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Renesas ISL6549IBZ-T
- Part No.:
- ISL6549IBZ-T
- Manufacturer:
- Renesas
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ISL6549IBZ-T.pdf
- Description:
- IC REG DL BUCK/LNR SYNC 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,587
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Product details
Overview
ISL6549IBZ-T 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 over line, load, and temperature, 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 ISL6549IBZ-T datasheet, ISL6549IBZ-T pinout, ISL6549IBZ-T application, or ISL6549IBZ-T equivalent, key selection considerations include its -40°C to +85°C industrial temperature range, 14-lead SOIC (Pb-free) package, dual independent undervoltage fault monitoring (75% VREF threshold), integrated soft-start with 6.8ms ramp at 620kHz, and compatibility with low-cost external N-channel MOSFETs for both topologies.
Technical Context
The ISL6549IBZ-T implements voltage-mode PWM control with a single feedback loop for the buck stage and a dedicated error amplifier for the linear stage, sharing a common 0.8V reference and synchronized soft-start ramp. Its oscillator frequency is resistor-programmable via FS_DIS, and it features independent UV detection on FB and LDO_FB pins that triggers simultaneous shutdown of both regulators.
Internally, it generates PVCC5 (~5.25V) from VCC12 to bias UGATE and LGATE drivers, while VCC5 powers analog/linear circuitry; both supplies are monitored by POR circuitry requiring VCC12 ≥9.5V and VCC5 ≥4.2V before enabling soft-start. The bootstrap circuit includes automatic refresh logic to maintain UGATE drive during extended high-side conduction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Input | +12V nominal input (±10%), no auxiliary 5V supply required |
| Output Regulation Accuracy | ±1% over line, load, and temperature for both PWM and linear outputs |
| Switching Frequency Range | 150kHz–1MHz, set externally via FS_DIS resistor |
| Reference Voltage | 0.800V ±1.2% (0.788V–0.812V) for both error amplifiers |
| Undervoltage Threshold | 75% of VREF (0.6V nominal) on FB and LDO_FB, triggering full shutdown |
| Soft-Start Duration | 6.8ms typical at 620kHz oscillator frequency |
| Operating Temperature | -40°C to +85°C ambient (industrial grade) |
| Package | 14-lead SOIC, Pb-free (RoHS compliant) |
Pinout & Package
ISL6549IBZ-T is housed in a 14-lead SOIC package (JEDEC MS-012, pkg drawing M14.15), with exposed pad not present. Pin functions are validated per FN9168 Rev 2.00 datasheet, Page 6.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC12 | Main power input | Supplies internal 5V regulator (PVCC5); monitored for POR (rising threshold = 9.5V) |
| VCC5 | Analog/logic bias supply | Powered internally from PVCC5 or optionally from external 5V ±5%; also POR-monitored |
| GND | Signal ground reference | Common return for all analog and digital circuitry; must connect directly to PCB ground plane |
| PVCC5 | Internal 5V gate driver supply | Provides ~5.25V for UGATE/LGATE; not for external use; current-limited to 100mA |
| PGND | Power ground return | Dedicated return path for LGATE driver; separate from signal GND for noise isolation |
| UGATE | High-side gate driver output | Drives N-MOSFET gate with 0.7Ω sink / 0.8Ω source impedance; bootstrapped from PHASE |
| BOOT | Bootstrap capacitor node | Connects to external capacitor (PHASE–BOOT); enables high-side drive above VCC12 |
| PHASE | Switch node | Connects to source of upper MOSFET; forms switching node for buck topology |
| LGATE | Low-side gate driver output | Drives N-MOSFET gate from PVCC5; 0.4Ω sink / 0.8Ω source impedance |
| FB | PWM output feedback | Inverting input of PWM error amp; regulates VOUT1 to 0.8V reference via resistor divider |
| COMP | PWM compensation node | External compensation point for voltage-mode loop; connects to FB via type-3 network |
| FS_DIS | Frequency select / disable | Resistor sets oscillator frequency; low-impedance pull-down disables both regulators |
| LDO_DR | Linear pass transistor gate drive | Drives gate of external N-MOSFET for linear regulator; supports up to 2mA source current |
| LDO_FB | Linear output feedback | Inverting input of linear error amp; regulates VOUT2 to same 0.8V reference |
Key Features
| Feature | Design Value |
|---|---|
| Single 12V bias operation | Eliminates need for separate 5V supply - simplifies system power architecture and reduces BOM count |
| Dual independent regulation | Enables simultaneous, tightly tracked control of CPU core (PWM) and memory I/O (linear) rails |
| Integrated soft-start with shared ramp | Prevents inrush current in both outputs using one controlled 6.8ms voltage ramp |
| Simultaneous UV fault shutdown | Guarantees coordinated protection: drop below 0.6V on either FB or LDO_FB halts both converters |
| Bootstrap refresh logic | Automatically pulses LGATE once per 32 oscillator cycles to recharge BOOT capacitor during sustained high-side conduction |
| Pb-free RoHS compliance | Meets IPC/JEDEC J-STD-020 reflow requirements for SnPb and Pb-free soldering processes |
Applications
| Processor Core Supply | Memory I/O Supply |
|---|---|
Use Scenario: Regulating voltage for high-performance microprocessors or ASICs requiring dynamic voltage scaling and fast load-step response. IC Role / Device Role / Timing Role: Primary PWM controller generating VOUT1 (e.g., 1.2V core rail) with synchronous rectification and ±1% accuracy. Use Value: Delivers fast transient recovery (<10µs) via high-bandwidth error amplifier (20MHz GBWP) and supports adjustable switching frequency for EMI optimization. | Use Scenario: Providing stable, low-noise bias for DDR memory termination or I/O buffers where ripple sensitivity exceeds PWM capability. IC Role / Device Role / Timing Role: Linear regulator controller driving external N-MOSFET to generate VOUT2 (e.g., 1.8V or 2.5V memory rail). Use Value: Achieves <10mVpp ripple without output inductor; leverages same 0.8V reference and soft-start as PWM stage for rail tracking. |
| ASIC Power Management | DSP System Rail Generation |
Use Scenario: Powering multi-rail ASICs in telecom or industrial equipment where space-constrained board layout demands minimal external components. IC Role / Device Role / Timing Role: Dual-output controller managing both high-current digital core and low-current analog/peripheral supplies from single 12V input. Use Value: Reduces component count by eliminating discrete 5V bias supply and separate linear controller ICs; supports 150kHz–1MHz frequency tuning for layout flexibility. | Use Scenario: Supplying clean, regulated voltages to DSP subsystems in audio processing or motor control applications with strict thermal constraints. IC Role / Device Role / Timing Role: Generates matched VDD and AVDD rails using shared reference and soft-start, ensuring deterministic power-up sequencing. Use Value: Enables reliable startup under partial pre-charge conditions (e.g., hot-swap scenarios) via adaptive soft-start that ramps from existing output voltage level. |
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 |
|---|---|---|---|
| ISL6549CAZ-T | Same architecture and specs, but 16-lead QSOP package and 0°C to +70°C commercial temp range | Suitable for cost-sensitive, non-industrial environments; larger footprint and lower thermal performance (θJA = 110°C/W) | Select ISL6549CAZ-T only if commercial temperature range suffices and QSOP layout is preferred |
| RT8205AZSP | Single-chip dual buck controller (no linear stage); 0.6V reference; supports 3A/2A outputs; 0°C to +70°C | Replaces ISL6549IBZ-T only when both rails require switching regulation - lacks linear output capability | Choose RT8205AZSP when higher efficiency across both rails is critical and linear rail noise sensitivity is not a concern |
Compared with ISL6549CAZ-T and RT8205AZSP, the ISL6549IBZ-T uniquely combines industrial temperature rating (-40°C to +85°C), integrated linear regulator control, and 14-lead SOIC compactness - making it optimal for embedded systems requiring robust, low-noise memory rail generation alongside high-efficiency core regulation.
Availability
ISL6549IBZ-T is available at Aetrix Electronics and suitable for processor core supplies, memory I/O rails, and ASIC power management requiring stable component supply across industrial temperature ranges and long-term production continuity.
Supply support for ISL6549IBZ-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 technical and manufacturing continuity for legacy Intersil power management ICs including the ISL6549 series.
The ISL6549 product line was designed specifically for high-density, dual-rail DC/DC conversion in computing and communications infrastructure - emphasizing integration of PWM and linear control, simplified 12V-only biasing, and robust fault management.
FAQ
What is the operating temperature range of the ISL6549IBZ-T?
The ISL6549IBZ-T is rated for industrial operation from -40°C to +85°C ambient temperature. This is confirmed in the Ordering Information table on page 1 of FN9168 Rev 2.00, where ISL6549IBZ is explicitly listed with "-40 to 85" under TEMP. RANGE (°C). The junction temperature limit remains +125°C, consistent with the recommended operating conditions section.
Does the ISL6549IBZ-T require an external 5V supply?
No, the ISL6549IBZ-T does not require an external 5V supply. It derives PVCC5 (~5.25V) internally from the 12V VCC12 input to power gate drivers, and uses a resistor (typically ~10Ω) between PVCC5 and VCC5 to bias the analog/logic circuitry. An external 5V supply is optional and only permitted with strict sequencing precautions per datasheet page 7.
How does undervoltage protection work on the ISL6549IBZ-T?
The ISL6549IBZ-T monitors FB and LDO_FB independently with comparators set to 75% of the 0.8V internal reference (i.e., 0.6V). If either pin falls below this threshold during operation, both the PWM and linear regulators shut down immediately. Recovery occurs after a full soft-start cycle, entering hiccup mode until the fault clears - as detailed in Figures 4 and 5 of FN9168 Rev 2.00.
What package type is used for the ISL6549IBZ-T?
The ISL6549IBZ-T uses a 14-lead SOIC package with Pb-free finish (RoHS compliant), per the Ordering Information table on page 1 of FN9168 Rev 2.00. Its package drawing is designated M14.15, and it is distinct from the QFN and QSOP variants offered in the same family.
Can the ISL6549IBZ-T regulate both outputs below 1.0V?
Yes, the ISL6549IBZ-T can regulate both outputs down to 0.8V. The datasheet states "PWM and linear output voltage range: down to 0.8V" (page 1), and the reference voltage is specified as 0.800V ±1.2% (page 4). Output voltages below 0.8V are not supported, as the feedback architecture requires the resistor divider to scale the output to match the internal reference.
ISL6549IBZ-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:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
ISL6549IBZ-T FAQ
1.How can I place an order for ISL6549IBZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6549IBZ-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 ISL6549IBZ-T reliable?
The price and inventory of ISL6549IBZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6549IBZ-T is usually 5 days.
3.What payment methods are accepted for ISL6549IBZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6549IBZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6549IBZ-T?
ISL6549IBZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6549IBZ-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 ISL6549IBZ-T?
For technical support, including ISL6549IBZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6549IBZ-T requirements.
6.How does Aetrix verify that ISL6549IBZ-T is sourced from the original manufacturer or authorized distributors?
All ISL6549IBZ-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 ISL6549IBZ-T meets industry standards.
7.What is the process for return or replacement of ISL6549IBZ-T?
All ISL6549IBZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL6549IBZ-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 ISL6549IBZ-T part is unused and in its original packaging.
Return procedure for ISL6549IBZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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