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Analog Devices Inc. LTC3315AJV#WTRMPBF
- Part No.:
- LTC3315AJV#WTRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-VFQFN Exposed Pad
- Datasheet:
-
LTC3315AJV#WTRMPBF.pdf
- Description:
- IC REG BUCK ADJ 2A/2A DL 12LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:129
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Product details
Overview
LTC3315AJV#WTRMPBF 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, with integrated 19mΩ NMOS and 75mΩ PMOS switches, 2MHz default switching frequency, ±1% output voltage accuracy, and operation up to 150°C junction temperature. It serves as a compact, high-efficiency core power supply for FPGA, ASIC, and microprocessor applications in automotive and industrial environments.
For engineers reviewing the LTC3315AJV#WTRMPBF datasheet, LTC3315AJV#WTRMPBF pinout, LTC3315AJV#WTRMPBF application, or LTC3315AJV#WTRMPBF equivalent, key selection considerations include its AEC-Q100 qualification, dual-phase 180° out-of-phase operation, 25ns minimum on-time, forced continuous/pulse-skipping/Burst Mode® control, and support for external synchronization from 1MHz to 3MHz.
Technical Context
The LTC3315AJV#WTRMPBF integrates two independent peak-current-mode buck regulators sharing a common VIN and GND network but with separate SW, FB, and EN pins. Each channel features internal compensation, soft-start, PGOOD monitoring, and overvoltage/overtemperature/short-circuit protection. Its 180° phase interleaving reduces input ripple and eases EMI filtering requirements.
Operating modes are selected via the MODE/SYNC pin: grounded for pulse-skipping, floating for forced continuous conduction, or tied to VIN for Burst Mode®. When synchronized externally (1–3MHz), both channels lock to the input clock with Buck1 aligned to rising edges and Buck2 180° out of phase - all while operating exclusively in forced continuous mode.
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. |
| Output Current | 2A per channel - enables dual-core or split-rail powering of FPGAs, SoCs, or DSPs from one IC. |
| Switching Frequency | 2MHz default, synchronizable 1–3MHz - allows use of sub-1µH inductors and <10µF ceramic output capacitors. |
| Feedback Voltage | 500mV ±1% - sets precise VOUT = 0.5V × (1 + R1/R2); enables low-noise 0.5V–VIN regulation range. |
| Min On-Time | 25ns - supports high step-down ratios (e.g., 5.5V→0.8V at 2MHz) without pulse skipping at light loads. |
| Junction Temp Range | –40°C to +150°C - qualified per AEC-Q100 Grade 0, suitable for under-hood automotive and high-temp industrial use. |
| 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). Pin assignment matches standard LQFN footprint; exposed pad must be soldered to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN1 (Pin 1) | Enable input for Buck 1 | Active-high, 400mV precision threshold; enables event-driven sequencing (e.g., triggered by upstream rail). |
| FB1 (Pin 2) | Feedback input for Buck 1 | Regulates VOUT1 to 500mV; connects to resistor divider mid-point; supports optional phase-lead capacitor for stability. |
| FB2 (Pin 3) | Feedback input for Buck 2 | Regulates VOUT2 to 500mV; independent loop control enables asymmetric outputs (e.g., 1.2V + 1.8V). |
| EN2 (Pin 4) | Enable input for Buck 2 | Independent enable with same 400mV threshold; allows staggered startup or fault-isolated shutdown. |
| PGOOD (Pin 5) | Open-drain power-good indicator | Asserts low if either enabled output falls below 97% or rises above 110% of target; used for system-level power sequencing. |
| SW2 (Pin 6) | Buck 2 switch node | Connects directly to inductor; requires short, wide trace to minimize switching losses and EMI. |
| VIN (Pins 7,10) | Main input supply | Dual VIN pins reduce IR drop and improve current sharing; each requires local low-ESR ceramic bypass (e.g., 10µF). |
| GND (Pins 8,9,13) | Power and thermal ground | Exposed pad (Pin 13) is primary thermal path; must be connected to solid internal/external ground plane. |
| SW1 (Pin 11) | Buck 1 switch node | Independent switch node for Buck 1; layout symmetry with SW2 minimizes differential noise coupling. |
| MODE/SYNC (Pin 12) | Mode select & sync input | Configures operating mode (pulse-skip/Burst/FC) or accepts external 1–3MHz clock; PLL locks within microseconds. |
Key Features
| Feature | Design Value |
|---|---|
| 180° Interleaved Dual Buck | Reduces input RMS current by ~30% vs. parallel non-interleaved converters, easing input capacitor sizing and EMI filter design. |
| Burst Mode® Operation | Delivers >85% efficiency at 1mA load with <10mVpp output ripple - ideal for always-on subsystems in automotive infotainment. |
| Internal Soft-Start & Compensation | Eliminates need for external compensation components; 0.25–3ms programmable soft-start prevents inrush current damage to downstream loads. |
| Robust Protection Suite | Includes output overvoltage lockout (107–114% VOUT), thermal shutdown (165°C), short-circuit foldback, and safe inductor saturation tolerance. |
| AEC-Q100 Qualified | Qualified per Grade 0 (–40°C to +150°C), with automotive reliability reports available - approved for safety-critical ADAS and body control modules. |
Applications
| Automotive ADAS Power Supply | FPGA Core & I/O Rail Generation |
|---|---|
|
Use Scenario: Powering radar processor SoC with dual 1.0V core and 1.8V I/O rails in engine compartment. IC Role / Device Role / Timing Role: Dual-channel synchronous buck regulator providing isolated, sequenced, and monitored DC outputs. Use Value: AEC-Q100 qualification and 150°C operation ensure reliability under hood; 25ns min on-time enables stable 1.0V@2A from 5V input at 2MHz. |
Use Scenario: Generating tightly regulated 0.85V core and 1.2V auxiliary supplies for Xilinx Kintex-7 FPGA in telecom baseband unit. IC Role / Device Role / Timing Role: Monolithic dual-buck with independent feedback and enable pins enabling precise power-up sequencing and dynamic voltage scaling. Use Value: ±1% VFB accuracy and 180° interleaving reduce output voltage deviation and input ripple, improving FPGA timing margin and signal integrity. |
| Industrial PLC CPU Module | Optical Transceiver Bias Supply |
|
Use Scenario: Providing 3.3V and 5.0V rails for ARM Cortex-A9 CPU and peripheral interface in DIN-rail mounted controller. IC Role / Device Role / Timing Role: High-density dual buck delivering 2A each with PGOOD monitoring for watchdog-triggered fail-safe shutdown. Use Value: Forced continuous mode eliminates low-load ripple; PGOOD assertion within 120µs enables fast system-level fault response. |
Use Scenario: Biasing laser diode driver and TIA in SFP+ optical module with ultra-low-noise 3.3V and clean 2.5V supplies. IC Role / Device Role / Timing Role: Dual buck operating in Burst Mode® at standby, switching to forced continuous during data bursts. Use Value: Low 1.2µA shutdown current extends module sleep time; 2MHz switching avoids interference with 10Gbps data lanes. |
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 |
|---|---|---|---|
| TPS65218D0RSLR | Single-chip PMIC with 4 buck + 5 LDOs; lower max current (1.5A/channel); no AEC-Q100 grade; 2.7–5.5V VIN. | Targeted at Sitara AM335x/AM437x processors; lacks 150°C rating and 25ns min on-time for high-ratio conversion. | Choose for cost-sensitive, non-automotive embedded systems requiring integrated LDOs and simpler sequencing. |
| MAX20075ATPA/VY+ | Automotive-qualified dual 3A buck; 3.5–36V VIN; fixed 5V/3.3V outputs; no external feedback or sync capability. | Designed for front-end power in car infotainment; wider VIN but less flexible output programming and no Burst Mode®. | Choose when input is unregulated 12V battery rail and fixed outputs suffice; avoid when adjustable VOUT or low-light-load efficiency is critical. |
Compared with TPS65218D0RSLR and MAX20075ATPA/VY+, the LTC3315AJV#WTRMPBF uniquely combines AEC-Q100 Grade 0 qualification, 25ns minimum on-time for high step-down ratios, full external feedback adjustability, and 1–3MHz synchronization - making it optimal for space-constrained, high-performance automotive and industrial point-of-load designs.
Availability
LTC3315AJV#WTRMPBF is available at Aetrix Electronics and suitable for automotive ADAS modules, FPGA-based telecom equipment, and industrial PLC CPU power supplies requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3315AJV#WTRMPBF 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.
The LTC3315A product line delivers highly integrated, thermally robust dual buck regulators optimized for space-constrained, high-reliability point-of-load applications in automotive and industrial environments - emphasizing low quiescent current, wide temperature operation, and flexible mode control.
FAQ
What is the maximum junction temperature rating for the LTC3315AJV#WTRMPBF?
The LTC3315AJV#WTRMPBF is rated for operation from –40°C to +150°C junction temperature and is qualified per AEC-Q100 Grade 0. This rating is confirmed in the Absolute Maximum Ratings table and Operating Junction Temperature section of the official datasheet Rev. B. The device includes overtemperature shutdown at 165°C with 5°C hysteresis to protect against sustained thermal overstress. Thermal derating applies above 125°C for long-term reliability.
Does the LTC3315AJV#WTRMPBF support external clock synchronization, and what is the valid frequency range?
Yes, the LTC3315AJV#WTRMPBF supports external clock synchronization via the MODE/SYNC pin across a 1MHz to 3MHz range. When an external square wave is applied, the internal PLL locks both buck channels to the input clock - Buck1 aligned to rising edges and Buck2 180° out of phase. During synchronization, the device operates exclusively in forced continuous mode, and slope compensation automatically adapts to the input frequency. The minimum SYNC pulse width is 40ns.
How does the PGOOD pin function on the LTC3315AJV#WTRMPBF, and what are its thresholds?
The PGOOD pin on the LTC3315AJV#WTRMPBF is an open-drain output that asserts low if either enabled buck's output falls below 97% or rises above 110% of its regulated value. It has a 120µs delay from fault detection to assertion and a 10kΩ pull-down resistance when active. When both bucks are disabled, PGOOD is held low. The pin is not internally pulled up; an external pull-up resistor (typically 10–100kΩ to VIN or logic rail) is required for proper logic-level signaling.
Can the LTC3315AJV#WTRMPBF operate with only one buck enabled, and what is its quiescent current in that state?
Yes, the LTC3315AJV#WTRMPBF supports independent enable/disable of each buck via EN1 and EN2. With one buck enabled and operating in Burst Mode®, the typical VIN quiescent current is 70µA (sleeping) or 1.5mA (not sleeping). In shutdown (both EN pins <375mV), total quiescent current drops to 1.2µA. The disabled buck's SW pin enters high-impedance state, eliminating shoot-through risk and minimizing leakage.
What package type and thermal characteristics apply to the LTC3315AJV#WTRMPBF?
The LTC3315AJV#WTRMPBF uses the 12-lead 2mm × 2mm × 0.74mm LQFN package with exposed thermal pad (Pin 13 = GND). Its thermal metrics include θJA = 51°C/W, θJCBOTTOM = 8.6°C/W, and θJB = 12°C/W (per JESD51-7 on JEDEC 2S2P board). For reliable operation at 150°C junction, the PCB must provide adequate copper area under the exposed pad and low-thermal-resistance vias to inner ground planes.
LTC3315AJV#WTRMPBF 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#WTRMPBF FAQ
1.How can I place an order for LTC3315AJV#WTRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3315AJV#WTRMPBF 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#WTRMPBF reliable?
The price and inventory of LTC3315AJV#WTRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3315AJV#WTRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3315AJV#WTRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3315AJV#WTRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3315AJV#WTRMPBF?
LTC3315AJV#WTRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3315AJV#WTRMPBF 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#WTRMPBF?
For technical support, including LTC3315AJV#WTRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3315AJV#WTRMPBF requirements.
6.How does Aetrix verify that LTC3315AJV#WTRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3315AJV#WTRMPBF 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#WTRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3315AJV#WTRMPBF?
All LTC3315AJV#WTRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3315AJV#WTRMPBF, 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#WTRMPBF part is unused and in its original packaging.
Return procedure for LTC3315AJV#WTRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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