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Analog Devices Inc. LTC3315AJV#WTRPBF
- Part No.:
- LTC3315AJV#WTRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-VFQFN Exposed Pad
- Datasheet:
-
LTC3315AJV#WTRPBF.pdf
- Description:
- IC REG BUCK ADJ 2A/2A DL 12LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,107
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Product details
Overview
LTC3315AJV#WTRPBF from Analog Devices is a dual-channel monolithic synchronous step-down DC/DC converter delivering 2A per channel from a 2.25V–5.5V input, operating at 2MHz fixed frequency with 25ns minimum on-time and ±1% output voltage accuracy. It integrates two independent buck regulators in a thermally enhanced 2mm × 2mm LQFN package, supporting automotive-grade operation up to 150°C junction temperature and used in FPGA core supplies and distributed POL systems.
For engineers reviewing the LTC3315AJV#WTRPBF datasheet, LTC3315AJV#WTRPBF pinout, LTC3315AJV#WTRPBF application, or LTC3315AJV#WTRPBF equivalent, key selection criteria include its dual 2A output capability, AEC-Q100 qualification, forced continuous/pulse-skipping/Burst Mode® operation modes, 19mΩ NMOS / 75mΩ PMOS RDS(ON), and MODE/SYNC pin for external clock synchronization up to 3MHz.
Technical Context
The LTC3315AJV#WTRPBF implements peak current mode control with internal compensation and 180° interleaved switching between channels to reduce input/output ripple and improve transient response. Its dual-buck architecture shares VIN and GND connections but maintains independent FB, EN, and SW pins for flexible output configuration and sequencing.
It supports three operating modes via the MODE/SYNC pin: forced continuous (floating), pulse-skipping (grounded), and Burst Mode® (tied to VIN), each optimized for different load conditions-enabling high efficiency at light loads (Burst Mode®) or low-noise constant-frequency operation across full load range (forced continuous).
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 1.2V/1.8V I/O domains. |
| Output Accuracy | ±1% - ensures stable power delivery for precision analog and digital logic under line/load/temperature variation. |
| Switching Frequency | 2MHz (default), synchronizable 1–3MHz - allows compact 880nH inductors and tight layout for space-constrained PCBs. |
| Min On-Time | 25ns - enables high step-down ratios (e.g., 5.5V→0.5V at 2MHz) without pulse skipping at light loads. |
| Thermal Rating | Junction temp up to 150°C - qualified per AEC-Q100 Grade 1, suitable for under-hood automotive and industrial environments. |
| Quiescent Current | 1.2µA shutdown, 70µA Burst Mode (both bucks sleeping) - extends battery life in always-on systems. |
Pinout & Package
Package: 12-lead 2mm × 2mm × 0.74mm LQFN with exposed thermal pad (Pin 13 = GND). Pinout validated per Analog Devices LTC3315A Rev. B datasheet Figure 1 (LQFN top view).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN1 (Pin 1) | Buck 1 enable input | Active-high with 400mV precision threshold; supports resistor-divider sequencing from upstream rail. |
| FB1 (Pin 2) | Buck 1 feedback node | Regulates VOUT1 to 500mV reference; connects to resistor divider mid-point for programmable output. |
| FB2 (Pin 3) | Buck 2 feedback node | Independent 500mV reference for VOUT2; enables dual-output voltage programming (e.g., 1.2V + 1.8V). |
| EN2 (Pin 4) | Buck 2 enable input | Separate sequencing control; allows staggered startup or fault-isolated shutdown. |
| PGOOD (Pin 5) | Power-good open-drain output | Asserts high only when both enabled outputs are within 97–99% of target; drives system reset or enable chain. |
| SW2 (Pin 6) | Buck 2 switch node | Connects to inductor; requires short/wide trace to minimize EMI and conduction loss. |
| VIN (Pins 7, 10) | Input supply | Dual VIN pins reduce IR drop and improve thermal spreading; each requires local 10µF ceramic bypass. |
| GND (Pins 8, 9, 13) | Ground return | Exposed pad (Pin 13) must be soldered to solid PCB ground plane for θJB = 12°C/W thermal performance. |
| SW1 (Pin 11) | Buck 1 switch node | Interleaved 180° out-of-phase with SW2 to halve input ripple current and reduce bulk capacitor size. |
| MODE/SYNC (Pin 12) | Mode control & sync input | Configures operation mode (Burst/Pulse-skip/Forced Continuous) and accepts 1–3MHz external clock for EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 2A synchronous buck regulators | Enables compact dual-rail power for SoC/FPGA with shared thermal and layout resources. |
| 19mΩ NMOS / 75mΩ PMOS RDS(ON) | Reduces conduction losses at 2A, achieving >90% efficiency at 1.2V/2A from 3.3V input. |
| 180° interleaved switching | Cuts input RMS current by ~30%, allowing smaller input capacitors and lower EMI filtering cost. |
| Internal soft-start and compensation | Eliminates need for external compensation components; reduces design cycle time and BOM count. |
| AEC-Q100 Grade 1 qualification | Validated for automotive applications including ADAS domain controllers and infotainment power rails. |
Applications
| FPGA Core Supply | Automotive ADAS Domain Controller |
|---|---|
Use Scenario: Powering Xilinx Zynq UltraScale+ MPSoC core voltage (VCCINT) requiring tightly regulated 0.85V @ 2A with fast load transient response. IC Role / Device Role / Timing Role: Dual-buck regulator providing independent, sequenced 0.85V and 1.8V rails with PGOOD coordination for safe boot. Use Value: 25ns min on-time enables direct 3.3V→0.85V conversion at 2MHz, reducing inductor size by 40% vs. 1MHz alternatives. | Use Scenario: Supplying NVIDIA DRIVE Orin SoC core and memory rails in autonomous driving ECUs operating at ambient up to 105°C. IC Role / Device Role / Timing Role: AEC-Q100-qualified dual buck delivering 1.0V@2A (core) and 1.2V@2A (GPU) with thermal shutdown at 165°C. Use Value: 150°C junction rating and robust overvoltage/short-circuit protection ensure reliability in harsh under-hood environments. |
| Distributed POL for Optical Networking | Industrial IoT Edge Gateway |
Use Scenario: Point-of-load regulation for 100G optical transceiver modules requiring low-noise 3.3V and 1.2V supplies with minimal board area. IC Role / Device Role / Timing Role: Dual-channel converter operating in forced continuous mode to suppress switching noise near sensitive RF/analog circuits. Use Value: 2MHz fixed-frequency operation allows use of 1µH inductors and 22µF ceramic caps, fitting within 8mm² footprint. | Use Scenario: Powering ARM Cortex-A72-based gateway SoC with real-time Ethernet, Wi-Fi 6, and sensor interfaces in factory automation equipment. IC Role / Device Role / Timing Role: Dual-buck IC enabling independent enable/disable of compute (1.1V) and connectivity (1.8V) rails for dynamic power gating. Use Value: Precision 400mV EN thresholds support resistor-divider sequencing without external supervisors, simplifying BOM. |
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 + 5 LDOs; 1.8V/2.5V fixed outputs; no MODE/SYNC pin; max 1.2A per buck | Targeted at TI Sitara AMx processors; lacks programmable VOUT and external sync capability | Select when integrating multiple rails for specific TI SoCs and lower current (≤1.2A) is acceptable. |
| MP2451DT-LF-Z | Single 2A buck; no dual-channel integration; 3.3–36V input; no Burst Mode® or PGOOD | Requires two separate ICs for dual-rail designs; higher VIN range suits industrial 24V systems | Select when input exceeds 5.5V or dual-channel integration is not required; adds complexity for dual-rail solutions. |
Compared with TPS6521845RSLR and MP2451DT-LF-Z, the LTC3315AJV#WTRPBF uniquely delivers dual 2A programmable outputs in a 4mm² package with AEC-Q100 qualification, external clock sync, and three selectable efficiency modes-making it optimal for space-constrained, high-reliability dual-rail applications where flexibility and thermal robustness are critical.
Availability
LTC3315AJV#WTRPBF is available at Aetrix Electronics and suitable for FPGA core supplies, automotive ADAS domain controllers, and distributed POL systems requiring stable component supply, automotive-grade reliability, and compact dual-rail integration.
Supply support for LTC3315AJV#WTRPBF 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 robust dual-buck regulators targeting space-constrained, high-efficiency power delivery in automotive, computing, and optical networking applications.
FAQ
What is the maximum junction temperature rating for the LTC3315AJV#WTRPBF?
The LTC3315AJV#WTRPBF is rated for operation up to 150°C junction temperature and is qualified per AEC-Q100 Grade 1. This specification is explicitly stated in the Absolute Maximum Ratings table and confirmed in the Order Information section for the "J" grade suffix. The device incorporates overtemperature shutdown at 165°C with 5°C hysteresis to protect against sustained thermal overstress. LTC3315AJV#WTRPBF's thermal design leverages the exposed pad (Pin 13) soldered to a PCB ground plane to achieve θJB = 12°C/W.
How does the MODE/SYNC pin configure operating modes on the LTC3315AJV#WTRPBF?
The MODE/SYNC pin on the LTC3315AJV#WTRPBF selects among three distinct operating modes: grounding enables pulse-skipping mode; tying to VIN activates Burst Mode® for highest light-load efficiency; leaving floating configures forced continuous conduction mode for lowest output ripple. When driven by an external 1–3MHz square wave, the pin synchronizes both buck channels to that frequency while enforcing forced continuous operation. LTC3315AJV#WTRPBF's internal PLL locks to the external clock within microseconds, and removal detection occurs in ~10µs.
Can the LTC3315AJV#WTRPBF regulate outputs below 1V, and what is the accuracy?
Yes, the LTC3315AJV#WTRPBF regulates outputs as low as 0.5V using its 500mV internal feedback reference and external resistor dividers. Output voltage accuracy is specified as ±1% over line, load, and temperature (–40°C to 150°C), with typical feedback voltage tolerance of ±5mV (495–505mV). This accuracy is confirmed in the Electrical Characteristics table under "Regulated Feedback Voltage (VFB)" and applies to both buck channels independently. LTC3315AJV#WTRPBF achieves this via precision bandgap reference and low-input-bias-current FB pins (±20nA).
What are the key differences between the LTC3315AJV#WTRPBF and non-automotive variants like LTC3315AEV#TRPBF?
The LTC3315AJV#WTRPBF differs from LTC3315AEV#TRPBF primarily in temperature grade and automotive qualification: "J" grade supports –40°C to 150°C junction temperature versus "E" grade's –40°C to 125°C, and the "W" suffix denotes controlled manufacturing and AEC-Q100 qualification for automotive use. Both share identical electrical specs, pinout, and package. LTC3315AJV#WTRPBF undergoes additional reliability testing (e.g., HTOL, TC, UHAST) and is shipped with automotive-specific traceability documentation not provided with commercial-grade variants.
Does the LTC3315AJV#WTRPBF support independent enable and power-good signaling for each buck channel?
No-LTC3315AJV#WTRPBF provides independent EN1/EN2 inputs for per-channel enable control, but only a single open-drain PGOOD output that asserts low if *either* enabled buck falls outside its regulation window (97–99% of target) or exceeds overvoltage threshold (107–114%). There is no per-channel PGOOD signal. The PGOOD pin remains low when both bucks are disabled. LTC3315AJV#WTRPBF's block diagram and Pin Functions section confirm this shared status indicator architecture, which simplifies system monitoring but requires external logic for channel-specific fault isolation.
LTC3315AJV#WTRPBF 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:
- Adjustable
- 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, 2A
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-LQFN (2x2)
LTC3315AJV#WTRPBF FAQ
1.How can I place an order for LTC3315AJV#WTRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3315AJV#WTRPBF 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 LTC3315AJV#WTRPBF reliable?
The price and inventory of LTC3315AJV#WTRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3315AJV#WTRPBF is usually 5 days.
3.What payment methods are accepted for LTC3315AJV#WTRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3315AJV#WTRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3315AJV#WTRPBF?
LTC3315AJV#WTRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3315AJV#WTRPBF 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 LTC3315AJV#WTRPBF?
For technical support, including LTC3315AJV#WTRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3315AJV#WTRPBF requirements.
6.How does Aetrix verify that LTC3315AJV#WTRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3315AJV#WTRPBF 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 LTC3315AJV#WTRPBF meets industry standards.
7.What is the process for return or replacement of LTC3315AJV#WTRPBF?
All LTC3315AJV#WTRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3315AJV#WTRPBF, 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 LTC3315AJV#WTRPBF part is unused and in its original packaging.
Return procedure for LTC3315AJV#WTRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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