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Analog Devices Inc. LTC3315BEV#TRPBF
- Part No.:
- LTC3315BEV#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-VFQFN Exposed Pad
- Datasheet:
-
LTC3315BEV#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 2A/2A DL 12LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,366
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Product details
Overview
LTC3315BEV#TRPBF 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 as low as 500mV with ±1% accuracy and 6MHz fixed switching frequency in a thermally enhanced 2mm × 2mm LQFN-12 package. It integrates two independent buck regulators with shared MODE/SYNC control, precision 400mV enable thresholds, and PGOOD monitoring - deployed in FPGA core supplies, telecom POL systems, and automotive infotainment power rails.
For engineers reviewing the LTC3315BEV#TRPBF datasheet, LTC3315BEV#TRPBF pinout, LTC3315BEV#TRPBF application, or LTC3315BEV#TRPBF equivalent, key selection criteria include its 25ns minimum on-time, 19mΩ NMOS / 75mΩ PMOS RDS(ON), Burst Mode® operation for <1.2µA shutdown current, 180° out-of-phase dual-buck architecture, and AEC-Q100 qualification for automotive-grade reliability.
Technical Context
The LTC3315BEV#TRPBF implements peak current mode control with internal compensation and 180° phase interleaving between its two buck channels to reduce input/output ripple and improve transient response. Its constant-frequency 6MHz operation (synchronizable from 3MHz to 10MHz) leverages a 25ns minimum on-time to support high VIN-to-VOUT ratios at small duty cycles.
Each channel features independent EN/FB/SW pins, precision 500mV feedback reference, and integrated protection including output overvoltage lockout (110% VOUT), thermal shutdown (165°C), short-circuit recovery, and safe inductor saturation tolerance. The MODE/SYNC pin selects among forced continuous, pulse-skip, or Burst Mode® - with automatic slope compensation adaptation during external synchronization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.25V to 5.5V - supports single-cell Li-ion, USB PD, and 3.3V/5V system rails without pre-regulation |
| Output Current (per channel) | 2A continuous - enables compact dual-core processor or dual-rail FPGA supply with minimal external components |
| Switching Frequency | 6MHz default, 3–10MHz synchronizable - allows use of sub-470nH inductors and 10µF ceramic output caps for ultra-small footprint |
| Feedback Voltage Accuracy | ±1% over –40°C to 125°C - ensures stable 500mV regulation for precise 0.5V–VIN output setting |
| Shutdown Quiescent Current | 1.2µA typical - minimizes battery drain in always-on automotive or IoT standby modes |
| Minimum On-Time | 25ns - enables 0.5V output from 3.3V input at 6MHz (≈15% duty cycle) without pulse skipping |
| Thermal Shutdown Threshold | 165°C with 5°C hysteresis - protects against sustained overload while permitting brief high-current transients |
Pinout & Package
Package: 12-lead LQFN (2mm × 2mm × 0.74mm) with exposed thermal pad (Pin 13 = GND). Pin pitch: 0.5mm. MSL Level 3. RoHS-compliant e4 finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN1 (Pin 1) | Enable input for Buck 1 | Active-high with 400mV precision threshold; supports resistor-divider sequencing from upstream rail |
| FB1 (Pin 2) | Feedback input for Buck 1 | Regulates VOUT1 to 500mV; connects to mid-point of resistive divider for programmable output |
| FB2 (Pin 3) | Feedback input for Buck 2 | Regulates VOUT2 to 500mV; independent of FB1 for asymmetric dual-output configurations |
| EN2 (Pin 4) | Enable input for Buck 2 | Independent control for staggered power-up; same 400mV threshold as EN1 |
| PGOOD (Pin 5) | Open-drain power-good indicator | Pulled low if either enabled buck falls below 97% VOUT or exceeds 110% VOUT for >120µs |
| SW2 (Pin 6) | Switch node for Buck 2 | Connects directly to inductor; requires short, wide PCB trace to minimize EMI and losses |
| VIN (Pins 7, 10) | Main input supply | Dual pins reduce IR drop and improve thermal dissipation; must be bypassed locally with low-ESR capacitors |
| GND (Pins 8, 9, 13) | Ground reference and thermal path | Exposed pad (Pin 13) must be soldered to solid PCB ground plane for θJA = 51°C/W performance |
| SW1 (Pin 11) | Switch node for Buck 1 | Phase-shifted 180° from SW2 to reduce input current ripple by ~40% |
| MODE/SYNC (Pin 12) | Mode selection & clock sync input | Configures Burst Mode® (VIN), pulse-skip (GND), or forced continuous (float); accepts 3–10MHz external clock |
Key Features
| Feature | Design Value |
|---|---|
| Dual 2A synchronous bucks in single LQFN | Eliminates need for two discrete converters - saves >30% board area vs discrete solutions |
| 180° interleaved switching | Reduces input RMS current by ~30%, enabling smaller input capacitors and lower EMI filtering cost |
| Burst Mode® with <1.2µA shutdown current | Extends battery life in automotive telematics and portable industrial sensors during idle periods |
| Internal soft-start (0.25–3ms) | Prevents inrush current damage to input source and avoids output overshoot during cold boot |
| AEC-Q100 Grade E (–40°C to +125°C) | Qualified for under-hood and ADAS applications without derating; includes production lot traceability |
| Output overvoltage protection (110% VOUT) | Shuts off PMOS within nanoseconds upon FB overvoltage - prevents damage to downstream 1.8V/2.5V logic |
Applications
| Automotive Infotainment Power | FPGA Core & I/O Rail Supply |
|---|---|
Use Scenario: Dual-rail power for SoC-based head units requiring isolated 1.2V core and 3.3V I/O supplies from 5V vehicle bus. IC Role / Device Role / Timing Role: Primary dual-output DC/DC regulator managing dynamic load steps up to 2A/channel during video decode bursts. Use Value: 6MHz switching and 25ns min-on-time maintain regulation during 5V→1.2V conversion without pulse skipping; PGOOD enables fail-safe MCU reset. |
Use Scenario: Compact point-of-load supply for Xilinx Artix-7 FPGA with separate 1.0V core and 2.5V auxiliary rails on space-constrained carrier board. IC Role / Device Role / Timing Role: Monolithic dual-buck controller delivering fast transient response (<10µs) to handle FPGA configuration current surges. Use Value: 180° phase interleaving cuts input capacitor RMS current by 35%, allowing use of three 10µF 0402 ceramics instead of larger 22µF devices. |
| Optical Networking Line Cards | Industrial PLC CPU Module |
Use Scenario: Distributed 3.3V and 1.8V supplies for SFP+ transceiver ASICs and SerDes interfaces in compact 1RU switches. IC Role / Device Role / Timing Role: High-density POL regulator operating from intermediate 5V backplane with strict EMI limits. Use Value: 10MHz sync capability aligns switching to system clock, eliminating beat frequencies; LQFN thermal pad sustains 2A loads at 70°C ambient. |
Use Scenario: Redundant dual-output supply for ARM Cortex-A9 CPU module in DIN-rail mounted PLC, requiring extended temperature operation. IC Role / Device Role / Timing Role: AEC-Q100 qualified buck pair providing fault-tolerant 1.1V core and 3.3V peripheral rails with PGOOD monitoring. Use Value: Thermal shutdown at 165°C and –40°C to +125°C rating ensure reliable operation inside sealed enclosures without active cooling. |
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 (Monolithic Power) | Single 3A buck; no dual-channel integration; 2.5–5.5V input; 500kHz–2.2MHz sync range | Requires two ICs for dual-rail design; lacks PGOOD, soft-start, and Burst Mode® | Lower cost for non-interleaved, lower-frequency designs where board area is less constrained |
| TPS65218D0 (Texas Instruments) | Power management IC with dual 2.5A bucks + LDOs + battery charger; 2.7–5.5V input; 2.2MHz max frequency | Higher integration but larger 4mm × 4mm QFN; not AEC-Q100 qualified; fixed 1.8V/3.3V LDOs limit flexibility | Better for battery-backed systems needing integrated charging, but over-specified for pure dual-buck POL needs |
Compared with MP2491DS-LF-Z and TPS65218D0, the LTC3315BEV#TRPBF uniquely delivers dual 2A channels in a 2mm × 2mm footprint with 6MHz operation, AEC-Q100 qualification, and true 180° interleaving - making it optimal for space- and thermal-constrained automotive and telecom POL applications where discrete dual-buck solutions increase BOM count and layout complexity.
Availability
LTC3315BEV#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, FPGA power delivery, and optical networking applications requiring stable component supply, long-term lifecycle support, and AEC-Q100 compliance.
Supply support for LTC3315BEV#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 (now part of Analog Devices, Inc., following merger with Maxim Integrated) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LTC3315B product line delivers ultra-compact, high-frequency dual buck regulators targeting space-constrained, high-reliability applications in automotive, telecom, and industrial systems - emphasizing thermal efficiency, light-load efficiency, and seamless integration into complex power trees.
FAQ
What is the maximum junction temperature specification for the LTC3315BEV#TRPBF?
The LTC3315BEV#TRPBF has a maximum junction temperature of 125°C for continuous operation, with overtemperature shutdown activating at 165°C (typical) and hysteresis of 5°C. This Grade E variant is rated for operation from –40°C to +125°C ambient, and its thermal design relies on proper soldering of the exposed pad to a PCB ground plane to achieve θJA = 51°C/W. Exceeding 125°C junction temperature continuously degrades lifetime reliability.
Does the LTC3315BEV#TRPBF support independent voltage programming for each output channel?
Yes, the LTC3315BEV#TRPBF supports fully independent voltage programming via separate FB1 and FB2 pins, each regulated to a precise 500mV (±1%) internal reference. By using distinct resistor dividers on FB1 and FB2, designers can set different output voltages - for example, 1.0V on Channel 1 and 2.5V on Channel 2 - without cross-coupling or shared feedback components.
Can the LTC3315BEV#TRPBF operate with only one buck enabled while the other remains disabled?
Yes, the LTC3315BEV#TRPBF supports independent channel enable/disable via EN1 and EN2 pins. When only one buck is enabled, the other remains in shutdown with its SW pin in high-impedance state and contributes only ~45µA quiescent current. PGOOD remains low until both enabled channels meet their 97–99% VOUT window; if only one channel is enabled, PGOOD reflects that channel's status alone.
What is the purpose of the MODE/SYNC pin on the LTC3315BEV#TRPBF, and how does it affect efficiency?
The MODE/SYNC pin on the LTC3315BEV#TRPBF selects operating mode: grounded for pulse-skip, floated for forced continuous, or tied to VIN for Burst Mode®. Burst Mode® delivers highest light-load efficiency (<1.2µA shutdown, ~20µA at 1mA load), while forced continuous provides lowest output ripple and best transient response. Syncing to an external 3–10MHz clock overrides mode selection and forces continuous operation with adaptive slope compensation.
Is the LTC3315BEV#TRPBF pin-compatible with earlier LTC3315 versions such as the LTC3315E?
No, the LTC3315BEV#TRPBF is not pin-compatible with legacy LTC3315E variants. While both share the same LQFN-12 package outline and pin numbering, the LTC3315B introduces updated internal circuitry including improved current limits (2.9A PMOS, 2.7A NMOS), tighter feedback accuracy (±1%), and enhanced Burst Mode® behavior. Migration requires validation of timing, loop stability, and protection thresholds per the Rev. 0 datasheet.
LTC3315BEV#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:
- 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:
- 6MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-LQFN (2x2)
LTC3315BEV#TRPBF FAQ
1.How can I place an order for LTC3315BEV#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3315BEV#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 LTC3315BEV#TRPBF reliable?
The price and inventory of LTC3315BEV#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3315BEV#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3315BEV#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3315BEV#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3315BEV#TRPBF?
LTC3315BEV#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3315BEV#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 LTC3315BEV#TRPBF?
For technical support, including LTC3315BEV#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3315BEV#TRPBF requirements.
6.How does Aetrix verify that LTC3315BEV#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3315BEV#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 LTC3315BEV#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3315BEV#TRPBF?
All LTC3315BEV#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3315BEV#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 LTC3315BEV#TRPBF part is unused and in its original packaging.
Return procedure for LTC3315BEV#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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