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Diodes Incorporated AP3581BMPTR-G1
- Part No.:
- AP3581BMPTR-G1
- Manufacturer:
- Diodes Incorporated
- Category:
- DC DC Switching Controllers
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
AP3581BMPTR-G1.pdf
- Description:
- IC REG CTRLR BUCK 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,094
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Product details
Overview
AP3581BMPTR-G1 from Diodes Incorporated is a single-phase synchronous buck PWM controller in PSOP-8 package, designed for 5V/12V input supplies delivering regulated output down to 0.8V with ±12mV reference accuracy. It operates at fixed 300kHz switching frequency, integrates dual MOSFET drivers with built-in bootstrap diode, and features voltage-mode control with 10MHz error amplifier bandwidth and 6V/μs slew rate for fast transient response in microprocessor core supplies.
For engineers reviewing the AP3581BMPTR-G1 datasheet, AP3581BMPTR-G1 pinout, AP3581BMPTR-G1 application, or AP3581BMPTR-G1 equivalent, key selection criteria include its 0.8V internal reference, lossless RDS(ON)-based overcurrent protection, adaptive shoot-through prevention, start-up into pre-biased output capability, and thermal shutdown at +160°C.
Technical Context
The AP3581BMPTR-G1 implements voltage-mode PWM control with a single feedback loop referenced to an internal 0.8V precision bandgap. Its error amplifier delivers 10MHz gain-bandwidth and 6V/μs slew rate, enabling high-loop bandwidth for sub-10μs load transient recovery in DDR memory and DSP core rails.
It integrates bootstrapped high-side gate drive (UGATE) and low-side gate drive (LGATE) with adaptive shoot-through protection monitored across PHASE, UGATE, and LGATE pins. The OPS pin enables programmable overcurrent threshold using external resistor, while COMP/EN provides both compensation network interface and logic-level enable/disable control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Reference | 0.8V ±12mV - sets minimum regulation point for DDR/SDRAM termination and low-voltage processor cores |
| Switching Frequency | 300kHz ±10% - balances efficiency vs. size for 1–2A mid-power DC-DC stages |
| Error Amplifier GBW | 10MHz - supports >200kHz closed-loop bandwidth for <10μs 1A→5A step response |
| Max Duty Cycle | 80% - enables ≥9.6V output from 12V input, suitable for intermediate bus conversion |
| Overcurrent Threshold | Programmable via OPS resistor - uses lower MOSFET RDS(ON) for lossless sensing without current-sense resistor |
| Soft-start Interval | 2.7ms - controls inrush current during power-up into pre-biased loads |
| Thermal Shutdown | +160°C with +20°C hysteresis - protects against sustained overload or poor PCB thermal design |
Pinout & Package
AP3581BMPTR-G1 is housed in a thermally enhanced PSOP-8 package with exposed ground pad (Pin 9), supporting up to 50°C/W junction-to-ambient thermal resistance. The 8-pin layout includes dedicated high-side and low-side gate drivers, integrated bootstrap circuitry, and dual-function COMP/EN pin for loop compensation and shutdown control.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 BOOT | Bootstrap capacitor node | Connects 0.1–0.47μF capacitor to PHASE to generate >12V gate drive for N-channel high-side MOSFET |
| 2 UGATE | High-side MOSFET gate driver output | Drives upper switch with 1.5A sink / 1A source capability; monitored for shoot-through prevention |
| 3 OPS | Overcurrent setpoint input | Resistor to GND programs current limit using lower MOSFET RDS(ON) - eliminates sense resistor |
| 4 LGATE | Low-side MOSFET gate driver output | Drives synchronous rectifier with 1.5A sink / 1A source; monitored with UGATE and PHASE for timing safety |
| 5 VCC | Bias supply input | Accepts 4.5–13.2V input; powers internal regulators and gate drivers; requires local bypass capacitor |
| 6 FB | Inverting error amplifier input | Compares output voltage (via resistor divider) against 0.8V reference to regulate output |
| 7 COMP/EN | Compensation network output & enable input | Connects RC network for loop stability; pulled low to disable PWM and enter shutdown mode |
| 8 PHASE | Switch node connection | Connects to source of high-side MOSFET and drain of low-side MOSFET; monitored for timing and protection |
| 9 GND | Power and signal ground | Exposed thermal pad - must be soldered to large ground plane for thermal and EMI performance |
Key Features
| Feature | Design Value |
|---|---|
| Integrated bootstrap diode | Eliminates external diode, reducing BOM count and layout area in compact 5V/12V-input buck designs |
| Voltage-mode PWM control | Single-loop architecture simplifies compensation design versus current-mode; enables stable operation with ceramic output capacitors |
| Start-up into pre-biased output | Allows safe power sequencing in multi-rail systems where output voltage is non-zero before controller activation |
| Adaptive shoot-through protection | Hardware-monitored timing between UGATE, LGATE, and PHASE prevents cross-conduction without software or external logic |
| Built-in thermal shutdown | Auto-recovery hysteresis (+160°C trip, +140°C resume) avoids latch-up during temporary overload conditions |
Applications
| DDR/SDRAM Bus Termination | DSP Core Power Supply |
|---|---|
|
Use Scenario: Supplies SSTL-2 or DDR3/4 termination voltage (VTT) requiring tight regulation and fast load steps. IC Role / Device Role / Timing Role: Primary synchronous buck controller regulating 0.9V/1.2V VTT rail with 0.8V reference and 300kHz switching. Use Value: 10MHz error amplifier enables <15μs recovery from 0A→3A load transients, meeting JEDEC VTT settling requirements. |
Use Scenario: Powers digital signal processor core (e.g., TI C6000, Analog Devices SHARC) with dynamic voltage scaling. IC Role / Device Role / Timing Role: Adjustable-output buck controller delivering 0.8–1.2V at up to 5A with programmable OCP. Use Value: Lossless RDS(ON) current sensing eliminates power loss and board space used by shunt resistors. |
| PCI/AGP Graphics Card VRM | Industrial 5V Input DC-DC Regulator |
|
Use Scenario: Generates GPU core voltage (e.g., 1.0V/1.1V) on legacy PCI/AGP graphics cards with constrained board area. IC Role / Device Role / Timing Role: Compact PSOP-8 synchronous buck controller replacing discrete driver + PWM IC solutions. Use Value: Integrated 12V+12V bootstrapped gate drive supports standard logic-level MOSFETs without external level shifters. |
Use Scenario: Provides isolated 3.3V/5V rail from unregulated 5V industrial bus with wide input tolerance. IC Role / Device Role / Timing Role: Fixed-frequency buck controller operating from 3.0–13.2V input with under-voltage lockout. Use Value: 4.2V POR threshold and 500mV hysteresis ensure clean startup across noisy 5V supply domains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP3582BMPTR-G1 | Same PSOP-8 package, identical pinout, but adds adjustable soft-start and improved light-load efficiency | Preferred for new designs requiring programmable startup timing and higher efficiency below 10% load | Select AP3582BMPTR-G1 if soft-start duration tuning or >85% efficiency at 100mA is required |
| ISL6208IRZ-T | 8-pin SOIC, 300kHz fixed frequency, no integrated bootstrap diode, requires external diode and separate VDD regulator | Suitable where board layout allows extra components and thermal constraints permit SOIC package | Choose ISL6208IRZ-T only when legacy compatibility with Intersil footprint or specific thermal derating rules apply |
Compared with AP3582BMPTR-G1 and ISL6208IRZ-T, the AP3581BMPTR-G1 offers lowest BOM count due to integrated bootstrap diode and simplest compensation network, but lacks soft-start adjustability and has higher light-load quiescent current.
Availability
AP3581BMPTR-G1 is available at Aetrix Electronics and suitable for DDR termination supplies, DSP core rails, PCI graphics card VRMs, and industrial 5V-input DC-DC regulators requiring stable component supply and long-term obsolescence management.
Supply support for AP3581BMPTR-G1 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 power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.
The AP3581 series belongs to Diodes' high-integration synchronous buck controller product line, engineered for cost-sensitive, space-constrained 5V/12V-input point-of-load applications in computing and communications infrastructure.
FAQ
What is the function of the COMP/EN pin on AP3581BMPTR-G1?
The COMP/EN pin serves two distinct functions: it outputs the error amplifier signal for external compensation network connection (RC network between COMP and FB), and acts as a logic-level enable/disable input - pulling it below 0.3V shuts down PWM operation and places gate drivers in high-impedance state. This dual role reduces pin count while maintaining full loop control and system-level power sequencing capability.
Can AP3581BMPTR-G1 operate with a 5V-only input supply?
Yes. AP3581BMPTR-G1 supports input voltages from 4.5V to 13.2V on the VCC pin, making it fully compatible with 5V-only bias supplies. When powered from 5V, the internal regulators maintain stable 3.3V logic and 0.8V reference; however, the bootstrap circuit requires sufficient headroom - for 5V input, use a 0.47μF BOOT capacitor and ensure PHASE swing remains within absolute maximum ratings.
How does the OPS pin implement lossless overcurrent protection?
The OPS pin connects to an external resistor tied to GND, setting a current threshold based on internal 40μA current source. During normal operation, the controller monitors voltage drop across the lower MOSFET's RDS(ON) during conduction. When this drop exceeds the threshold defined by the OPS resistor, the controller terminates the switching cycle - eliminating need for a separate current-sense resistor and associated power loss.
Is AP3581BMPTR-G1 RoHS compliant and lead-free?
Yes. The "G1" suffix in AP3581BMPTR-G1 explicitly denotes RoHS-compliant and green (halogen-free) packaging per Diodes Incorporated's ordering nomenclature. The PSOP-8 package uses matte tin lead finish, meets JEDEC J-STD-020 moisture sensitivity level 3, and is rated for reflow peak temperature of +260°C.
AP3581BMPTR-G1 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
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 4.5V ~ 13.2V
- Frequency - Switching:
- 300kHz
- Duty Cycle (Max):
- 80%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable, Phase Control
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO-EP
AP3581BMPTR-G1 FAQ
1.How can I place an order for AP3581BMPTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP3581BMPTR-G1 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 AP3581BMPTR-G1 reliable?
The price and inventory of AP3581BMPTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP3581BMPTR-G1 is usually 5 days.
3.What payment methods are accepted for AP3581BMPTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP3581BMPTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP3581BMPTR-G1?
AP3581BMPTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP3581BMPTR-G1 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 AP3581BMPTR-G1?
For technical support, including AP3581BMPTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP3581BMPTR-G1 requirements.
6.How does Aetrix verify that AP3581BMPTR-G1 is sourced from the original manufacturer or authorized distributors?
All AP3581BMPTR-G1 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 AP3581BMPTR-G1 meets industry standards.
7.What is the process for return or replacement of AP3581BMPTR-G1?
All AP3581BMPTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AP3581BMPTR-G1, 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 AP3581BMPTR-G1 part is unused and in its original packaging.
Return procedure for AP3581BMPTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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