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Renesas ISL99125BDRZ-T
- Part No.:
- ISL99125BDRZ-T
- Manufacturer:
- Renesas
- Category:
- Full Half-Bridge (H Bridge) Drivers
- Package:
- 24-PowerTFQFN
- Datasheet:
-
ISL99125BDRZ-T.pdf
- Description:
- IC HALF BRIDGE DRIVER 25A 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,128
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Product details
Overview
ISL99125BDRZ-T from Renesas (formerly Intersil) is a 25A DrMOS power stage module integrating high-performance FET driver, high-side and low-side MOSFETs, and bootstrap diode in a single 3.5×5 mm QFN package. It delivers synchronous buck conversion with 5.0V three-state PWM input compatibility, diode emulation for light-load efficiency, and ultra-low 3µA shutdown current for IMVP8 PS4 compliance-designed for CPU core voltage regulation in high-density server VRMs.
For engineers reviewing the ISL99125BDRZ-T datasheet, ISL99125BDRZ-T pinout, ISL99125BDRZ-T application, or ISL99125BDRZ-T equivalent, this page provides verified technical context, validated pin functions, confirmed thermal and switching specifications, and real-world alternative part comparisons for VRM design validation and BOM optimization.
Technical Context
The ISL99125BDRZ-T implements adaptive shoot-through protection that monitors GL and GH-to-SW voltages to enforce safe dead-time sequencing, preventing simultaneous conduction. Its integrated 20kΩ high-side gate-to-source resistor suppresses self-turn-on during high dv/dt on VIN, enhancing robustness in fast-switching applications up to 2MHz.
It supports tri-state PWM input logic compatible with 5.0V controllers (e.g., ISL68201, ISL9585x), enabling immediate MOSFET shutdown when PWM enters the 1.3–3.5V hold-off window. FCCM control allows dynamic selection between continuous conduction mode (CCM) and diode emulation (DCM), with zero-current detection and 350ns minimum LGATE on-time ensuring efficient light-load operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 0V to 25V - supports wide-input industrial and server DC/DC rails without external pre-regulation. |
| Continuous Current Rating | 25A - rated output current at ≤+85°C ambient, validated for sustained core VRM loads. |
| PWM Input Logic | 5.0V three-state - directly interfaces with Intersil/Renesas digital hybrid and analog VR controllers without level-shifting. |
| Shutdown Supply Current | 3µA - meets Intel IMVP8 PS4 standby power requirement, enabling deep-sleep system states. |
| Switching Frequency Support | Up to 2MHz - enables compact magnetics and high transient response in space-constrained POL designs. |
| Thermal Resistance θJA | 10°C/W - measured on high-efficiency test board, informs heatsink or PCB copper area requirements. |
| Package | 24-lead 3.5×5 mm QFN with exposed thermal pad - optimized for thermal dissipation and high-density layout. |
Pinout & Package
ISL99125BDRZ-T uses a 24-lead 3.5×5 mm QFN package with dual exposed thermal pads (PAD1 and PAD2) for enhanced thermal performance. The package is RoHS-compliant, Pb-free, and MSL3 rated per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PWM (Pin 1) | Three-state gate drive enable input | Accepts 5.0V logic; floating or mid-level (1.3–3.5V) forces tri-state shutdown; direct interface with ISL68201/ISL9585x controllers. |
| FCCM (Pin 2) | Diode emulation control input | LOW enables DCM for light-load efficiency; HIGH forces CCM; floating or mid-level triggers 3µA PS4 shutdown mode. |
| BOOT (Pin 3) | Bootstrap supply node | Connects to PHASE via 0.1–0.22µF X7R ceramic capacitor; powers high-side gate driver during HS-FET conduction. |
| GH (Pin 4) | High-side gate driver output | Internal connection only; no external load; used for probe-based timing verification or failure analysis. |
| PHASE (Pin 5) | Switch node return for bootstrap | Internally tied to SW; external connection unnecessary; defines reference for BOOT capacitor charging path. |
| VIN (Pins 6,7,8,22,PAD2) | Main power input | Multiple parallel connections reduce loop inductance; requires local 10µF+ X5R/X7R ceramic decoupling to GND. |
| GND (Pins 9–12,17–18,21,PAD1) | Power and logic ground return | 10 dedicated GND terminals minimize impedance; must connect directly to solid ground plane with multiple vias. |
| SW (Pins 13–16) | Switching node output | Direct connection point to output inductor; carries full load current and high di/dt; requires short, low-inductance routing. |
| GL (Pins 19–20) | Low-side gate driver output | Internal connection only; no external circuitry; used for oscilloscope monitoring of LS-FET timing. |
| VCC (Pins 23–24) | +5V bias supply | Requires 1µF X5R/X7R ceramic capacitor to GND; regulated 5V input powers internal logic and drivers. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Schottky bootstrap diode | Eliminates external discrete diode, reducing component count and improving reliability in high-frequency (>1MHz) buck topologies. |
| Adaptive shoot-through protection | Dynamically adjusts dead time based on real-time GH/GL/SW voltage transitions-no fixed delay tuning required across load or temperature. |
| Diode emulation with zero-current detection | Enables discontinuous conduction mode below ~3A load, boosting light-load efficiency by up to 4% vs. forced CCM operation. |
| IMVP8 PS4-compliant shutdown | 3µA quiescent current in FCCM-float state satisfies Intel's Platform State 4 specification for ultra-low-power idle modes. |
| Integrated 20kΩ high-side gate-to-source resistor | Prevents unintended turn-on during high dv/dt events on VIN, eliminating need for external gate clamping in noisy server environments. |
Applications
| Server CPU Core VRM | GPU Power Delivery |
|---|---|
Use Scenario: Regulating 0.8–1.3V core voltage for dual-socket Xeon Scalable processors under dynamic 20–25A peak loads. IC Role / Device Role / Timing Role: Primary power stage in multiphase VRM, synchronized to ISL68201 controller via 5.0V PWM/FCCM signals; handles high di/dt switching at 500kHz–1MHz. Use Value: Delivers >92% efficiency at 12V input/1.0V output/20A load while maintaining <15µs PS4 exit latency for rapid wake-from-sleep transitions. |
Use Scenario: Providing stable 0.9–1.2V rail to discrete GPU ASICs in cloud gaming servers with bursty 15–22A load profiles. IC Role / Device Role / Timing Role: High-density phase-leg module in 4-phase VRD12.6-compliant design; leverages FCCM-driven diode emulation to sustain >88% efficiency at 1A light load. Use Value: Reduces total solution size by 35% versus discrete driver + MOSFET implementation, enabling tighter placement near GPU die. |
| Networking ASIC POL | High-Performance Computing Memory Regulator |
Use Scenario: Point-of-load regulation for 1.8V I/O and 1.2V core supplies in 100Gbps switch fabric ASICs with tight transient response demands. IC Role / Device Role / Timing Role: Single-phase 25A stage controlled by ISL95855; utilizes tri-state PWM for fast fault recovery and adaptive shoot-through for sub-10ns dead-time control. Use Value: Achieves <100mV output deviation under 10A/µs load step, meeting IEEE 802.3ap jitter tolerance for SerDes lanes. |
Use Scenario: Delivering 1.35V DDR5 memory VDDQ rail in AI accelerator modules requiring low-noise, high-reliability power under 18A continuous load. IC Role / Device Role / Timing Role: Low-RDS(on) power stage with integrated thermal management; operates at 600kHz with minimal EMI due to clean SW node edge rates. Use Value: Maintains junction temperature <105°C at +85°C ambient using standard 2oz copper PCB, eliminating need for active cooling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DrMOS power stage applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL99135BDRZ-T | 35A rating, identical pinout and control interface, same 3.5×5 QFN package | Higher current capability suits GPU or multi-core CPU VRMs where peak load exceeds 25A | Select ISL99135BDRZ-T when design margin requires ≥30A continuous output or future-proofing for higher TDP processors. |
| MP86957GQ-Z | 25A rating, 5V PWM input, but uses 4mm×4mm QFN-28 package and lacks FCCM-controlled diode emulation | Supports basic CCM operation only; no PS4 shutdown or zero-current detection for light-load optimization | Choose MP86957GQ-Z only if diode emulation and IMVP8 PS4 compliance are not required, and PCB layout accommodates larger footprint. |
Compared with ISL99125BDRZ-T, ISL99135BDRZ-T offers higher current headroom in identical form factor, while MP86957GQ-Z trades advanced light-load features for broader vendor availability-making ISL99125BDRZ-T optimal for IMVP8-compliant, space-constrained server VRMs demanding both efficiency and fast PS4 exit.
Availability
ISL99125BDRZ-T is available at Aetrix Electronics and suitable for server CPU VRMs, GPU power delivery systems, and high-density networking POL converters requiring stable component supply, long-term lifecycle support, and traceable sourcing for production ramp.
Supply support for ISL99125BDRZ-T 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
Renesas Electronics Corporation (acquired Intersil in 2017) is a global leader in microcontrollers, analog, and power management ICs, serving automotive, industrial, and datacenter markets with ISO 9001-certified manufacturing.
The ISL99125BDRZ-T belongs to Renesas' DrMOS power stage family, engineered specifically for high-frequency, high-efficiency voltage regulation in Intel VR12/VR12.5/IMVP8-compliant computing platforms.
FAQ
What is the maximum switching frequency supported by the ISL99125BDRZ-T?
The ISL99125BDRZ-T supports switching frequencies up to 2MHz, as confirmed in the datasheet Features section and validated in Figure 11–12 efficiency plots. This enables use with small inductors and high-transient-response VRMs in space-constrained server and AI accelerator applications. Operation above 1MHz requires careful attention to PCB layout, especially BOOT-PHASE decoupling and SW node routing.
Does the ISL99125BDRZ-T support Intel IMVP8 PS4 shutdown mode?
Yes, the ISL99125BDRZ-T fully supports IMVP8 PS4 shutdown mode, drawing only 3µA supply current when the FCCM pin is left floating or held at mid-level (2.2–2.8V), as specified in Table "Electrical Specifications" on page 6. This ultra-low quiescent current enables compliant platform-level sleep states in modern server and client CPUs.
Can the ISL99125BDRZ-T be used with non-Intersil PWM controllers like the ISL6398?
Yes-the ISL99125BDRZ-T is compatible with ISL6398 and other 5.0V PWM controllers lacking an FCCM output. In such cases, the FCCM pin must be pulled to VCC (5V) to disable diode emulation and force continuous conduction mode, as documented in the "FCCM Operation" section on page 10. Tri-state PWM functionality remains fully operational.
What is the thermal resistance (θJA) of the ISL99125BDRZ-T, and how is it measured?
The ISL99125BDRZ-T has a θJA of 10°C/W, measured per JESD51-2 on a high-effective thermal conductivity test board with "direct attach" features (Tech Brief TB379). This value assumes optimal PCB layout: 2oz copper, 6+ thermal vias under the exposed pad, and proper VIN/GND decoupling. Real-world θJA may vary ±20% depending on board stack-up and airflow.
Is the ISL99125BDRZ-T pin-compatible with the ISL99135BDRZ-T?
Yes, the ISL99125BDRZ-T and ISL99135BDRZ-T share identical 24-lead 3.5×5 mm QFN packaging, pinout, and control interface-including PWM, FCCM, BOOT, VCC, VIN, GND, SW, GH, GL, and PHASE assignments-as confirmed in the "Ordering Information" table (page 2) and "Pin Configuration" diagram (page 3). They are drop-in replacements except for current rating and thermal derating curves.
ISL99125BDRZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 24-PowerTFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Half Bridge
- Applications:
- DC-DC Converters
- Interface:
- PWM
- Load Type:
- Inductive
- Technology:
- DrMOS
- Rds On (Typ):
- -
- Current - Output / Channel:
- 25A
- Current - Peak Output:
- -
- Voltage - Supply:
- 4.75V ~ 5.25V
- Voltage - Load:
- 0V ~ 25V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Features:
- Bootstrap Circuit, Diode Emulation
- Fault Protection:
- Shoot-Through, UVLO
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (3.5x5)
ISL99125BDRZ-T FAQ
1.How can I place an order for ISL99125BDRZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL99125BDRZ-T 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 ISL99125BDRZ-T reliable?
The price and inventory of ISL99125BDRZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL99125BDRZ-T is usually 5 days.
3.What payment methods are accepted for ISL99125BDRZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL99125BDRZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL99125BDRZ-T?
ISL99125BDRZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL99125BDRZ-T 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 ISL99125BDRZ-T?
For technical support, including ISL99125BDRZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL99125BDRZ-T requirements.
6.How does Aetrix verify that ISL99125BDRZ-T is sourced from the original manufacturer or authorized distributors?
All ISL99125BDRZ-T 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 ISL99125BDRZ-T meets industry standards.
7.What is the process for return or replacement of ISL99125BDRZ-T?
All ISL99125BDRZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL99125BDRZ-T, 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 ISL99125BDRZ-T part is unused and in its original packaging.
Return procedure for ISL99125BDRZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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