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Renesas ISL6534CRZ-T
- Part No.:
- ISL6534CRZ-T
- Manufacturer:
- Renesas
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
ISL6534CRZ-T.pdf
- Description:
- IC REG TRPL BUCK/LNR SYNC 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,181
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Product details
Overview
ISL6534CRZ-T from Renesas Electronics (formerly Intersil) is a triple-output voltage regulator IC integrating two synchronous-rectified buck PWM controllers (OUT1, OUT2) and one linear controller (OUT3), designed for DDR memory power delivery and multi-rail embedded systems. It supports 0.6V–6V output on buck channels, 0.6V–3.3V on linear channel, 300kHz–1MHz adjustable switching frequency, and independent soft-start/enable per rail. Used in DDRAM controller boards requiring precise VDDQ/VTT tracking.
For engineers reviewing the ISL6534CRZ-T datasheet, ISL6534CRZ-T pinout, ISL6534CRZ-T application, or ISL6534CRZ-T equivalent, this page delivers verified technical context, validated pin functions, confirmed DDR/independent mode operation, real-world soft-start coordination behavior, and accurate alternative part comparisons - all grounded in the FN9134 Rev 2.00 datasheet and Renesas packaging documentation.
Technical Context
The ISL6534CRZ-T implements dual voltage-mode PWM controllers with integrated 12V gate drivers (UGATE/LGATE pairs), each supporting independent feedback via FB1/FB2 and compensation via COMP1/COMP2. OUT1 uses an internal 0.6V reference; OUT2 accepts external reference input at REFIN and provides buffered VTTREF at REFOUT. The linear controller (OUT3) drives an external N-channel MOSFET via DRIVE3 with 0.6V internal reference and 9V drive capability.
It features three SS/EN pins (SS1/EN1, SS2/EN2, SS3/EN3) with 30µA current-source soft-start and 1.0V enable threshold, PGOOD open-drain status output tied to completion of all three ramps and short-circuit detection, and FS/SYNC pin supporting resistor-tuned (300kHz–1MHz) or externally synchronized clocking. Phase relationships (0°/90°/180°) between buck channels are selected via REFOUT pin configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range (VCC12) | 12V ±10% (supports 10.8V–13.2V input for gate drivers and high-side bias) |
| Buck Output Range (OUT1/OUT2) | 0.6V–6.0V (set by resistor divider to FB1/FB2; OUT1 uses internal 0.6V ref) |
| Linear Output Range (OUT3) | 0.6V–3.3V (set by FB3 divider; DRIVE3 drives external N-MOSFET with 9V max gate swing) |
| Switching Frequency | 300kHz default (FS_SYNC to GND); adjustable to 1MHz via resistor; sync-capable to external clock |
| Soft-Start Current | 30µA per SS/EN pin (capacitor-to-ground sets ramp time; 1.0V threshold disables controller) |
| PGOOD Logic | Open-drain output active-low during startup/fault; high-Z when all rails complete soft-start and no COMP short detected |
| Package | 32-pin 5×5mm QFN with exposed thermal pad (JEDEC MO-220 compliant; θJA = 32°C/W) |
Pinout & Package
ISL6534CRZ-T is housed in a thermally enhanced 32-lead 5×5mm QFN package (JEDEC MO-220, pkg drawing L32.5x5) with exposed GND pad for PCB-level thermal conduction. Pin numbering follows top-view layout with GND pad centered on bottom side.
| 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 respective regulator; ganging enables coordinated startup |
| FB1, FB2, FB3 | Feedback input | Resistor divider from output connects here; compared to 0.6V (OUT1/OUT3) or REFIN (OUT2) for regulation |
| COMP1, COMP2 | Error amplifier output | External Type-III compensation network connects here to stabilize buck loops |
| UGATE1/2, LGATE1/2 | Gate driver outputs | Drive external high-side (bootstrap-referenced) and low-side (VCC12-referenced) MOSFETs; 2Ω source/sink resistance |
| BOOT1, BOOT2 | Bootstrap supply input | Accepts ~12V bootstrap voltage for high-side gate drive; max 36V rating relative to GND |
| DRIVE3 | Linear regulator gate driver | Drives gate of external N-MOSFET for OUT3; 9V max output, 0.4mA source/sink capability |
| REFIN, REFOUT | Reference input/output | REFIN sets OUT2 reference (e.g., VDDQ/2 for DDR); REFOUT buffers REFIN or selects phase (0°/90°/180°) |
| PGOOD | Power-good indicator | Open-drain signal pulled low until all three regulators complete soft-start and pass short-circuit monitoring |
Key Features
| Feature | Design Value |
|---|---|
| Dual synchronous buck + linear topology | Enables single-chip DDR memory power (VDDQ + VTT) plus auxiliary rail (e.g., VREF) without external controllers |
| DDR mode with shared soft-start | SS2/EN2 tied to VCC enables coordinated ramp of OUT1 and OUT2 using single capacitor; eliminates sequencing complexity |
| Configurable phase relationship | REFOUT pin selection (VCC/open) sets 0°, 90°, or 180° phase shift between buck channels to reduce input ripple RMS and EMI |
| Shunt-regulated VCC option | Internal shunt generates ~5.8V from 12V supply (via 150Ω resistor), eliminating need for separate 5V rail in space-constrained designs |
| Thermally optimized QFN | 32-pin 5×5mm QFN with exposed pad achieves θJC = 4°C/W, enabling >15W dissipation in compact layouts |
Applications
| DDR Memory Power Supply | Multi-Rail Embedded System |
|---|---|
Use Scenario: Powering DDR SDRAM modules requiring tightly tracked VDDQ (1.8V/2.5V) and VTT termination (½ VDDQ) with fast transient response. IC Role / Device Role / Timing Role: ISL6534CRZ-T acts as primary triple-output controller: OUT1 regulates VDDQ, OUT2 sinks/sources VTT referenced to REFIN=VDDQ/2, OUT3 supplies buffered VREF. Use Value: Eliminates discrete op-amps and external references; 90° phase shift reduces input capacitor RMS current by ~30% versus in-phase operation. |
Use Scenario: Industrial control board needing independent 3.3V logic rail, 1.2V core voltage, and 2.5V analog reference-all with programmable startup timing. IC Role / Device Role / Timing Role: ISL6534CRZ-T serves as centralized power management IC: OUT1 (3.3V), OUT2 (1.2V), OUT3 (2.5V), each with dedicated SS/EN pin for staggered power-up. Use Value: Independent soft-start capacitors allow precise sequencing (e.g., I/O before core); PGOOD confirms full system readiness before firmware initialization. |
| Server Memory Module | Test Equipment Power Subsystem |
Use Scenario: High-density RDIMM/LRDIMM modules where board area and thermal density constrain discrete regulator count. IC Role / Device Role / Timing Role: ISL6534CRZ-T integrates VDDQ, VTT, and VPP (or VREF) regulation into one QFN; REFOUT used as VTT buffer for downstream receivers. Use Value: 5×5mm footprint replaces ≥3 discrete buck ICs; exposed thermal pad sustains 1.5A VTT sink current at <70°C ambient without heatsink. |
Use Scenario: Automated test equipment requiring stable, low-noise auxiliary rails for ADC references and sensor biasing under varying load conditions. IC Role / Device Role / Timing Role: ISL6534CRZ-T provides ultra-stable linear output (OUT3) for precision analog circuits, while buck channels power digital subsystems. Use Value: 0.6V reference accuracy ±0.7% (0.6027–0.6173V) ensures <±10mV error on 2.5V rail; DRIVE3's 9V gate drive supports low-RDS(on) MOSFETs for <5mV load regulation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-output regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL6522CRZ-T | Dual-buck-only (no linear controller); lacks DRIVE3, FB3, SS3/EN3; 24-pin TSSOP package | Cannot replace ISL6534CRZ-T in designs requiring VREF/VPP linear output or DDR VTT sourcing/sinking | Select only if third rail is generated externally or omitted; verify PCB layout accommodates larger TSSOP footprint. |
| RTQ2132B-QT | Single-chip triple buck (no linear channel); supports 300kHz–2.2MHz switching; integrated MOSFETs (no external FETs required) | Eliminates external power FETs but cannot replicate ISL6534CRZ-T's linear VTT sourcing/sinking capability or shunt-regulated VCC | Prefer for cost-sensitive, low-current applications where external FETs are undesirable; not suitable for high-sink VTT loads (>1.2A). |
Compared with ISL6534CRZ-T, ISL6522CRZ-T omits the linear regulator entirely-requiring external circuitry for VREF/VPP-while RTQ2132B-QT replaces external FETs with integrated ones but sacrifices VTT bidirectional capability and shunt-regulator flexibility, making ISL6534CRZ-T uniquely suited for DDR memory power with mixed buck/linear requirements.
Availability
ISL6534CRZ-T is available at Aetrix Electronics and suitable for DDR memory modules, server DIMMs, industrial embedded controllers, and test equipment power subsystems requiring stable component supply across long production lifecycles.
Supply support for ISL6534CRZ-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 and maintains full product support, datasheets, and application notes for legacy Intersil power management ICs including the ISL6534 series.
The ISL6534 product line was designed specifically for DDR memory power delivery and multi-rail embedded systems requiring coordinated soft-start, phase-adjustable switching, and integrated linear regulation-addressing the complexity of VDDQ/VTT/VREF generation in space-constrained applications.
FAQ
What is the function of the SS2/EN2 pin on the ISL6534CRZ-T?
The SS2/EN2 pin on the ISL6534CRZ-T serves dual roles: as a soft-start timing input (30µA current source charging external capacitor) and as an enable control (<1.0V disables OUT2). When tied to VCC, it activates DDR mode-causing OUT2 to share the SS1/EN1 ramp and reference-enabling coordinated startup with OUT1. In Independent mode, it operates separately with its own capacitor. This pin directly determines system-level sequencing behavior in the ISL6534CRZ-T.
Can the ISL6534CRZ-T generate VTT without an external op-amp?
Yes, the ISL6534CRZ-T can generate VTT without an external op-amp. OUT2 operates in current-sinking and sourcing mode using REFIN as reference (e.g., VDDQ/2), and REFOUT provides a buffered copy usable as VTT. The datasheet Figure 2 confirms this DDR mode operation, where OUT2 regulates VTT directly via feedback at FB2 while REFIN is derived from a resistor divider on VOUT1. No external amplifier is needed in the ISL6534CRZ-T implementation.
What is the maximum output current supported by the linear regulator (OUT3) in the ISL6534CRZ-T?
The ISL6534CRZ-T linear regulator (OUT3) does not specify a fixed maximum current in the datasheet; its capability depends on the external N-channel MOSFET, input voltage headroom, and thermal design. DRIVE3 provides up to 9V gate drive with 0.4mA source/sink current, enabling use of low-RDS(on) FETs. With proper heatsinking and VIN–VOUT margin, typical designs achieve 1–2A continuous output. Thermal limits (θJA = 32°C/W) and SOA of the external FET define the practical ceiling-not the ISL6534CRZ-T itself.
How does the ISL6534CRZ-T handle power-good signaling across all three outputs?
The ISL6534CRZ-T uses a single open-drain PGOOD pin that remains low until all three regulators (OUT1, OUT2, OUT3) complete their individual soft-start ramps *and* no short-circuit fault is detected on either buck channel's COMP pins. The internal filter requires 1–2 clock cycles (~3.3µs at 300kHz) to confirm stability. Only then does PGOOD go high-impedance, allowing external pull-up to assert "power good." This unified status signal simplifies system power sequencing in the ISL6534CRZ-T.
Does the ISL6534CRZ-T support synchronization to an external clock source?
Yes, the ISL6534CRZ-T supports external clock synchronization via the FS/SYNC pin. Applying a clean digital clock signal (300kHz–1MHz range, ≤12V peak with 10kΩ series resistor) locks the internal oscillator to the external frequency, aligning switching edges to avoid beat frequencies. This capability is explicitly documented in the "Switcher Clocking" feature list and Electrical Specifications table of the ISL6534CRZ-T datasheet, enabling noise-sensitive multi-regulator systems to operate coherently.
ISL6534CRZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 32-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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:
- 32-QFN (5x5)
ISL6534CRZ-T FAQ
1.How can I place an order for ISL6534CRZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6534CRZ-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 ISL6534CRZ-T reliable?
The price and inventory of ISL6534CRZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6534CRZ-T is usually 5 days.
3.What payment methods are accepted for ISL6534CRZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6534CRZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6534CRZ-T?
ISL6534CRZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6534CRZ-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 ISL6534CRZ-T?
For technical support, including ISL6534CRZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6534CRZ-T requirements.
6.How does Aetrix verify that ISL6534CRZ-T is sourced from the original manufacturer or authorized distributors?
All ISL6534CRZ-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 ISL6534CRZ-T meets industry standards.
7.What is the process for return or replacement of ISL6534CRZ-T?
All ISL6534CRZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL6534CRZ-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 ISL6534CRZ-T part is unused and in its original packaging.
Return procedure for ISL6534CRZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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