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Analog Devices Inc. LTC3315AIV#TRMPBF
- Part No.:
- LTC3315AIV#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-VFQFN Exposed Pad
- Datasheet:
-
LTC3315AIV#TRMPBF.pdf
- Description:
- IC REG BUCK 0.5V 2A DL 12LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,051
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Product details
Overview
LTC3315AIV#TRMPBF from Analog Devices is a dual-channel monolithic synchronous step-down DC/DC converter IC delivering 2A per channel from a 2.25V–5.5V input, regulating outputs down to 0.5V with ±1% feedback accuracy and 2MHz default switching frequency in a thermally enhanced 2mm × 2mm LQFN-12 package. It supports forced continuous, pulse-skipping, and Burst Mode® operation for optimized efficiency across load ranges and is qualified for industrial applications (–40°C to +125°C).
For engineers reviewing the LTC3315AIV#TRMPBF datasheet, LTC3315AIV#TRMPBF pinout, LTC3315AIV#TRMPBF application, or LTC3315AIV#TRMPBF equivalent, key selection considerations include its dual 2A output capability, 25ns minimum on-time, integrated 19mΩ NMOS / 75mΩ PMOS power switches, precision 400mV enable thresholds, and 180° out-of-phase interleaved operation for reduced input ripple.
Technical Context
The LTC3315AIV#TRMPBF integrates two independent peak-current-mode controlled buck regulators sharing a common oscillator and MODE/SYNC interface. Each channel features dedicated EN, FB, and SW pins, enabling independent enable sequencing and output voltage programming via external resistor dividers referenced to a 500mV internal bandgap.
Its 180° phase relationship between channels reduces input capacitor RMS current and EMI, while the internal PLL allows synchronization to an external 1MHz–3MHz clock applied to MODE/SYNC - forcing both channels into forced continuous mode during sync and adapting slope compensation automatically.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.25V to 5.5V - supports single-cell Li-ion, USB PD, and intermediate bus rails without pre-regulation. |
| VOUT Range | 0.5V to VIN - enables direct core supply for FPGAs, ASICs, and microprocessors requiring sub-1V rails. |
| Output Accuracy | ±1% over line, load, and temperature - ensures stable regulation for sensitive digital loads. |
| Switching Frequency | 2MHz typical (1.85–2.15MHz) - enables compact 880nH inductors and low-profile ceramic capacitors. |
| Min On-Time | 25ns - supports high VIN-to-VOUT conversion ratios (e.g., 5.5V → 0.8V at 2MHz) without pulse skipping. |
| Quiescent Current | 1.2µA shutdown, 70µA (Burst Mode, both bucks sleeping) - extends battery life in always-on systems. |
| Thermal Rating | –40°C to +125°C junction - validated for industrial and automotive under-hood environments. |
Pinout & Package
Package: 12-lead 2mm × 2mm × 0.74mm LQFN with exposed thermal pad (Pin 13 = GND). Pinout matches LTC3315A standard LQFN configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN1 (Pin 1) | Buck 1 Enable Input | Active-high with 400mV precision threshold; supports power-up sequencing via resistor divider from upstream rail. |
| FB1 (Pin 2) | Buck 1 Feedback Input | Regulates VOUT1 to 500mV; connects to mid-point of R-divider; accepts optional phase-lead capacitor for stability. |
| FB2 (Pin 3) | Buck 2 Feedback Input | Regulates VOUT2 to 500mV; independent loop control enables asymmetric output voltages (e.g., 1.2V + 1.8V). |
| EN2 (Pin 4) | Buck 2 Enable Input | Independent activation control; allows staggered startup or fault-isolated shutdown. |
| PGOOD (Pin 5) | Power Good Output | Open-drain flag asserting when both enabled outputs are within 97–99% of target and below 107–114% OV threshold. |
| SW2 (Pin 6) | Buck 2 Switch Node | Connects to inductor; requires short, wide PCB trace to minimize switching losses and EMI. |
| VIN (Pins 7,10) | Input Supply | Dual VIN pins reduce IR drop; must be tied together and bypassed locally with low-ESR ceramics. |
| GND (Pins 8,9,13) | Ground Return | Exposed pad (Pin 13) is primary thermal path; must be soldered to solid ground plane for θJA = 51°C/W. |
| SW1 (Pin 11) | Buck 1 Switch Node | 180° out-of-phase with SW2; interleaving cuts input ripple by ~70% vs. in-phase operation. |
| MODE/SYNC (Pin 12) | Mode Control & Sync Input | Low = pulse-skip; float = forced continuous; high = Burst Mode; external clock (1–3MHz) forces sync + FC mode. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 2A Synchronous Buck Regulators | Integrated 19mΩ NMOS and 75mΩ PMOS switches eliminate external MOSFETs and gate drivers, reducing BOM count and layout area. |
| 180° Interleaved Operation | Halves input capacitor RMS current and reduces conducted EMI, enabling smaller input bulk capacitance. |
| Burst Mode® with Low-Ripple Sleep | Maintains <10mVpp output ripple in sleep state while achieving 70µA quiescent current at light loads. |
| Robust Protection Suite | Includes output overvoltage lockout (107–114%), thermal shutdown (165°C), short-circuit protection, and safe inductor saturation tolerance. |
| Internal Soft-Start & Compensation | Fixed 0.25–3ms soft-start prevents inrush current; fully compensated control loop requires only FB resistors - no external compensation needed. |
Applications
| FPGA Core & I/O Supplies | Distributed POL for Telecom Systems |
|---|---|
Use Scenario: Powering Xilinx Artix-7 FPGA with separate 1.0V core and 1.8V I/O rails from a 3.3V intermediate bus. IC Role / Device Role / Timing Role: Dual-output point-of-load regulator providing tightly regulated, sequenced, low-noise DC supplies with PGOOD monitoring. Use Value: Eliminates need for two discrete buck ICs; 25ns min-on-time supports 3.3V→1.0V conversion at 2MHz, shrinking total solution size by >30%. | Use Scenario: Generating 1.2V and 2.5V rails for optical transceiver modules in 5G base station line cards. IC Role / Device Role / Timing Role: High-efficiency, thermally robust dual buck delivering 2A each with synchronized switching to meet EMI Class B limits. Use Value: 180° interleaving reduces input ripple amplitude by 2×, easing compliance with stringent CISPR 32 conducted emission requirements. |
| Industrial PLC CPU Power | Automotive ADAS Domain Controller |
Use Scenario: Supplying ARM Cortex-A53 processor (1.2V @ 1.8A) and DDR3 memory (1.5V @ 2A) in programmable logic controller mainboard. IC Role / Device Role / Timing Role: Dual-channel DC/DC with independent EN/FB pins enabling precise power-up sequencing and dynamic voltage scaling. Use Value: Precision 400mV enable thresholds allow reliable sequencing without external supervisors; –40°C to +125°C rating ensures operation in uncooled enclosures. | Use Scenario: Providing 1.1V core and 1.8V I/O rails for NVIDIA Orin SoC in autonomous driving compute module. IC Role / Device Role / Timing Role: AEC-Q100 qualified dual buck regulator supporting functional safety requirements with PGOOD fault signaling and thermal derating. Use Value: Built-in overtemperature shutdown (165°C) and output overvoltage protection meet ISO 26262 ASIL-B diagnostic coverage needs for power management. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS6521845RSLR | Single-chip PMIC with 4 buck + 4 LDOs; lower max output current (1.5A per buck); fixed 2.2MHz frequency; no external sync. | Targeted at Sitara AM335x/AM437x processors; includes integrated RTC, battery charger, and reset logic. | Select when system-level integration (PMIC + power sequencing + fuel gauge) outweighs need for higher per-rail current or external clock sync. |
| ISL8026IRZ-T7A | Dual 3A buck; 2.5MHz max frequency; no Burst Mode; higher quiescent current (300µA); no PGOOD per channel. | Optimized for high-current, high-frequency POL in networking gear; lacks light-load efficiency modes. | Select when peak current >2A is required and light-load efficiency is secondary to transient response and output current headroom. |
Compared with TPS6521845RSLR and ISL8026IRZ-T7A, the LTC3315AIV#TRMPBF delivers superior light-load efficiency via Burst Mode®, tighter output accuracy (±1% vs ±2%), and flexible mode selection/synchronization - making it optimal for space-constrained, battery-sensitive, or EMI-critical dual-rail designs.
Availability
LTC3315AIV#TRMPBF is available at Aetrix Electronics and suitable for FPGA core supplies, telecom POL systems, and industrial PLC CPU power requiring stable component supply, extended temperature support, and high-density power delivery.
Supply support for LTC3315AIV#TRMPBF 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 digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3315A product line delivers highly integrated, thermally efficient dual-output DC/DC converters for space-constrained applications demanding high efficiency across wide load ranges and robust reliability in harsh environments.
FAQ
What is the operating temperature range for the LTC3315AIV#TRMPBF?
The LTC3315AIV#TRMPBF is rated for operation from –40°C to +125°C junction temperature. This industrial-grade specification is validated across process corners and environmental stress tests, ensuring reliable performance in uncooled industrial enclosures and under-hood automotive locations where ambient temperatures exceed 85°C.
Does the LTC3315AIV#TRMPBF support external clock synchronization?
Yes, the LTC3315AIV#TRMPBF supports external clock synchronization via the MODE/SYNC pin. Applying a 1MHz–3MHz square wave to this pin locks both buck regulators to the external frequency in forced continuous mode, with Buck 1 aligned to the rising edge and Buck 2 operating 180° out of phase - critical for EMI reduction in synchronized multi-rail systems.
How does the LTC3315AIV#TRMPBF achieve high efficiency at light loads?
The LTC3315AIV#TRMPBF achieves high light-load efficiency using Burst Mode® operation: it charges the output capacitor slightly above the regulation point, then shuts down most internal circuitry while the capacitor supplies the load. When voltage drops below threshold, it wakes and delivers a burst of switching cycles - achieving 70µA quiescent current while maintaining low output ripple.
What protection features are built into the LTC3315AIV#TRMPBF?
The LTC3315AIV#TRMPBF includes output overvoltage protection (107–114% of VOUT), thermal shutdown (165°C with 5°C hysteresis), short-circuit protection, and safe inductor saturation tolerance. Its PGOOD pin asserts only when both enabled outputs are within valid regulation windows, providing system-level fault detection without external monitoring.
Can the two buck regulators on the LTC3315AIV#TRMPBF be operated independently?
Yes, the LTC3315AIV#TRMPBF supports fully independent operation: EN1 and EN2 enable separate control of each buck, FB1 and FB2 allow different output voltages (e.g., 1.2V and 1.8V), and each SW node operates with its own current limit and soft-start timing. Disabling one buck reduces total quiescent current and eliminates its switching noise, improving system-level PSRR.
LTC3315AIV#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 2.25V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.5V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 2A
- Frequency - Switching:
- 1MHz ~ 3MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-LQFN (2x2)
LTC3315AIV#TRMPBF FAQ
1.How can I place an order for LTC3315AIV#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3315AIV#TRMPBF 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 LTC3315AIV#TRMPBF reliable?
The price and inventory of LTC3315AIV#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3315AIV#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3315AIV#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3315AIV#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3315AIV#TRMPBF?
LTC3315AIV#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3315AIV#TRMPBF 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 LTC3315AIV#TRMPBF?
For technical support, including LTC3315AIV#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3315AIV#TRMPBF requirements.
6.How does Aetrix verify that LTC3315AIV#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3315AIV#TRMPBF 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 LTC3315AIV#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3315AIV#TRMPBF?
All LTC3315AIV#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3315AIV#TRMPBF, 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 LTC3315AIV#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3315AIV#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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