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Diodes Incorporated AP64351SP-13
- Part No.:
- AP64351SP-13
- Manufacturer:
- Diodes Incorporated
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
AP64351SP-13.pdf
- Description:
- IC REG BUCK ADJ 3.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:28,827
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Product details
Overview
AP64351SP-13 from Diodes Incorporated is a 3.5A synchronous buck DC-DC converter with 3.8V–40V input range, integrated 75mΩ high-side and 45mΩ low-side MOSFETs, 570kHz fixed-frequency operation, programmable soft-start, and proprietary EMI-reduction gate driver. It delivers regulated 0.8V ±1% reference output in distributed power bus supplies for industrial and consumer systems.
For engineers reviewing the AP64351SP-13 datasheet, AP64351SP-13 pinout, AP64351SP-13 application, or AP64351SP-13 equivalent, key selection criteria include its 22µA quiescent current in PFM mode, ±6% frequency spread spectrum for EMI compliance, precision 1.18V enable threshold for UVLO programming, and SO-8EP thermal performance (θJA = 45°C/W).
Technical Context
The AP64351SP-13 employs peak current mode control with internal 570kHz oscillator and slope compensation to ensure stability at >50% duty cycles. Its feedback loop uses a 0.8V reference and error amplifier driving the COMP pin for voltage regulation across 0.8V–39V output range.
EMI mitigation combines two hardware-level techniques: a multi-level gate driver that suppresses switching-node ringing without degrading edge rates, and Frequency Spread Spectrum (FSS) with ±6% jitter to disperse spectral energy-both confirmed in functional block diagram and typical performance curves.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 3.8V to 40V DC - supports direct connection to 5V/12V/24V industrial buses without pre-regulation. |
| IOUT Max | 3.5A continuous - sufficient for point-of-load conversion in power tools and network systems. |
| fSW | 570kHz typical - enables compact LC filter design with ≤5.5μH inductors per typical application circuit. |
| IQ (PFM) | 22µA typical - sustains >85% efficiency at 5mA load, critical for always-on subsystems. |
| VFB Accuracy | 0.8V ±1% - ensures ±10mV output tolerance at 5V setting, reducing need for post-regulation trimming. |
| RDS(ON) HS/Low-Side | 75mΩ / 45mΩ - minimizes conduction loss at full load, validated by thermal resistance (θJC = 5°C/W). |
| Soft-Start | Programmable via CSS capacitor - 2ms typical with 10nF, preventing inrush current in multi-rail sequencing. |
Pinout & Package
AP64351SP-13 is housed in an SO-8EP package with exposed thermal pad (Pin 9), optimized for PCB heat dissipation and EMI reduction. The package meets RoHS 3, halogen-free, and lead-free requirements per Diodes Incorporated standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST (1) | High-side gate drive boost supply | Requires 100nF BST-to-SW capacitor to sustain gate voltage during high-side conduction; enables 75mΩ RDS(ON) performance. |
| VIN (2) | Main power input | Accepts 3.8V–40V; must be bypassed to GND with ≥10µF ceramic capacitor to stabilize switching transients. |
| EN (3) | Enable control with UVLO programming | 1.18V logic-high threshold; internal 1.5µA pullup allows floating startup; external resistor divider adjusts VIN UVLO. |
| SS (4) | Soft-start timing node | 4µA internal current source charges external capacitor; sets ramp time to prevent output overshoot and inrush. |
| FB (5) | Output voltage feedback | Connects to resistive divider; 0.8V reference enables precise VOUT setting (e.g., 5V with 115kΩ/22.1kΩ divider). |
| COMP (6) | Loop compensation node | External RC network (e.g., 14kΩ + 3.3nF) stabilizes control loop; required for transient response tuning. |
| GND (7) | Power ground reference | Common return for VIN, SW, and EXPOSED PAD; must be low-impedance plane for EMI and thermal performance. |
| SW (8) | Switching node output | Drives external inductor; high dv/dt node requiring tight layout; connects to BST capacitor and LC filter. |
| EXPOSED PAD (9) | Thermal and electrical ground path | Must be soldered to PCB ground plane; provides primary heat dissipation path (θJC = 5°C/W). |
Key Features
| Feature | Design Value |
|---|---|
| Proprietary gate driver | Eliminates switching-node ringing while preserving fast rise/fall times - directly reduces high-frequency radiated EMI without efficiency penalty. |
| Frequency Spread Spectrum (FSS) | ±6% switching frequency jitter spreads conducted/radiated noise over wider bandwidth - verified in EMI test data and Figure 4–22 performance plots. |
| Low-dropout (LDO) mode | Enables regulation near VIN–VOUT dropout limit - maintains output stability during brown-out conditions down to 3.5V VIN. |
| Precision enable threshold | 1.18V ±70mV rising threshold - allows accurate UVLO programming using external resistive divider per Equation 2–3 in datasheet Section 5. |
| Cycle-by-cycle OCP | 4.25A–5.75A peak current limit with hiccup recovery - protects against short-circuit faults while limiting thermal stress during sustained overload. |
Applications
| 5V/12V Distributed Power Bus | Power Tools & Laser Printers |
|---|---|
|
Use Scenario: Central 24V rail powering multiple isolated 5V/3.3V subsystems in factory automation controllers. IC Role / Device Role / Timing Role: Primary step-down regulator delivering stable 5V @ 3.5A with <10mV line/load regulation per Figures 6–7. Use Value: SO-8EP thermal design (θJA = 45°C/W) enables operation at 85°C ambient without derating; FSS ensures EN55032 Class B compliance. |
Use Scenario: Battery-powered cordless drill with 18V nominal Li-ion pack supplying motor driver and MCU rails. IC Role / Device Role / Timing Role: High-efficiency buck converter operating from 12V–40V input swing during battery discharge and regenerative braking. Use Value: 22µA IQ in PFM extends standby runtime; programmable soft-start prevents inrush into large motor-control capacitors. |
| Home Audio Amplifiers | Network Systems (Routers/Switches) |
|
Use Scenario: Dual-rail 12V/–12V audio amplifier stage requiring low-noise, low-EMI local regulation from 24V supply. IC Role / Device Role / Timing Role: Single-ended buck generating clean 12V rail; EMI-optimized layout minimizes coupling into analog signal paths. Use Value: Ringing-free gate driver and FSS reduce radiated emissions below 30MHz - critical for FCC Part 15 Class B certification. |
Use Scenario: PoE-powered Ethernet switch with auxiliary 5V rail for PHY and management controller. IC Role / Device Role / Timing Role: Secondary regulator accepting variable input (12V–40V) from midspan or endpoint PoE sourcing. Use Value: Wide VIN range eliminates need for intermediate pre-regulator; thermal shutdown (+160°C) and OVP protect against PoE fault conditions. |
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 max output, 2.5V–36V input, no FSS, higher IQ (45µA), SO-8 package without exposed pad. | Lacks EMI features and thermal performance; suitable only for non-critical, lower-power applications. | Choose only if board space constraints prohibit SO-8EP footprint and EMI testing is not required. |
| TPS54331DR (Texas Instruments) | 3A, 3.5V–28V input, no integrated low-side MOSFET (external diode), no FSS, 26µA IQ, SOIC-8. | Requires external freewheeling diode; limited input range excludes 40V industrial buses; no programmable UVLO. | Select when cost sensitivity outweighs integration benefits and 28V max VIN suffices. |
Compared with MP2451DT-LF-Z and TPS54331DR, AP64351SP-13 uniquely combines 40V input capability, integrated dual MOSFETs, FSS, and SO-8EP thermal performance - making it the only option qualified for 24V/40V industrial bus designs requiring EMI compliance and high ambient operation.
Availability
AP64351SP-13 is available at Aetrix Electronics and suitable for 5V/12V/24V distributed power bus supplies, power tools and laser printers, and network systems requiring stable component supply across automotive-grade temperature ranges (–40°C to +85°C).
Supply support for AP64351SP-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 manufacturer specializing in discrete, analog, and mixed-signal ICs, with emphasis on power management, signal integrity, and protection devices.
The AP64351SP-13 belongs to Diodes' high-voltage synchronous buck converter product line, engineered for robust EMI performance and wide-input industrial power conversion - targeting applications where reliability under voltage transients and thermal stress is critical.
FAQ
What is the minimum recommended input voltage for reliable startup?
The AP64351SP-13 has a guaranteed undervoltage lockout (UVLO) rising threshold of 3.5V, with hysteresis of 400mV. Reliable startup occurs when VIN exceeds 3.7V, as confirmed in Absolute Maximum Ratings and Recommended Operating Conditions tables. Below 3.5V, the device remains disabled to prevent unstable regulation.
Can the soft-start time be adjusted, and how is it calculated?
Yes, soft-start time is set by an external capacitor (Css) from SS to GND. With a 4µA internal current source charging Css, tSS ≈ Css × 0.25V/4µA = Css × 62.5 ms/µF. For example, 10nF yields ~0.625ms; the datasheet specifies 2ms typical with 10nF due to internal tolerances and layout parasitics.
Does AP64351SP-13 support forced PWM mode at light loads?
No - the AP64351SP-13 automatically transitions from forced PWM at heavy loads to Pulse-Frequency Modulation (PFM) at light loads (below ~750mA). This mode switch is inherent to its control architecture and cannot be disabled; PFM enables 22µA IQ and 85% efficiency at 5mA, as measured in Figure 4.
How is thermal performance validated for SO-8EP mounting?
Thermal resistance is characterized per JEDEC JESD51-7 on a four-layer FR-4 PCB with 2oz copper and minimum recommended pad layout. θJA = 45°C/W and θJC = 5°C/W are measured values - not simulated - and appear in the Thermal Resistance table (page 4 of DS41977 Rev. 5-2). Exposed pad must be soldered to GND plane for these values to hold.
AP64351SP-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:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO-EP
AP64351SP-13 FAQ
1.How can I place an order for AP64351SP-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP64351SP-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 AP64351SP-13 reliable?
The price and inventory of AP64351SP-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP64351SP-13 is usually 5 days.
3.What payment methods are accepted for AP64351SP-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP64351SP-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP64351SP-13?
AP64351SP-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP64351SP-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 AP64351SP-13?
For technical support, including AP64351SP-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP64351SP-13 requirements.
6.How does Aetrix verify that AP64351SP-13 is sourced from the original manufacturer or authorized distributors?
All AP64351SP-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 AP64351SP-13 meets industry standards.
7.What is the process for return or replacement of AP64351SP-13?
All AP64351SP-13 units undergo pre-shipment inspection (PSI). If there is an issue with AP64351SP-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 AP64351SP-13 part is unused and in its original packaging.
Return procedure for AP64351SP-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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