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Diodes Incorporated AP64303QFVBW-13
- Part No.:
- AP64303QFVBW-13
- Manufacturer:
- Diodes Incorporated
- Package:
- 16-UQFN Exposed Pad
- Datasheet:
-
AP64303QFVBW-13.pdf
- Description:
- IC REG BUCK ADJ 3A U-QFN4040-16
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
AP64303QFVBW-13 from Diodes Incorporated is an AEC-Q100 Grade 1 automotive synchronous buck converter with integrated 120mΩ high-side and 55mΩ low-side MOSFETs, 3.8V–40V input range, 3A continuous output current, and default 500kHz switching frequency. It delivers up to 95% efficiency in enhanced bias mode and supports adjustable VOUT from 0.8V to 36V for infotainment power rails.
For engineers reviewing the AP64303QFVBW-13 datasheet, AP64303QFVBW-13 pinout, AP64303QFVBW-13 application, or AP64303QFVBW-13 equivalent, key selection criteria include automotive-grade thermal performance (−40°C to +125°C TA), internal compensation, pre-biased startup, and PFM/PWM mode selection via MSYNC - all critical for robust DC-DC conversion in ECU and ADAS subsystems.
Technical Context
The AP64303QFVBW-13 implements current-mode control with internal loop compensation, enabling stable regulation across wide output capacitance ranges without external compensation components. Its dual-mode operation (PFM at light load, forced PWM via MSYNC) optimizes efficiency across 0.001A–3A load currents.
It integrates a 4.8V internal LDO regulator powered from VIN or BIAS (≥4.5V), reducing quiescent current to 43μA typical and supporting bias-sourced efficiency enhancement. The device features hiccup-mode OCP, thermal shutdown at +165°C, and ±5% power-good detection with 5MΩ internal pullup.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 3.8V to 40V - supports 12V/24V automotive battery systems with cold-crank margin. |
| Output Current | 3A continuous - sustains full load under worst-case thermal conditions (θJA = 30°C/W on EVM). |
| Switching Frequency | 500kHz default (FS = VCC); programmable 300kHz–2.5MHz - enables optimized size/efficiency tradeoff for 2.2μH–10μH inductors. |
| Feedback Voltage | 0.800V ±12mV - sets precise output regulation with standard resistor divider; supports 0.8V–36V VOUT. |
| Quiescent Current | 43μA typical - enables always-on subsystems (e.g., CAN wake-up circuits) with minimal battery drain. |
| Thermal Rating | AEC-Q100 Grade 1 (−40°C to +125°C TA); TJ max = +150°C - qualified for engine bay and cabin-mounted modules. |
| Protection Features | Hiccup OCP, thermal shutdown (+165°C), soft discharge, pre-biased startup, and ±5% PG detection - ensures fault resilience in unattended automotive operation. |
Pinout & Package
The AP64303QFVBW-13 is housed in a Green U-QFN4040-16/SWP (Type UXB) package with 0.4mm pitch and exposed thermal pad (EPAD) electrically tied to GND for optimal thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BIAS (1) | Bias supply input | Switches internal LDO sourcing from VIN to BIAS when ≥4.5V - reduces IQ and die heating in high-VIN applications. |
| VCC (2) | Internal LDO output | Requires 1μF ceramic bypass to PGND; powers gate drivers and control logic - critical for transient response stability. |
| VIN (3,4) | Main power input | Accepts 3.8V–40V; must be bypassed with bulk + ceramic capacitors - defines input ripple rejection and EMI filtering requirements. |
| BST (5) | Bootstrap supply | Connects 0.1μF+ capacitor between BST and SW - enables high-side nFET drive above VIN; dictates minimum off-time (125ns). |
| SW (6,7) | Power switch node | Drives external LC filter; voltage swings from ~0V to VIN - determines layout routing, parasitic inductance limits, and EMI filter placement. |
| PGND (8,9) | Power ground return | Low-impedance path for high di/dt switch currents - must be connected to EPAD via multiple vias to minimize ground bounce and thermal resistance. |
| EN (10) | Enable control | Logic-level input (1.38V threshold); connects directly to VIN for automatic startup - enables system-level sequencing and sleep/wake control. |
| FS (11) | Frequency select | Resistor-to-GND sets fSW from 300kHz–2.5MHz - allows noise-sensitive designs (e.g., camera modules) to avoid AM band interference. |
| MSYNC (12) | Mode/sync control | Configures PFM (GND), forced PWM (VCC), or external clock sync - essential for multi-rail noise coordination in domain controllers. |
| PG (13) | Open-drain power-good | Active-low flag with 5MΩ internal pullup; asserts after tSS and VOUT within ±5% - used for downstream enable sequencing and fault logging. |
| SS/TR (14) | Soft-start/tracking | Capacitor-to-GND sets ramp time (1.7ms default); supports ratiometric tracking with other rails - prevents inrush current and bus collapse during power-up. |
| FB (15) | Feedback input | Senses VOUT via resistive divider; 0.8V reference - determines output accuracy, load/line regulation, and transient recovery behavior. |
| GND (16) | Analog ground reference | Single-point connection to EPAD - separates analog sensing from noisy power return to maintain feedback accuracy. |
| EPAD | Thermal pad | Must be soldered to PCB GND plane - primary heat path (θJC = 5°C/W); failure to connect causes thermal shutdown at <2A load. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for −40°C to +125°C ambient operation with HBM ±2500V and CDM ±1500V ESD - meets automotive functional safety baseline requirements. |
| Integrated power MOSFETs | 120mΩ high-side + 55mΩ low-side RDS(ON) - eliminates external FETs and gate drivers, reducing BOM count and PCB area by >30% vs discrete solutions. |
| Enhanced bias efficiency mode | Reduces IQ to 43μA and improves full-load efficiency to 95% - extends battery runtime in always-on telematics and gateway modules. |
| Pre-biased output startup | Allows safe turn-on when VOUT is pre-charged (e.g., hot-swap or backup rail scenarios) - prevents reverse current and system reset glitches. |
| Programmable soft-start & tracking | 1.7ms internal default; external capacitor enables adjustable ramp and ratiometric sequencing with multiple AP64303Q devices - ensures controlled power-up of FPGA/DSP core and I/O rails. |
Applications
| Automotive Infotainment | ADAS Camera Power |
|---|---|
Use Scenario: Powering SoC cores, DDR memory, and display interfaces in head-unit and digital cluster systems. IC Role / Device Role / Timing Role: Primary 5V/3.3V/1.8V point-of-load regulator with tight load regulation (<±1%) and fast transient response (<50µs). Use Value: Maintains SoC stability during burst-mode video processing; 95% efficiency minimizes thermal load in sealed enclosures. | Use Scenario: Supplying image sensor and ISP in forward-facing and surround-view cameras. IC Role / Device Role / Timing Role: Noise-sensitive 3.3V rail generator with PFM/PWM mode selection to avoid switching artifacts in analog video paths. Use Value: MSYNC pin enables synchronization to camera pixel clock, eliminating beat frequencies in captured imagery. |
| Body Control Module (BCM) | Telematics Control Unit (TCU) |
Use Scenario: Regulating 5V microcontroller, CAN transceiver, and LIN interface supplies in door modules and lighting controllers. IC Role / Device Role / Timing Role: Always-on buck converter with 43μA IQ and EN-controlled wake-up - supports low-power sleep states per ISO 16750-2. Use Value: Enables 10-year battery life in parked vehicle mode; PG signal triggers MCU wake-up on valid rail establishment. | Use Scenario: Generating 3.3V and 1.2V rails for cellular modem, GNSS receiver, and secure element in connected car gateways. IC Role / Device Role / Timing Role: Dual-rail sequenced supply using SS/TR tracking - ensures modem firmware loads before RF initialization. Use Value: Ratiometric startup prevents brown-out during simultaneous rail ramp-up; AEC-Q100 qualification ensures field reliability over 15-year lifecycle. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4333-AEC1 | 4A rating, 2.2MHz max fSW, no BIAS pin, 30μA IQ | Lacks bias-sourced efficiency boost; higher fSW requires smaller inductors but increases EMI filtering complexity | Preferred for space-constrained 4A designs where ultra-low IQ outweighs bias flexibility |
| TPS543320QPWPRQ1 | 3A, 40V, PMBus interface, external compensation, 15μA IQ | Requires external loop compensation and PMBus infrastructure; adds configurability but increases design effort | Chosen when dynamic configuration (e.g., adaptive VOUT scaling) or telemetry is required |
Compared with MPQ4333-AEC1 and TPS543320QPWPRQ1, the AP64303QFVBW-13 offers unique bias-sourced efficiency optimization and internal compensation - simplifying layout and reducing component count while maintaining AEC-Q100 compliance and 3A capability.
Availability
AP64303QFVBW-13 is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera power, and body control module applications requiring stable component supply, long-term lifecycle support, and AEC-Q100 traceability.
Supply support for AP64303QFVBW-13 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 semiconductor company specializing in discrete, analog, and mixed-signal ICs for automotive, industrial, and consumer markets, with manufacturing certified to IATF 16949.
The AP64303Q belongs to Diodes' automotive-grade power management portfolio, designed specifically for robust, high-efficiency DC-DC conversion in harsh-temperature vehicle subsystems including infotainment, ADAS, and connectivity modules.
FAQ
What is the recommended input capacitor configuration for AP64303QFVBW-13?
A minimum 10μF ceramic input capacitor is required at VIN, supplemented by bulk capacitance (e.g., 47μF–100μF tantalum or aluminum polymer) to handle cold-crank transients. Layout must minimize loop inductance between VIN, PGND, and the input cap - placing the 10μF part within 3mm of pins 3/4 and 8/9 is critical for EMI suppression and stability.
How does the BIAS pin improve efficiency in high-input-voltage applications?
When BIAS is connected to VOUT ≥4.5V, the internal 4.8V LDO draws current from BIAS instead of VIN, reducing power dissipation in the VIN-to-VCC path. At VIN = 36V, this lowers die temperature by up to 15°C and improves full-load efficiency by 1.2% - verified in Figure 8 of DS46204 Rev. 2-2.
Can AP64303QFVBW-13 operate with a pre-biased output during startup?
Yes - the device supports pre-biased output startup without reverse current flow. Internal circuitry disables the low-side MOSFET during soft-start until VOUT reaches ~0.7V, then gradually enables regulation. This prevents output voltage collapse when powering from shared rails or during hot-plug events.
What is the minimum off-time limitation and how does it affect minimum on-time operation?
The AP64303QFVBW-13 has a guaranteed minimum off-time of 125ns (at VFB = 760mV). Combined with its 115ns minimum on-time, this sets the practical lower limit for duty cycle at ~2.3% at 500kHz - enabling VOUT as low as 0.92V from 40V input. For lower VOUT, higher fSW (e.g., 2.2MHz) is recommended to maintain regulation margin.
AP64303QFVBW-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 16-UQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.8V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 36V
- Current - Output:
- 3A
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- U-QFN4040-16/SWP (Type UXB)
AP64303QFVBW-13 FAQ
1.How can I place an order for AP64303QFVBW-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP64303QFVBW-13 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 AP64303QFVBW-13 reliable?
The price and inventory of AP64303QFVBW-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP64303QFVBW-13 is usually 5 days.
3.What payment methods are accepted for AP64303QFVBW-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP64303QFVBW-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP64303QFVBW-13?
AP64303QFVBW-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP64303QFVBW-13 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 AP64303QFVBW-13?
For technical support, including AP64303QFVBW-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP64303QFVBW-13 requirements.
6.How does Aetrix verify that AP64303QFVBW-13 is sourced from the original manufacturer or authorized distributors?
All AP64303QFVBW-13 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 AP64303QFVBW-13 meets industry standards.
7.What is the process for return or replacement of AP64303QFVBW-13?
All AP64303QFVBW-13 units undergo pre-shipment inspection (PSI). If there is an issue with AP64303QFVBW-13, 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 AP64303QFVBW-13 part is unused and in its original packaging.
Return procedure for AP64303QFVBW-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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