My Inquiry
My Account
Renesas ISL6549CAZA-T
- Part No.:
- ISL6549CAZA-T
- Manufacturer:
- Renesas
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
ISL6549CAZA-T.pdf
- Description:
- IC REG DL BUCK/LNR SYNC 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,727
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ISL6549CAZA-T from Renesas Electronics (formerly Intersil) is a dual-output power controller integrating a synchronous rectified buck PWM regulator and a linear regulator for 12V-input systems. It delivers ±1% static regulation over line, load, and temperature for both outputs, supports adjustable switching frequency from 150kHz to 1MHz, and drives low-cost N-channel MOSFETs in both topologies - used in processor/memory supply rails requiring tight voltage tracking and fast transient response.
For engineers reviewing the ISL6549CAZA-T datasheet, ISL6549CAZA-T pinout, ISL6549CAZA-T application, or ISL6549CAZA-T equivalent, key selection considerations include its dual-regulator architecture with shared soft-start ramp, undervoltage fault monitoring on both FB and LDO_FB pins, Pb-free QSOP-16 packaging, and compatibility with external N-MOSFETs for cost-sensitive high-performance DC/DC designs.
Technical Context
The ISL6549CAZA-T 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 set by an external resistor on FS_DIS, and soft-start duration scales directly with that frequency (e.g., 6.8ms at 620kHz).
Undervoltage protection activates when either FB or LDO_FB falls below 75% of VREF (0.6V), triggering simultaneous shutdown and retry mode. The IC integrates an internal 5V linear regulator (PVCC5) for gate driver bias, with current-limited sourcing (100mA typical) and thermal-aware operation - no thermal shutdown, but current limiting prevents rail collapse under overload.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Supply | +12V ±10% bias only - no auxiliary 5V supply required |
| Output Regulation Accuracy | ±1% over line, load, and 0°C to +70°C ambient - enables precise core/memory rail compliance |
| Switching Frequency Range | 150kHz to 1MHz - adjustable via external FS_DIS resistor for EMI/noise optimization |
| Reference Voltage | 0.800V ±1% - sets minimum output voltage for both PWM and linear regulators |
| Soft-Start Duration | 6.8ms at 620kHz - fixed 4096-clock-cycle ramp ensures controlled inrush current |
| UV Fault Threshold | 75% of VREF (0.6V) on FB and LDO_FB - triggers immediate dual-output shutdown and hiccup-mode retry |
| Package | 16-lead QSOP, Pb-free (RoHS compliant) - compatible with standard surface-mount reflow profiles |
Pinout & Package
ISL6549CAZA-T is housed in a 16-lead QSOP package (package drawing M16.15A), with exposed pad not present (unlike QFN variant). Pin functions are validated per FN9168 Rev 2.00 datasheet, Page 2 (QSOP top view) and Page 6 (functional descriptions).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB | Inverting input of PWM error amplifier | Connects to resistor divider from VOUT1; regulates to 0.8V reference; monitored for UV fault |
| COMP | Output of PWM error amplifier | Drives external Type-3 compensation network between COMP and FB for loop stability |
| LDO_DR | Gate drive output for external N-MOSFET pass device | Sinks/source up to 2mA; controls linear regulator output voltage (VOUT2) via external FET |
| LDO_FB | Inverting input of linear regulator error amplifier | Connects to resistor divider from VOUT2; regulated to same 0.8V reference; UV-monitored |
| UGATE / LGATE | High-side and low-side gate drivers | Drive external N-MOSFETs; UGATE bootstrapped from PHASE–BOOT capacitor; LGATE referenced to PVCC5 |
| VCC12 / VCC5 / PVCC5 | Power supply inputs and internal 5V regulator output | VCC12 powers IC and internal 5V regulator; PVCC5 supplies gate drivers; VCC5 biases analog/logic circuits |
| FS_DIS | Oscillator frequency set and enable/disable input | Resistor-to-GND sets fSW; low-impedance pull-down disables both regulators and initiates new soft-start |
| GND / AGND / DGND | Signal ground references | All tied to PCB ground plane; AGND/DGND separation supports noise-sensitive analog/digital partitioning |
Key Features
| Feature | Design Value |
|---|---|
| Single 12V bias operation | Eliminates need for separate 5V supply - reduces BOM count and simplifies system power architecture |
| Dual independent regulation | Simultaneous ±1% accuracy on both buck (VOUT1) and linear (VOUT2) outputs - supports split-rail processor/memory supplies |
| Shared soft-start ramp | Forces coordinated startup of both outputs - prevents sequencing conflicts and avoids cross-regulation during power-up |
| Integrated PVCC5 5V regulator | Supplies gate drivers and VCC5 bias with 100mA capability - eliminates external LDO and improves layout compactness |
| UV fault detection with hiccup mode | Shuts down both regulators upon FB or LDO_FB < 0.6V and retries automatically - protects downstream loads without manual reset |
Applications
| Processor Core Supply | Memory I/O Supply |
|---|---|
|
Use Scenario: Powering CPU/GPU core voltage rails in embedded or desktop computing platforms where tight regulation and fast load-step response are critical. IC Role / Device Role / Timing Role: Dual-regulator controller managing primary buck converter (VOUT1) for core logic and linear regulator (VOUT2) for memory interface voltage. Use Value: ±1% regulation tolerance and shared soft-start ensure stable core voltage during boot and dynamic DVFS transitions without rail interaction. |
Use Scenario: Delivering clean, low-noise 1.2V–1.8V supply to DDR SDRAM or LPDDR interfaces in networking or industrial controllers. IC Role / Device Role / Timing Role: Linear regulator stage (VOUT2) provides ripple-free, fast-transient-capable voltage derived from same 12V input as main buck stage. Use Value: Eliminates need for separate low-noise LDO; leverages ISL6549CAZA-T's integrated LDO_DR/LDO_FB loop for sub-1% accuracy without added components. |
| ASIC Power Management | DSP System Supply |
|
Use Scenario: Generating multiple tightly tracked supply voltages for mixed-signal ASICs with analog, digital, and I/O domains. IC Role / Device Role / Timing Role: Buck stage powers digital core; linear stage powers analog/PLL sections - both referenced to common 0.8V bandgap. Use Value: Common reference and matched thermal drift enable <10mV inter-rail tracking across temperature - critical for ADC/DAC performance. |
Use Scenario: Supporting real-time DSP subsystems requiring deterministic power-up timing and fault containment. IC Role / Device Role / Timing Role: Dual-output controller with synchronized soft-start and UV lockout ensures predictable DSP initialization and graceful fault recovery. Use Value: Hiccup-mode retry on UV fault prevents system hang; 6.8ms soft-start aligns with DSP boot ROM execution window. |
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-T | Same die, 4×4mm QFN-16 package with exposed thermal pad - lower θJA (52°C/W vs 110°C/W) | Better thermal performance for higher-current (>5A) buck stages; requires different PCB land pattern | Select ISL6549CRZ-T when board space allows QFN and thermal dissipation exceeds QSOP limits. |
| RT8205AZQW | Single-chip dual buck controller (no linear stage); 30V max input; 0.6V reference; supports 300kHz–2MHz fSW | Targets higher-power, fully switched solutions - lacks linear regulator for low-noise/low-current rails | Choose RT8205AZQW only if both rails require switching regulation and 12V input headroom permits higher VIN range. |
Compared with ISL6549CAZA-T, ISL6549CRZ-T offers superior thermal management in compact layouts but demands QFN assembly capability, while RT8205AZQW replaces the linear stage with a second buck channel - trading low-noise simplicity for higher efficiency at the cost of added complexity and filtering requirements.
Availability
ISL6549CAZA-T is available at Aetrix Electronics and suitable for processor core supplies, memory I/O rails, ASIC power domains, and DSP system supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL6549CAZA-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 and manufacturing continuity for legacy Intersil power management products.
The ISL6549CAZA-T belongs to Intersil's high-precision dual-output controller product line, designed specifically for 12V-input systems needing tightly regulated, sequenced, and fault-protected core/memory voltage rails in computing and communications infrastructure.
FAQ
What is the operating temperature range for the ISL6549CAZA-T?
The ISL6549CAZA-T is specified for commercial-grade operation from 0°C to +70°C ambient temperature. This range is confirmed in the Ordering Information table on page 1 of FN9168 Rev 2.00, where ISL6549CAZA is explicitly listed with "0 to 70°C" under TEMP. RANGE. Junction temperature must remain ≤+125°C under all operating conditions.
Does the ISL6549CAZA-T require an external 5V supply?
No, the ISL6549CAZA-T does not require an external 5V supply. It generates its own internal 5V bias (PVCC5) from the 12V input via an integrated linear regulator, which powers the gate drivers and VCC5 logic/analog circuitry. An external 5V supply is optional and discouraged unless strict sequencing constraints demand it.
How is the switching frequency set on the ISL6549CAZA-T?
The switching frequency of the ISL6549CAZA-T is set by an external resistor connected between the FS_DIS pin and GND. Per Figure 6 and electrical specs on page 4 of FN9168 Rev 2.00, a 45.3kΩ resistor yields 620kHz typical. Frequency ranges from 150kHz to 1MHz depending on resistor value, with no need for external clock source.
Can the ISL6549CAZA-T regulate both outputs below 1.0V?
Yes, the ISL6549CAZA-T can regulate both outputs down to 0.8V - the exact value of its internal reference voltage. Page 1 of the datasheet states "PWM and linear output voltage range: down to 0.8V", and Equation 1 (page 9) confirms VOUT1 = 0.8V × (1 + R4/R1), meaning 0.8V is achievable by omitting R4 and connecting VOUT1 directly to FB via R1.
What happens if one output fails undervoltage while the other remains nominal?
If either FB or LDO_FB drops below 75% of VREF (0.6V), the ISL6549CAZA-T immediately shuts down both the PWM and linear regulators and enters hiccup-mode retry. As described on page 8, this means both outputs are disabled, an internal soft-start delay occurs, then a new soft-start ramp begins - repeating until the fault clears.
ISL6549CAZA-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 16-SSOP (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:
- 16-QSOP
ISL6549CAZA-T FAQ
1.How can I place an order for ISL6549CAZA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6549CAZA-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 ISL6549CAZA-T reliable?
The price and inventory of ISL6549CAZA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6549CAZA-T is usually 5 days.
3.What payment methods are accepted for ISL6549CAZA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6549CAZA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6549CAZA-T?
ISL6549CAZA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6549CAZA-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 ISL6549CAZA-T?
For technical support, including ISL6549CAZA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6549CAZA-T requirements.
6.How does Aetrix verify that ISL6549CAZA-T is sourced from the original manufacturer or authorized distributors?
All ISL6549CAZA-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 ISL6549CAZA-T meets industry standards.
7.What is the process for return or replacement of ISL6549CAZA-T?
All ISL6549CAZA-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL6549CAZA-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 ISL6549CAZA-T part is unused and in its original packaging.
Return procedure for ISL6549CAZA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISL6549CAZA-T Tags
-
TPS6521905RHBR
Texas Instruments
-
MIC3385YHL-TR
Microchip Technology
-
A4402ELPTR-T
Allegro MicroSystems
-
LM26480SQ-AA/NOPB
Texas Instruments
-
A4402KLPTR-T
Allegro MicroSystems
-
BD71847AMWV-E2
ROHM Semiconductor
-
ADP5040ACPZ-1-R7
Analog Devices Inc.
-
LT3048IDC#TRPBF
Analog Devices Inc.
-
ADP5037ACPZ-R7
Analog Devices Inc.
-
XRP7714ILB-F
MaxLinear, Inc.
-
LTC3260EDE#TRPBF
Analog Devices Inc.
-
LTC3260EMSE#PBF
Analog Devices Inc.
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
