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Diodes Incorporated AP64352SP-13
- Part No.:
- AP64352SP-13
- Manufacturer:
- Diodes Incorporated
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
AP64352SP-13.pdf
- Description:
- IC REG BUCK ADJ 3.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,735
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Product details
Overview
AP64352SP-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, 0.8V ±1% reference, 22µA quiescent current in PFM mode, and SO-8EP package - used for stable 5V/12V/24V point-of-load regulation in industrial power tools and network systems.
For engineers reviewing the AP64352SP-13 datasheet, AP64352SP-13 pinout, AP64352SP-13 application, or AP64352SP-13 equivalent, key selection criteria include EMI-reduced switching (FSS ±6% jitter + proprietary gate driver), programmable 100kHz–2.2MHz frequency, precision EN threshold (1.18V), cycle-by-cycle OCP, and thermal shutdown at +160°C.
Technical Context
The AP64352SP-13 employs fixed-frequency peak current mode control with internal slope compensation to prevent subharmonic oscillation above 50% duty cycle. Its integrated loop compensation eliminates external Type-II/III networks, reducing BOM count while maintaining stability across 0.8V–39V output range.
EMI mitigation combines two hardware-level techniques: a multi-level gate driver that suppresses SW node ringing without degrading edge rates, and Frequency Spread Spectrum (FSS) with ±6% switching frequency jitter to disperse conducted/radiated noise energy across a broader spectrum.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 3.8V to 40V DC - supports direct connection to 5V, 12V, 24V, and 36V industrial bus rails without pre-regulation. |
| IOUT Max | 3.5A continuous - delivers full rated current at 85°C ambient with SO-8EP package and proper PCB copper area. |
| VFB Accuracy | 0.8V ±1% (792–808mV) - enables precise output voltage setting via resistive divider with <±1.5% total error at 25°C. |
| fSW Range | 100kHz to 2.2MHz - selectable via RT resistor or external clock; 500kHz typical with 200kΩ sets optimal efficiency/size trade-off. |
| IQ (PFM) | 22µA typical - sustains >85% efficiency at 5mA load, critical for always-on IoT and battery-backed systems. |
| RDS(ON) HS/LG | 75mΩ / 45mΩ - low conduction loss enables high efficiency (>90% at 1A, 12V→5V) and reduced thermal stress. |
| OVP Threshold | +10% over target - fast high-side turn-off prevents damage during load dump or transient overshoot events. |
| TSD | +160°C with +25°C hysteresis - latches off until junction cools, protecting against sustained overload or poor heatsinking. |
Pinout & Package
AP64352SP-13 is housed in an SO-8EP (exposed pad) thermally enhanced package. The exposed pad (Pin 9) must be soldered to a PCB ground plane for thermal performance (θJA = 45°C/W) and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST (1) | High-side gate drive boost supply | Requires 100nF ceramic capacitor to SW; enables full enhancement of 75mΩ high-side MOSFET across input range. |
| VIN (2) | Main power input | Accepts 3.8V–40V; must be bypassed with ≥10µF low-ESR capacitor near pin to suppress switching noise and sustain current delivery. |
| EN (3) | Enable control with UVLO programming | Logic-high threshold = 1.18V; internal 1.5µA pull-up allows floating startup; external resistor divider adjusts VIN UVLO points. |
| RT/CLK (4) | Frequency programming & sync input | Connect 200kΩ to GND for 500kHz; accepts 100kHz–2.2MHz external clock for system-level timing alignment. |
| FB (5) | Output voltage feedback sensing | Compares divided output to 0.8V reference; sets VOUT = 0.8V × (1 + R1/R2); tolerates ±6V max input. |
| SS (6) | Soft-start timing control | Internal 4µA current charges external capacitor; 10nF yields ~2ms ramp time, limiting inrush into downstream capacitance. |
| GND (7) | Power and signal ground reference | Common return for control logic, feedback, and power stage; must connect directly to exposed pad for thermal and noise integrity. |
| SW (8) | Switching node output | Drives external LC filter; high dv/dt node requiring tight layout; connects to BST capacitor and inductor. |
| EXPOSED PAD (9) | Thermal and electrical ground path | Electrically tied to GND; mandatory solder connection to inner/outer ground planes for θJC = 5°C/W and EMI suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated MOSFETs | 75mΩ HS + 45mΩ LS enable single-chip 3.5A buck conversion - eliminates external FETs, drivers, and bootstrap diodes. |
| FSS EMI Reduction | ±6% frequency jitter spreads spectral energy, lowering peak radiated emissions by up to 10dB compared to fixed-frequency operation. |
| Ringing-Free Gate Driver | Proprietary multi-level drive damps SW node oscillation without slowing edges - preserves efficiency while meeting CISPR 32 Class B limits. |
| Low-IQ PFM Mode | 22µA quiescent current enables >85% efficiency at 5mA load - extends runtime in standby or sensor-monitoring states. |
| Programmable UVLO | EN pin's 4µA hysteresis current source allows custom rising/falling VIN thresholds (e.g., 24V ON / 22V OFF) using two external resistors. |
| Robust Protection Suite | Includes cycle-by-cycle OCP (5.75A peak), OVP (+10%), thermal shutdown (+160°C), and UVLO - reduces need for external supervision ICs. |
Applications
| Industrial Power Tools | Network Infrastructure |
|---|---|
|
Use Scenario: Regulating 24V battery input to stable 5V/3.3V for motor controllers, MCU, and communication ICs in cordless drills and saws. IC Role / Device Role / Timing Role: Primary synchronous buck regulator handling wide VIN transients (load dump, regen braking) and high pulse currents. Use Value: 40V absolute max rating and 3.5A continuous output withstand motor stall surges; low IQ extends battery life between charges. |
Use Scenario: Point-of-load conversion in Ethernet switches and PoE injectors where 12V or 48V intermediate bus supplies 3.3V/1.8V to PHYs and FPGAs. IC Role / Device Role / Timing Role: EMI-optimized DC-DC stage meeting CISPR 32 radiated emission limits in dense board layouts with multiple converters. Use Value: FSS + ringing-free SW node enables pass-fail compliance without shielding cans or ferrite beads - reducing bill-of-material cost. |
| Home Audio Systems | White Goods Control Boards |
|
Use Scenario: Generating clean 5V rail for DACs, amplifiers, and touch interfaces in smart speakers and AV receivers powered from 12V wall adapters. IC Role / Device Role / Timing Role: Low-noise, high-PSRR buck converter minimizing switching artifacts in analog audio signal paths. Use Value: 0.8V reference accuracy and tight FB tolerance ensure consistent output under line/load variation - preserving audio fidelity. |
Use Scenario: Powering microcontrollers, displays, and sensors on washing machine or refrigerator main control boards fed from 24V HVAC bus. IC Role / Device Role / Timing Role: Reliable, long-lifetime power solution operating continuously at 60–85°C ambient with thermal hysteresis protection. Use Value: +160°C thermal shutdown with +25°C hysteresis prevents latch-up during ventilation failure or heat soak 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 | 3A rating, 4.5V–36V input, no FSS, higher IQ (45µA), requires external compensation. | Lacks EMI features and light-load efficiency; suitable only where cost is primary and EMI testing is waived. | Choose only if input range ≤36V and system-level EMI filtering is already implemented. |
| LM61480RQR | 4A rating, 3.5V–36V input, integrated FSS, but larger QFN-16 package and no programmable UVLO. | Higher current capability but less flexible input sequencing; requires more PCB area and lacks EN-based UVLO tuning. | Select when >3.5A is needed and board space permits larger footprint; avoid if UVLO customization is required. |
Compared with MP2451DT-LF-Z and LM61480RQR, AP64352SP-13 uniquely balances wide 40V input, EMI-hardened design, UVLO programmability, and SO-8EP compactness - making it optimal for cost-sensitive, space-constrained industrial applications needing robust EMC compliance.
Availability
AP64352SP-13 is available at Aetrix Electronics and suitable for industrial power tools, network infrastructure equipment, and white goods control boards requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for AP64352SP-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 solutions for industrial, computing, consumer, and automotive markets.
The AP64352SP-13 belongs to Diodes' high-voltage synchronous buck converter product line, engineered for EMI-critical, wide-input industrial power supplies where reliability, small size, and design simplicity are prioritized.
FAQ
What is the minimum recommended input voltage for reliable startup?
The AP64352SP-13 has a guaranteed undervoltage lockout (UVLO) rising threshold of 3.5V and hysteresis of 400mV. Startup is reliable down to 3.7V input, but operation below 3.8V violates recommended conditions and may cause intermittent regulation or premature shutdown.
Can the AP64352SP-13 operate without an external soft-start capacitor?
No - the SS pin requires an external ceramic capacitor (e.g., 10nF) to control ramp rate. Without it, the internal 4µA current source pulls SS to VCC uncontrolled, causing unregulated output voltage rise and potential inrush damage to downstream capacitors or ICs.
How does the Frequency Spread Spectrum (FSS) function interact with external clock synchronization?
FSS is disabled when an external clock is applied to RT/CLK. The device synchronizes precisely to the incoming clock signal (100kHz–2.2MHz) and operates at fixed frequency. FSS only activates in resistor-timed mode to reduce EMI during standalone operation.
Is the exposed thermal pad electrically isolated or must it be grounded?
The exposed pad is internally connected to GND and must be soldered to a PCB ground plane. Leaving it floating causes thermal runaway, degraded EMI performance, and potential functional failure - per Diodes' layout guidelines, it is not optional or isolatable.
AP64352SP-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
AP64352SP-13 FAQ
1.How can I place an order for AP64352SP-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP64352SP-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 AP64352SP-13 reliable?
The price and inventory of AP64352SP-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP64352SP-13 is usually 5 days.
3.What payment methods are accepted for AP64352SP-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP64352SP-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP64352SP-13?
AP64352SP-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP64352SP-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 AP64352SP-13?
For technical support, including AP64352SP-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP64352SP-13 requirements.
6.How does Aetrix verify that AP64352SP-13 is sourced from the original manufacturer or authorized distributors?
All AP64352SP-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 AP64352SP-13 meets industry standards.
7.What is the process for return or replacement of AP64352SP-13?
All AP64352SP-13 units undergo pre-shipment inspection (PSI). If there is an issue with AP64352SP-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 AP64352SP-13 part is unused and in its original packaging.
Return procedure for AP64352SP-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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