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Diodes Incorporated AP64350SP-13
- Part No.:
- AP64350SP-13
- Manufacturer:
- Diodes Incorporated
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
AP64350SP-13.pdf
- Description:
- IC REG BUCK ADJ 3.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:55,166
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Product details
Overview
AP64350SP-13 from Diodes Incorporated is a 3.5A synchronous buck converter with 3.8V–40V input range, integrated 75mΩ high-side and 45mΩ low-side MOSFETs, 0.8V ±1% reference, programmable 100kHz–2.2MHz switching frequency, and SO-8EP package. It delivers high-efficiency DC-DC conversion in industrial power tools, home appliances, and network systems.
For engineers reviewing the AP64350SP-13 datasheet, AP64350SP-13 pinout, AP64350SP-13 application, or AP64350SP-13 equivalent, key selection criteria include EMI-reduction features (FSS ±6% jitter and ringing-free gate drive), precision enable threshold (1.18V), light-load PFM efficiency (85% at 5mA), and thermal shutdown at +160°C.
Technical Context
The AP64350SP-13 employs fixed-frequency peak current mode control with internal slope compensation to prevent subharmonic oscillation above 50% duty cycle. Its proprietary multi-level gate driver ensures fast MOSFET switching while eliminating SW node ringing-critical for radiated EMI compliance.
It supports dual frequency programming: resistor-timed (RT/CLK to GND) or external clock synchronization (100kHz–2.2MHz). The device enters PFM mode below ~750mA load, clamping COMP voltage and disabling low-side conduction at zero-cross to achieve 22μA quiescent current and 85% efficiency at 5mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.8V to 40V DC - supports direct connection to 5V, 12V, 24V, and 36V industrial bus rails without pre-regulation. |
| Output Current | 3.5A continuous - sustains full rated load at +85°C ambient with SO-8EP thermal pad tied to PCB ground plane. |
| Feedback Reference | 0.8V ±1% - enables precise output regulation (e.g., 5V via 115kΩ/22.1kΩ divider) across temperature and line variations. |
| Quiescent Current | 22μA typical (PFM, no load) - extends battery life in always-on subsystems and low-power standby modes. |
| Switching Frequency | Programmable 100kHz–2.2MHz - allows trade-off between inductor size (higher fSW → smaller L) and efficiency (lower fSW → lower switching loss). |
| EMI Reduction | FSS ±6% jitter + ringing-free gate drive - reduces peak radiated emissions by spreading energy across bandwidth and suppressing >100MHz harmonics. |
| Protection Features | UVLO (3.5V rising), OVP (10% overregulation), cycle-by-cycle OCP (5.75A peak), thermal shutdown (+160°C) - ensures robust operation under fault conditions. |
Pinout & Package
AP64350SP-13 is housed in an SO-8EP (exposed pad) package with 9 terminals: 8 perimeter pins plus thermally enhanced exposed pad (Pin 9), which must be soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST (Pin 1) | High-side gate drive boost supply | Requires 100nF ceramic capacitor from BST to SW to sustain gate voltage during high-side conduction; enables efficient 75mΩ MOSFET drive. |
| VIN (Pin 2) | Main power input | Accepts 3.8V–40V; must be bypassed with ≥10µF low-ESR capacitor to suppress switching noise and support peak current demands. |
| EN (Pin 3) | Enable control with UVLO programming | Logic-high threshold = 1.18V; internal 1.5µA pullup enables auto-start when floating; external resistor divider adjusts VIN UVLO thresholds. |
| RT/CLK (Pin 4) | Frequency programming interface | Configures oscillator via RT resistor (100kHz–2.2MHz) or accepts external clock signal; PLL synchronizes internal timing to external source. |
| FB (Pin 5) | Output voltage feedback sense | Compares resistive divider output against 0.8V reference; sets regulated VOUT with ±1% accuracy over temperature and line. |
| COMP (Pin 6) | Loop compensation node | Connects external RC network to stabilize control loop; determines phase margin and transient response for specific LC filter design. |
| GND (Pin 7) | Power ground reference | Common return for VIN, SW, BST, EN, RT/CLK, FB, COMP; must be low-impedance path to minimize noise coupling. |
| SW (Pin 8) | Switching node output | Drives external inductor; high dv/dt node requiring tight layout and minimized parasitic inductance to reduce EMI. |
| EXPOSED PAD (Pin 9) | Thermal and electrical ground | Must be soldered to ≥200mm² internal/external GND copper area; reduces θJA to 45°C/W and prevents thermal shutdown under full load. |
Key Features
| Feature | Design Value |
|---|---|
| Proprietary ringing-free gate driver | Eliminates SW node oscillation >100MHz without degrading MOSFET turn-on/turn-off times - directly reduces Class B radiated EMI test failures. |
| Frequency Spread Spectrum (FSS) | ±6% switching frequency jitter spreads conducted/radiated noise over 120kHz bandwidth - lowers peak EMI by 5–10dB compared to fixed-frequency operation. |
| Low-dropout (LDO) mode | Enables regulation down to VOUT = VIN − 0.3V during startup or overload - maintains output stability during input brownouts or heavy transient loads. |
| Precision enable threshold | 1.18V logic-high threshold with 400mV hysteresis - allows accurate power-rail sequencing and configurable UVLO using external resistive dividers. |
| Zero-cross detection | Disables low-side MOSFET when inductor current reaches 0A in PFM - prevents reverse current flow and improves light-load efficiency to 85% at 5mA. |
Applications
| Power Tools | Home Audio Systems |
|---|---|
|
Use Scenario: 18V/24V cordless drill or impact driver with digital motor control and LED status display. IC Role / Device Role / Timing Role: Primary 5V/3.3V point-of-load regulator supplying MCU, gate drivers, and sensors from battery pack. Use Value: High input range (3.8V–40V) accommodates fully charged Li-ion (25.2V) and depleted state (~15V); FSS and ringing-free drive meet IEC 55014-1 EMC limits. |
Use Scenario: Multi-channel amplifier with DSP, DAC, and analog front-end requiring clean, low-noise 5V and ±12V rails. IC Role / Device Role / Timing Role: Main 5V buck supply for digital subsystem; paired with LDOs for analog sections. Use Value: 0.8V ±1% reference and <10mV load regulation ensure stable ADC/DAC reference; 22μA IQ minimizes idle power in standby mode. |
| Network Routers | White Goods Control Boards |
|
Use Scenario: 12V-powered enterprise router with PoE midspan, multiple Ethernet PHYs, and wireless SoC. IC Role / Device Role / Timing Role: Secondary 3.3V/1.8V regulator for PHY interface and memory subsystem. Use Value: Programmable 100kHz–2.2MHz frequency avoids noise coupling into 2.4GHz/5GHz RF bands; SO-8EP package supports compact 4-layer PCB layout. |
Use Scenario: Smart refrigerator control board managing compressor, displays, and IoT connectivity. IC Role / Device Role / Timing Role: Main 5V supply for microcontroller, touch panel, and Wi-Fi module. Use Value: Thermal shutdown (+160°C) and hiccup-mode OCP protect against sustained overloads in enclosed cabinets; automotive-grade variant (AP64350Q) available for extended temp validation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2451DT-LF-Z (Monolithic Power) | 3A rating, 4.5V–36V input, fixed 2MHz fSW, no FSS or ringing suppression, 30μA IQ | Lacks EMI-specific features; requires external snubber or layout mitigation for Class B compliance | Choose for cost-sensitive, non-EMI-critical 3A designs where fixed 2MHz simplifies inductor selection. |
| TPS54332DR (Texas Instruments) | 3.5A, 3.5V–28V input, 100kHz–2.5MHz programmable fSW, no FSS, 125μA IQ, external MOSFETs | Higher IQ reduces light-load efficiency; discrete FETs increase BOM count and layout complexity | Prefer when input voltage is capped at 28V and design requires TI's WEBENCH integration or higher thermal margin via external FETs. |
Compared with MP2451DT-LF-Z and TPS54332DR, the AP64350SP-13 uniquely combines 40V input tolerance, integrated EMI reduction (FSS + ringing-free drive), and ultra-low 22μA IQ - making it optimal for industrial 24V/36V systems requiring certified EMC performance and long standby life.
Availability
AP64350SP-13 is available at Aetrix Electronics and suitable for power tools, home audio systems, and network routers requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for AP64350SP-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 power management, signal integrity, and protection applications.
The AP64350SP-13 belongs to Diodes' high-voltage synchronous buck converter product line, engineered for EMI-sensitive industrial and consumer applications requiring wide-input operation, low IQ, and robust protection.
FAQ
What is the minimum recommended input voltage for reliable startup?
The AP64350SP-13 has a guaranteed undervoltage lockout (UVLO) rising threshold of 3.5V and hysteresis of 400mV. Reliable startup occurs when VIN exceeds 3.7V, and the device remains enabled down to 3.3V before shutting off. For applications with weak sources, the EN pin can be configured with an external resistor divider to raise the effective UVLO threshold.
How does the Frequency Spread Spectrum (FSS) function affect EMI testing?
FSS introduces ±6% jitter on the switching frequency, spreading radiated and conducted noise energy across a wider bandwidth instead of concentrating at harmonics of a fixed fSW. This reduces peak emission amplitudes by 5–10dB in standard CISPR 22/32 tests, often eliminating the need for additional ferrite beads or shielding in Class B environments.
Can the AP64350SP-13 operate in forced PWM mode at all load levels?
No - the AP64350SP-13 automatically transitions from forced PWM to PFM mode below ~750mA load. In PFM, it disables low-side conduction at zero-cross and clamps COMP voltage to maintain regulation while reducing switching losses. Forced PWM is not user-selectable; the mode transition is internal and optimized for efficiency across the full 0–3.5A range.
What is the role of the EXPOSED PAD in thermal management?
The EXPOSED PAD (Pin 9) serves as the primary thermal dissipation path and must be soldered to a solid GND copper plane. With proper PCB layout (≥200mm² thermal pad area, 4-layer board, 2oz copper), it achieves θJA = 45°C/W - enabling full 3.5A output at +85°C ambient without derating. Electrical grounding of the pad is mandatory for both thermal performance and functional stability.
AP64350SP-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:
- 100kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO-EP
AP64350SP-13 FAQ
1.How can I place an order for AP64350SP-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP64350SP-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 AP64350SP-13 reliable?
The price and inventory of AP64350SP-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP64350SP-13 is usually 5 days.
3.What payment methods are accepted for AP64350SP-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP64350SP-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP64350SP-13?
AP64350SP-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP64350SP-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 AP64350SP-13?
For technical support, including AP64350SP-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP64350SP-13 requirements.
6.How does Aetrix verify that AP64350SP-13 is sourced from the original manufacturer or authorized distributors?
All AP64350SP-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 AP64350SP-13 meets industry standards.
7.What is the process for return or replacement of AP64350SP-13?
All AP64350SP-13 units undergo pre-shipment inspection (PSI). If there is an issue with AP64350SP-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 AP64350SP-13 part is unused and in its original packaging.
Return procedure for AP64350SP-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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