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Diodes Incorporated AP3211HK-G1
- Part No.:
- AP3211HK-G1
- Manufacturer:
- Diodes Incorporated
- Package:
- SOT-23-6
- Datasheet:
-
AP3211HK-G1.pdf
- Description:
- IC REG BUCK ADJ 1.5A SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,562
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Product details
Overview
AP3211HK-G1 from BCD Semiconductor is a 1.4MHz fixed-frequency, current-mode asynchronous buck DC-DC converter with integrated 0.385Ω N-channel MOSFET, delivering up to 1.5A output current across 4.5V–23V input range and regulating output voltage via 0.81V feedback reference. It features built-in soft-start, thermal shutdown, UVLO, overvoltage protection, and cycle-by-cycle current limiting-designed for compact, high-efficiency power supplies in LCD TV and portable DVD systems.
For engineers reviewing the AP3211HK-G1 datasheet, AP3211HK-G1 pinout, AP3211HK-G1 application, or AP3211HK-G1 equivalent, key selection criteria include bootstrap-based high-side gate drive capability, 1.4MHz/460kHz dual-frequency operation under fault conditions, 92% peak efficiency at 1.5A, and SOT-23-6 package compatibility with standard external inductors.
Technical Context
The AP3211HK-G1 implements current-mode PWM control with internal ramp generation and error amplifier comparing 0.81V reference against FB voltage. Its oscillator operates at 1.4MHz under normal conditions and auto-scales to 460kHz during short-circuit events to reduce stress and improve recovery.
Bootstrap-driven high-side NMOS switching enables efficient step-down conversion without requiring a dedicated gate driver IC. The device integrates all protection functions-including overcurrent (1.8–2.4A limit), thermal shutdown (160°C trigger), and UVLO (3.3–4.3V rising threshold with 0.2V hysteresis)-within a single SOT-23-6 die.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.4 MHz nominal; drops to 460 kHz during short circuit for safe recovery |
| Output Current | 1.5 A continuous; supports transient loads up to 2.4 A before current-limit activation |
| Feedback Reference | 0.81 V ±2.5%; sets regulated output via external resistor divider on FB pin |
| MOSFET RDS(on) | 0.385 Ω typical; reduces conduction loss and improves efficiency above 1A load |
| Input Voltage Range | 4.5 V to 23 V; accommodates wide-input industrial and consumer DC rails |
| Soft-start Time | 200 µs; prevents inrush current and stabilizes startup into capacitive loads |
| Quiescent Current | 1.1 mA typical at VFB=0.9V; enables low-noise operation in standby-sensitive designs |
Pinout & Package
SOT-23-6 package with exposed pad for thermal enhancement; 2.95 mm × 2.82 mm footprint, 1.45 mm max height, RoHS-compliant green finish (G1 suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BS | Bootstrap supply node | Connects external capacitor to SW to generate gate drive voltage > VIN for high-side NMOS |
| GND | Power and signal ground | Common return path for internal regulators, feedback amplifier, and switch current sensing |
| FB | Voltage feedback input | Monitors output via resistor divider; triggers OVP if >0.972 V or SC protection if <0.25 V |
| EN | Enable control input | Active-high logic: ≥1.5 V enables operation; ≤0.4 V disables IC with <1 µA shutdown current |
| IN | Main power input | Accepts 4.5–23 V; requires local ceramic bypass capacitor to suppress high-frequency ripple |
| SW | Power switch output | Drives external inductor; connects to BS capacitor and Schottky catch diode anode |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high-side NMOS | 0.385 Ω RDS(on) eliminates need for external high-side driver and reduces BOM count |
| Current-mode control | Enables fast load transient response and inherent cycle-by-cycle current limiting |
| Dual-frequency operation | 1.4 MHz normal mode ensures small magnetics; 460 kHz fault mode lowers switching loss during overload |
| Comprehensive protection suite | Includes UVLO, thermal shutdown (160°C), OVP, SCP, and soft-start-all implemented on-die |
| Green RoHS-compliant packaging | G1 suffix denotes lead-free, halogen-free SOT-23-6 with JEDEC-standard reflow profile |
Applications
| LCD TV Power Rail | Portable DVD Player |
|---|---|
Use Scenario: Supplies stable 3.3V rail to main SoC and display interface in 19–24 inch LCD TVs. IC Role / Device Role / Timing Role: Primary buck regulator converting 12V DC input to regulated 3.3V at up to 1.5A. Use Value: High 92% efficiency minimizes heat buildup in sealed chassis; 1.4MHz switching allows use of compact 4.7µH inductor. | Use Scenario: Powers video decoder, LCD backlight controller, and USB PHY in battery-powered DVD players. IC Role / Device Role / Timing Role: Main system regulator stepping down 7.4V Li-ion battery pack to 3.3V logic rail. Use Value: Wide 4.5–23V input range accommodates full battery discharge curve; UVLO prevents deep discharge damage. |
| Digital Photo Frame | Set-Top Box Auxiliary Supply |
Use Scenario: Generates clean 3.3V supply for ARM Cortex-M microcontroller and SD card interface in photo frames. IC Role / Device Role / Timing Role: Standby-capable buck converter enabling quick wake-up from ultra-low-power sleep mode. Use Value: 0.1 µA shutdown current extends battery life; EN pin allows MCU-controlled power sequencing. | Use Scenario: Provides isolated 3.3V auxiliary rail for HDMI CEC, IR receiver, and Ethernet PHY in STB designs. IC Role / Device Role / Timing Role: Secondary regulator fed from main 12V SMPS output, decoupled from noisy digital domains. Use Value: Integrated OVP and thermal shutdown ensure reliability in thermally constrained enclosures with limited airflow. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP1472GJ-Z | Higher 2A rating, 1.2MHz fixed frequency, no integrated bootstrap diode; requires external bootstrap capacitor | Supports higher output current but lacks AP3211HK-G1's 460kHz fault-mode scaling | Choose when >1.5A load headroom is required and board space permits larger external components |
| TPS54202DRCT | 2A synchronous buck, 400kHz–2.5MHz adjustable frequency, integrated low-side FET, no bootstrap requirement | Higher efficiency at light loads due to synchronous rectification; different pinout and compensation scheme | Prefer for designs prioritizing light-load efficiency and simplified layout over cost-sensitive discrete solutions |
Compared with MP1472GJ-Z and TPS54202DRCT, the AP3211HK-G1 offers lower BOM cost via integrated high-side FET and bootstrap circuitry, simpler design with fixed 1.4MHz frequency, and unique dual-frequency fault response-making it optimal for cost-constrained, space-limited consumer power supplies where 1.5A output suffices.
Availability
AP3211HK-G1 is available at Aetrix Electronics and suitable for LCD TV, portable DVD, and digital photo frame designs requiring stable component supply, consistent parametric performance, and long-term production availability.
Supply support for AP3211HK-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
BCD Semiconductor Manufacturing Limited is a Shanghai-based analog and power IC designer specializing in high-voltage, high-efficiency power management solutions for consumer, industrial, and automotive markets.
The AP3211HK-G1 belongs to BCD's AP32xx series of integrated buck converters, engineered specifically for cost-sensitive, high-volume consumer electronics needing compact, robust, and easy-to-design DC-DC regulation.
FAQ
What is the minimum input voltage required for reliable startup?
The AP3211HK-G1 incorporates an undervoltage lockout (UVLO) circuit that activates at 3.3V (rising threshold) with 0.2V hysteresis. Reliable startup occurs only when input voltage exceeds 3.8V, ensuring stable internal biasing and gate drive before enabling the power switch.
Can the AP3211HK-G1 operate without an external bootstrap capacitor?
No. The BS pin requires a 10nF ceramic capacitor connected between BS and SW to charge the internal high-side gate driver. Omitting this capacitor prevents proper turn-on of the integrated N-channel MOSFET and results in no output regulation or potential device latch-up.
How does the device respond during output short-circuit conditions?
Under short-circuit, the AP3211HK-G1 detects low FB voltage (<0.25V), reduces switching frequency from 1.4MHz to 460kHz, limits peak current to ~2A, and enters hiccup mode-cycling on/off with 200µs soft-start each attempt-until fault clears, preventing thermal runaway.
Is the feedback reference voltage affected by temperature?
Yes-the 0.81V reference exhibits ±15mV drift over –40°C to +85°C ambient, as shown in Figure 6 of the datasheet. This corresponds to ±1.85% variation, which must be factored into resistor divider tolerance selection to maintain output accuracy across temperature.
AP3211HK-G1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tube
- 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):
- 23V
- Voltage - Output (Min/Fixed):
- 0.81V
- Voltage - Output (Max):
- 20.7V
- Current - Output:
- 1.5A
- Frequency - Switching:
- 1.4MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
AP3211HK-G1 FAQ
1.How can I place an order for AP3211HK-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP3211HK-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 AP3211HK-G1 reliable?
The price and inventory of AP3211HK-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP3211HK-G1 is usually 5 days.
3.What payment methods are accepted for AP3211HK-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP3211HK-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP3211HK-G1?
AP3211HK-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP3211HK-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 AP3211HK-G1?
For technical support, including AP3211HK-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP3211HK-G1 requirements.
6.How does Aetrix verify that AP3211HK-G1 is sourced from the original manufacturer or authorized distributors?
All AP3211HK-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 AP3211HK-G1 meets industry standards.
7.What is the process for return or replacement of AP3211HK-G1?
All AP3211HK-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AP3211HK-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 AP3211HK-G1 part is unused and in its original packaging.
Return procedure for AP3211HK-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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