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Analog Devices Inc. LTC3306CACBZ-R7
- Part No.:
- LTC3306CACBZ-R7
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFBGA, WLCSP
- Datasheet:
-
LTC3306CACBZ-R7.pdf
- Description:
- IC REG BUCK PROG 1.75A 6WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:8,146
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Product details
Overview
LTC3306CACBZ-R7 from Analog Devices is a monolithic synchronous step-down DC/DC converter delivering up to 1.75A output current from 2.25V–5.5V input, operating at 2MHz fixed frequency with 22ns minimum on-time and ±1.0% VOUT accuracy. It supports forced continuous mode for low-noise operation and integrates PGOOD, thermal shutdown, and output short-circuit protection-used in FPGA core supplies requiring compact, high-efficiency regulation.
For engineers reviewing the LTC3306CACBZ-R7 datasheet, LTC3306CACBZ-R7 pinout, LTC3306CACBZ-R7 application, or LTC3306CACBZ-R7 equivalent, key selection criteria include its 6-pin 1.6mm × 1mm WLCSP package, 100% duty cycle capability for low dropout, precision 400mV enable threshold, and internal compensation eliminating external loop components.
Technical Context
The LTC3306CACBZ-R7 implements constant-frequency peak current mode control with a 2MHz oscillator and 22ns minimum on-time, enabling fast transient response in space-constrained designs. Its integrated 30mΩ NMOS and 100mΩ PMOS power switches support high efficiency across load range while maintaining stable regulation down to 0.5V output.
This variant operates exclusively in Forced Continuous Mode (FCM), ensuring consistent switching frequency and minimal output voltage ripple-critical for noise-sensitive digital loads like ASICs and microprocessors. It features internal soft-start, output overvoltage protection at 110% of nominal VOUT, and PGOOD with 100μs delay and hysteresis for reliable system sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.25V to 5.5V - supports single-cell Li-ion, USB, and intermediate bus rails without external LDO pre-regulation. |
| Output Current | 1.75A average - sufficient for powering FPGA I/O banks or ARM Cortex-A cores with dynamic load steps. |
| Switching Frequency | 2MHz - enables use of sub-1µH inductors and reduces solution size below 9mm² including passives. |
| Output Accuracy | ±1.0% - ensures tight regulation for voltage-sensitive logic domains and memory interfaces. |
| Enable Threshold | 400mV with 50mV hysteresis - allows precise power-up sequencing via resistor divider from upstream supply. |
| PGOOD Threshold | 98% of VOUT rising / 96.8% falling - provides clean, debounced power-good signaling for host processor reset control. |
| Thermal Shutdown | 160°C typical - protects device during sustained overload or poor PCB thermal design without latch-off. |
Pinout & Package
The LTC3306CACBZ-R7 is housed in a 6-pin, 1.6mm × 1mm, 0.5mm pitch Wafer-Level Chip-Scale Package (WLCSP) with flip-chip construction and θJA = 60°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGOOD (A1) | Open-drain power-good indicator | Pulled low during UVLO, OV, thermal fault, or shutdown; requires external pull-up for system monitoring. |
| GND (A2) | Power ground and remote sense return | Serves as return path for bottom switch and reference point for FB/VOUT sensing-must be connected near input/output capacitors. |
| EN (B1) | Enable control with precision threshold | Active-high input; 400mV rising threshold enables accurate sequencing without external supervisor IC. |
| SW (B2) | Switch node | Connects directly to inductor; carries high di/dt square wave-requires short, wide PCB trace to minimize EMI and losses. |
| VOUT (C1) | Regulated output voltage pin | Fixed-output version pin; connects to output capacitor and load-no external feedback required. |
| VIN (C2) | Main power input | Supplies top switch and internal circuitry; requires local 10µF ceramic bypass capacitor to GND. |
Key Features
| Feature | Design Value |
|---|---|
| Forced Continuous Mode (FCM) | Eliminates low-load frequency variation and output ripple spikes-ideal for noise-sensitive analog or RF subsystems. |
| 100% Duty Cycle Operation | Enables ultra-low dropout performance when VIN approaches VOUT-supports brownout resilience in battery-powered systems. |
| Internal Compensation | Removes need for external compensation network-reduces BOM count and layout sensitivity while maintaining stability. |
| 22ns Minimum On-Time | Permits high step-down ratios (e.g., 5V→0.5V) at 2MHz without pulse-skipping-preserves regulation under wide VIN/VOUT combinations. |
| Output Short-Circuit Protection | Valley-current limiting prevents runaway inductor current during hard shorts-enables safe auto-recovery after fault removal. |
Applications
| FPGA Core Supply | ASIC Power Delivery |
|---|---|
Use Scenario: Regulating 1.2V core voltage for Xilinx Artix-7 FPGA under dynamic logic switching loads up to 1.75A. IC Role / Device Role / Timing Role: Primary synchronous buck regulator providing tightly regulated, low-noise DC power with fast transient response. Use Value: 2MHz switching and internal compensation ensure stable operation across process/voltage/temperature corners without tuning. | Use Scenario: Powering ARM-based SoC clusters in industrial gateways where thermal headroom is limited and EMI must be minimized. IC Role / Device Role / Timing Role: High-efficiency POL converter delivering 1.8V at 1.75A with forced continuous mode to suppress spectral noise. Use Value: 1.6mm × 1mm WLCSP footprint saves board area in dense multilayer layouts while maintaining >90% efficiency at 1A. |
| Microprocessor I/O Rail | Lithium-Ion Powered Sensor Node |
Use Scenario: Generating 3.3V I/O supply for NXP i.MX RT series MCUs in automotive telematics modules. IC Role / Device Role / Timing Role: Secondary buck regulator supporting high-current digital interfaces (SPI, UART, CAN) with precise enable sequencing. Use Value: 400mV EN threshold and PGOOD output enable deterministic power-up order relative to main 5V rail. | Use Scenario: Step-down from 4.2V Li-ion battery to 1.8V for ultra-low-power IoT sensor MCU during active measurement bursts. IC Role / Device Role / Timing Role: Compact, thermally robust DC/DC converter sustaining 1.75A peak loads while operating down to 2.25V input. Use Value: 100% duty cycle and 22ns min-on-time extend usable battery voltage range and maintain regulation through discharge curve. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS6286518RRLR | 3.6V max VIN, 2.5MHz switching, 1.2A rated output - lower current capacity and narrower input range. | Best suited for lower-power MCU cores where 1.2A suffices and 2.5MHz enables smaller inductors. | Select if board space is more critical than current headroom and input voltage stays ≤3.6V. |
| MP2143GJ-Z | 2.5V–6V VIN, 1.5A output, 1.5MHz switching, no PGOOD - lacks power-good signaling and has lower current rating. | Appropriate for cost-sensitive industrial controls where sequencing is handled externally and 1.5A meets requirement. | Choose when PGOOD is unnecessary and thermal derating at 1.5A is acceptable for target ambient conditions. |
Compared with TPS6286518RRLR and MP2143GJ-Z, the LTC3306CACBZ-R7 delivers higher output current (1.75A vs. 1.2A/1.5A), wider input range (2.25V–5.5V), and integrated PGOOD-making it uniquely suitable for FPGA/ASIC core rails demanding both performance headroom and system-level reliability signaling.
Availability
LTC3306CACBZ-R7 is available at Aetrix Electronics and suitable for FPGA core supplies, ASIC power delivery, and microprocessor I/O rails requiring stable component supply with guaranteed long-term availability and full traceability.
Supply support for LTC3306CACBZ-R7 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
Analog Devices is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision instrumentation, communications, and industrial markets.
The LTC3306 family was designed specifically for space-constrained, high-efficiency point-of-load applications in portable and embedded systems-emphasizing ultra-small packaging, fast transient response, and robust protection features.
FAQ
What is the operating temperature range for the LTC3306CACBZ-R7?
The LTC3306CACBZ-R7 is rated for an operating junction temperature range of –40°C to +125°C, with guaranteed specifications across this full range per design characterization and statistical process control. Its thermal shutdown activates at 160°C typical to prevent damage during overload conditions.
Does the LTC3306CACBZ-R7 require external compensation components?
No, the LTC3306CACBZ-R7 features internal compensation optimized for stability with standard ceramic output capacitors and recommended inductors. This eliminates external RC networks, reduces BOM count, and simplifies layout-verified across all operating conditions in the datasheet.
How does the PGOOD function behave during startup and fault conditions for the LTC3306CACBZ-R7?
The LTC3306CACBZ-R7 asserts PGOOD high-impedance only when VOUT reaches ≥98% of target and remains stable; it pulls low during startup until soft-start completes, and also during EN low, VIN UVLO, VOUT overvoltage (>110%), or thermal shutdown-providing unambiguous system power status.
Can the LTC3306CACBZ-R7 operate with input voltage as low as 2.25V while delivering full 1.75A output?
Yes, the LTC3306CACBZ-R7 is fully specified to deliver 1.75A at VIN = 2.25V, though RDS(ON) of internal MOSFETs increases slightly at low VIN. Thermal design must account for higher conduction loss-junction temperature must stay ≤125°C under worst-case ambient and airflow conditions.
What is the purpose of the 22ns minimum on-time specification in the LTC3306CACBZ-R7?
Its 22ns minimum on-time enables high step-down ratios (e.g., 5V→0.5V) at 2MHz without pulse-skipping or mode transitions-ensuring continuous regulation, predictable EMI spectrum, and stable loop behavior even when VIN/VOUT ratio exceeds 10:1.
LTC3306CACBZ-R7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 6-WFBGA, WLCSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Programmable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.25V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.5V
- Voltage - Output (Max):
- 3.65V
- Current - Output:
- 1.75A
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-WLCSP (1.64x1.03)
LTC3306CACBZ-R7 FAQ
1.How can I place an order for LTC3306CACBZ-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3306CACBZ-R7 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 LTC3306CACBZ-R7 reliable?
The price and inventory of LTC3306CACBZ-R7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3306CACBZ-R7 is usually 5 days.
3.What payment methods are accepted for LTC3306CACBZ-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3306CACBZ-R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3306CACBZ-R7?
LTC3306CACBZ-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3306CACBZ-R7 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 LTC3306CACBZ-R7?
For technical support, including LTC3306CACBZ-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3306CACBZ-R7 requirements.
6.How does Aetrix verify that LTC3306CACBZ-R7 is sourced from the original manufacturer or authorized distributors?
All LTC3306CACBZ-R7 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 LTC3306CACBZ-R7 meets industry standards.
7.What is the process for return or replacement of LTC3306CACBZ-R7?
All LTC3306CACBZ-R7 units undergo pre-shipment inspection (PSI). If there is an issue with LTC3306CACBZ-R7, 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 LTC3306CACBZ-R7 part is unused and in its original packaging.
Return procedure for LTC3306CACBZ-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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