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Analog Devices Inc. LTC3303ARUCM#TRPBF
- Part No.:
- LTC3303ARUCM#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-PowerWFQFN
- Datasheet:
-
LTC3303ARUCM#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 4A 12TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,768
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Product details
Overview
LTC3303ARUCM#TRPBF from Analog Devices is a monolithic synchronous step-down DC/DC converter delivering up to 4A continuous output current with 2MHz fixed switching frequency, 2.25V–5.5V input range, and factory-programmed 1.0V output. It employs peak current mode control, supports forced continuous, pulse-skipping, and low-ripple Burst Mode® operation, and integrates 12mΩ NMOS and 34mΩ PMOS power switches for high efficiency in space-constrained POL applications.
For engineers reviewing the LTC3303ARUCM#TRPBF datasheet, LTC3303ARUCM#TRPBF pinout, LTC3303ARUCM#TRPBF application, or LTC3303ARUCM#TRPBF equivalent, key selection criteria include its 2mm × 2mm FCQFN package with side-wettable flanks, ±1% output voltage accuracy over temperature, 27ns minimum on-time, AEC-Q100 qualification for automotive use, and support for clock synchronization up to ±20% frequency deviation.
Technical Context
The LTC3303ARUCM#TRPBF implements constant-frequency peak current mode control with internal compensation, enabling fast transient response using minimal external components. Its architecture includes dual power switches (NMOS top, PMOS bottom), integrated soft-start, output overvoltage protection, and thermal shutdown - all operating within a –40°C to +125°C ambient temperature range.
Mode selection is controlled via the MODE/SYNC pin: floating enables pulse-skipping, AGND forces continuous conduction, and AVIN activates low-ripple Burst Mode® with 80µA quiescent current. The device supports up to 100% duty cycle for low-dropout operation and tolerates inductor saturation during overload conditions without latch-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.25V to 5.5V - supports single-cell Li-ion, USB PD, and intermediate bus rails without external LDO pre-regulation. |
| Output Voltage | Fixed 1.0V ±1% - factory-programmed, eliminating external feedback resistors and reducing BOM count and layout sensitivity. |
| Max Output Current | 4A continuous - sufficient for FPGA core, ASIC I/O, or microprocessor VDD rails with margin for transient peaks. |
| Switching Frequency | 2MHz nominal - enables use of sub-1µH inductors and compact ceramic output capacitors for high-density PCB layouts. |
| Quiescent Current | 80µA in Burst Mode® - extends battery runtime in always-on IoT sensors and portable medical devices. |
| Min On-Time | 27ns - allows stable 1.0V output from 2.25V input (44% duty cycle), supporting wide VIN-to-VOUT ratios without instability. |
| Thermal Protection | Junction shutdown at ~165°C - prevents permanent damage during sustained overload or poor heatsinking in sealed enclosures. |
Pinout & Package
The LTC3303ARUCM#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 robust solder joint reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 1) | Enable control input | Precision 400mV threshold with hysteresis enables accurate power sequencing; ties directly to VIN for always-on operation. |
| VIN (Pins 2,3) | Main power input | Dual pins reduce IR drop and thermal resistance; must be shorted and bypassed locally to PGND with low-ESR capacitor. |
| SW (Pins 4,5) | Switch node | High-current path connecting internal MOSFETs to external inductor; requires low-inductance routing to minimize EMI. |
| PGND (Pins 6,7) | Power ground return | Dual ground pins handle peak switch currents; connect input capacitor negative terminals here for lowest loop inductance. |
| MODE/SYNC (Pin 8) | Operating mode selector / clock sync | Configures Burst Mode®, pulse-skipping, or forced continuous; accepts external 2MHz clock for system-level timing alignment. |
| PGOOD (Pin 9) | Open-drain power-good indicator | Signals valid regulation (±2%/+10% window) with 120µs delay; pulled low during UVLO, thermal fault, or EN deassertion. |
| VOUT (Pin 10) | Fixed-output voltage sense | Direct connection to regulated 1.0V output; not high-impedance - used only on fixed-output variants like LTC3303ARUCM#TRPBF. |
| AGND (Pin 11) | Analog ground reference | Remote sense point for output voltage feedback; must connect to load-side capacitor cathode to reject PCB trace IR drop. |
| AVIN (Pin 12) | Analog supply input | Decoupled via 10Ω resistor + 1µF capacitor to AGND; isolates analog circuitry from noisy power-switching transients. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® Operation | 80µA IQ at light loads enables >90% efficiency down to 1mA output current - critical for battery longevity in standby modes. |
| Side-Wettable Flank FCQFN | Enables automated AOI of solder joints on 2mm × 2mm footprint - improves manufacturing yield and field-reliability in automotive and industrial assemblies. |
| AEC-Q100 Qualified | Rated for automotive Grade 1 (–40°C to +125°C ambient) with full PPAP documentation - suitable for ADAS camera modules and infotainment power rails. |
| 100% Duty Cycle Capability | Supports dropout operation when VIN approaches VOUT - maintains regulation during brownout events in distributed power systems. |
| Internal Compensation | Eliminates external compensation network - reduces design cycle time and eliminates tuning iterations for standard 330nH–470nH inductors. |
Applications
| FPGA Core Supply | Automotive Camera Module |
|---|---|
Use Scenario: Powering Xilinx Artix-7 or Intel Cyclone V FPGA core logic requiring tightly regulated 1.0V at up to 3.5A with fast load-step response. IC Role / Device Role / Timing Role: Primary synchronous buck regulator providing POL voltage with <50mV undershoot during 2A/µs load transients. Use Value: 27ns min-on-time and peak current mode control deliver <5µs recovery from 0.5A→3.5A steps - avoids logic corruption during configuration bursts. | Use Scenario: Supplying image sensor and ISP in rear-view or surround-view cameras operating in under-hood environments. IC Role / Device Role / Timing Role: AEC-Q100-compliant 1.0V POL converter with thermal shutdown and PGOOD monitoring for functional safety compliance. Use Value: Side-wettable flanks ensure solder joint integrity across thermal cycling; 125°C ambient rating sustains operation near engine compartments. |
| Industrial PLC I/O Module | 5G Small Cell Radio |
Use Scenario: Generating 1.0V for ARM Cortex-M7 microcontroller and isolated CAN transceivers in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: High-efficiency local regulator converting 3.3V backplane rail to MCU core voltage with low EMI emissions. Use Value: Forced continuous mode (via MODE/SYNC = AGND) delivers <10mVpp ripple - prevents noise coupling into analog sensor front-ends. | Use Scenario: Powering RF transceiver ASICs in outdoor 5G small cells where size, efficiency, and thermal performance are constrained. IC Role / Device Role / Timing Role: Compact 2mm × 2mm POL solution replacing discrete controllers and external MOSFETs to meet SWaP-C targets. Use Value: 48.9°C/W θJA enables 4A operation at 60°C ambient without heatsink - reduces bill-of-materials and board area vs. larger converters. |
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 |
|---|---|---|---|
| TPS6286418RTER | 3.3V–5.5V input, 1.8V fixed output, 4A, 2.25MHz, 1.5mm × 2.0mm WSON | Higher fixed output voltage; smaller package but no AEC-Q100 rating or Burst Mode® | Select for space-constrained non-automotive apps needing 1.8V; not drop-in for 1.0V or automotive use. |
| MP2145GJ-Z | 2.5V–5.5V input, adjustable 0.6V–5.5V, 4A, 2MHz, 2mm × 2mm QFN, no AEC-Q100 | Adjustable output requires external resistors; lacks PGOOD, soft-start, and automotive qualification | Choose for cost-sensitive industrial designs where 1.0V is set externally and functional safety is not required. |
Compared with TPS6286418RTER and MP2145GJ-Z, the LTC3303ARUCM#TRPBF uniquely combines factory-programmed 1.0V output, AEC-Q100 qualification, side-wettable flanks, and 80µA Burst Mode® IQ - making it the only option qualified for automotive camera and ADAS core power without design revalidation.
Availability
LTC3303ARUCM#TRPBF is available at Aetrix Electronics and suitable for FPGA core supplies, automotive camera modules, industrial PLC I/O, 5G small cell radios, and distributed POL systems requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LTC3303ARUCM#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 industrial markets.
The LTC3303 belongs to Analog Devices' Power by Linear™ family of monolithic DC/DC regulators, engineered for high-efficiency, ultra-compact point-of-load conversion in space- and thermal-constrained applications including automotive, telecom, and computing infrastructure.
FAQ
What is the output voltage tolerance of the LTC3303ARUCM#TRPBF over temperature?
The LTC3303ARUCM#TRPBF maintains ±1% output voltage accuracy over its full operating junction temperature range of –40°C to +150°C. This specification applies to the factory-programmed 1.0V output and is guaranteed by internal trimming during production - no external calibration is needed. The LTC3303ARUCM#TRPBF achieves this stability through a precision bandgap reference and matched internal resistor network, ensuring consistent regulation across automotive and industrial thermal profiles.
Can the LTC3303ARUCM#TRPBF operate with an input voltage as low as 2.25V while delivering 4A at 1.0V?
Yes, the LTC3303ARUCM#TRPBF supports 2.25V input at full 4A load with 1.0V output, achieving ~82% efficiency per typical curves (Figure G24). Its 27ns minimum on-time and 100% duty cycle capability enable stable operation at 44% duty ratio. However, RDS(ON) increases at low VIN, so thermal design must account for higher conduction losses - the 48.9°C/W θJA requires ≤60°C ambient for reliable 4A operation without forced airflow.
How does the MODE/SYNC pin configure operating modes on the LTC3303ARUCM#TRPBF?
The MODE/SYNC pin on the LTC3303ARUCM#TRPBF selects three distinct modes: floating enables pulse-skipping; connection to AGND forces continuous conduction; and connection to AVIN activates low-ripple Burst Mode®. When driven by an external 2MHz square wave, it synchronizes switching while locking to forced continuous mode. The LTC3303ARUCM#TRPBF's internal detection circuitry ensures glitch-free transitions between modes without output disturbance.
Is the LTC3303ARUCM#TRPBF pin-compatible with other members of the LTC3303 family?
Yes, all LTC3303 variants - including LTC3303CRUCM#TRPBF (6MHz), LTC3303AJUCM#WTRPBF (automotive), and adjustable versions - share identical 12-pin FCQFN pinout and footprint. The LTC3303ARUCM#TRPBF differs only in factory-programmed 1.0V output and 2MHz oscillator trim; no PCB changes are required when substituting within the same package variant, though MODE/SYNC and feedback configurations may need adjustment for adjustable versions.
Does the LTC3303ARUCM#TRPBF include protection features for short-circuit or overtemperature events?
Yes, the LTC3303ARUCM#TRPBF integrates multiple protection mechanisms: output short-circuit protection via valley current limiting (IVALLEYMAX = 5.2A), overvoltage protection triggering at 110% of nominal output with 120µs delay, and thermal shutdown at ~165°C junction temperature. During faults, the LTC3303ARUCM#TRPBF pulls PGOOD low and enters hiccup or latch-off mode depending on severity - ensuring system-level safety without external supervision circuits.
LTC3303ARUCM#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:
- 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-TQFN (2x2)
LTC3303ARUCM#TRPBF FAQ
1.How can I place an order for LTC3303ARUCM#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3303ARUCM#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 LTC3303ARUCM#TRPBF reliable?
The price and inventory of LTC3303ARUCM#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3303ARUCM#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3303ARUCM#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3303ARUCM#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3303ARUCM#TRPBF?
LTC3303ARUCM#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3303ARUCM#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 LTC3303ARUCM#TRPBF?
For technical support, including LTC3303ARUCM#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3303ARUCM#TRPBF requirements.
6.How does Aetrix verify that LTC3303ARUCM#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3303ARUCM#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 LTC3303ARUCM#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3303ARUCM#TRPBF?
All LTC3303ARUCM#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3303ARUCM#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 LTC3303ARUCM#TRPBF part is unused and in its original packaging.
Return procedure for LTC3303ARUCM#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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