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Analog Devices Inc. LTC3315AIV#TRPBF
- Part No.:
- LTC3315AIV#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-VFQFN Exposed Pad
- Datasheet:
-
LTC3315AIV#TRPBF.pdf
- Description:
- IC REG BUCK 0.5V 2A DL 12LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,864
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Product details
Overview
LTC3315AIV#TRPBF from Analog Devices is a dual-channel monolithic synchronous step-down DC/DC converter IC delivering up to 2A per channel from a 2.25V–5.5V input, regulating outputs as low as 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 AEC-Q100 qualified for automotive power rails.
For engineers reviewing the LTC3315AIV#TRPBF datasheet, LTC3315AIV#TRPBF pinout, LTC3315AIV#TRPBF application, or LTC3315AIV#TRPBF equivalent, key selection criteria include its dual 2A output capability, 25ns minimum on-time, integrated 19mΩ NMOS / 75mΩ PMOS switches, precision 400mV enable thresholds, and 180° out-of-phase interleaving for reduced input ripple in POL and FPGA core supply designs.
Technical Context
The LTC3315AIV#TRPBF integrates two independent peak-current-mode controlled buck regulators sharing a common oscillator and MODE/SYNC interface. Each channel features separate EN, FB, and SW pins, enabling independent sequencing and output programming, while internal 180° phase alignment minimizes input capacitor RMS current.
Its constant-frequency architecture supports synchronization from 1MHz to 3MHz via the MODE/SYNC pin, with automatic slope compensation adaptation. The device implements forward/reverse inductor current limiting, thermal shutdown, output overvoltage protection (107–114% VOUT), and PGOOD monitoring with 120µs delay - all within a single compact LQFN package rated for –40°C to 125°C junction temperature.
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 regulation of sub-1V FPGA/ASIC cores and I/O supplies. |
| Output Accuracy | ±1% over temp - ensures stable voltage margins for sensitive digital loads under thermal stress. |
| Switching Frequency | 2MHz default, syncable 1–3MHz - allows use of <1µH inductors and reduces solution footprint by >40% vs 500kHz designs. |
| Min On-Time | 25ns - enables high step-down ratios (e.g., 5.5V→0.8V at 2MHz) without pulse skipping instability. |
| Quiescent Current | 1.2µA shutdown, 70µA (Burst Mode, both bucks sleeping) - extends battery life in always-on automotive modules. |
| Thermal Rating | –40°C to 125°C operating junction - validated for under-hood automotive applications per AEC-Q100 Grade I. |
Pinout & Package
Package: 12-lead LQFN (2mm × 2mm × 0.74mm) with exposed thermal pad (Pin 13 = GND). Pin count and layout match standard QFN footprints; thermal pad must be soldered to PCB ground plane for θJA = 51°C/W performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN1 (Pin 1) | Buck 1 Enable Input | Active-high with 400mV precision threshold; enables event-driven power-up sequencing (e.g., triggered by upstream regulator's PGOOD). |
| FB1 (Pin 2) | Buck 1 Feedback Input | Regulates VOUT1 to 500mV reference; resistor divider sets output voltage with ±1% accuracy over temperature. |
| FB2 (Pin 3) | Buck 2 Feedback Input | Independent regulation node for VOUT2; supports different output voltages (e.g., 1.2V + 1.8V) on same IC. |
| EN2 (Pin 4) | Buck 2 Enable Input | Separate enable control allows staggered startup or fault isolation between channels. |
| PGOOD (Pin 5) | Power-Good Open-Drain Output | Asserts high only when both enabled outputs are within 97–99% of target; drives external reset or enable chains. |
| SW2 (Pin 6) | Buck 2 Switch Node | Connects to inductor; high dv/dt node requiring short, wide trace and local ceramic bypassing. |
| VIN (Pins 7,10) | Input Supply | Dual VIN pins reduce IR drop and improve high-frequency decoupling; each requires dedicated 10µF low-ESR ceramic cap. |
| GND (Pins 8,9,13) | Ground & Thermal Pad | Exposed pad (Pin 13) is primary thermal path; must be connected to solid internal ground plane for 12°C/W θJB. |
| SW1 (Pin 11) | Buck 1 Switch Node | 180° out-of-phase with SW2 to halve input ripple current and relax input capacitor RMS rating. |
| MODE/SYNC (Pin 12) | Mode Control & Clock Input | Configures operation mode (low = pulse-skip, float = forced continuous, high = Burst Mode) or accepts 1–3MHz sync clock. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 2A Synchronous Buck Regulators | Integrated 19mΩ NMOS and 75mΩ PMOS switches eliminate external FETs and gate drivers, reducing BOM count and layout area by >30%. |
| 180° Interleaved Operation | Halves input capacitor RMS current versus parallel non-interleaved converters, enabling smaller 10µF input caps instead of 22µF. |
| Burst Mode® with Low-Ripple Sleep | Maintains <10mVpp output ripple during light-load sleep states - critical for noise-sensitive RF and sensor subsystems. |
| Robust Protection Suite | Includes output overvoltage lockout (107–114% VOUT), thermal shutdown (165°C), short-circuit protection, and safe inductor saturation tolerance. |
| AEC-Q100 Qualified | Validated for automotive Grade I (–40°C to +125°C) with full reliability testing - suitable for ADAS domain controllers and infotainment SoC rails. |
Applications
| FPGA Core Power | Automotive ADAS Domain Controller |
|---|---|
|
Use Scenario: Powering Xilinx Zynq UltraScale+ MPSoC core rails (VCCINT @ 0.85V, VCCO @ 1.8V) from 3.3V intermediate bus in compact automotive ECU. IC Role / Device Role / Timing Role: Dual-output point-of-load regulator providing tightly regulated, low-noise, sequenced core and I/O supplies with PGOOD coordination. Use Value: 25ns min on-time enables 0.85V output at 2MHz from 3.3V input; 180° interleaving cuts input ripple by 50%, relaxing EMI filter requirements. |
Use Scenario: Supplying NVIDIA Orin SoC CPU/GPU clusters (VDD_CPU @ 1.1V, VDD_GPU @ 0.95V) in autonomous driving compute modules. IC Role / Device Role / Timing Role: High-density dual-buck regulator delivering 2A/channel with AEC-Q100 qualification and thermal derating up to 125°C junction. Use Value: 125°C-rated operation eliminates need for external thermal sensors; ±1% VOUT accuracy maintains SoC timing margins under transient load steps. |
| Optical Networking Line Cards | Industrial PLC I/O Modules |
|
Use Scenario: Generating 1.2V and 2.5V rails for SerDes transceivers and DSPs in compact 1RU optical transport equipment. IC Role / Device Role / Timing Role: Space-constrained dual buck supplying low-noise analog and digital domains with independent enable control. Use Value: Forced continuous mode delivers <5mVpp output ripple at full load; 2MHz switching enables <880nH inductors, saving >25% board area vs 500kHz solutions. |
Use Scenario: Powering isolated microcontroller, ADC, and CAN transceiver rails in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Robust dual-output regulator supporting wide input range (2.25–5.5V) from industrial 3.3V/5V backplanes with brownout immunity. Use Value: 1.2µA shutdown current extends backup battery life; UVLO hysteresis (150mV) prevents oscillation during slow-rising industrial power rails. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2491DS-LF-Z | Single 3A buck; no dual output, no Burst Mode, 500kHz max fSW, 0.8V min VOUT | Suitable only for single-rail systems; lacks interleaving, PGOOD, and automotive qualification | Select only if cost sensitivity outweighs dual-rail functionality and automotive compliance needs. |
| TPS65218D0RSLR | PMIC with 4 buck + 4 LDO; larger 5mm × 5mm QFN, fixed 1.8V/3.3V outputs, no sync capability | Targeted at Sitara AM335x/AM437x processors; not configurable for arbitrary VOUT or high-frequency POL | Choose when powering TI ARM-based SoCs with predefined rail sets and no need for custom VOUT or 2MHz operation. |
Compared with MP2491DS-LF-Z and TPS65218D0RSLR, the LTC3315AIV#TRPBF uniquely delivers dual 2A outputs in a 2mm × 2mm footprint with 2MHz switching, AEC-Q100 qualification, and flexible mode control - making it optimal for space-constrained, high-performance automotive and telecom POL applications where discrete rail generation is required.
Availability
LTC3315AIV#TRPBF is available at Aetrix Electronics and suitable for FPGA core supplies, automotive ADAS domain controllers, and optical networking line cards requiring stable component supply with guaranteed long-term availability and automotive-grade traceability.
Supply support for LTC3315AIV#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 industrial, automotive, communications, and healthcare markets with precision power, signal chain, and RF solutions.
The LTC3315AIV#TRPBF belongs to Analog Devices' Power by Linear™ family of high-efficiency monolithic DC/DC converters, designed specifically for space-constrained, high-reliability point-of-load applications demanding fast transient response, low quiescent current, and automotive qualification.
FAQ
What is the maximum junction temperature rating for the LTC3315AIV#TRPBF?
The LTC3315AIV#TRPBF is rated for –40°C to +125°C operating junction temperature and is qualified to AEC-Q100 Grade I standards. Its absolute maximum junction temperature is 150°C, with overtemperature shutdown activating at 165°C and 5°C hysteresis. Thermal design must ensure TJ ≤ 125°C under worst-case ambient and load conditions using the provided θJA = 51°C/W and θJB = 12°C/W values.
Does the LTC3315AIV#TRPBF support independent voltage programming for each output?
Yes, the LTC3315AIV#TRPBF supports fully independent voltage programming via separate FB1 and FB2 pins, each regulated to a precise 500mV internal reference. By configuring distinct resistor dividers on FB1 and FB2, users can set different output voltages - for example, 1.2V on Channel 1 and 1.8V on Channel 2 - without cross-regulation impact due to the dual independent control loops.
Can the LTC3315AIV#TRPBF be synchronized to an external clock, and what is the supported frequency range?
Yes, the LTC3315AIV#TRPBF supports external clock synchronization via the MODE/SYNC pin across a 1MHz to 3MHz range. When an external square wave is applied, both buck regulators lock to the rising edge of the clock signal, operate in forced continuous mode, and maintain 180° phase alignment. The internal PLL acquires lock within microseconds and detects clock loss within ~10µs.
What protection features are integrated into the LTC3315AIV#TRPBF?
The LTC3315AIV#TRPBF integrates output overvoltage protection (107–114% VOUT), thermal shutdown (165°C), short-circuit protection, reverse inductor current limiting (up to 1.7A into SW), and safe inductor saturation tolerance. It also features precision PGOOD monitoring with 120µs delay and UVLO with 150mV hysteresis - all implemented without external components.
How does the LTC3315AIV#TRPBF achieve low EMI in high-density layouts?
The LTC3315AIV#TRPBF reduces EMI through 180° interleaved switching (halving input ripple current), 2MHz constant-frequency operation (shifting noise above sensitive bands), and integrated MOSFETs with controlled slew rates. Its compact 2mm × 2mm LQFN package minimizes loop area, while dual VIN and GND pins plus an exposed thermal pad provide low-inductance paths essential for clean switching waveforms.
LTC3315AIV#TRPBF 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#TRPBF FAQ
1.How can I place an order for LTC3315AIV#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3315AIV#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 LTC3315AIV#TRPBF reliable?
The price and inventory of LTC3315AIV#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3315AIV#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3315AIV#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3315AIV#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3315AIV#TRPBF?
LTC3315AIV#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3315AIV#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 LTC3315AIV#TRPBF?
For technical support, including LTC3315AIV#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3315AIV#TRPBF requirements.
6.How does Aetrix verify that LTC3315AIV#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3315AIV#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 LTC3315AIV#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3315AIV#TRPBF?
All LTC3315AIV#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3315AIV#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 LTC3315AIV#TRPBF part is unused and in its original packaging.
Return procedure for LTC3315AIV#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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