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Diodes Incorporated AP64351QSP-13
- Part No.:
- AP64351QSP-13
- Manufacturer:
- Diodes Incorporated
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
AP64351QSP-13.pdf
- Description:
- IC REG BUCK ADJ 3.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:24,219
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Product details
Overview
AP64351QSP-13 from Diodes Incorporated is an AEC-Q100 Grade 1 automotive synchronous buck converter with integrated 75mΩ high-side and 45mΩ low-side MOSFETs, 3.8V–40V input range, 3.5A continuous output, and 570kHz fixed-frequency operation. It delivers regulated 0.8V ±1% reference voltage with programmable soft-start and operates in PFM mode down to 22μA quiescent current for automotive infotainment and instrument cluster power rails.
For engineers reviewing the AP64351QSP-13 datasheet, AP64351QSP-13 pinout, AP64351QSP-13 application, or AP64351QSP-13 equivalent, key selection criteria include EMI-reduction features (ringing-free gate drive + ±6% FSS), precision enable threshold (1.18V), cycle-by-cycle OCP, thermal shutdown at +160°C, and SO-8EP package thermal resistance (θJA = 45°C/W).
Technical Context
The AP64351QSP-13 uses peak current mode control with internal 570kHz oscillator and slope compensation to prevent subharmonic oscillation above 50% duty cycle. Its proprietary multi-level gate driver suppresses switching node ringing without degrading rise/fall times, directly reducing high-frequency radiated EMI.
It supports dual operating modes: forced PWM under heavy load and PFM at light load (down to 5mA), achieving up to 85% efficiency with 750mA PFM peak current limit and zero-cross detection that disables low-side conduction when inductor current reaches 0A.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 3.8V to 40V DC - supports direct connection to 12V/24V automotive battery rails with cold-crank tolerance. |
| Output Current | 3.5A continuous - sustains full load across -40°C to +125°C ambient with proper PCB thermal layout. |
| Feedback Voltage | 0.800V ±1% - enables precise output regulation (e.g., 5.0V via 115kΩ/22.1kΩ divider) over temperature. |
| Switching Frequency | 570kHz typical - balances size of external LC filter and EMI performance; ±6% FSS spreads spectral energy. |
| Quiescent Current | 22μA in PFM no-load - minimizes standby power loss in always-on vehicle modules. |
| RDS(ON) HS / LS | 75mΩ / 45mΩ - integrated MOSFETs reduce BOM count and conduction losses at 3.5A output. |
| Soft-Start Time | Programmable via CSS capacitor (e.g., 2ms with 10nF) - prevents inrush current and output overshoot during power-up. |
| Thermal Shutdown | +160°C with +25°C hysteresis - protects die during overload or poor heatsinking; auto-recovery at +135°C. |
Pinout & Package
AP64351QSP-13 is housed in a thermally enhanced SO-8EP (exposed pad) package. The exposed thermal pad (Pin 9) must be soldered to a PCB ground plane for optimal thermal performance (θJC = 5°C/W, θJA = 45°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST (1) | High-side gate drive boost supply | Requires 100nF ceramic capacitor from BST to SW to sustain high-side MOSFET drive during 100% duty cycle. |
| VIN (2) | Main power input | Accepts 3.8V–40V; must be bypassed with ≥2×10µF low-ESR capacitors near IC for EMI suppression and transient response. |
| EN (3) | Enable control with UVLO programming | Logic-high threshold = 1.18V; internal 1.5μA pull-up allows floating EN startup; external resistor divider adjusts VIN UVLO. |
| SS (4) | Soft-start timing control | Internal 4μA current source charges external CSS capacitor; time = 4μA × CSS (e.g., 10nF → 2ms). |
| FB (5) | Output voltage feedback sensing | Compares resistive divider output against 0.8V reference; sets VOUT = 0.8V × (1 + R1/R2). |
| COMP (6) | Loop compensation node | Connects external RC network (e.g., 14kΩ + 3.3nF) to stabilize control loop across line/load transients. |
| GND (7) | Power ground reference | Common return for VIN, SW, FB, COMP, SS, EN; must connect directly to exposed pad for low-impedance path. |
| SW (8) | Switching node output | Drives external inductor; fast-edge transitions require tight layout to minimize EMI; connects to BST capacitor. |
| EXPOSED PAD (9) | Thermal and electrical ground | Must be soldered to ≥2-layer GND plane; provides primary heat dissipation path and reduces thermal resistance. |
Key Features
| Feature | Design Value |
|---|---|
| EMI-optimized gate driver | Ringing-free SW node achieved via multi-level drive without sacrificing slew rate or efficiency - reduces radiated emissions pass/fail margin. |
| Frequency Spread Spectrum (FSS) | ±6% switching frequency jitter spreads conducted/radiated noise over 34kHz bandwidth - lowers peak EMI by >10dB at fundamental frequency. |
| AEC-Q100 Grade 1 qualification | -40°C to +125°C TA operation with HBM ±2kV / CDM ±500V ESD rating - meets automotive reliability requirements for front-end electronics. |
| Low-dropout (LDO) mode | Enables regulation at VIN < VOUT + (IOUT × RDS(ON)HS) - maintains output during low-input transients like cold crank (VIN ≥ 3.8V). |
| Precision enable threshold | 1.18V rising threshold with 1.09V falling threshold - allows accurate sequencing and custom UVLO via external resistor divider on EN pin. |
| Cycle-by-cycle OCP | 4.2A–6.5A programmable peak current limit with hiccup-mode recovery after 512 consecutive trips - prevents MOSFET failure during short-circuit events. |
Applications
| Automotive Infotainment Power Supply | Instrument Cluster Core Rail |
|---|---|
|
Use Scenario: Powers SoC, display controller, and audio codec in head-unit systems requiring stable 5V/3.3V rails amid battery voltage fluctuations. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering 3.5A at 5V with programmable soft-start to coordinate with MCU boot sequence. Use Value: FSS + ringing-free SW node ensures CISPR-25 Class 5 compliance; 22μA IQ extends battery life in accessory-off state. |
Use Scenario: Supplies microcontroller, CAN transceiver, and TFT backlight driver in digital instrument clusters with strict EMI limits. IC Role / Device Role / Timing Role: High-efficiency step-down converter operating from 12V battery; LDO mode sustains output during cranking (VIN dip to 6V). Use Value: AEC-Q100 Grade 1 rating guarantees operation at +125°C ambient; thermal shutdown + OVP protect against fault conditions. |
| Telematics Control Unit (TCU) PMIC | ADAS Camera Module Power |
|
Use Scenario: Generates core 1.2V/1.8V rails for LTE/GNSS processors and memory in connected vehicle telematics units. IC Role / Device Role / Timing Role: Secondary buck stage following upstream 12V-to-5V conversion; uses FB divider and COMP network for tight regulation. Use Value: Programmable soft-start prevents bus collapse when multiple regulators power up simultaneously; PFM mode cuts idle power. |
Use Scenario: Provides clean 3.3V power to image sensor and ISP in rear-view or surround-view camera modules. IC Role / Device Role / Timing Role: Point-of-load regulator with low-noise PFM operation and fast load transient response (<500μs recovery). Use Value: Output OVP clamps overshoot to +5% during load dump; exposed pad ensures thermal stability in sealed housing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4433-AEC1 | 4.5V–40V input, 3.5A, 500kHz, integrated MOSFETs (65mΩ/35mΩ), but lacks FSS and programmable soft-start. | Valid for non-EMI-critical automotive modules; requires external EMI filters where AP64351QSP-13 achieves compliance with minimal externals. | Choose MPQ4433-AEC1 only if FSS and soft-start programmability are not required and cost is prioritized. |
| TPS54332-Q1 | 3.5V–28V input, 3.5A, 600kHz, external MOSFETs required, no integrated gate driver optimization for ringing suppression. | Suitable for lower-voltage 12V-only systems; demands more board space and design effort for EMI mitigation and thermal management. | Select TPS54332-Q1 when input never exceeds 28V and discrete FET selection is needed for specific RDS(ON)/Qg trade-offs. |
Compared with MPQ4433-AEC1 and TPS54332-Q1, AP64351QSP-13 uniquely integrates EMI-reduction features (FSS + ringing-free gate drive) and AEC-Q100-compliant thermal protection in a single SO-8EP package, reducing system-level validation effort for demanding automotive applications.
Availability
AP64351QSP-13 is available at Aetrix Electronics and suitable for automotive infotainment, instrument cluster, and telematics applications requiring stable component supply, AEC-Q100 compliance, and production-ready EMI performance.
Supply support for AP64351QSP-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 manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and protection solutions for automotive and industrial markets.
The AP64351QSP-13 belongs to Diodes' automotive-grade synchronous buck converter product line, designed specifically to meet stringent EMI, thermal, and functional safety requirements of modern vehicle electronic control units.
FAQ
What is the minimum input voltage required for AP64351QSP-13 to start switching?
The AP64351QSP-13 has a power-on reset (POR) threshold of 3.5V (typical) and undervoltage lockout (UVLO) falling threshold of 3.1V. It begins switching once VIN rises above 3.5V and remains active until VIN drops below 3.1V. The EN pin can be used to raise this effective UVLO threshold using an external resistor divider.
How does the AP64351QSP-13 achieve EMI reduction without external components?
The AP64351QSP-13 reduces EMI through two integrated techniques: a proprietary multi-level gate driver that eliminates switching-node ringing while preserving edge speed, and Frequency Spread Spectrum (FSS) with ±6% jitter that disperses spectral energy. Together, they lower peak radiated emissions without requiring ferrite beads or additional shielding.
Can AP64351QSP-13 operate with an input voltage below 3.8V?
No - the absolute minimum recommended input voltage is 3.8V per datasheet specifications. Operation below this risks instability, reduced efficiency, or failure to regulate. During cold-crank events where battery dips to ~6V, the device remains functional; however, sub-3.8V inputs are outside guaranteed operating conditions and may cause undefined behavior.
What thermal design guidelines apply to the SO-8EP package?
The SO-8EP package requires the exposed thermal pad (Pin 9) to be soldered to a minimum 2-layer PCB ground plane with ≥4 thermal vias (0.3mm diameter) connecting to inner ground layers. Recommended copper area is ≥100mm². With this layout, θJA is 45°C/W, enabling 3.5A continuous operation at +125°C ambient when derated per power dissipation calculations.
AP64351QSP-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width) 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):
- 40V
- Current - Output:
- 3.5A
- Frequency - Switching:
- 570kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO-EP
AP64351QSP-13 FAQ
1.How can I place an order for AP64351QSP-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP64351QSP-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 AP64351QSP-13 reliable?
The price and inventory of AP64351QSP-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP64351QSP-13 is usually 5 days.
3.What payment methods are accepted for AP64351QSP-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP64351QSP-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP64351QSP-13?
AP64351QSP-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP64351QSP-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 AP64351QSP-13?
For technical support, including AP64351QSP-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP64351QSP-13 requirements.
6.How does Aetrix verify that AP64351QSP-13 is sourced from the original manufacturer or authorized distributors?
All AP64351QSP-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 AP64351QSP-13 meets industry standards.
7.What is the process for return or replacement of AP64351QSP-13?
All AP64351QSP-13 units undergo pre-shipment inspection (PSI). If there is an issue with AP64351QSP-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 AP64351QSP-13 part is unused and in its original packaging.
Return procedure for AP64351QSP-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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