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

Diodes Incorporated AP3598AFNTR-G1

Name: AP3598AFNTR-G1
Brand: Diodes Incorporated
SKU: AP3598AFNTR-G1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP3598AFNTR-G1

Manufacturer:: Diodes Incorporated

Category:: DC DC Switching Controllers

Package:: 24-VFQFN Exposed Pad

Datasheet:: AP3598AFNTR-G1.pdf

Description:: IC REG CTRLR BUCK PSI 24UQFN

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AP3598AFNTR-G1 from Diodes Incorporated is a dual-phase synchronous-rectified buck PWM controller with integrated 12V bootstrapped gate drivers, designed for high-current GPU and CPU VRM applications. It delivers up to 60A total output current, supports R_DS(ON)-based current balancing, features 1% accurate 2.00V reference voltage, and operates across 200–500kHz per phase in U-QFN4040-24 package.

For engineers reviewing the AP3598AFNTR-G1 datasheet, AP3598AFNTR-G1 pinout, AP3598AFNTR-G1 application, or AP3598AFNTR-G1 equivalent, key selection criteria include dual-phase current balance accuracy, bootstrap diode integration, VID-compatible dynamic voltage adjustment, thermal alert signaling (TALERT#), and OCP threshold programmability via LGATE1 resistor.

Technical Context

The AP3598AFNTR-G1 implements single-loop voltage-mode control with external compensation at COMP/VSNS pins, enabling stable regulation under fast load transients. Its oscillator frequency is set by an external resistor on FS pin (270–330kHz typical with 33kΩ), and it supports three power-saving modes-dual-phase FCCM, single-phase FCCM, and single-phase DCM-via multilevel PSI input (0.4V/0.8–1.1V/1.5V thresholds).

Current balancing uses R_DS(ON) sensing on both low-side MOSFETs (PHASE1/PHASE2), with GM amplifiers converting V_DS into proportional current signals (ICS1/ICS2) that dynamically adjust PWM duty cycles. Protection includes overvoltage (1.4×VOUT), undervoltage (0.5×VOUT), overtemperature shutdown (+150°C), and thermal alert (+120°C), all with 50µs response delay.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Current	Up to 60A total across two phases; enables high-power GPU/CPU core rail delivery without external current-sharing IC.
Reference Voltage	2.00V ±1% at 25°C; provides precise feedback for sub-1V output rails with minimal drift over temperature.
Switching Frequency	270–330kHz typical per phase (R_FS = 33kΩ); balances efficiency, EMI, and inductor size for desktop VRMs.
Gate Drive Voltage	12V bootstrapped high-side drive with integrated diodes; eliminates external bootstrap diodes and reduces BOM count.
OCP Threshold	Programmable via LGATE1 resistor: 150mV (5kΩ), 250mV (10kΩ), or disabled (>20kΩ); adapts protection to MOSFET R_DS(ON) variation.
Thermal Alert	TALERT# active-low open-drain output triggers at +120°C; allows system-level thermal throttling before shutdown at +150°C.
VID Interface	5-bit voltage ID input (VID) supports dynamic output voltage adjustment; compatible with Intel VRD/AMD APS specifications.

Pinout & Package

AP3598AFNTR-G1 is housed in a thermally enhanced U-QFN4040-24 package (4.0mm × 4.0mm, 0.5mm pitch) with exposed thermal pad (THERM/GND) for PCB heat sinking.

Pin/Terminal	Circuit Role	Design Meaning
BOOT1 / BOOT2	High-side gate driver supply	Provides floating 12V bias for HGATE1/HGATE2; internal bootstrap diodes eliminate external diodes.
HGATE1 / HGATE2	High-side gate driver output	Drives upper MOSFET gates with 1.2A sourcing capability; supports fast turn-on of 12V logic-level FETs.
LGATE1 / LGATE2	Low-side gate driver output	Drives lower MOSFET gates with 1.2A sourcing; OCP threshold set via resistor on LGATE1.
PHASE1 / PHASE2	Switch node	Connects to source of high-side and drain of low-side MOSFETs; used for R_DS(ON) current sensing.
VSNS / GNDSNS	Differential output voltage sense	Enables remote sensing for <1% output regulation accuracy; rejects PCB IR drop.
COMP	Error amplifier compensation	External RC network sets loop bandwidth and phase margin; supports Type II/III compensation.
FS	Frequency selection	Resistor-to-GND sets switching frequency; 33kΩ yields 300kHz typical per phase.
TALERT# / TSNS	Thermal monitoring interface	TALERT# signals early thermal warning; TSNS accepts NTC thermistor for custom thermal profile.

Key Features

Feature	Design Value
R_DS(ON) current balancing	Real-time per-phase current matching using MOSFET on-resistance-no current-sense resistors required.
Integrated bootstrap diodes	Eliminates two external diodes per phase, reducing layout complexity and improving reliability in compact VRMs.
Dynamic VID voltage control	Supports processor-requested voltage scaling (e.g., Intel SpeedStep, AMD Cool'n'Quiet) via 5-bit analog VID input.
Three-mode power saving	Selectable DCM/FCCM operation via PSI pin-enables light-load efficiency optimization without firmware changes.
Pre-bias start-up	Safely starts into pre-charged output rails (e.g., hot-swap scenarios) by holding both FETs off until REFIN ramps up.

Applications

GPU Power Delivery

CPU Core VRM

Use Scenario: High-performance graphics cards requiring >45A transient current for gaming or AI workloads.

IC Role / Device Role / Timing Role: Dual-phase buck controller managing parallel power stages with synchronized PWM and current-balanced output.

Use Value: Delivers stable 0.8–1.2V core voltage under 100A/µs load steps while minimizing output ripple via interleaved phase timing.

Use Scenario: Desktop motherboard CPU voltage regulator modules supporting Intel LGA1700 or AMD AM5 sockets.

IC Role / Device Role / Timing Role: Primary VRM controller implementing VID-based dynamic voltage/frequency scaling with thermal throttling coordination.

Use Value: Enables precise sub-10mV output regulation across temperature and load, meeting Intel VRD13.0/AMD SVI3 spec compliance.

Server Memory Regulator

AI Accelerator Board

Use Scenario: DDR5 memory subsystems requiring tightly regulated 1.1V VDD/VDDQ rails with fast transient response.

IC Role / Device Role / Timing Role: Secondary VRM controller delivering low-noise, high-PSRR power to memory PHYs and controllers.

Use Value: Achieves <1% output deviation during 20A step loads using remote sensing and adjustable soft-start to prevent data corruption.

Use Scenario: PCIe-based AI inference accelerators with FPGA or ASIC cores demanding scalable 0.75–0.95V core rails.

IC Role / Device Role / Timing Role: Configurable multi-phase controller supporting dynamic voltage binning and thermal-aware power capping.

Use Value: Leverages TALERT# and TSNS to coordinate with host firmware for real-time power budgeting and thermal derating.

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 up to 120A; requires external bootstrap diodes; no integrated TALERT# output.	Targeted at server CPU VRMs with higher phase count; lacks direct thermal alert signaling for edge AI boards.	Choose when scaling beyond 60A or needing third phase; accept added BOM and routing complexity.
RT8803AGQW	Single-phase only; 1% VREF; supports 200–1000kHz; includes digital I²C interface for telemetry.	Designed for space-constrained client platforms; lacks current balancing and dual-phase coordination logic.	Choose for cost-sensitive single-rail designs where phase count and analog balancing are unnecessary.

Compared with ISL6367IRZ-T and RT8803AGQW, AP3598AFNTR-G1 uniquely combines dual-phase R_DS(ON) balancing, integrated bootstrap diodes, and dedicated thermal alert signaling-making it optimal for mid-tier GPU and desktop CPU VRMs where BOM reduction and thermal responsiveness are prioritized over phase scalability or digital telemetry.

Availability

AP3598AFNTR-G1 is available at Aetrix Electronics and suitable for GPU power delivery, CPU core VRMs, DDR5 memory regulators, and AI accelerator board designs requiring stable component supply and legacy design support.

Supply support for AP3598AFNTR-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 ICs for power management, signal integrity, and connectivity applications.

The AP3598A product line targets high-efficiency, high-current DC-DC conversion in graphics and computing systems-designed specifically for compact, thermally constrained VRM implementations with minimal external components.

FAQ

What is the function of the THERM/GND pin on AP3598AFNTR-G1?

The THERM/GND pin serves a dual purpose: it is the exposed thermal pad connection for PCB heat dissipation and must be soldered to a solid GND plane, and it also functions as the thermal sensor reference point for the internal temperature monitor. This pin directly interfaces with the die junction to enable accurate thermal alerting and shutdown at +120°C and +150°C respectively, without requiring external sensors.

Can AP3598AFNTR-G1 operate with only one phase enabled?

Yes, AP3598AFNTR-G1 supports single-phase operation via the PSI pin: applying 0.4V selects DCM mode (single-phase, variable frequency), while 0.8–1.1V selects FCCM mode (single-phase, fixed frequency). In single-phase mode, only PHASE1/LGATE1/HGATE1/BOOT1 are active; PHASE2-related pins remain idle, and current balancing is disabled.

How does the R_DS(ON) current sensing work without external sense resistors?

The AP3598AFNTR-G1 measures voltage drop across the low-side MOSFET's intrinsic R_DS(ON) during conduction (when LGATE is high and PHASE is near GND). An internal GM amplifier converts this V_DS into a proportional current (ICS1/ICS2), which is sampled and held to generate real-time phase current signals used for dynamic duty-cycle adjustment-eliminating need for Kelvin-connected shunt resistors.

Is AP3598AFNTR-G1 still recommended for new designs despite its obsolete status?

No-AP3598AFNTR-G1 is officially discontinued by Diodes Incorporated (per DS37261 Rev. 3-4, May 2019). While Aetrix Electronics maintains limited legacy stock for repair and continuity, Diodes recommends migration to the AP3598B or AP3599 series for new designs, which offer enhanced thermal performance, updated protection thresholds, and extended lifecycle support.

AP3598AFNTR-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):: 4.5V ~ 13.2V

Frequency - Switching:: 200kHz ~ 500kHz

Duty Cycle (Max):: 40%

Synchronous Rectifier:: Yes

Clock Sync:: No

Serial Interfaces:: PSI

Control Features:: Enable, Frequency Control, Phase Control, Power Good

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: U-QFN4040-24

AP3598AFNTR-G1 FAQ

1.How can I place an order for AP3598AFNTR-G1 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP3598AFNTR-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 AP3598AFNTR-G1 reliable?

The price and inventory of AP3598AFNTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP3598AFNTR-G1 is usually 5 days.

3.What payment methods are accepted for AP3598AFNTR-G1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP3598AFNTR-G1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP3598AFNTR-G1?

AP3598AFNTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP3598AFNTR-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 AP3598AFNTR-G1?

For technical support, including AP3598AFNTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP3598AFNTR-G1 requirements.

6.How does Aetrix verify that AP3598AFNTR-G1 is sourced from the original manufacturer or authorized distributors?

All AP3598AFNTR-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 AP3598AFNTR-G1 meets industry standards.

7.What is the process for return or replacement of AP3598AFNTR-G1?

All AP3598AFNTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AP3598AFNTR-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 AP3598AFNTR-G1 part is unused and in its original packaging.

Return procedure for AP3598AFNTR-G1:

1.Submit a request within 90 days.

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

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