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Analog Devices Inc. LTC3303CRUCM#TRPBF
- Part No.:
- LTC3303CRUCM#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-PowerWFQFN
- Datasheet:
-
LTC3303CRUCM#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 4A 12TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,776
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Product details
Overview
LTC3303CRUCM#TRPBF from Analog Devices is a monolithic synchronous step-down DC/DC converter delivering up to 4A output current, operating from 2.25V to 5.5V input, with factory-fixed 6MHz switching frequency and integrated 12mΩ NMOS / 34mΩ PMOS power switches. It regulates output voltages as low as 500mV with ±1% accuracy over temperature and supports forced continuous, pulse-skipping, or Burst Mode operation - ideal for space-constrained, battery-powered POL applications in optical networking and automotive infotainment systems.
For engineers reviewing the LTC3303CRUCM#TRPBF datasheet, LTC3303CRUCM#TRPBF pinout, LTC3303CRUCM#TRPBF application, or LTC3303CRUCM#TRPBF equivalent, key selection criteria include its 6MHz fixed-frequency operation, 27ns minimum on-time, side-wettable-flank FCQFN-12 package, low-noise Burst Mode (80µA IQ), and AEC-Q100 qualification for automotive-grade reliability.
Technical Context
The LTC3303CRUCM#TRPBF implements constant-frequency peak current mode control with internal compensation, enabling fast transient response using minimal external components. Its architecture integrates dual MOSFETs with matched gate drive timing and anti-shoot-through logic, supporting up to 100% duty cycle for low-dropout operation when VIN approaches VOUT.
It features three selectable operating modes via the MODE/SYNC pin: forced continuous (AGND), pulse-skipping (floating), or Burst Mode (AVIN). In Burst Mode, it achieves 80µA quiescent current while maintaining low output ripple; synchronization capability allows locking to external clocks within ±20% of nominal 6MHz frequency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 6MHz fixed - enables ultra-small external inductors (e.g., 100nH) and capacitors for high-density POL designs. |
| Output Current | 4A continuous - supports FPGA core rails, ASIC supplies, and multi-rail embedded processors without external boost stages. |
| Input Voltage Range | 2.25V to 5.5V - compatible with single-cell Li-ion, USB PD, and 3.3V/5V system rails. |
| Output Voltage Accuracy | ±1% over –40°C to +125°C - ensures stable regulation across automotive and industrial ambient conditions. |
| Quiescent Current (Burst) | 80µA - extends battery life in always-on subsystems such as telematics and sensor hubs. |
| Minimum On-Time | 27ns - supports high step-down ratios (e.g., 5V→0.5V at 6MHz) without pulse skipping or instability. |
| Thermal Protection | Junction shutdown at 165°C - prevents thermal runaway during overload or poor PCB heatsinking. |
Pinout & Package
The LTC3303CRUCM#TRPBF is housed in a thermally enhanced 12-pin Flip-Chip QFN (FCQFN) package measuring 2mm × 2mm × 0.75mm with exposed pad and side-wettable flanks for automated optical inspection (AOI) and reliable solder joint formation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 1) | Enable control input | Precision 400mV threshold with hysteresis - enables accurate power sequencing with external resistor dividers. |
| VIN (Pins 2,3) | Main power input | Dual high-current paths for top switch supply - requires low-ESR input capacitor placement directly at pins to minimize voltage spikes. |
| SW (Pins 4,5) | Switch node | High dv/dt node connecting internal MOSFETs to external inductor - must be routed with short, wide copper to reduce EMI and conduction loss. |
| PGND (Pins 6,7) | Power ground return | Dual low-impedance paths for bottom switch current - connects directly to input capacitor negative terminal for clean current loop closure. |
| MODE/SYNC (Pin 8) | Mode selection & clock sync | Configures operating mode (Burst/Continuous/Pulse-skip) or accepts external 6MHz ±20% clock - synchronizes multiple converters to avoid beat frequencies. |
| PGOOD (Pin 9) | Power good indicator | Open-drain output asserting high when VOUT is within –2%/+10% window - includes 120µs delay and OV/UV hysteresis for noise immunity. |
| VOUT (Pin 10) | Fixed-output voltage sense | Direct connection to regulated output - used only in fixed-voltage versions; not FB pin - bypassed to AGND with 1µF ceramic capacitor. |
| AGND (Pin 11) | Analog ground reference | Remote sense point for output voltage feedback - must connect to load-side output capacitor cathode to reject PCB IR drop errors. |
| AVIN (Pin 12) | Analog supply input | Decoupled via 10Ω + 1µF RC filter to AGND - isolates analog circuitry from noisy VIN transients and improves PSRR. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® Operation | Delivers 80µA IQ at light loads while maintaining <10mVpp output ripple - critical for always-on automotive modules. |
| Side-Wettable Flanks | Enables AOI-compatible solder joint inspection on 2mm × 2mm FCQFN - eliminates hidden voids and improves manufacturing yield in automotive SMT lines. |
| AEC-Q100 Qualified | Rated for –40°C to +125°C ambient operation with full automotive reliability testing - approved for use in ADAS camera modules and infotainment ECUs. |
| 100% Duty Cycle Capability | Supports dropout operation down to VIN = VOUT + IOUT × RDS(ON)PMOS - maintains regulation during brownout events in 12V-derived 5V/3.3V rails. |
| Integrated Overvoltage Protection | Shuts off top switch if FB exceeds 110% of target - prevents damage to downstream 1.2V FPGA cores during transient faults. |
Applications
| Automotive Camera Module Power | FPGA Core Supply (Low-Voltage) |
|---|---|
Use Scenario: Powers image sensor and ISP in rear-view or surround-view cameras requiring ultra-low noise and rapid load transient response. IC Role / Device Role / Timing Role: Primary 1.2V/1.8V POL regulator with Burst Mode enabled for standby current minimization and forced continuous mode during active imaging. Use Value: 6MHz switching avoids AM radio band interference; ±1% accuracy ensures consistent sensor biasing across temperature; side-wettable flanks meet automotive solder joint inspection standards. | Use Scenario: Supplies configurable logic core (VCCINT) of Xilinx Artix-7 or Intel Cyclone V FPGAs in edge AI gateways. IC Role / Device Role / Timing Role: High-current, low-noise buck converter delivering 4A at 0.85–1.2V with soft-start and PGOOD signaling for FPGA configuration sequencing. Use Value: 27ns min-on-time supports 5V-to-0.85V conversion at 6MHz; internal compensation reduces BOM count; PGOOD enables safe configuration lockout until rail stabilization. |
| Optical Transceiver (SFP+) Bias Rail | Industrial PLC I/O Module |
Use Scenario: Generates stable 3.3V bias for laser driver and TIA in 10Gbps SFP+ modules with strict EMI limits. IC Role / Device Role / Timing Role: Fixed-output 3.3V regulator operating in forced continuous mode to suppress switching noise near high-speed serial lanes. Use Value: 6MHz frequency places fundamental beyond 10GHz harmonics; low-RDS(ON) MOSFETs limit thermal rise in sealed modules; AVIN/AGND separation rejects digital noise coupling. | Use Scenario: Powers isolated microcontroller and signal conditioning circuitry in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Main 5V-to-3.3V POL converter with thermal shutdown and overvoltage protection for robust operation in harsh factory environments. Use Value: AEC-Q100 qualification ensures reliability under vibration and wide temperature swings; 100% duty cycle maintains output during 24V supply dips; PGND/VIN dual-pinning reduces ground bounce in noisy industrial grounds. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS6286418RTER | 3.6V max input, 1.8V fixed output, 4A, 4MHz - lacks AEC-Q100 rating and side-wettable flanks. | Suitable for consumer portable devices but not automotive or industrial environments requiring extended temperature or AOI compliance. | Select only for cost-sensitive non-automotive designs where 5.5V input headroom and AEC-Q100 are unnecessary. |
| MP2174GQZ-P | 2.5–5.5V input, 4A, 2MHz fixed, QFN-10 - no Burst Mode, higher 120µA IQ, no MODE/SYNC pin for mode selection. | Acceptable for general-purpose 3.3V/5V POL but cannot match LTC3303CRUCM#TRPBF's light-load efficiency or flexible mode control in battery-backed systems. | Choose when fixed 2MHz operation suffices and Burst Mode is not required; verify thermal performance at 4A in same PCB layout. |
Compared with TPS6286418RTER and MP2174GQZ-P, the LTC3303CRUCM#TRPBF uniquely combines 6MHz operation, AEC-Q100 qualification, side-wettable flanks, and selectable low-noise/low-IQ modes - making it the only option qualified for automotive camera and optical transceiver applications demanding both density and reliability.
Availability
LTC3303CRUCM#TRPBF is available at Aetrix Electronics and suitable for optical networking equipment, automotive ADAS camera modules, and industrial PLC I/O subsystems requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LTC3303CRUCM#TRPBF 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, communications, and automotive markets since 1965.
The LTC3303 product line delivers ultra-compact, high-efficiency synchronous buck regulators targeting space-constrained, noise-sensitive, and automotive-grade power delivery - with emphasis on low-profile FCQFN packaging, advanced mode control, and robust protection features.
FAQ
What is the switching frequency of the LTC3303CRUCM#TRPBF?
The LTC3303CRUCM#TRPBF operates at a factory-programmed fixed switching frequency of 6MHz. This enables use of sub-100nH inductors and compact ceramic output capacitors, reducing solution size significantly compared to lower-frequency alternatives. The frequency is not adjustable via external components but can be synchronized to an external clock within ±20% of 6MHz using the MODE/SYNC pin.
Does the LTC3303CRUCM#TRPBF support output voltage adjustment?
No, the LTC3303CRUCM#TRPBF is a fixed-output version - its output voltage is factory-programmed and not user-adjustable. Pin 10 functions as VOUT (not FB), and internal resistor dividers set the output. For adjustable operation, select the LTC3303xRUCM series (e.g., LTC3303ARUCM#TRPBF) which uses Pin 10 as FB and requires external resistors to set VOUT between 0.5V and VIN.
What package type does the LTC3303CRUCM#TRPBF use, and why does it matter?
The LTC3303CRUCM#TRPBF uses a 12-pin FCQFN package (2mm × 2mm × 0.75mm) with side-wettable flanks. This package enables automated optical inspection of solder joints - a mandatory requirement for automotive AEC-Q100 production. Its flip-chip construction provides superior thermal performance (θJCBOTTOM = 6.4°C/W) and low inductance, critical for high-frequency, high-current operation.
How does the MODE/SYNC pin configure operating modes on the LTC3303CRUCM#TRPBF?
The MODE/SYNC pin selects among three modes: tie to AVIN for Burst Mode (80µA IQ), to AGND for forced continuous (fixed 6MHz, lowest ripple), or leave floating for pulse-skipping (balanced efficiency/noise). When driven by an external 6MHz ±20% square wave, it synchronizes the internal oscillator - essential for noise-sensitive applications like high-speed SerDes or RF subsystems.
Is the LTC3303CRUCM#TRPBF qualified for automotive applications?
Yes, the LTC3303CRUCM#TRPBF is AEC-Q100 qualified for automotive applications (Grade 1: –40°C to +125°C ambient). It undergoes stress testing for temperature cycling, humidity, mechanical shock, and ESD per AEC-Q100 Rev H. This qualification - combined with side-wettable flanks and robust protection features - makes it suitable for use in camera modules, infotainment systems, and body control units.
LTC3303CRUCM#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-PowerWFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- 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:
- 4A
- Frequency - Switching:
- 6MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-TQFN (2x2)
LTC3303CRUCM#TRPBF FAQ
1.How can I place an order for LTC3303CRUCM#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3303CRUCM#TRPBF 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 LTC3303CRUCM#TRPBF reliable?
The price and inventory of LTC3303CRUCM#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3303CRUCM#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3303CRUCM#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3303CRUCM#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3303CRUCM#TRPBF?
LTC3303CRUCM#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3303CRUCM#TRPBF 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 LTC3303CRUCM#TRPBF?
For technical support, including LTC3303CRUCM#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3303CRUCM#TRPBF requirements.
6.How does Aetrix verify that LTC3303CRUCM#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3303CRUCM#TRPBF 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 LTC3303CRUCM#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3303CRUCM#TRPBF?
All LTC3303CRUCM#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3303CRUCM#TRPBF, 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 LTC3303CRUCM#TRPBF part is unused and in its original packaging.
Return procedure for LTC3303CRUCM#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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