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Analog Devices Inc. LTC3315AHV#TRMPBF
- Part No.:
- LTC3315AHV#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-VFQFN Exposed Pad
- Datasheet:
-
LTC3315AHV#TRMPBF.pdf
- Description:
- IC REG BUCK 0.5V 2A DL 12LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,216
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Product details
Overview
LTC3315AHV#TRMPBF from Analog Devices is a dual-channel monolithic synchronous step-down DC/DC converter IC operating from 2.25V to 5.5V input, delivering up to 2A per channel with ±1% output voltage accuracy and 2MHz fixed switching frequency. It integrates two independent 2A buck regulators in a thermally enhanced 2mm × 2mm LQFN-12 package, supporting automotive-grade operation from –40°C to +150°C junction temperature. Used in FPGA core supplies and distributed POL systems where space, thermal performance, and AEC-Q100 compliance are critical.
For engineers reviewing the LTC3315AHV#TRMPBF datasheet, LTC3315AHV#TRMPBF pinout, LTC3315AHV#TRMPBF application, or LTC3315AHV#TRMPBF equivalent, key selection criteria include dual 2A output capability, 25ns minimum on-time, forced continuous/pulse-skipping/Burst Mode® operation, precision 400mV enable thresholds, and PGOOD signaling for system power sequencing and fault monitoring.
Technical Context
The LTC3315AHV#TRMPBF implements peak current mode control with internal compensation and 180° interleaved phase operation between its two buck channels, reducing input/output ripple and improving transient response. Each channel features independent EN, FB, and SW pins, enabling flexible power sequencing and output voltage programming down to 0.5V via external resistor dividers referenced to a 500mV internal feedback threshold.
Its MODE/SYNC pin supports three operating modes: pulse-skipping (MODE/SYNC grounded), Burst Mode® (MODE/SYNC tied to VIN), and forced continuous (MODE/SYNC floating); when synchronized to an external 1–3MHz clock, both channels lock to the reference with automatic slope compensation adaptation and operate 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 compact dual-rail core supplies for FPGAs, ASICs, and microprocessors. |
| Switching Frequency | 2MHz (default), synchronizable 1–3MHz - allows use of sub-1µH inductors and reduces solution footprint. |
| Feedback Voltage | 500mV ±5mV - enables precise output regulation from 0.5V to VIN using standard resistor ratios. |
| Min On-Time | 25ns - supports high VIN-to-VOUT conversion ratios (e.g., 5.5V → 0.8V) at 2MHz without pulse skipping. |
| Shutdown Current | 1.2µA - minimizes battery drain in always-on automotive or industrial standby systems. |
| Thermal Rating | Junction temp range –40°C to +150°C - qualified per AEC-Q100 Grade H for under-hood automotive applications. |
Pinout & Package
Package: 12-lead 2mm × 2mm × 0.74mm LQFN with exposed thermal pad (Pin 13 = GND). Requires soldering of exposed pad to PCB ground plane for rated thermal performance (θJA = 51°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN1 (Pin 1) | Enable input for Buck 1 | Active-high with 400mV precision threshold; supports event-driven sequencing via resistor divider from upstream rail. |
| FB1 (Pin 2) | Feedback input for Buck 1 | Regulated to 500mV; sets VOUT1 = 500mV × (1 + R1/R2); phase-lead capacitor improves load transient response. |
| FB2 (Pin 3) | Feedback input for Buck 2 | Independent 500mV reference; enables asymmetric dual outputs (e.g., 1.2V + 1.8V) with separate resistor networks. |
| EN2 (Pin 4) | Enable input for Buck 2 | Independent sequencing control; allows staggered startup or fault-isolated shutdown per rail. |
| PGOOD (Pin 5) | Open-drain power-good indicator | Asserts low if either enabled output falls below 97% or rises above 110% of target; enables system-level fault detection. |
| SW2 (Pin 6) | Switch node for Buck 2 | Connects to inductor; requires short, wide trace to minimize EMI and conduction losses. |
| VIN (Pins 7,10) | Main input supply | Dual VIN pins reduce IR drop and improve current sharing; each must be bypassed with low-ESR ceramic capacitors. |
| GND (Pins 8,9,13) | Ground reference and thermal path | Exposed pad (Pin 13) is primary thermal interface; must be soldered to solid ground plane for θJB = 12°C/W. |
| SW1 (Pin 11) | Switch node for Buck 1 | Interleaved 180° out-of-phase with SW2; reduces input ripple current by ~70% vs. non-interleaved dual bucks. |
| MODE/SYNC (Pin 12) | Mode selection & sync input | Configures operating mode (pulse-skip/Burst/FC) or accepts 1–3MHz external clock; enables deterministic EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Interleaved 180° phase operation | Reduces input RMS current by ~70%, lowering input capacitor stress and EMI filter size requirements. |
| 25ns minimum on-time | Enables high-step-down ratios (e.g., 5.5V → 0.8V) at 2MHz without requiring pulse skipping or frequency foldback. |
| Burst Mode® with low-noise sleep | Achieves >85% efficiency at 1mA load while maintaining <10mVpp output ripple-critical for always-on sensor nodes. |
| Integrated 19mΩ NMOS / 75mΩ PMOS switches | Eliminates external MOSFETs and gate drivers; delivers >90% peak efficiency at 2A with 3.3V→1.2V conversion. |
| Internal soft-start and compensation | Reduces design complexity: no external compensation network required; 1ms typical soft-start time limits inrush current. |
| AEC-Q100 Grade H qualification | Validated for automotive under-hood operation (–40°C to +150°C TJ); includes overtemperature shutdown with 5°C hysteresis. |
Applications
| FPGA Core Power Supply | Automotive ADAS Domain Controller |
|---|---|
|
Use Scenario: Powering dual-voltage FPGA cores (e.g., 0.85V PL + 1.2V PS) from a 3.3V or 5V intermediate rail in compact automotive ECUs. IC Role / Device Role / Timing Role: Dual-channel synchronous buck regulator providing tightly regulated, sequenced, and monitored core rails with PGOOD assertion. Use Value: Interleaved operation cuts input capacitance by 50%; AEC-Q100 H-grade ensures reliability at 150°C junction temperature. |
Use Scenario: Generating 1.8V I/O and 1.2V core rails for radar SoCs in front-end ADAS modules exposed to engine bay temperatures. IC Role / Device Role / Timing Role: High-density dual-buck regulator with independent enable/control per rail and robust thermal management. Use Value: 2mm × 2mm LQFN package fits constrained PCB areas; 150°C max junction rating eliminates derating in hot zones. |
| Industrial PLC I/O Module | Optical Network Line Card |
|
Use Scenario: Delivering isolated 3.3V and 5V auxiliary rails from a 12V backplane in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Dual-output POL regulator with pulse-skipping mode for variable load profiles and low-noise Burst Mode® during idle. Use Value: 1.2µA shutdown current extends backup battery life; PGOOD enables watchdog-triggered system reset on rail failure. |
Use Scenario: Providing 2.5V transceiver bias and 1.2V SerDes core power in space-constrained optical line cards with strict EMI limits. IC Role / Device Role / Timing Role: Synchronizable dual-buck regulator enabling deterministic 2MHz switching aligned to system clock to suppress beat frequencies. Use Value: MODE/SYNC pin allows EMI shaping via external clock injection; 25ns min on-time supports 12V→2.5V conversion at 2MHz. |
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 per buck (1.5A); no 25ns min on-time; 1.8V–5.5V VIN. | Targets full-system power management (AM335x/AM437x); not optimized for high-current dual-rail only designs. | Choose when integrating multiple rails and LDOs is prioritized over per-buck current density and ultra-small footprint. |
| ISL8026IRZ-T7A | Dual 3A buck; 2.7V–5.5V VIN; 500kHz–4MHz sync range; no Burst Mode®; 40ns min on-time; -40°C to +125°C. | Higher current per channel but larger 4mm × 4mm QFN; lacks automotive temperature grade and low-IQ Burst Mode®. | Choose for higher current headroom and wider sync range where AEC-Q100 and sub-2µA shutdown are not required. |
Compared with TPS65218D0RSLR and ISL8026IRZ-T7A, the LTC3315AHV#TRMPBF delivers superior current density (2A in 4mm²), automotive-grade thermal robustness (150°C), and lowest-light-load efficiency via Burst Mode®, making it optimal for space- and reliability-critical dual-rail applications.
Availability
LTC3315AHV#TRMPBF is available at Aetrix Electronics and suitable for FPGA core supplies, automotive ADAS domain controllers, and industrial PLC I/O modules requiring stable component supply with AEC-Q100 qualification and long-term production continuity.
Supply support for LTC3315AHV#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, 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 optimized dual-buck regulators for space-constrained point-of-load applications demanding automotive reliability, fast transient response, and minimal external components.
FAQ
What is the maximum junction temperature rating for LTC3315AHV#TRMPBF?
The LTC3315AHV#TRMPBF is rated for operation from –40°C to +150°C junction temperature and is qualified per AEC-Q100 Grade H. This rating is confirmed in the "Order Information" table and "Absolute Maximum Ratings" section of the datasheet, where LTC3315AH devices specify TJMAX = 150°C and operating range –40°C to 150°C. Thermal derating above 125°C is recommended for extended lifetime.
Does LTC3315AHV#TRMPBF support independent enable and feedback for each buck channel?
Yes, LTC3315AHV#TRMPBF provides fully independent control: EN1/FB1/SW1 for Buck 1 and EN2/FB2/SW2 for Buck 2. Pin functions are explicitly defined in the "PIN FUNCTIONS" section, confirming separate enable thresholds (400mV), feedback references (500mV), and switch nodes. This enables asymmetric outputs (e.g., 1.2V and 1.8V) and staggered power-up sequencing.
What are the supported operating modes of LTC3315AHV#TRMPBF and how are they selected?
LTC3315AHV#TRMPBF supports three modes via the MODE/SYNC pin: pulse-skipping (pin grounded), Burst Mode® (pin tied to VIN), and forced continuous (pin floating). When an external 1–3MHz clock is applied, it synchronizes both channels in forced continuous mode. This behavior is documented in the "Mode Selection" and "Oscillator and MODE/SYNC" sections of the datasheet.
Can LTC3315AHV#TRMPBF regulate output voltages below 1V?
Yes, LTC3315AHV#TRMPBF regulates outputs as low as 0.5V using external resistor dividers on FB1/FB2, referenced to its 500mV internal feedback voltage. The "DESCRIPTION" section states "The LTC3315A can regulate outputs as low as 500mV", and electrical characteristics confirm VFB = 495–505mV across temperature, enabling accurate sub-1V core rails for modern processors and FPGAs.
What package type and thermal specifications apply to LTC3315AHV#TRMPBF?
LTC3315AHV#TRMPBF uses the 12-lead 2mm × 2mm × 0.74mm LQFN package with exposed thermal pad (Pin 13 = GND). Datasheet specifies θJA = 51°C/W, θJCBOTTOM = 8.6°C/W, and θJB = 12°C/W. The exposed pad must be soldered to a PCB ground plane to achieve rated thermal performance-confirmed in "PIN CONFIGURATION" and "ABSOLUTE MAXIMUM RATINGS".
LTC3315AHV#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-LQFN (2x2)
LTC3315AHV#TRMPBF FAQ
1.How can I place an order for LTC3315AHV#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3315AHV#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 LTC3315AHV#TRMPBF reliable?
The price and inventory of LTC3315AHV#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3315AHV#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3315AHV#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3315AHV#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3315AHV#TRMPBF?
LTC3315AHV#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3315AHV#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 LTC3315AHV#TRMPBF?
For technical support, including LTC3315AHV#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3315AHV#TRMPBF requirements.
6.How does Aetrix verify that LTC3315AHV#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3315AHV#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 LTC3315AHV#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3315AHV#TRMPBF?
All LTC3315AHV#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3315AHV#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 LTC3315AHV#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3315AHV#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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