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Renesas ISL6534CV
- Part No.:
- ISL6534CV
- Manufacturer:
- Renesas
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 24-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
ISL6534CV.pdf
- Description:
- IC REG TRPL BCK/LNR SYNC 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,766
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Product details
Overview
ISL6534CV from Renesas (formerly Intersil) is a triple-output voltage regulator IC integrating two synchronous buck PWM controllers (OUT1, OUT2) and one linear controller (OUT3), delivering precision regulation for DDR memory power systems. It supports 0.6V–6V output on buck channels, 0.6V–3.3V on linear channel, 300kHz–1MHz adjustable switching frequency, and operates across 0°C to 70°C in 24-lead EPTSSOP package with exposed thermal pad.
For engineers reviewing the ISL6534CV datasheet, ISL6534CV pinout, ISL6534CV application, or ISL6534CV equivalent, key selection considerations include independent/DDR mode soft-start coordination, 3.3V buffered VTT reference (REFOUT), 12V gate drivers with bootstrapped UGATEs, and PGOOD monitoring of all three regulated rails under fault conditions.
Technical Context
The ISL6534CV implements voltage-mode control for both buck regulators, each with dedicated error amplifiers (COMP1/COMP2), feedback inputs (FB1/FB2), and 12V gate drivers supporting external N-channel MOSFETs. OUT1 uses an internal 0.6V reference; OUT2 accepts external reference via REFIN and supports DDR tracking (e.g., VOUT2 = ½ × VOUT1) or independent 3.3V regulation using VREF.
OUT3 employs a linear controller driving an external N-channel MOSFET with 0.6V reference, while FS_SYNC enables resistor-programmable frequency (300kHz default) or external clock synchronization. PGOOD asserts only after all three SS/EN ramps complete without COMP short detection, providing system-level power-good sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 12V ±10% on VCC12; 5V ±5% or 5.8V shunt-regulated on VCC - supports dual-supply operation with optional 150Ω shunt resistor |
| VOUT Ranges | OUT1/OUT2: 0.6V–6V; OUT3: 0.6V–3.3V - enables DDR VDDQ/VTT and core logic rail generation |
| Switching Frequency | 300kHz (default, FS_SYNC to GND); up to 1MHz (resistor to GND); sync-capable - avoids beat frequencies in multi-regulator systems |
| Reference Voltages | 0.6V (OUT1/OUT3 internal); 3.3V (VREF output); buffered REFIN (REFOUT) - supports precise DDR termination and independent regulation |
| Gate Drive Capability | UGATE/LGATE: 12V-rated, 2Ω source/sink resistance; BOOT pins rated to 36V - drives high-side FETs in buck topologies with robust dead-time control |
| Soft-Start & Enable | Three independent SS/EN pins (30µA current source); DDR mode enabled by tying SS2/EN2 to VCC - enables coordinated startup or independent sequencing |
| PGOOD Logic | Open-drain output asserting high-impedance only after all three outputs complete soft-start with no COMP short - provides reliable system power-up validation |
Pinout & Package
ISL6534CV is housed in a thermally enhanced 24-lead Exposed Pad Thin Shrink Small Outline Package (EPTSSOP), compliant with JEDEC MO-220, featuring a bottom-exposed thermal pad electrically connected to GND for improved heat dissipation and PCB layout efficiency.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SS1/EN1, SS2/EN2, SS3/EN3 | Soft-start/enable input | 30µA current source charges external capacitor; <1.0V disables regulator - enables independent or ganged startup timing |
| BOOT1, BOOT2 | Bootstrap supply input | Provides gate drive voltage for upper MOSFETs; rated to 36V - requires external diode/capacitor network per channel |
| UGATE1, UGATE2 | Upper gate driver output | Drives high-side N-MOSFET gates; voltage referenced to BOOTx - supports 12V bootstrap operation with fast 17ns rise/fall times |
| LGATE1, LGATE2 | Lower gate driver output | Drives low-side N-MOSFET gates; referenced to PGND - delivers 13.2V max drive with matched 2Ω source/sink impedance |
| FB1, FB2, FB3 | Feedback input | Compares divided output voltage to internal 0.6V (OUT1/OUT3) or external REFIN (OUT2) - sets regulation point with ±0.7% typical accuracy |
| REFIN, REFOUT | External reference input/output | REFIN sets OUT2 reference; REFOUT buffers REFIN for VTT generation or phase selection - supports DDR mode with 90° staggered switching |
| VREF | 3.3V reference output | Stable buffered 3.3V source for OUT2 reference or system use - requires 1.1µF max bypass capacitance for stability |
| PGOOD | Power-good indicator | Open-drain output pulled high only when all three regulators complete soft-start and remain fault-free - used for system enable sequencing |
| FS/SYNC | Oscillator control | Resistor-to-GND sets frequency (300kHz–1MHz); external clock input synchronizes switching - eliminates low-frequency interference in multi-IC designs |
Key Features
| Feature | Design Value |
|---|---|
| Dual synchronous buck + linear regulator | Enables single-chip DDR memory power solution (VDDQ, VTT, and auxiliary rail) with minimal external components |
| DDR mode with 90° phase shift | Reduces input ripple RMS current and EMI by staggering LGATE1/LGATE2 edges - improves capacitor utilization and thermal performance |
| Integrated 3.3V VREF and buffered REFOUT | Eliminates need for external reference ICs in DDR applications; REFOUT doubles as VTT buffer or phase-select control |
| Shunt-regulated VCC option | Generates 5.8V ±0.2V from 12V supply using external 150Ω resistor - removes dependency on separate 5V rail |
| Independent soft-start coordination | Three SS/EN pins support flexible sequencing: ganged for DDR, independent for multi-rail systems, or mixed for hybrid configurations |
| Robust protection architecture | PGOOD monitors all three outputs; COMP short detection shuts down entire IC within 1–2 oscillator cycles - prevents cascading failures |
Applications
| DDR Memory Power Supply | Multi-Rail Server CPU Core |
|---|---|
Use Scenario: Generating VDDQ (1.8V/2.5V) and VTT (0.9V/1.25V) for DDR2/DDR3 memory subsystems with tight tracking and low noise. IC Role / Device Role / Timing Role: ISL6534CV acts as primary triple-output controller: OUT1 regulates VDDQ, OUT2 tracks VDDQ/2 for VTT using REFIN, OUT3 supplies auxiliary bias. Use Value: Integrated 90° phase shift reduces input capacitor RMS current by ~30%, lowering thermal stress and enabling smaller bulk capacitance. |
Use Scenario: Powering heterogeneous processor cores requiring independent 1.2V, 1.8V, and 3.3V rails with strict sequencing and fault isolation. IC Role / Device Role / Timing Role: ISL6534CV serves as centralized regulator managing three isolated outputs via independent SS/EN pins and discrete feedback networks. Use Value: Independent soft-start allows staggered ramp-up (e.g., 1.2V → 1.8V → 3.3V), preventing inrush current overload on shared 12V input bus. |
| Industrial PLC I/O Module | Networking ASIC Bias Supply |
Use Scenario: Delivering stable 3.3V logic rail and 1.2V analog reference for sensor interface circuitry in harsh industrial environments. IC Role / Device Role / Timing Role: ISL6534CV's OUT3 linear regulator supplies low-noise 1.2V to ADC references; OUT1/OUT2 provide digital I/O and FPGA core power. Use Value: Linear OUT3 eliminates switching noise coupling into sensitive analog paths, improving ADC SNR by ≥12dB versus switched alternatives. |
Use Scenario: Providing tightly regulated 1.0V core, 1.8V I/O, and 2.5V PLL supply for high-speed networking ASICs with dynamic load transients. IC Role / Device Role / Timing Role: ISL6534CV functions as main power controller: OUT1 handles core rail with fast transient response; OUT2/OUT3 serve I/O and PLL domains. Use Value: Resistor-programmable 1MHz switching frequency enables smaller inductors (e.g., 0.47µH vs. 1.5µH at 300kHz), reducing board area by 40%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-output regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL6534CR | 32-lead 5×5 QFN package; dual PGND/PGND_2 and VCC12/VCC12_2 pins for improved noise isolation - no exposed pad thermal path difference | Preferred for high-density layouts requiring lower profile and better thermal dissipation than TSSOP | Select ISL6534CR when board space is constrained and thermal performance exceeds EPTSSOP limits; pinout differs (e.g., BOOT2/UGATE2 order swapped) |
| RT8205AZSP | Single-chip dual-buck + LDO (not linear); fixed 600kHz frequency; no REFOUT/VTT buffer or DDR phase-shift capability | Suitable for cost-sensitive consumer applications where DDR-specific features are unnecessary | Choose RT8205AZSP only for non-DDR, non-VTT applications requiring simpler BOM - lacks ISL6534CV's reference flexibility and fault coverage |
Compared with ISL6534CR and RT8205AZSP, the ISL6534CV offers unique DDR-specific functionality (90° phase shift, REFOUT-as-VTT-buffer, REFIN tracking), superior thermal management in TSSOP form factor, and full three-rail fault monitoring - making it irreplaceable in DDR memory power designs requiring precision and reliability.
Availability
ISL6534CV is available at Aetrix Electronics and suitable for DDR memory power supplies, server CPU core regulation, industrial PLC I/O modules, and networking ASIC bias applications requiring stable component supply across extended production lifecycles.
Supply support for ISL6534CV 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, formed through the acquisition of Intersil, is a global semiconductor leader specializing in analog, power management, and embedded processing solutions for industrial, automotive, and communications markets.
The ISL6534CV belongs to Renesas' high-performance power management product line, engineered specifically for DDR memory subsystems requiring precise multi-rail regulation, low-noise linear bias, and robust fault protection in mission-critical computing infrastructure.
FAQ
What is the function of the REFOUT pin on the ISL6534CV?
The REFOUT pin on the ISL6534CV provides a buffered copy of the REFIN voltage, commonly used as a VTT reference in DDR memory applications. When left open, it enables 90° phase shift between OUT1 and OUT2 in DDR mode; when tied to VCC, it selects 0° phase and disables buffering. Its ±10mV offset and 0.2–20mA sourcing capability ensure stable termination voltage generation for DDR2/DDR3 interfaces.
How does the ISL6534CV support DDR memory power requirements?
The ISL6534CV supports DDR memory power by enabling OUT1 to regulate VDDQ (e.g., 1.8V), using its output divided to REFIN to set OUT2 for VTT (e.g., 0.9V), and employing REFOUT as a buffered VTT reference. Its 90° phase-shift capability staggers switching edges to reduce input ripple, while independent soft-start ensures controlled ramp-up of both rails - meeting JEDEC DDR timing and noise specifications.
Can the ISL6534CV operate without a 5V supply?
Yes, the ISL6534CV can operate without an external 5V supply by enabling its internal shunt regulator: connect a 150Ω resistor from VCC to the 12V rail to generate 5.8V ±0.2V. This configuration maintains full functionality including PGOOD assertion, soft-start timing, and reference accuracy - verified across 0°C to 70°C operating range per datasheet Section "Electrical Specifications".
What is the maximum switching frequency achievable with the ISL6534CV?
The ISL6534CV achieves a maximum switching frequency of 1MHz by connecting an appropriate resistor from the FS_SYNC pin to ground, per the curve in Figure 12 of the FN9134 datasheet. At 1MHz, gate driver timing remains robust (UGATE rise/fall ≤27ns with 2nF load), enabling smaller magnetics and faster transient response - critical for high-density server and networking applications.
How does the PGOOD signal behave during fault conditions on the ISL6534CV?
The PGOOD signal on the ISL6534CV remains low-impedance (pulled low) if any COMP pin detects a short condition lasting longer than 1–2 internal oscillator cycles (~3.3µs at 300kHz), or if any SS/EN ramp fails to reach 3.3V. Upon fault detection, all three outputs shut down immediately - ensuring system-level safety and preventing damage to downstream FETs or loads connected to ISL6534CV outputs.
ISL6534CV Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- Topology:
- Step-Down (Buck) Synchronous (2), Linear (LDO) (1)
- Number of Outputs:
- 3
- Frequency - Switching:
- 300kHz ~ 1MHz
- Voltage/Current - Output 1:
- Controller
- Voltage/Current - Output 2:
- Controller
- Voltage/Current - Output 3:
- Controller
- w/LED Driver:
- No
- w/Supervisor:
- No
- w/Sequencer:
- Yes
- Voltage - Supply:
- 3.3V ~ 12V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TSSOP-EP
ISL6534CV FAQ
1.How can I place an order for ISL6534CV through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6534CV 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 ISL6534CV reliable?
The price and inventory of ISL6534CV are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6534CV is usually 5 days.
3.What payment methods are accepted for ISL6534CV?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6534CV transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6534CV?
ISL6534CV orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6534CV 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 ISL6534CV?
For technical support, including ISL6534CV datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6534CV requirements.
6.How does Aetrix verify that ISL6534CV is sourced from the original manufacturer or authorized distributors?
All ISL6534CV 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 ISL6534CV meets industry standards.
7.What is the process for return or replacement of ISL6534CV?
All ISL6534CV units undergo pre-shipment inspection (PSI). If there is an issue with ISL6534CV, 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 ISL6534CV part is unused and in its original packaging.
Return procedure for ISL6534CV:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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