ISL99135B - 35A QFN DrMOS Power Module | Renesas
MPN: ISL99135B ✗ End of Life| Qty | Unit Price | Extended |
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| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
ISL99135B Overview
A DrMOS module is an integrated driver-and-switch power stage used to place the control and switching functions close to the power conversion path. Its position in the power hierarchy is DrMOS module, integrated power stage, synchronous buck converter, DC/DC converter, and power-management IC. Integrating the driver and MOSFETs can reduce external switching-path inductance and simplify high-current converter layouts while retaining the regulation functions of an upstream controller.
The verified product information identifies ISL99135B as a 25A/35A device with diode emulation and PS4. Its integrated Schottky bootstrap diode supports the high-side driver arrangement required by a synchronous buck stage. The 24-terminal QFN package and stated 35A capability make the module relevant to compact, high-frequency power-conversion designs where external discrete high-side and low-side MOSFET arrangements become layout-constrained. Detailed electrical limits and switching characteristics remain subject to the manufacturer datasheet.
The ISL99135B is intended for high-density synchronous DC/DC power conversion, particularly designs using an external multiphase or voltage-regulator controller. Its integrated driver and MOSFET pair reduce the number of discrete power devices that must be placed around the switching node. Diode emulation can be useful when the design requires controlled negative inductor current behavior, while PS4 support identifies a specific Renesas power-stage feature whose exact implementation must be confirmed from the datasheet.
Typical applications include CPU and GPU voltage-regulator modules, server and networking power conversion, point-of-load supplies, telecommunications equipment, and other compact high-current rails. For these systems, the 5V input range, integrated DrMOS architecture, 25A/35A current classification, and 24-terminal QFN package are the primary selection points. The controller, inductor, input capacitors, output capacitors, and layout still determine whether the complete converter meets transient, thermal, and efficiency targets.
Designers should verify the exact pinout, electrical limits, recommended gate-drive conditions, thermal data, and exposed-pad connection directly from the Renesas datasheet before layout release. High-current DrMOS layouts require short switching paths, carefully placed input and output capacitors, adequate copper for thermal dissipation, and layout techniques that minimize high-di/dt loops. The QFN module should be treated as a power semiconductor package when evaluating thermal and safe-operating-area requirements.
Drop-in alternatives for ISL99135B — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with ISL99135B (same form factor and footprint) — differing in Package, Rated Current.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ISL99125B
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View Datasheet →ISL99135B Maximum Ratings & Electrical Characteristics
| Product Type | DrMOS power module |
| Rated Current | 25A/35A |
| Minimum Input Voltage | 4.75 V |
| Maximum Input Voltage | 5.25 V |
| Nominal Input Voltage | 5 V |
| Input Voltage Range | 4.75 V to 5.25 V |
| Integrated Circuit | High-performance FET driver and MOSFETs |
| Integrated Diode | Integrated Schottky bootstrap diode |
| Switching Topology | Synchronous DC/DC power conversion |
| Diode Emulation | Supported |
| PS4 Support | Supported |
| Package | 24-terminal QFN |
| Terminal Count | 24 terminals |
| Mounting Type | Surface mount |
| Application Category | High-density synchronous buck converter |
ISL99135B 24-terminal qfn Pin Configuration Guide
Pin configuration for ISL99135B (24-terminal qfn package). This power device features gate, drain, and source terminals. For non-polarized packages, refer to the manufacturer datasheet for exact pin 1 orientation and footprint details. Common applications include power supply design, motor driving, and load switching.
No detailed pinout data available for ISL99135B.
Refer to the datasheet for full pin configuration.
Typical Applications
ISL99135B is suitable for 6 applications: CPU Voltage-Regulator Module, GPU Power Converter, Point-of-Load 5V Rail, Telecommunications Power Conversion, High-Frequency Buck Converter, High-Current Embedded Power Rail.
CPU Voltage-Regulator Module
The ISL99135B fits a CPU regulator module when the design operates from a 4.75V-to-5.25V input rail and needs an integrated high-current DrMOS stage. Its verified 25A/35A classification supports planning around high-load processors, while the integrated driver and MOSFETs can reduce the number of discrete switching components. The external controller, inductor, input/output capacitors, and layout must be selected together to meet transient response and thermal limits.
Recommended
GPU Power Converter
The ISL99135B is applicable to high-current GPU power conversion because it combines a driver and MOSFET pair in one DrMOS module and is identified for 25A/35A operation. A compact switching stage can help minimize routing distance between the module, inductor, and capacitors, but the converter still requires controller validation for load transients, current limiting, and rail sequencing. The 5V input specification must be checked against the complete power architecture.
Recommended
Point-of-Load 5V Rail
For a 5V-class point-of-load supply, the ISL99135B provides an integrated synchronous power stage with a verified 4.75V minimum and 5.25V maximum input specification. The module is suited to designs where external discrete MOSFETs would increase layout complexity or switching-loop inductance. Proper operation depends on selecting the inductor and capacitors for the target ripple, efficiency, transient response, and thermal environment.
Recommended
Telecommunications Power Conversion
The ISL99135B can support compact synchronous buck stages in telecommunications and networking equipment where the module's 25A/35A rating and integrated DrMOS architecture are useful. Its 5V input range aligns with common 5V-class intermediate rails, although the final design must respect the telecom system's load steps, ambient temperature, fault behavior, and reliability requirements. Controller and magnetics selection remain application-specific.
Recommended
High-Frequency Buck Converter
The ISL99135B is specifically positioned for high-frequency synchronous DC/DC conversion. Integrating the FET driver and MOSFETs can shorten the power-stage implementation path and reduce the number of external devices compared with a discrete switch arrangement. The benefit depends on careful layout of the high-di/dt switching loop and on selecting an inductor and capacitors that support the intended frequency without exceeding current or thermal ratings.
Recommended
High-Current Embedded Power Rail
The ISL99135B is suitable as a candidate power stage for embedded systems requiring a compact high-current 5V-derived rail. The integrated DrMOS package can simplify assembly compared with separate driver and MOSFET implementations, while the 24-terminal QFN requires a layout that follows the official pin and exposed-pad drawings. Confirm controller compatibility, current sharing, fault response, and thermal performance before production release.
Recommended
Engineering reference data for ISL99135B — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ISL99125B |
|---|---|---|
| Package | 24-terminal QFN | 24-terminal QFN family package |
| Brand | Renesas Electronics | Renesas Electronics |
| Product Type | DrMOS power module | DrMOS power module |
| Rated Current | 25A/35A | 25A/35A family classification |
| Integrated Driver | Yes | Yes |
| Integrated Bootstrap Diode | Integrated Schottky bootstrap diode | Integrated Schottky bootstrap diode |
| Diode Emulation | Supported | Supported |
| Switching Topology | Synchronous DC/DC power conversion | Synchronous DC/DC power conversion |
Key Differentiators
- Integrated DrMOS power stage (vs ISL99125B)
- Specified 25A/35A current classification (vs ISL99125B)
- Diode-emulation and PS4 feature labeling (vs ISL99125B)
Design Notes
Use the manufacturer reference layout as the controlling document. Keep the DrMOS module, inductor, high-frequency input capacitors, and output capacitors in a compact power-conversion loop to limit parasitic inductance in the high-di/dt path. Do not infer land geometry from the QFN package name alone; confirm pad dimensions, pin numbering, exposed-pad connections, and copper-clearance requirements from the Renesas package drawing.
Treat ISL99135B as a power-semiconductor package and validate junction temperature at the intended current, output voltage, ambient temperature, and PCB copper area. The supplied snippets do not provide thermal resistance or power-loss curves, so no thermal calculation is asserted here. Use the datasheet thermal model and controller power-loss estimates before determining whether additional copper or a thermal-management feature is required.
Separate sensitive control signals from the switching node and route the gate-drive and power-current paths as short and direct as practical. The integrated driver and MOSFETs can reduce external component count, but poor routing of the switching loop can still create voltage spikes, ringing, EMI, and unstable converter behavior. Follow the datasheet's recommended layout and test the finished board with the selected inductor and capacitor values.
Do not interpret the 25A/35A label as an unconditional continuous-current guarantee. Current capability depends on test conditions, output voltage, duty cycle, junction temperature, package thermal performance, and the surrounding converter design. Also verify whether the selected controller supports the module's diode-emulation and PS4 functions; those features cannot be treated as generic DrMOS compatibility requirements.
Compliance Information
No explicit compliance declarations were included in the verified web data. Obtain current manufacturer or authorized-distributor documentation before making a compliance determination.
