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Renesas ISL6549CBZ
- Part No.:
- ISL6549CBZ
- Manufacturer:
- Renesas
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ISL6549CBZ.pdf
- Description:
- IC REG DL BUCK/LNR SYNC 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,832
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Product details
Overview
ISL6549CBZ from Renesas Electronics (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 across 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 voltage tracking and fast transient response.
For engineers reviewing the ISL6549CBZ datasheet, ISL6549CBZ pinout, ISL6549CBZ application, or ISL6549CBZ equivalent, key selection considerations include its single 12V bias requirement, dual independent feedback loops (FB and LDO_FB), integrated soft-start with synchronized ramping, undervoltage fault monitoring at 75% of nominal output, and Pb-free 14-lead SOIC packaging with thermal pad compatibility.
Technical Context
The ISL6549CBZ implements voltage-mode PWM control with a single feedback loop for the buck stage and a separate error amplifier for the linear stage, both referenced to a precision 0.8V internal bandgap. Its oscillator frequency is resistor-programmable via FS_DIS, and it features automatic boot capacitor refresh during extended high-side FET conduction.
Power sequencing is managed through dual POR monitoring on VCC12 (rising threshold 9.5V) and VCC5 (rising threshold 4.2V); both must exceed thresholds before soft-start initiates. Undervoltage protection activates at 75% of reference (0.6V) on FB and LDO_FB after 25% of soft-start completion, triggering simultaneous shutdown and hiccup-mode retry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Synchronous rectified buck PWM + N-channel linear regulator - enables efficient high-current core rail and low-noise memory rail from single 12V input. |
| Output Regulation Accuracy | ±1% over line, load, and temperature - ensures stable voltage delivery for sensitive digital loads without external calibration. |
| Switching Frequency Range | 150kHz to 1MHz (resistor-programmable) - allows optimization of efficiency vs. size: higher frequencies reduce inductor/capacitor footprint; lower frequencies improve light-load efficiency. |
| Minimum Output Voltage | 0.8V for both PWM and linear outputs - matches standard I/O and core voltage requirements for contemporary processors and memory. |
| Supply Inputs | Single 12V bias (VCC12); internal 5V regulator (PVCC5) powers gate drivers - eliminates need for auxiliary 5V supply, simplifying system power architecture. |
| Undervoltage Threshold | 75% of reference (0.6V at FB/LDO_FB) - provides robust fault detection against brownout, open feedback, or failed pass FET before system instability occurs. |
| Soft-Start Duration | 6.8ms at 620kHz - controls inrush current by ramping both outputs synchronously, preventing input rail collapse and MOSFET stress during power-up. |
Pinout & Package
ISL6549CBZ is housed in a Pb-free 14-lead SOIC package (M14.15) with exposed thermal pad connection to GND. Pin functions are validated per FN9168 Rev 2.00 datasheet Figure 2 (SOIC top view).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC12 | Main power supply input | Accepts +12V ±10%; powers internal 5V regulator and monitors POR - must exceed 9.5V to initiate soft-start. |
| VCC5 | Analog/logic bias supply | Internally regulated 5V source; monitored for POR at 4.2V rising threshold - ties to PVCC5 via 10Ω resistor in recommended configuration. |
| PGND | Power ground return | Low-impedance return path for LGATE driver - requires direct PCB plane connection to minimize noise coupling into feedback paths. |
| UGATE | High-side N-MOSFET gate driver | Drives upper FET gate with 17.5V max swing (VPHASE + 5.5V bootstrap); RDS(ON) = 0.8Ω ensures fast turn-on for high-frequency operation. |
| LGATE | Low-side N-MOSFET gate driver | Drives lower FET gate from PVCC5; RDS(ON) = 0.4Ω sink capability enables rapid discharge and prevents shoot-through. |
| FB | PWM output voltage feedback | Inverting input of buck error amplifier; regulated to 0.8V reference - connects to resistor divider from VOUT1 for programmable output setting. |
| LDO_FB | Linear output voltage feedback | Inverting input of linear error amplifier; also regulated to 0.8V - connects to resistor divider from VOUT2 for independent voltage programming. |
| FS_DIS | Oscillator set/disabled control | Resistor-to-GND sets frequency; low-impedance pull-down disables both regulators and triggers soft-start restart - critical for sequencing and fault recovery. |
Key Features
| Feature | Design Value |
|---|---|
| Single 12V bias operation | Eliminates need for external 5V supply - reduces BOM count and simplifies layout while maintaining full functionality for both regulators. |
| Dual independent feedback loops | Separate FB and LDO_FB pins enable precise, uncorrelated regulation of CPU core (PWM) and memory (linear) rails - avoids cross-regulation errors in multi-rail systems. |
| Integrated soft-start with synchronized ramp | 6.8ms controlled ramp for both outputs prevents inrush current peaks and ensures orderly power-up even with pre-charged outputs. |
| Boot capacitor auto-refresh | Detects >32 oscillator cycles of UGATE high-time and pulses LGATE once to recharge BOOT capacitor - maintains gate drive strength during 100% duty cycle conditions. |
| Undervoltage fault latching & hiccup mode | Simultaneous shutdown of both regulators upon FB or LDO_FB UV event, followed by timed retry cycles - protects downstream circuitry while enabling autonomous recovery. |
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 15A. IC Role / Device Role / Timing Role: Dual-output controller providing synchronous buck regulation for core logic and linear regulation for auxiliary I/O domains. Use Value: ±1% regulation accuracy and fast transient response maintain CPU stability under dynamic load changes, while shared soft-start ensures coordinated rail sequencing. | Use Scenario: Delivering clean, low-noise 1.2–1.8V supply to DDR SDRAM or LPDDR memory interfaces in portable or industrial controllers. IC Role / Device Role / Timing Role: Linear regulator stage (LDO_DR + LDO_FB) supplies memory rail with minimal ripple, decoupled from switching noise of the buck stage. Use Value: Independent feedback loop and absence of switching artifacts prevent data corruption and timing violations in high-speed memory buses. |
| ASIC Power Management | DSP System Rail Generation |
Use Scenario: Generating multiple precision rails for mixed-signal ASICs with analog front-ends and digital processing blocks. IC Role / Device Role / Timing Role: Dual-regulator IC manages primary digital supply (buck) and secondary analog/PLL supply (linear) from single 12V source. Use Value: Tight 0.8V reference tolerance and matched thermal drift between regulators ensure consistent voltage margins across process corners and temperature ranges. | Use Scenario: Providing core and I/O voltages for fixed-point or floating-point DSPs in real-time signal processing equipment. IC Role / Device Role / Timing Role: Buck stage powers DSP core at 1.0–1.2V; linear stage supplies I/O buffers at 3.3V or 1.8V using external pass FET. Use Value: Resistor-programmable frequency allows optimization for DSP's burst-mode current profile, while hiccup-mode UV protection prevents lockup during transient faults. |
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 |
|---|---|---|---|
| ISL6549CRZ | Same die, 16-lead 4×4 QFN package with lower θJA (52°C/W) and exposed thermal pad - no SOIC pinout compatibility. | Preferred for space-constrained, thermally demanding designs where PCB area and thermal performance outweigh SOIC assembly familiarity. | Select ISL6549CRZ when board-level thermal resistance must be minimized and QFN reflow capability exists. |
| ISL6549CAZ | Same die, 16-lead QSOP package with higher θJA (110°C/W); identical electrical specs and pin function mapping except pin 16 (VCC12) added. | Suitable for legacy SOIC-reflow processes adapted to QSOP; offers same 0–70°C range but less thermal headroom than QFN. | Choose ISL6549CAZ only if QSOP footprint is mandated by existing assembly lines and thermal margin permits. |
Compared with ISL6549CBZ, ISL6549CRZ offers superior thermal dissipation in compact layouts, while ISL6549CAZ retains similar manufacturability to SOIC but with reduced thermal efficiency - neither is pin-compatible with ISL6549CBZ due to differing lead counts and physical footprints.
Availability
ISL6549CBZ is available at Aetrix Electronics and suitable for processor core supplies, memory I/O rails, and ASIC power management systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL6549CBZ 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 continues to support its high-performance analog and power management portfolio.
The ISL6549CBZ belongs to Intersil's legacy dual-output power controller product line, designed specifically for single-rail 12V systems needing tightly coupled CPU/memory regulation with minimal external components.
FAQ
What is the operating temperature range for the ISL6549CBZ?
The ISL6549CBZ is rated for commercial operation from 0°C to +70°C ambient temperature. This range is specified in the Ordering Information table of FN9168 Rev 2.00 and applies to all electrical parameters unless otherwise noted. The junction temperature must remain within 0°C to +125°C under normal operation, and thermal design must account for θJA = 105°C/W in the 14-lead SOIC package.
Does the ISL6549CBZ require an external 5V supply?
No, the ISL6549CBZ does not require an external 5V supply. It generates its own internal 5V bias (PVCC5) from the 12V VCC12 input to power gate drivers and analog circuitry. The VCC5 pin is internally regulated and should be decoupled to ground; using an external 5V supply is possible but not recommended due to sequencing risks and potential latch-up.
How is the switching frequency set on the ISL6549CBZ?
The switching frequency of the ISL6549CBZ is set by an external resistor connected from the FS_DIS pin to ground. According to Figure 6 in FN9168 Rev 2.00, a 45.3kΩ resistor yields 620kHz (typical). The supported range is 150kHz to 1MHz, and frequency selection directly impacts soft-start duration, inductor size, and efficiency trade-offs.
Can the ISL6549CBZ regulate both outputs below 1.0V?
Yes, the ISL6549CBZ can regulate both outputs down to 0.8V - the value of its internal reference voltage. The PWM output (VOUT1) and linear output (VOUT2) are each set via external resistor dividers referenced to this 0.8V node. Outputs below 0.8V are not supported, as the feedback amplifiers are designed for regulation at or above this threshold.
What happens during an undervoltage fault on either output of the ISL6549CBZ?
When either FB or LDO_FB drops below 75% of the 0.8V reference (i.e., 0.6V), the ISL6549CBZ immediately shuts down both the PWM and linear regulators. After a delay equal to one soft-start cycle, it initiates a new soft-start ramp. If the fault persists, this hiccup-mode retry repeats indefinitely - a behavior confirmed in Figures 4 and 5 of FN9168 Rev 2.00.
ISL6549CBZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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 FAQ
1.How can I place an order for ISL6549CBZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6549CBZ 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 reliable?
The price and inventory of ISL6549CBZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6549CBZ is usually 5 days.
3.What payment methods are accepted for ISL6549CBZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6549CBZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6549CBZ?
ISL6549CBZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6549CBZ 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?
For technical support, including ISL6549CBZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6549CBZ requirements.
6.How does Aetrix verify that ISL6549CBZ is sourced from the original manufacturer or authorized distributors?
All ISL6549CBZ 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 meets industry standards.
7.What is the process for return or replacement of ISL6549CBZ?
All ISL6549CBZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL6549CBZ, 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 part is unused and in its original packaging.
Return procedure for ISL6549CBZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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