My Inquiry
My Account
Renesas ISL6535CBZ
- Part No.:
- ISL6535CBZ
- Manufacturer:
- Renesas
- Category:
- DC DC Switching Controllers
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ISL6535CBZ.pdf
- Description:
- IC REG CTRLR BUCK 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,496
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ISL6535CBZ from Renesas Electronics (formerly Intersil) is a synchronous buck PWM controller IC designed for high-performance DC/DC conversion in CPU and GPU power delivery. It delivers 0.597V internal reference with ±1% regulation over 0°C to +70°C, supports 50kHz–1.5MHz programmable switching frequency, and integrates dual 12V gate drivers (1.25A source/2A sink high-side; 2A source/3A sink low-side) for driving two N-channel MOSFETs.
For engineers reviewing the ISL6535CBZ datasheet, ISL6535CBZ pinout, ISL6535CBZ application, or ISL6535CBZ equivalent, this page provides verified technical context on voltage-mode control architecture, rDS(ON)-based overcurrent protection, prebiased load startup capability, soft-start timing, and SOIC-14 package-specific pin mapping - all confirmed for the ISL6535CBZ variant.
Technical Context
The ISL6535CBZ implements voltage-mode PWM control using a triangle-wave oscillator with adjustable frequency (50kHz–1.5MHz), full 0%–100% duty cycle support, and leading/falling edge modulation. Its error amplifier delivers 15MHz gain-bandwidth product and 6V/µs slew rate for fast transient response in high-bandwidth converter designs.
Overcurrent protection uses high-side MOSFET rDS(ON) sensing via OCSET pin with 200µA current source and 120ns blanking time; it operates without external current-sense resistors. The device supports safe startup into prebiased outputs by holding UGATE at PHASE and LGATE at PGND until control loop stabilization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 0.597V ±1% over 0°C to +70°C - enables precise low-voltage regulation for modern CPUs/GPUs |
| Switching Frequency Range | 50kHz to 1.5MHz - selectable via RT-to-GND or RT-to-VCC resistor; allows optimization of size vs efficiency |
| Gate Drive Capability | High-side: 1.25A source / 2A sink at 12V; low-side: 2A source / 3A sink at 12V - drives standard N-MOSFETs without external buffers |
| Error Amplifier GBW | 15MHz - supports high-loop bandwidth for sub-100ns load transient recovery in VRM applications |
| OCP Sensing Method | rDS(ON) of upper MOSFET with 120ns blanking - eliminates sense resistor, reduces BOM cost and PCB area |
| Soft-Start Current | 30µA - linear ramp of SS pin enables predictable output voltage rise time with external CSS capacitor |
| Operating Temperature | 0°C to +70°C - commercial-grade rating suitable for desktop, graphics card, and industrial embedded power rails |
Pinout & Package
ISL6535CBZ is packaged in a 14-lead SOIC (M14.15) with exposed pad not connected internally; GND and PGND pins carry bias current. Thermal resistance θJA = 80°C/W (free-air).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RT) | Oscillator frequency set | Resistor-to-GND sets 200kHz–1.5MHz; resistor-to-VCC extends down to 50kHz - enables wide frequency tuning |
| 2 (OCSET) | Overcurrent threshold input | 200µA current source develops voltage across ROCSET; compared to PHASE node voltage - enables rDS(ON) current sensing |
| 3 (SS) | Soft-start timing control | 30µA internal current charges external CSS capacitor - determines output voltage ramp time during startup |
| 4 (COMP) | Error amplifier output | Drives external compensation network (R/C) - connects to feedback loop integrator for stability tuning |
| 5 (FB) | Error amplifier inverting input | Connects to resistor divider from VOUT - closes voltage regulation loop with internal 0.597V reference |
| 6 (EN) | Enable/disable control | TTL-compatible input; <0.8V disables IC, discharges SS, and holds UGATE/LGATE low - supports system-level sequencing |
| 7 (GND) | Signal ground reference | Reference point for FB, COMP, EN, SS, OCSET - must be low-impedance connection to minimize noise coupling |
| 8 (PHASE) | High-side source / low-side drain node | Connects to source of Q1 and drain of Q2 - used for rDS(ON) sensing and bootstrap return path |
| 9 (UGATE) | High-side MOSFET gate driver output | Drives gate of upper N-MOSFET - requires bootstrap circuit (BOOT–PHASE) for high-side operation |
| 10 (BOOT) | Bootstrap supply input | Provides floating bias for high-side driver - must be capacitively coupled to PHASE node for proper level-shifting |
| 11 (PGND) | Power ground return | Return path for low-side MOSFET source and output inductor - separate from signal GND to reduce noise injection |
| 12 (LGATE) | Low-side MOSFET gate driver output | Drives gate of lower N-MOSFET - referenced to PGND; no bootstrap required |
| 13 (PVCC) | Low-side gate drive supply | +12V ±10% bias for LGATE driver - must be bypassed to PGND with local ceramic capacitor |
| 14 (VCC) | IC core supply | +12V ±10% bias for internal logic and high-side driver - must be bypassed to GND with local ceramic capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Voltage-mode PWM control | Single-loop architecture with triangle oscillator - simplifies compensation design versus current-mode; supports full 0–100% duty cycle |
| rDS(ON) overcurrent protection | Eliminates external current-sense resistor - reduces component count, board space, and power loss in high-current VRMs |
| Prebiased load startup | Tri-states drivers until control loop stabilizes - prevents output voltage overshoot when powering already-charged rails |
| 12V gate drivers | Integrated high- and low-side drivers rated for 12V supplies - avoids need for external level-shifters or discrete drivers |
| Programmable oscillator | Adjustable from 50kHz to >1.5MHz via single RT resistor - enables optimization for efficiency (low-f), size (high-f), or EMI (spread-spectrum compatible) |
Applications
| Desktop CPU Power Delivery | Graphics Card VRM |
|---|---|
Use Scenario: Regulating +1.2V to +1.5V core voltage for Intel Pentium™ and AMD Athlon™ processors under dynamic load transients. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing phase control, current sensing, and transient response in multi-phase VRM subsystems. Use Value: 15MHz error amplifier GBW and 6V/µs slew rate enable sub-100ns recovery from 50% load steps - critical for maintaining CPU voltage tolerance during burst activity. |
Use Scenario: Providing tightly regulated +0.8V to +1.35V GPU core rail in discrete graphics cards with high peak current demands (>100A). IC Role / Device Role / Timing Role: High-frequency buck controller operating at 500kHz–1MHz to minimize inductor size while delivering fast transient response. Use Value: 50kHz–1.5MHz frequency programmability allows designers to balance thermal performance and component size - essential for compact GPU PCB layouts. |
| Industrial Embedded DC/DC | Low-Voltage Distributed Power |
Use Scenario: Generating stable +3.3V or +5V intermediate bus from +12V input in factory automation controllers with extended temperature requirements. IC Role / Device Role / Timing Role: Standalone synchronous buck controller supporting industrial temperature range (0°C to +70°C) with robust OCP and soft-start. Use Value: ±1% output regulation accuracy over commercial temp range ensures reliable operation of sensitive analog and digital peripherals without recalibration. |
Use Scenario: Point-of-load regulation for FPGAs, ASICs, or memory modules requiring precise low-voltage rails (e.g., +0.9V DDR termination) in telecom base stations. IC Role / Device Role / Timing Role: Efficient 12V-input buck controller delivering high current density with minimal external components. Use Value: rDS(ON)-based OCP eliminates sense resistor losses - improves efficiency in high-current, thermally constrained PoL applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL6522CRZ | Pin-compatible predecessor with identical SOIC-14 footprint but narrower frequency range (200kHz–1MHz) and no REFIN/SSDONE pins | Lacks external reference input and soft-start done signal - unsuitable for tracking or multi-rail sequencing designs | Select ISL6522CRZ only if legacy compatibility or lower-cost sourcing is prioritized over extended frequency range and advanced features |
| MP2940AGQSE | Monolithic 30V-input buck controller with integrated MOSFETs; different topology (integrated vs controller-only); no rDS(ON) OCP | Designed for lower-power applications (<30A); lacks flexibility for discrete high-current MOSFET selection and thermal management | Choose MP2940AGQSE for space-constrained, lower-current designs where integration outweighs discrete power stage control |
Compared with ISL6535CBZ, ISL6522CRZ offers backward compatibility but sacrifices frequency flexibility and feature set, while MP2940AGQSE trades discrete power stage control for integration - making ISL6535CBZ optimal for high-current, thermally managed, and multi-rail sequenced CPU/GPU VRMs.
Availability
ISL6535CBZ is available at Aetrix Electronics and suitable for desktop CPU power delivery, graphics card VRMs, and industrial embedded DC/DC converters requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for ISL6535CBZ 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 acquired Intersil in 2017 and maintains its high-performance analog and power management portfolio. Renesas is a global semiconductor leader focused on embedded solutions for automotive, industrial, and data infrastructure markets.
The ISL6535CBZ belongs to Renesas' legacy Intersil VRM controller family, engineered specifically for high-efficiency, high-transient-response CPU and GPU power delivery in computing and graphics applications.
FAQ
What is the maximum switching frequency supported by the ISL6535CBZ?
The ISL6535CBZ supports a maximum switching frequency of over 1.5MHz when configured with RT pin tied to GND via appropriate resistor. This high-frequency capability enables compact magnetics and faster transient response in CPU/GPU VRM designs. The ISL6535CBZ achieves this using an internal triangle-wave oscillator with programmable ramp amplitude and stable timing characteristics across temperature.
Does the ISL6535CBZ support startup into a prebiased output?
Yes, the ISL6535CBZ supports safe startup into prebiased loads. During initial soft-start, the UGATE and LGATE outputs remain tri-stated (UGATE held at PHASE, LGATE held at PGND) until the control loop enters its linear region - preventing output voltage overshoot. This behavior is explicitly documented in the FN9255 datasheet and applies to the ISL6535CBZ variant.
What package type is used for the ISL6535CBZ?
The ISL6535CBZ uses a 14-lead SOIC package (M14.15) with commercial temperature range (0°C to +70°C). Unlike the QFN variants (e.g., ISL6535CRZ), the ISL6535CBZ does not include REFIN or SSDONE pins. Its exposed pad is non-functional and must not be used for thermal conduction - GND and PGND pins carry all bias currents.
How does overcurrent protection work on the ISL6535CBZ?
The ISL6535CBZ implements overcurrent protection using the rDS(ON) of the high-side MOSFET. An internal 200µA current source develops a voltage across ROCSET, which is compared to the voltage drop across the MOSFET's channel (measured at PHASE). A 120ns blanking period rejects switching noise. This method eliminates the need for a discrete current-sense resistor - a key feature confirmed for the ISL6535CBZ in the FN9255 datasheet.
What is the purpose of the RT pin on the ISL6535CBZ?
The RT pin on the ISL6535CBZ sets the oscillator switching frequency. Connecting RT to GND with a resistor selects 200kHz–1.5MHz; connecting RT to VCC extends the range down to 50kHz. Equation 1 and Equation 2 in the FN9255 datasheet define exact resistor values. This programmability allows designers to optimize the ISL6535CBZ for efficiency, size, or EMI requirements in final application.
ISL6535CBZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- 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):
- 10.8V ~ 13.2V
- Frequency - Switching:
- 200kHz
- Duty Cycle (Max):
- 100%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable, Frequency Control, Soft Start
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
ISL6535CBZ FAQ
1.How can I place an order for ISL6535CBZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6535CBZ 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 ISL6535CBZ reliable?
The price and inventory of ISL6535CBZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6535CBZ is usually 5 days.
3.What payment methods are accepted for ISL6535CBZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6535CBZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6535CBZ?
ISL6535CBZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6535CBZ 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 ISL6535CBZ?
For technical support, including ISL6535CBZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6535CBZ requirements.
6.How does Aetrix verify that ISL6535CBZ is sourced from the original manufacturer or authorized distributors?
All ISL6535CBZ 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 ISL6535CBZ meets industry standards.
7.What is the process for return or replacement of ISL6535CBZ?
All ISL6535CBZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL6535CBZ, 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 ISL6535CBZ part is unused and in its original packaging.
Return procedure for ISL6535CBZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISL6535CBZ Tags
-
UCC28C45DR
Texas Instruments
-
UCC28C40DR
Texas Instruments
-
UCC28C43DR
Texas Instruments
-
ZXSC410E6TA
Diodes Incorporated
-
LM3524DMX/NOPB
Texas Instruments
-
LM3489MMX/NOPB
Texas Instruments
-
MIC2102YML-TR
Microchip Technology
-
LM5148RGYR
Texas Instruments
-
TL598CDR
Texas Instruments
-
LM5155DSSR
Texas Instruments
-
LM25085MYX/NOPB
Texas Instruments
-
UCC2813DTR-0
Texas Instruments
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
