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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > DC DC Switching Controllers

Diodes Incorporated AP3581BMP-G1

Name: AP3581BMP-G1
Brand: Diodes Incorporated
SKU: AP3581BMP-G1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP3581BMP-G1

Manufacturer:: Diodes Incorporated

Category:: DC DC Switching Controllers

Package:: 8-SOIC (0.154", 3.90mm Width) Exposed Pad

Datasheet:: AP3581BMP-G1.pdf

Description:: IC REG CTRLR BUCK 8PSOP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AP3581BMP-G1 from BCD Semiconductor is a single-phase synchronous buck PWM controller designed for 5V/12V input DC-DC conversion, delivering regulated output down to 0.8V with ±1% reference accuracy, fixed 300kHz switching frequency, and integrated 12V bootstrap drivers supporting N-channel MOSFETs. It targets microprocessor core supplies and DDR memory termination in embedded and PC power systems.

For engineers reviewing the AP3581BMP-G1 datasheet, AP3581BMP-G1 pinout, AP3581BMP-G1 application, or AP3581BMP-G1 equivalent, key selection criteria include its voltage-mode control architecture, 10MHz error amplifier bandwidth, lossless over-current protection using lower MOSFET R_DS(ON), and PSOP-8 thermal performance with exposed pad grounding.

Technical Context

The AP3581BMP-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 to support high converter bandwidth and fast transient response under load steps up to 20A.

Adaptive shoot-through protection monitors UGATE, LGATE, and PHASE pins to prevent cross-conduction. The built-in bootstrap diode eliminates external components, while the OPS pin enables programmable over-current threshold via external resistor-leveraging lower MOSFET R_DS(ON) for lossless sensing.

Key Specifications

Parameter	Value and Actual Design Meaning
Control Mode	Voltage-mode PWM with single feedback loop enabling stable regulation without current-sense resistor
Reference Voltage	0.8V ±1.5% (AP3581B), enabling precise 1.2V/1.5V/1.8V output setting for DDR/SSTL-2 bus termination
Switching Frequency	300kHz ±10%, optimized for low EMI and balanced efficiency in 5–12V input industrial and computing supplies
Error Amplifier GBW	10MHz, supporting >200kHz closed-loop bandwidth for sub-10µs load transient recovery
Max Duty Cycle	80%, allowing ≥9.6V output from 12V input-suitable for intermediate bus conversion
Over-Current Protection	Lossless, resistor-programmable via OPS pin using lower MOSFET R_DS(ON), eliminating sense-resistor power loss
Soft-Start Interval	2.7ms typical, preventing inrush current during power-up into pre-biased outputs

Pinout & Package

AP3581BMP-G1 is housed in a PSOP-8 package with exposed thermal pad (Pin 9 GND) for enhanced heat dissipation in high-current buck applications. The package supports surface-mount assembly and provides low θ_JA of 50°C/W.

Pin/Terminal	Circuit Role	Design Meaning
1 BOOT	Bootstrap capacitor node	Generates gate drive voltage ≥12V above PHASE to fully enhance upper N-MOSFET; requires 0.1–0.47µF ceramic capacitor
2 UGATE	Upper MOSFET gate driver output	Provides ±1A peak drive current with adaptive shoot-through protection; monitored for turn-off timing
3 OPS	Over-current threshold programming	Resistor-to-GND sets trip point based on lower MOSFET R_DS(ON); enables lossless current limiting
4 LGATE	Lower MOSFET gate driver output	Sinks 1.5A to rapidly discharge lower MOSFET gate; monitored for shoot-through prevention
5 VCC	Bias supply input	Accepts 4.5–13.2V input; powers internal circuitry and gate drivers; requires local bypass capacitor
6 FB	Inverting error amplifier input	Compares output voltage (via resistor divider) against 0.8V reference; sets regulated output level
7 COMP/EN	Error amp output & enable/disable	Output drives compensation network; pulled low to disable PWM and enter shutdown mode
8 PHASE	Switch node connection	Connects to source of upper MOSFET and drain of lower MOSFET; monitored for adaptive dead-time control
9 GND	Signal + power ground	Exposed thermal pad; must be tied to lowest-impedance ground plane for thermal and noise performance

Key Features

Feature	Design Value
Integrated bootstrap diode	Eliminates external diode, reducing BOM count and PCB area in compact 5V/12V input designs
Start-up into pre-biased output	Enables safe power sequencing in multi-rail systems where output voltage may be non-zero at enable
Thermal shutdown with hysteresis	Triggers at 160°C with 20°C hysteresis to prevent cycling during overload or poor heatsinking
Under-voltage protection	Disables operation when FB falls below 0.4V, preventing unstable regulation during brown-out conditions
Fast transient response	Supported by 10MHz error amplifier and adaptive gate drive timing, achieving <10µs recovery from 0→20A load step

Applications

DDR Memory Termination Supply

Microprocessor Core Supply

Use Scenario: Providing SSTL-2 compliant 1.25V termination voltage for DDR2/DDR3 memory buses in networking equipment.

IC Role / Device Role / Timing Role: Synchronous buck controller regulating low-noise, tightly-toleranced output with fast load-step response to track memory bus activity.

Use Value: 0.8V reference accuracy and 300kHz fixed frequency minimize output ripple and simplify EMI filtering for signal integrity-critical interfaces.

Use Scenario: Delivering 1.2V/1.5V core voltage to ARM-based embedded controllers in industrial HMIs with strict thermal constraints.

IC Role / Device Role / Timing Role: Primary voltage regulator implementing voltage-mode control with soft-start and thermal shutdown for reliable cold-boot and overload handling.

Use Value: Integrated boot diode and PSOP-8 exposed pad reduce thermal resistance to 50°C/W, enabling >5A continuous output without heatsink.

PCI/AGP Graphics Card Power

Digital TV SoC Subsystem Supply

Use Scenario: Generating 3.3V auxiliary rail for PCI Express graphics cards requiring high peak current and tight line/load regulation.

IC Role / Device Role / Timing Role: Secondary buck controller managing dynamic load transients from GPU frame rendering bursts.

Use Value: 6V/µs slew rate and 10MHz GBW ensure <5% output deviation during 0→15A 10µs load steps-critical for GPU stability.

Use Scenario: Powering video decoder and display interface subsystems in set-top boxes operating from 12V wall adapter input.

IC Role / Device Role / Timing Role: Compact, cost-optimized buck controller delivering multiple low-voltage rails (1.8V, 2.5V, 3.3V) via resistor-programmed feedback.

Use Value: Single-loop voltage-mode architecture reduces external component count versus current-mode alternatives-lowering BOM cost and board space.

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck controller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
RT8205AZSP	Fixed 500kHz frequency; 0.6V reference; no integrated boot diode; requires external bootstrap diode	Better suited for space-constrained portable designs needing higher switching frequency and smaller inductors	Select RT8205AZSP when higher frequency allows smaller magnetics and layout area is premium
ISL6263CRZ	Voltage-mode with 300kHz option; 0.6V reference; includes VID interface for dynamic voltage scaling; no OPS pin for lossless OCP	Targeted at CPU VRMs with adaptive voltage positioning and multi-phase capability	Choose ISL6263CRZ only when VID control and multi-phase synchronization are required

Compared with RT8205AZSP and ISL6263CRZ, AP3581BMP-G1 offers unique integration of boot diode and lossless OCP via OPS pin-reducing component count and improving efficiency in cost-sensitive, single-phase 5–12V input systems without VID or multi-phase needs.

Availability

AP3581BMP-G1 is available at Aetrix Electronics and suitable for DDR memory termination, microprocessor core supplies, PCI graphics card power, and digital TV subsystems requiring stable component supply, RoHS-compliant packaging, and long-term industrial availability.

Supply support for AP3581BMP-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

BCD Semiconductor Manufacturing Limited is a Shanghai-based analog and power IC designer specializing in high-efficiency power management solutions for computing, consumer, and industrial markets.

The AP3581 series belongs to BCD's synchronous buck controller product line, engineered for cost-sensitive, single-phase DC-DC conversion in 5V/12V input systems where integration, thermal performance, and protection features are prioritized over programmability.

FAQ

What is the function of the OPS pin on AP3581BMP-G1?

The OPS pin sets the over-current protection threshold by connecting an external resistor to GND. It enables lossless current limiting by sensing voltage drop across the lower MOSFET's R_DS(ON), eliminating the need for a separate current-sense resistor and associated power loss. Typical resistor values range from 10kΩ to 100kΩ depending on desired trip point.

Does AP3581BMP-G1 support start-up into a pre-biased output?

Yes, AP3581BMP-G1 supports controlled start-up into a pre-biased output. During enable, the controller initially holds both UGATE and LGATE low, then ramps COMP voltage gradually to avoid reverse current flow through the output inductor or load. This prevents damage to downstream circuitry in multi-rail systems with staggered power sequencing.

What is the maximum recommended output current for AP3581BMP-G1 in PSOP-8 package?

While not specified as a hard limit, thermal analysis using θ_JA = 50°C/W and T_J(MAX) = 125°C indicates sustained output current up to 6A is achievable with proper PCB copper area (≥2 sq.in. 2oz Cu ground plane) and ambient temperature ≤60°C. Peak currents up to 20A are supported transiently per load-step test data.

How does the built-in bootstrap diode improve design simplicity?

The integrated bootstrap diode eliminates the need for an external discrete diode between BOOT and PHASE, reducing component count by one, saving ~1mm² PCB area, and removing a potential failure point. It supports standard 0.1–0.47µF ceramic bootstrap capacitors and maintains >12V gate drive headroom for robust N-MOSFET enhancement across temperature and load.

AP3581BMP-G1 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width) Exposed Pad

Packaging:: Tube

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-PSOP

AP3581BMP-G1 FAQ

1.How can I place an order for AP3581BMP-G1 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP3581BMP-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 AP3581BMP-G1 reliable?

The price and inventory of AP3581BMP-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP3581BMP-G1 is usually 5 days.

3.What payment methods are accepted for AP3581BMP-G1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP3581BMP-G1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP3581BMP-G1?

AP3581BMP-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP3581BMP-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 AP3581BMP-G1?

For technical support, including AP3581BMP-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP3581BMP-G1 requirements.

6.How does Aetrix verify that AP3581BMP-G1 is sourced from the original manufacturer or authorized distributors?

All AP3581BMP-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 AP3581BMP-G1 meets industry standards.

7.What is the process for return or replacement of AP3581BMP-G1?

All AP3581BMP-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AP3581BMP-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 AP3581BMP-G1 part is unused and in its original packaging.

Return procedure for AP3581BMP-G1:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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