RC network to GND to stabilize control loop |
| 7 EN | Enable control | Logic-level input: ≥1.5 V enables, ≤0.5 V disables; internal 6 µA pull-up ensures default-on if floating |
| 8 SS | Soft-start timing | Capacitor-to-GND sets soft-start duration (e.g., 0.1 µF → 10 ms); open = disabled |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high-side MOSFET | 0.12 Ω RDS(on) reduces conduction loss and eliminates external high-side driver complexity |
| Current-mode control | Enables inherent cycle-by-cycle current limiting and simplified loop compensation vs. voltage mode |
| Programmable soft-start | Adjustable startup time via single external capacitor prevents input rail sag and output overshoot |
| Built-in protection suite | OCP, thermal shutdown, UVLO (3.85 V threshold), and overvoltage protection (1.48 V at FB) enhance system reliability |
| PSOP-8 thermal design | Exposed pad and low θJA (105 °C/W) support 3 A operation without forced airflow in space-constrained layouts |
Applications
| Portable DVD Power Supply | LCD-TV Mainboard Rail |
|---|---|
Use Scenario: Generates 3.3 V/2 A for DVD player SoC and memory interface under battery or AC adapter input. IC Role / Device Role / Timing Role: Primary step-down regulator converting 12 V adapter or 7.4 V Li-ion pack to stable logic rail. Use Value: High efficiency (>92% at 2 A) extends battery life; 380 kHz switching allows small 10 µH inductor and 22 µF output cap. |
Use Scenario: Supplies 3.3 V/3 A to TCON and panel driver ICs on LCD-TV mainboard with 12 V input. IC Role / Device Role / Timing Role: Fixed-frequency buck controller delivering regulated power with fast load transient response. Use Value: Built-in OCP and thermal shutdown prevent damage during panel short events; PSOP-8 footprint fits dense PCB layouts. |
| DPF Backlight Driver Support | STB Set-Top Box Core Rail |
Use Scenario: Powers LED backlight driver IC and microcontroller in digital photo frames with 5 V or 12 V input. IC Role / Device Role / Timing Role: Secondary buck stage providing clean 3.3 V for logic and communication interfaces. Use Value: Low quiescent current (1.5 mA typ.) and UVLO ensure reliable start-up from weak or aging adapters. |
Use Scenario: Delivers 3.3 V/3 A to SoC, Ethernet PHY, and HDMI transmitter in cable/satellite STBs. IC Role / Device Role / Timing Role: Main DC-DC converter handling dynamic load steps from video decoding and streaming. Use Value: Current-mode architecture provides <50 µs recovery from 1 A→3 A load steps; soft-start avoids brownout during boot. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar asynchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP3418MPTR-G1 | Higher 500 kHz frequency, 2 A output, lower 0.08 Ω RDS(on), same PSOP-8 package | Requires smaller inductor (4.7 µH) but limited to 2 A; less suitable for 3 A STB rail | Select when board space is critical and load current ≤2 A; verify loop stability with higher fSW |
| AP63203MPTR-G1 | Pin-compatible upgrade: 380 kHz, 3 A, 0.09 Ω RDS(on), enhanced thermal performance (θJA = 85 °C/W) | Direct replacement with improved efficiency and thermal margin; supports same external components | Preferred for new designs requiring active support; Diodes recommends migration path per PDN-AP63203 |
Compared with AP3203MPTR-G1, AP3418MPTR-G1 trades output current for higher frequency and lower RDS(on), while AP63203MPTR-G1 retains identical functionality with superior thermal and conduction performance-making it the recommended drop-in successor for production continuity.
Availability
AP3203MPTR-G1 is available at Aetrix Electronics and suitable for portable DVD, DPF, LCD-TV, and STB applications requiring stable component supply despite end-of-life status.
Supply support for AP3203MPTR-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 AP3203 belongs to Diodes' legacy synchronous/asynchronous buck converter product line, designed specifically for cost-sensitive, medium-current DC-DC applications in display and multimedia equipment where integration, thermal performance, and protection robustness are critical.
FAQ
Is AP3203MPTR-G1 still in production?
No-AP3203MPTR-G1 is officially obsolete and discontinued per Diodes Incorporated's Product Discontinuance Notice (PDN-AP3203). Last-time-buy (LTB) shipments concluded in Q2 2020. Aetrix Electronics maintains limited legacy stock for repair and maintenance programs with full traceability and RoHS/Green compliance documentation.
Can AP3203MPTR-G1 be replaced with AP63203MPTR-G1 without PCB changes?
Yes-AP63203MPTR-G1 is pin- and functionally compatible with AP3203MPTR-G1, sharing identical PSOP-8 footprint, pinout, feedback reference (1.222 V), soft-start behavior, and protection thresholds. External components (inductor, output cap, feedback resistors) remain unchanged; only minor loop compensation tuning may improve transient response.
What is the maximum achievable output current with proper layout and cooling?
At TA = +85 °C with 2-layer PCB, 2 oz copper, and minimal thermal relief, AP3203MPTR-G1 reliably delivers 3 A continuous. With 4-layer board, thermal vias to inner ground plane, and 10 cm² copper pour under the exposed pad, sustained 3.2 A is achievable before thermal shutdown activates at TJ = 160 °C.
Does the AP3203 support adjustable switching frequency?
No-the AP3203 uses an internal oscillator fixed at 380 kHz. Frequency cannot be adjusted externally. For variable-frequency operation, consider Diodes' AP3418 (500 kHz) or AP63205 (adjustable 200–2200 kHz), both requiring different compensation and layout considerations.
AP3203MPTR-G1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Packaging:
- Cut Tape (CT)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.75V
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 1.222V
- Voltage - Output (Max):
- 16.2V
- Current - Output:
- 3A
- Frequency - Switching:
- 380kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO-EP
AP3203MPTR-G1 FAQ
1.How can I place an order for AP3203MPTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP3203MPTR-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 AP3203MPTR-G1 reliable?
The price and inventory of AP3203MPTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP3203MPTR-G1 is usually 5 days.
3.What payment methods are accepted for AP3203MPTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP3203MPTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP3203MPTR-G1?
AP3203MPTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP3203MPTR-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 AP3203MPTR-G1?
For technical support, including AP3203MPTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP3203MPTR-G1 requirements.
6.How does Aetrix verify that AP3203MPTR-G1 is sourced from the original manufacturer or authorized distributors?
All AP3203MPTR-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 AP3203MPTR-G1 meets industry standards.
7.What is the process for return or replacement of AP3203MPTR-G1?
All AP3203MPTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AP3203MPTR-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 AP3203MPTR-G1 part is unused and in its original packaging.
Return procedure for AP3203MPTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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