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Diodes Incorporated AP65400SP-13
- Part No.:
- AP65400SP-13
- Manufacturer:
- Diodes Incorporated
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
AP65400SP-13.pdf
- Description:
- IC REG BUCK ADJ 4A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,798
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Product details
Overview
AP65400SP-13 from Diodes Incorporated is a 340kHz external-compensated synchronous buck DC/DC converter with integrated high- and low-side MOSFETs (RDS(ON) = 80 mΩ / 32 mΩ), delivering up to 4A continuous output current at up to 96% efficiency, adjustable output voltage from 0.8V to 16V, and automated light-load efficiency improvement - used in FPGA/DSP power supplies for stable core voltage regulation.
For engineers reviewing the AP65400SP-13 datasheet, AP65400SP-13 pinout, AP65400SP-13 application, or AP65400SP-13 equivalent, key selection considerations include its 4.75–18V input range, 0.8V feedback reference, thermal shutdown at 160°C, hiccup-mode OCP, and SO-8EP package with exposed pad for thermal management.
Technical Context
The AP65400SP-13 implements current-mode control with internal transconductance error amplifier (GEA = 1000 µA/V) and slope compensation to suppress subharmonic oscillation at half-switching frequency. Its COMP pin enables external RC network tuning of loop stability and transient response.
It features automatic mode transition between light-load high-efficiency pulse-frequency modulation (PFM) and continuous PWM operation, triggered by sensed output current crossing a critical threshold. Protection includes cycle-by-cycle overcurrent (7A peak HS limit), UVLO (4.05V rising threshold), and thermal shutdown with 40°C hysteresis (160°C trip, 120°C recovery).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4.75V to 18V - supports 5V, 12V, and 15V intermediate bus architectures without pre-regulation. |
| IOUT Continuous | 4A - delivers full-rated current at 85°C ambient with SO-8EP thermal resistance θJA = 39.2°C/W. |
| Switching Frequency | 340kHz (±12%) - balances EMI, inductor size, and efficiency; fold-back to 102kHz during overcurrent. |
| VFB Reference | 0.800V ±1% - sets output voltage via resistive divider; enables precise 1.2V–16V adjustment with <1% accuracy. |
| RDS(ON) HS / LS | 80 mΩ / 32 mΩ - reduces conduction loss; enables >94% efficiency at 3.3V/3A with 12V input. |
| Soft-Start Time | 13ms with 0.1µF SS-to-GND capacitor - limits inrush current and prevents output overshoot during startup. |
| Thermal Shutdown | 160°C with 40°C hysteresis - protects die during sustained overload or poor PCB heatsinking. |
Pinout & Package
AP65400SP-13 is housed in a RoHS-compliant Green SO-8EP (Small Outline-8 Exposed Pad) package with 1.27mm pitch, 4.9mm × 6.0mm body, and thermally enhanced EP connected to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BS (Pin 1) | Bootstrap Supply Input | Provides gate drive voltage for high-side N-MOSFET; requires ≥0.01µF capacitor from BS to SW. |
| IN (Pin 2) | Main Power Input | Accepts 4.75–18V supply; must be bypassed with low-ESR capacitor near IC for noise suppression. |
| SW (Pin 3) | Switch Node | Connects to inductor and bootstrap capacitor; carries high di/dt switching waveform; layout critical for EMI. |
| GND (Pin 4) | Power & Signal Ground | Common return for power paths and analog circuitry; tied to exposed pad for thermal conduction. |
| FB (Pin 5) | Feedback Input | Senses output voltage via resistor divider; regulates VOUT to 0.800V reference; high-impedance node. |
| COMP (Pin 6) | Compensation Node | Output of internal error amplifier; connects to external RC network to set loop bandwidth and phase margin. |
| EN (Pin 7) | Enable Control | Digital input with 0.8V rising threshold and 2.5V lockout; 100kΩ pull-up to IN enables auto-start. |
| SS (Pin 8) | Soft-Start Timing | Sinks 6µA current; capacitor value directly sets ramp time for VREF from 0V to 0.8V. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated High/Low-Side MOSFETs | Eliminates external switch selection and layout complexity; reduces BOM count and board area by >30% vs discrete solutions. |
| Automated Light-Load Efficiency Mode | Switches to PFM at <300mA load, reducing quiescent current to 0.3µA and enabling <10mW no-load power dissipation. |
| External Compensation (COMP Pin) | Enables precise loop tuning for diverse output capacitors and loads; supports ceramic, polymer, or hybrid output caps. |
| Hiccup-Mode Overcurrent Protection | Limits fault energy during short-circuit: shuts down, cools, then retries - prevents thermal runaway and MOSFET destruction. |
| Green SO-8EP Package | Halogen- and antimony-free (<900ppm Br/Cl, <1000ppm Sb); meets RoHS 2 (2011/65/EU) and JEDEC MSL3 standards. |
Applications
| Gaming Console Core Power | FPGA I/O Bank Supply |
|---|---|
Use Scenario: Powers GPU and CPU cores in compact gaming consoles requiring tight voltage tolerance and fast load transient response. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering 1.2V @ 4A with <±1% regulation under 2A–4A dynamic load steps. Use Value: Integrated MOSFETs and 340kHz switching enable small 3.3µH inductor and minimal output capacitance, saving >25% board space vs legacy controllers. | Use Scenario: Supplies configurable I/O banks on Xilinx/Intel FPGAs where voltage levels vary per interface standard (LVDS, SSTL, HSTL). IC Role / Device Role / Timing Role: Adjustable-output buck converter set to 1.8V, 2.5V, or 3.3V using external resistor divider; regulated via 0.8V FB reference. Use Value: 0.8V feedback accuracy and external soft-start prevent configuration errors during FPGA configuration and reduce bitstream corruption risk. |
| Flat Panel TV Backlight Driver Bias | Network System PoE PD Converter |
Use Scenario: Generates bias voltage for LED driver ICs in LCD/LED TV backlights, operating from 12V intermediate rail. IC Role / Device Role / Timing Role: Secondary buck stage stepping 12V down to 5V/3.3V for logic and gate drivers; handles 100ms load transients during dimming transitions. Use Value: Current-mode control and 340kHz frequency ensure <50µs response to 2A load steps, preventing backlight flicker during scene changes. | Use Scenario: Converts IEEE 802.3af/at PoE input (37–57V) to 12V/5V for switch/router line cards after primary flyback stage. IC Role / Device Role / Timing Role: Post-regulator maintaining tight output tolerance despite upstream flyback ripple and variable load (1–4A). Use Value: UVLO (4.05V) and thermal shutdown (160°C) ensure safe operation during PoE cable faults or airflow blockage in enclosed chassis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2315DJ-LF-Z (Monolithic Power) | Higher 500kHz fSW, lower 3A rating, integrated boot diode, no external COMP pin. | Requires smaller inductor but less flexible loop tuning; unsuitable for ultra-low-noise or wide-capacitance designs. | Select when board space is constrained and fixed 3A load suffices; avoid if output capacitor ESR varies widely across production lots. |
| TPS54332DR (Texas Instruments) | 4.5–28V input, 3.5A, 1MHz fSW, internal compensation, no light-load PFM mode. | Higher switching frequency increases EMI filtering burden; lacks automatic efficiency optimization below 500mA. | Prefer for high-input-voltage systems (>18V) where thermal headroom exists; not recommended for battery-backed or always-on consumer devices. |
Compared with MP2315DJ-LF-Z and TPS54332DR, the AP65400SP-13 offers superior light-load efficiency via PFM, external loop control for robustness across capacitor aging, and SO-8EP thermal performance ideal for convection-cooled consumer enclosures.
Availability
AP65400SP-13 is available at Aetrix Electronics and suitable for gaming console power delivery, FPGA I/O supply, and flat-panel TV bias generation requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for AP65400SP-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-efficiency power management, signal integrity, and protection solutions for consumer, industrial, and computing markets.
The AP65400 belongs to Diodes' high-current synchronous buck regulator product line, designed specifically for space-constrained, thermally demanding applications requiring 4A output with minimal external components and automated efficiency optimization.
FAQ
What is the minimum output voltage achievable with AP65400SP-13?
The AP65400SP-13 achieves a minimum regulated output voltage of 0.800V, set by its internal feedback reference voltage. This value is guaranteed across –40°C to +85°C ambient temperature and is independent of input voltage or load current within specification. Output voltages below 0.8V cannot be achieved without external circuitry modifying the FB node, which voids regulation guarantees.
Can AP65400SP-13 operate without an external soft-start capacitor?
Yes - leaving the SS pin floating disables the soft-start function, causing immediate startup with full reference voltage. However, this risks inrush current exceeding 7A peak and output overshoot >5%, especially with large output capacitance. Diodes recommends using at least 0.01µF on SS for reliable turn-on behavior in all production designs.
How does the AP65400SP-13 handle short-circuit conditions?
Under short-circuit, the AP65400SP-13 activates hiccup-mode overcurrent protection: it latches off after detecting >7A peak high-side current, waits ~200ms for thermal recovery, then attempts restart. This cycle repeats until fault clears. During hiccup, COMP and SS pins are actively discharged to GND, ensuring complete gate drive disable and zero output voltage.
Is the SO-8EP exposed pad required to be soldered to PCB ground?
Yes - the exposed pad (EP) must be soldered to a dedicated GND copper pour with ≥4 thermal vias (0.3mm diameter) to an inner-layer ground plane. Leaving it unconnected degrades θJA from 39.2°C/W to >70°C/W, risking thermal shutdown at <2A load. Diodes' layout guidelines specify minimum 25mm² pad area and solder mask defined for optimal thermal transfer.
AP65400SP-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:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.75V
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 16V
- Current - Output:
- 4A
- Frequency - Switching:
- 340kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO-EP
AP65400SP-13 FAQ
1.How can I place an order for AP65400SP-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP65400SP-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 AP65400SP-13 reliable?
The price and inventory of AP65400SP-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP65400SP-13 is usually 5 days.
3.What payment methods are accepted for AP65400SP-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP65400SP-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP65400SP-13?
AP65400SP-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP65400SP-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 AP65400SP-13?
For technical support, including AP65400SP-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP65400SP-13 requirements.
6.How does Aetrix verify that AP65400SP-13 is sourced from the original manufacturer or authorized distributors?
All AP65400SP-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 AP65400SP-13 meets industry standards.
7.What is the process for return or replacement of AP65400SP-13?
All AP65400SP-13 units undergo pre-shipment inspection (PSI). If there is an issue with AP65400SP-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 AP65400SP-13 part is unused and in its original packaging.
Return procedure for AP65400SP-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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