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Renesas ISL6549CBZ-T
- Part No.:
- ISL6549CBZ-T
- Manufacturer:
- Renesas
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ISL6549CBZ-T.pdf
- Description:
- IC REG DL BUCK/LNR SYNC 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,864
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Product details
Overview
ISL6549CBZ-T from Renesas (formerly Intersil) is a dual-output power controller integrating a synchronous rectified buck PWM regulator and an N-channel linear regulator for 12V-input systems. It delivers ±1% static regulation over line, load, and temperature (0°C to 70°C), supports adjustable switching frequency from 150kHz to 1MHz, and regulates both outputs down to 0.8V - used in processor/memory supply rails requiring tight tracking and fast transient response.
For engineers reviewing the ISL6549CBZ-T datasheet, ISL6549CBZ-T pinout, ISL6549CBZ-T application, or ISL6549CBZ-T equivalent, key selection considerations include its single 12V bias requirement, dual independent feedback loops (FB/LDO_FB), integrated soft-start with synchronized ramping, undervoltage fault detection at 75% of nominal output, and compatibility with low-cost N-channel MOSFETs for both top-side and linear pass devices.
Technical Context
The ISL6549CBZ-T implements voltage-mode PWM control with a single feedback loop for the buck converter and a separate error amplifier for the linear regulator, both referenced to a precision 0.8V internal bandgap. Its oscillator frequency is set externally via FS_DIS resistor (e.g., 45.3kΩ yields 620kHz typical), and soft-start duration scales directly with switching frequency (e.g., 6.8ms at 620kHz).
Undervoltage protection activates after 25% of soft-start completion, monitoring FB and LDO_FB independently; a fault on either shuts down both regulators and initiates hiccup-mode retry. The IC integrates a 5V linear regulator (PVCC5) to drive UGATE and LGATE, with current-limited sourcing (100mA typical) and thermal-aware operation - no thermal shutdown, but current limiting prevents VCC12 collapse under overload.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Supply | +12V bias only - eliminates need for auxiliary 5V rail; VCC12 monitored for POR at 9.5V rising threshold. |
| Output Regulation Accuracy | ±1% over line/load/temperature - enables precise core and memory voltage setting without post-regulation trimming. |
| Switching Frequency Range | 150kHz to 1MHz - adjustable via external FS_DIS resistor; 620kHz typical with 45.3kΩ, enabling optimized size-efficiency tradeoff. |
| Reference Voltage | 0.800V ±1% (0.792–0.808V) - stable bandgap reference shared by both error amplifiers for consistent output scaling. |
| UV Fault Threshold | 75% of nominal output (e.g., 0.6V for 0.8V rail) - triggers immediate dual-output shutdown and controlled retry sequence. |
| Soft-Start Duration | 6.8ms at 620kHz - fixed 4096-clock-cycle ramp ensures controlled inrush current and avoids output overshoot during startup. |
| PVCC5 Output Capability | 100mA max - powers UGATE/LGATE drivers and VCC5 bias; current-limited to prevent thermal runaway under gate-drive overload. |
Pinout & Package
ISL6549CBZ-T is packaged in a 14-lead SOIC (Pb-free, RoHS-compliant), with exposed pad not present. Pin functions are electrically validated per FN9168 Rev 2.00 datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC12 | Main power input | 12V bias source; powers internal 5V regulator (PVCC5); monitored for POR at 9.5V rising threshold. |
| UGATE | High-side gate driver output | Drives N-channel upper MOSFET gate; sourced from PVCC5; max 17.5V swing relative to PHASE. |
| LGATE | Low-side gate driver output | Drives N-channel lower MOSFET gate; sourced from PVCC5; logic-level compatible (0–5.25V). |
| FB | PWM output feedback input | Inverting input of buck error amplifier; regulates VOUT1 to 0.8V reference; monitored for UV fault. |
| LDO_FB | Linear output feedback input | Inverting input of LDO error amplifier; regulates VOUT2 to 0.8V reference; independently monitored for UV fault. |
| LDO_DR | Linear pass transistor gate driver | Drives gate of external N-channel MOSFET for linear regulator; open-drain compatible with pull-up to VCC12. |
| FS_DIS | Frequency set / disable input | Resistor-to-GND sets oscillator frequency; low-impedance pull-down disables both regulators and initiates soft-start on release. |
| COMP | PWM compensation node | External compensation network (type-3 recommended) connects here and FB to stabilize voltage-mode loop. |
Key Features
| Feature | Design Value |
|---|---|
| Single 12V bias operation | Eliminates need for dedicated 5V supply - reduces BOM count and simplifies system power architecture. |
| Dual independent regulation | Separate FB and LDO_FB inputs enable independent voltage programming and fault monitoring for CPU core and memory rails. |
| Synchronized soft-start | Single internal ramp controls both outputs simultaneously - ensures monotonic startup and avoids cross-rail sequencing issues. |
| Bootstrap refresh circuit | Automatic LGATE pulse every 32 oscillator cycles recharges BOOT capacitor - maintains UGATE drive strength during high-duty-cycle operation. |
| Pb-free RoHS compliance | ISL6549CBZ-T uses matte tin plating and Pb-free molding compound - compatible with SnPb and lead-free reflow profiles per J-STD-020. |
Applications
| Processor Core Supply | Memory I/O Supply |
|---|---|
Use Scenario: Powering the core voltage rail of embedded microprocessors or ASICs requiring tightly regulated 0.8–1.5V at up to 5A. IC Role / Device Role / Timing Role: ISL6549CBZ-T acts as primary dual-output controller - buck stage delivers high-current core voltage; linear stage supplies low-noise I/O voltage. Use Value: ±1% regulation accuracy and fast transient response maintain CPU stability during burst-mode execution without external supervision. |
Use Scenario: Generating DDR SDRAM or LPDDR interface supply (e.g., VDDQ = 1.2V or 1.8V) in space-constrained embedded systems. IC Role / Device Role / Timing Role: ISL6549CBZ-T provides the linear-regulated memory rail while sharing soft-start and UV monitoring with the main processor rail. Use Value: Independent LDO_FB feedback enables precise memory voltage tuning without affecting core rail, reducing EMI-sensitive noise coupling. |
| ASIC Power Management | DSP Local Supply |
Use Scenario: Delivering multiple clean, sequenced voltages for mixed-signal ASICs with analog, digital, and I/O domains. IC Role / Device Role / Timing Role: ISL6549CBZ-T serves as compact dual-rail PMIC - buck output powers digital logic; linear output supplies analog/PLL circuits. Use Value: Shared 12V input and synchronized soft-start simplify PCB layout and eliminate need for external sequencing ICs. |
Use Scenario: Providing low-noise, fast-response supply for digital signal processors in real-time audio or motor control applications. IC Role / Device Role / Timing Role: ISL6549CBZ-T's linear regulator minimizes switching noise on DSP analog sections while buck stage handles high-current digital loads. Use Value: 75% UV threshold and hiccup-mode recovery prevent lockup during transient load faults common in DSP burst processing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output power controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL6542CRZ | Single-output synchronous buck controller (no linear regulator); 3A integrated FETs; 300kHz–1.5MHz frequency range. | Cannot replace ISL6549CBZ-T where linear-regulated second rail is required; suitable only if memory rail is generated separately. | Select ISL6542CRZ only when system uses discrete LDO or second controller for memory voltage - not a drop-in replacement. |
| RT8205AZSP | Dual-output buck controller (no linear stage); 2A/2A channels; 500kHz–1.2MHz; built-in OVP/UVP on both outputs. | Lacks linear regulator functionality - cannot generate low-noise, low-current memory rails without external LDO; different pinout and compensation scheme. | Choose RT8205AZSP for cost-sensitive dual-buck designs where both rails are switching; requires redesign for linear rail support. |
Compared with ISL6549CBZ-T, ISL6542CRZ omits the linear regulator entirely and integrates power FETs, trading flexibility for simplicity; RT8205AZSP offers higher integration for dual-buck but lacks the noise-isolated linear output essential for memory/PLL supplies.
Availability
ISL6549CBZ-T is available at Aetrix Electronics and suitable for processor core supplies, memory I/O rails, ASIC power management, and DSP local supplies requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for ISL6549CBZ-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 acquired Intersil in 2017 and maintains full technical support and manufacturing continuity for legacy Intersil power management ICs including the ISL6549 family.
The ISL6549CBZ-T belongs to Intersil's high-performance dual-output power controller product line, designed specifically for 12V-input computing and embedded systems needing tightly regulated, low-noise, and fast-transient CPU/memory voltage rails.
FAQ
What is the operating temperature range for the ISL6549CBZ-T?
The ISL6549CBZ-T is specified for commercial temperature operation from 0°C to +70°C. Its junction temperature must remain within 0°C to +125°C under normal operation. The device does not include thermal shutdown, so PCB thermal design and gate-drive loading must ensure safe junction temperatures - especially when PVCC5 supplies >100mA to external FETs.
Can the ISL6549CBZ-T operate without an external 5V supply?
Yes - the ISL6549CBZ-T generates its own internal 5V supply (PVCC5) from the 12V VCC12 input and uses it to power UGATE, LGATE, and VCC5 bias. An external 5V supply is optional and not required; if used, strict power sequencing (12V before 5V) must be observed to prevent latch-up per FN9168 Section 7.
How does undervoltage protection work on the ISL6549CBZ-T?
The ISL6549CBZ-T monitors FB and LDO_FB independently; if either drops below 75% of the 0.8V reference (i.e., 0.6V), both regulators shut down immediately. After a full soft-start cycle delay, it retries - entering hiccup mode until the fault clears. UV comparators activate only after 25% of soft-start completion to avoid false trips during ramp-up.
What package type is used for the ISL6549CBZ-T?
The ISL6549CBZ-T uses a 14-lead SOIC package (JEDEC MS-012, drawing M14.15) with Pb-free matte tin plating and RoHS-compliant materials. It has no exposed thermal pad - thermal performance relies on PCB copper area connected to GND pins, with θJA = 105°C/W per datasheet.
Does the ISL6549CBZ-T support adjustable output voltages?
Yes - both outputs are user-adjustable using external resistor dividers. The buck output (VOUT1) is set via FB and a divider referenced to the 0.8V internal reference; the linear output (VOUT2) is set similarly via LDO_FB. Outputs can be programmed down to 0.8V minimum; values below 0.8V are not supported.
ISL6549CBZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Topology:
- Step-Down (Buck) Synchronous (1), Linear (LDO) (1)
- Number of Outputs:
- 2
- Frequency - Switching:
- 150kHz ~ 1MHz
- Voltage/Current - Output 1:
- Controller
- Voltage/Current - Output 2:
- Controller
- Voltage/Current - Output 3:
- -
- w/LED Driver:
- No
- w/Supervisor:
- No
- w/Sequencer:
- No
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
ISL6549CBZ-T FAQ
1.How can I place an order for ISL6549CBZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6549CBZ-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 ISL6549CBZ-T reliable?
The price and inventory of ISL6549CBZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6549CBZ-T is usually 5 days.
3.What payment methods are accepted for ISL6549CBZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6549CBZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6549CBZ-T?
ISL6549CBZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6549CBZ-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 ISL6549CBZ-T?
For technical support, including ISL6549CBZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6549CBZ-T requirements.
6.How does Aetrix verify that ISL6549CBZ-T is sourced from the original manufacturer or authorized distributors?
All ISL6549CBZ-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 ISL6549CBZ-T meets industry standards.
7.What is the process for return or replacement of ISL6549CBZ-T?
All ISL6549CBZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL6549CBZ-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 ISL6549CBZ-T part is unused and in its original packaging.
Return procedure for ISL6549CBZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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