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Diodes Incorporated AP3595FNTR-G1
- Part No.:
- AP3595FNTR-G1
- Manufacturer:
- Diodes Incorporated
- Category:
- DC DC Switching Controllers
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
AP3595FNTR-G1.pdf
- Description:
- IC REG CTRLR BUCK U-QFN4040-24
- Quantity:
- Payment:
- Shipping:
Inventory:4,502
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Product details
Overview
AP3595FNTR-G1 from Diodes Incorporated is a dual-phase synchronous-rectified buck controller in U-QFN4040-24 package, delivering up to 60A output current with adjustable switching frequency (50–1000 kHz per phase), integrated 12V+12V bootstrapped gate drivers, and built-in bootstrap diodes. It regulates low-output-voltage rails for GPU and high-end desktop memory core power with precise 2.0V reference voltage (±5 mV accuracy) and adaptive shoot-through protection.
For engineers reviewing the AP3595FNTR-G1 datasheet, AP3595FNTR-G1 pinout, AP3595FNTR-G1 application, or AP3595FNTR-G1 equivalent, key selection considerations include dual-phase current balancing via RDS(ON) sensing, dynamic VID-adjustable output voltage, PSI-controlled phase shedding, and RoHS-compliant lead-free packaging with halogen/antimony-free "Green" certification.
Technical Context
The AP3595FNTR-G1 implements single-loop voltage-mode control with external compensation, using an error amplifier (80 dB DC gain, 20 MHz GBW) and PWM comparators referenced to a 3.5V ramp. Its dual-phase architecture supports interleaved operation with programmable dead time (~50 ns) and adaptive shoot-through protection monitored at HG/LG/PHASE pins.
Current sensing employs two independent methods: RDS(ON)-based phase current sampling (with IOFS-adjustable balance) and DCR-based total output current sensing (via CSP/CSN differential inputs). Protection includes OVP/UVP (±300 mV on FB–VSS), overtemperature shutdown at +150°C, and adjustable overcurrent threshold via DCR network.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Up to 60A total across two phases - enables high-power, low-voltage CPU/GPU core rails without external current-sharing controllers. |
| Switching Frequency | 50–1000 kHz per phase, set by RT/EN resistor - allows optimization of efficiency vs. size for 12V input systems. |
| Reference Voltage | 2.0V ±5 mV (VREF), dynamically adjustable via REFIN/VID - supports precise, programmable output regulation down to sub-1V levels. |
| Gate Drive Capability | 12V+12V bootstrapped drivers with integrated diodes - eliminates external bootstrap diodes and reduces PCB area and BOM count. |
| Current Sensing | RDS(ON) phase sensing + DCR output sensing - enables accurate per-phase balancing and system-level OCP without sense resistors. |
| Protection Features | OVP/UVP (±300 mV), OTP (+150°C), adaptive shoot-through prevention - ensures robust operation under transient, fault, and startup conditions. |
| Package | U-QFN4040-24 (4.0 mm × 4.0 mm, 0.5 mm pitch, exposed thermal pad) - provides low thermal resistance (θJA = 40°C/W) for high-current applications. |
Pinout & Package
AP3595FNTR-G1 is housed in a thermally enhanced U-QFN4040-24 (FN) package with 24 signal terminals and an exposed thermal pad (EP) tied to GND. The package supports high-density layout and efficient heat dissipation in compact VRM designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 REFIN | External reference input | Accepts voltage divider from VREF to set regulated output voltage; enables dynamic VID adjustment when combined with RSET/VID. |
| 13 BOOT1 / 22 BOOT2 | Bootstrap supply for upper gate drivers | Forms floating 12V bias for HG1/HG2 using external capacitors; internal diode eliminates need for discrete bootstrap diodes. |
| 14 HG1 / 21 HG2 | Upper gate driver outputs | Drive gates of high-side MOSFETs; monitored for adaptive shoot-through protection to prevent cross-conduction. |
| 15 PHASE1 / 20 PHASE2 | Switch node connections | Connect to source of high-side and drain of low-side MOSFETs; serve as return path for bootstrap circuits and shoot-through detection points. |
| 16 LG1 / 19 LG2 | Lower gate driver outputs | Drive gates of low-side MOSFETs; monitored for adaptive shoot-through protection and phase current sensing timing. |
| 4 IOFS | Current balance adjustment | Resistor-to-VREF or GND sets inter-phase current sharing offset - critical for stable load distribution in dual-phase operation. |
| 12 PSI | Power saving mode control | Voltage threshold (1.2 V high / 0.4 V low) selects dual- or single-phase operation - enables dynamic phase shedding under light load. |
| 3 RT/EN | Frequency setting & enable | Resistor-to-GND sets fSW; pulled low to disable IC - integrates frequency programming and global enable into one pin. |
| 5 COMP / 6 FB | Error amplifier loop interface | COMP is EA output; FB is inverting input - used together with external RC network for stability tuning of voltage-mode control loop. |
| 11 CSP / 10 CSN | Differential current sense inputs | Measure voltage across DCR network to derive total output current - used for droop control and overcurrent protection. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 12V+12V bootstrapped drivers with internal diodes | Reduces external component count by ≥2 diodes and associated routing; simplifies layout and improves reliability in high-frequency VRMs. |
| Adjustable current balancing via RDS(ON) sensing | Eliminates need for precision current-sense resistors per phase; uses intrinsic MOSFET on-resistance for accurate, temperature-compensated phase matching. |
| Dual-phase operation with PSI-controlled phase shedding | Enables seamless transition between 2-phase (high load) and 1-phase (light load) modes - improves light-load efficiency without external logic. |
| Precise 2.0V reference with ±5 mV accuracy and <10 µV/°C drift | Ensures tight output voltage regulation (<±0.5%) across line, load, and temperature - critical for sub-1V GPU/memory rails. |
| Adaptive shoot-through protection with PHASE/HG/LG monitoring | Dynamically adjusts dead time based on real-time switch transitions - prevents shoot-through without fixed timing penalties or external delay circuits. |
Applications
| GPU Core Power Supply | Desktop Memory Core VRM |
|---|---|
|
Use Scenario: High-current, low-voltage power delivery to NVIDIA/AMD GPU cores requiring fast transient response and tight voltage tolerance. IC Role / Device Role / Timing Role: Dual-phase synchronous buck controller managing 40–60A output with interleaved switching and adaptive phase shedding. Use Value: Delivers <±5 mV output regulation at 0.8–1.2V while maintaining >90% efficiency across 10–100% load range via RDS(ON) current balancing and PSI mode control. |
Use Scenario: DDR4/DDR5 memory subsystem power in high-end desktop motherboards where space, thermal density, and ripple suppression are critical. IC Role / Device Role / Timing Role: Primary voltage regulator controller driving dual-phase power stages with DCR current sensing and dynamic VID tracking. Use Value: Achieves <10 mV p-p output ripple and <5 µs load-step recovery using external compensation and fast-error-amplifier (20 MHz GBW) design. |
| Low-Voltage High-Density DC-DC Converter | Voltage Regulator Module (VRM) |
|
Use Scenario: Compact 12V-input, sub-1V-output converters for AI accelerators and FPGA I/O banks where PCB area and thermal management are constrained. IC Role / Device Role / Timing Role: Dual-phase buck controller with U-QFN4040-24 package and exposed thermal pad enabling high power density (>800 W/in³). Use Value: Supports 50–1000 kHz switching to optimize inductor size vs. conduction loss; integrated bootstrap diodes reduce footprint by ~12 mm² per phase. |
Use Scenario: Standardized VRM implementation for server and workstation platforms requiring compliance with Intel VRD or AMD SVI2 specifications. IC Role / Device Role / Timing Role: Programmable VRM controller supporting VID command interface, PSI signaling, and PMBus-compatible telemetry via analog feedback paths. Use Value: Enables full VRM functionality including droop control, OCP, UVP/OVP, and thermal shutdown - all within single IC without auxiliary supervisors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-phase synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL6367IRZ-T | Triple-phase capable, supports SVI2 interface, no integrated bootstrap diodes - requires external diodes and higher gate drive voltage margin. | Targeted at server VRMs with multi-phase scalability; lacks PSI pin for automatic phase shedding - requires external GPIO control. | Choose when needing >2 phases or digital interface support; avoid if minimizing BOM count and board space is priority. |
| RT8803GQW | Single-chip dual-phase controller with integrated MOSFET drivers but no built-in bootstrap diodes; supports 300–1000 kHz fSW and 60A max. | Optimized for notebook VRMs; uses different current sensing (single DCR only) and lacks RDS(ON) phase balancing - less accurate under mismatched MOSFETs. | Prefer for cost-sensitive portable designs; not recommended for high-precision GPU/core rail applications requiring per-phase current matching. |
Compared with ISL6367IRZ-T and RT8803GQW, the AP3595FNTR-G1 uniquely combines integrated bootstrap diodes, RDS(ON)-based current balancing, and PSI-controlled phase shedding in a 4×4 mm package - making it optimal for space-constrained, high-efficiency dual-phase GPU/memory VRMs where BOM reduction and accuracy are critical.
Availability
AP3595FNTR-G1 is available at Aetrix Electronics and suitable for GPU core power supplies, high-end desktop memory VRMs, and low-voltage high-density DC-DC converters requiring stable component supply despite its obsolete status.
Supply support for AP3595FNTR-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 semiconductor company specializing in discrete, analog, and mixed-signal solutions for power management, signal integrity, and connectivity applications.
The AP3595 belongs to Diodes' high-performance power controller product line, designed specifically for high-current, low-voltage VRM applications in graphics cards, servers, and high-end computing platforms.
FAQ
Is AP3595FNTR-G1 still in production?
No - AP3595FNTR-G1 is officially obsolete and discontinued by Diodes Incorporated as of May 2019. However, Aetrix Electronics maintains limited legacy inventory with full traceability and offers lifecycle coordination support for ongoing production programs requiring last-time buys or drop-in alternatives.
What is the function of the PSI pin on AP3595FNTR-G1?
The PSI (Power Saving Interface) pin controls automatic phase shedding: applying >1.2V enables dual-phase operation, while <0.4V forces single-phase mode. A 2 ms delay occurs during dual-to-single transition, but no delay exists for single-to-dual - enabling rapid response to load increases without firmware intervention.
Can AP3595FNTR-G1 operate without external bootstrap diodes?
Yes - the AP3595FNTR-G1 integrates internal bootstrap diodes for both BOOT1 and BOOT2 pins, eliminating the need for external diodes. This reduces component count, PCB area, and potential failure points while maintaining reliable 12V gate drive for high-side MOSFETs in each phase.
How does AP3595FNTR-G1 achieve current balancing between phases?
It uses RDS(ON) current sensing: the GM amplifier measures voltage drop across the low-side MOSFET's on-resistance during conduction, converts it to a current signal (ICS1/ICS2), and adjusts duty cycles dynamically. The IOFS pin allows fine-tuning of inter-phase offset to compensate for MOSFET parameter mismatches.
AP3595FNTR-G1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 24-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 2
- Output Phases:
- 2
- Voltage - Supply (Vcc/Vdd):
- 10.8V ~ 13.2V
- Frequency - Switching:
- 50kHz ~ 1MHz
- Duty Cycle (Max):
- 40%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable, Frequency Control, Phase Control, Soft Start
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- U-QFN4040-24
AP3595FNTR-G1 FAQ
1.How can I place an order for AP3595FNTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP3595FNTR-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 AP3595FNTR-G1 reliable?
The price and inventory of AP3595FNTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP3595FNTR-G1 is usually 5 days.
3.What payment methods are accepted for AP3595FNTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP3595FNTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP3595FNTR-G1?
AP3595FNTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP3595FNTR-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 AP3595FNTR-G1?
For technical support, including AP3595FNTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP3595FNTR-G1 requirements.
6.How does Aetrix verify that AP3595FNTR-G1 is sourced from the original manufacturer or authorized distributors?
All AP3595FNTR-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 AP3595FNTR-G1 meets industry standards.
7.What is the process for return or replacement of AP3595FNTR-G1?
All AP3595FNTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AP3595FNTR-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 AP3595FNTR-G1 part is unused and in its original packaging.
Return procedure for AP3595FNTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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