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Analog Devices Inc. LTC3313EV#TRPBF
- Part No.:
- LTC3313EV#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 18-PowerTFQFN
- Datasheet:
-
LTC3313EV#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 15A 18LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,913
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Product details
Overview
LTC3313EV#TRPBF from Analog Devices is a monolithic 15A synchronous step-down DC/DC converter in a 3mm × 3mm LQFN package, operating from 2.25V to 5.5V input and delivering 0.5V–VIN output with ±1% accuracy using remote sense. It employs Silent Switcher® architecture for ultralow EMI, supports up to 5MHz switching frequency, and integrates power good, thermal monitoring, and multiphase capability for FPGA/ASIC core supplies.
For engineers reviewing the LTC3313EV#TRPBF datasheet, LTC3313EV#TRPBF pinout, LTC3313EV#TRPBF application, or LTC3313EV#TRPBF equivalent, key selection criteria include its 35ns minimum on-time, 100% duty cycle dropout operation, 500mV feedback reference, integrated 3mΩ NMOS/8mΩ PMOS switches, and AEC-Q100 qualification for automotive power delivery.
Technical Context
The LTC3313EV#TRPBF uses constant-frequency peak current mode control with a 500mV internal reference and programmable oscillator (0.5–5MHz via RT resistor or external SYNC). Its Silent Switcher® 1 architecture minimizes high-frequency EMI through optimized internal power loop layout and dual VIN/PGND paths.
It supports three operating modes-pulse-skipping, forced continuous, and external synchronization-selected via MODE/SYNC pin logic. The device implements valley-current limiting (15–19A), overvoltage protection (106–114.5% VOUT), and die temperature monitoring via SSTT pin voltage (4mV/°C slope), with thermal shutdown at 150°C junction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.25V to 5.5V - supports single-cell Li-ion, 3.3V/5V intermediate bus, and low-voltage POL systems. |
| VOUT Range | 0.5V to VIN - enables sub-1V core supplies for modern processors and FPGAs. |
| Output Accuracy | ±1% with remote sense - maintains tight regulation despite PCB ground bounce up to ±100mV. |
| Max Output Current | 15A - delivered continuously with thermal derating; supports parallel configuration for higher current. |
| Switching Frequency | Programmable 0.5–5MHz - balances size (small inductors/caps) vs efficiency (switching loss trade-off). |
| Min On-Time | 35ns - enables high VIN/VOUT ratios (e.g., 5V→1.2V at 2MHz) without pulse skipping. |
| Shutdown Current | 1µA - preserves battery life in always-on subsystems. |
| Enable Threshold | Precision 400mV with 60mV hysteresis - allows accurate power sequencing with external resistor dividers. |
Pinout & Package
Package: 18-pin 3mm × 3mm × 0.95mm LQFN with exposed PGND pad (Pin 19), θJA = 39.6°C/W, requiring soldering of exposed pad to PCB ground plane for thermal and EMI performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (1) | Enable control input | Active-high with precision 400mV threshold and hysteresis; direct tie to VIN or resistor divider for sequenced startup. |
| AGND (2) | Remote sense ground | Kelvin connection point for FB divider low-side; referenced to load ground to cancel IR drop errors. |
| VIN (3,4,11,12) | Main power input | Four parallel pins reduce impedance and AC loop area; must be shorted and bypassed locally to PGND. |
| PGND (5,10,19) | Power ground return | Three dedicated pins + exposed pad form primary thermal path and low-inductance bottom-switch return. |
| SW (6–9) | Switch node outputs | Four paralleled SW pins connect directly to inductor; minimize trace inductance to reduce ringing and EMI. |
| MODE/SYNC (13) | Mode control & clock I/O | Configures pulse-skip/forced-continuous mode or accepts/sends sync clock (0.5–2.25MHz) for multi-phase coordination. |
| PGOOD (14) | Power status indicator | Open-drain output asserting when VOUT is within ±3% of target; supports wired-OR across parallel phases. |
| RT (15) | Oscillator programming | Resistor-to-AGND sets frequency (e.g., 274kΩ = 2MHz); also used for phase offset in multiphase setups. |
| SSTT (16) | Soft-start/track/temp monitor | Charges external cap for controlled ramp-up; tracks FB during start; settles to 4mV/°C voltage post-start for die temp readback. |
| ITH (17) | Loop compensation node | Connects RC network to AGND for Type II/III compensation; sets bandwidth and transient response. |
| FB (18) | Feedback input | Regulated to 500mV; connects to resistor divider from VOUT; phase-lead cap to VOUT improves stability. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® Architecture | Reduces radiated EMI by >20dB vs conventional buck converters, enabling compliance with CISPR 22 Class B without shielding. |
| Ultralow Minimum On-Time (35ns) | Permits high-frequency operation at high VIN/VOUT ratios (e.g., 5V→1.2V @ 2MHz) while maintaining PWM control. |
| Integrated Power MOSFETs | 3mΩ NMOS and 8mΩ PMOS switches enable >90% efficiency at 15A (3.3V→1.2V, 2MHz) with minimal external components. |
| Configurable Multiphase Support | Enables seamless paralleling of multiple LTC3313EV#TRPBF units via MODE/SYNC pin phasing for >15A applications. |
| Dual Protection Scheme | Peak current limit (18–24A) + valley current limit (15–19A) prevents inductor saturation and ensures safe overload recovery. |
| AEC-Q100 Qualified | Rated for automotive temperature range (–40°C to 125°C junction), supporting infotainment, ADAS, and body electronics. |
Applications
| FPGA Core Supply | Automotive Infotainment SoC |
|---|---|
Use Scenario: Powering Xilinx Versal or Intel Agilex FPGA core rails requiring fast transient response and tight voltage tolerance. IC Role / Device Role / Timing Role: Primary 1.2V/15A POL regulator with remote sensing and soft-start tracking for supply sequencing with I/O banks. Use Value: 35ns min on-time and 500mV reference ensure stable 1.2V under dynamic load steps up to 7.5A/µs without droop or overshoot. | Use Scenario: Delivering 1.0V/12A to Qualcomm SA8155P or NXP i.MX8 SoC in head unit designs with strict EMC limits. IC Role / Device Role / Timing Role: AEC-Q100-compliant buck converter with SYNC input to align switching edges with system clock and reduce beat frequencies. Use Value: Silent Switcher® architecture meets CISPR 25 Class 5 radiated emissions limits without ferrite beads or metal shields. |
| Server DDR5 Memory VDDQ | Industrial PLC CPU Core |
Use Scenario: Providing 1.25V/10A to DDR5 memory modules in edge server platforms with high-density PCB layouts. IC Role / Device Role / Timing Role: High-efficiency, low-noise step-down regulator with PGOOD signaling for memory initialization sequence validation. Use Value: ±1% remote-sense accuracy maintains VDDQ within JEDEC spec across 100mV ground shift between controller and DIMM. | Use Scenario: Generating 0.85V/8A for ARM Cortex-A72 cores in ruggedized industrial controllers operating at –40°C to 85°C ambient. IC Role / Device Role / Timing Role: Robust POL converter with thermal shutdown, overvoltage protection, and die temperature monitoring via SSTT pin. Use Value: Die temperature readback (4mV/°C) enables predictive thermal throttling before junction exceeds 125°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-current synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2965GQ-Z (Monolithic Power) | 4.5V–16V input, 70A max with external drivers; no integrated 15A switch; requires external gate drivers and current sense. | Targeted at higher-power (>30A) server VRMs; lacks Silent Switcher EMI performance and 35ns min on-time. | Select MP2965GQ-Z only when scaling beyond 15A or requiring >12V input; LTC3313EV#TRPBF offers simpler layout and lower EMI for ≤15A POL. |
| TPS546D24RQF (Texas Instruments) | 2.9V–16V input, 60A scalable via UCD7242 drivers; includes PMBus interface; no integrated 15A switch. | Designed for digital power management in data center VRMs; adds telemetry but increases BOM count and layout complexity. | Choose TPS546D24RQF for PMBus-configurable, multi-rail systems needing telemetry; LTC3313EV#TRPBF delivers faster time-to-market for analog-controlled 15A POL. |
Compared with MP2965GQ-Z and TPS546D24RQF, the LTC3313EV#TRPBF provides fully integrated 15A operation in a compact 3mm × 3mm footprint, superior EMI performance via Silent Switcher®, and analog simplicity-making it optimal for space-constrained, noise-sensitive FPGA/SoC core supplies where digital control is unnecessary.
Availability
LTC3313EV#TRPBF is available at Aetrix Electronics and suitable for FPGA core supplies, automotive infotainment SoCs, and industrial PLC CPU power delivery requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LTC3313EV#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, communications, and power management markets.
The LTC3313EV#TRPBF belongs to the Silent Switcher® family of high-efficiency, low-EMI DC/DC regulators designed specifically for noise-sensitive applications including automotive ADAS, FPGA/ASIC core power, and high-density server POL systems.
FAQ
What is the maximum supported switching frequency for LTC3313EV#TRPBF?
The LTC3313EV#TRPBF supports a programmable switching frequency up to 5MHz using an external RT resistor. At 5MHz, the minimum achievable output voltage depends on input voltage and minimum on-time (35ns); for example, with VIN = 5V, VOUT ≥ ~1.75V is practical. The default unsynchronized frequency is 2MHz with RT = 274kΩ.
How does LTC3313EV#TRPBF achieve ultralow EMI performance?
The LTC3313EV#TRPBF achieves ultralow EMI through Silent Switcher® 1 architecture: symmetric internal power loops, dual VIN/PGND pin pairs, and optimized bond wire layout minimize magnetic field coupling. Combined with proper PCB layout (tight input cap placement, exposed pad soldering), it meets CISPR 22 Class B without shielding.
Can LTC3313EV#TRPBF operate in 100% duty cycle mode?
Yes, the LTC3313EV#TRPBF supports true 100% duty cycle operation, enabling dropout mode when VIN approaches VOUT. In this mode, output voltage equals VIN minus the IR drop across the internal PMOS switch (RDS(ON) ≈ 8mΩ) and inductor DCR, allowing operation down to VIN = VOUT + (ILoad × RDS(ON)).
What is the function of the SSTT pin on LTC3313EV#TRPBF?
The SSTT pin on LTC3313EV#TRPBF serves three functions: (1) soft-start capacitor connection for controlled VOUT ramp-up, (2) tracking input that mirrors FB voltage during startup, and (3) post-start die temperature monitor output (4mV/°C). During faults, it pulls low to initiate recovery soft-start.
Is LTC3313EV#TRPBF pin-compatible with other devices in the LTC3310/LTC3311 family?
No, LTC3313EV#TRPBF is not pin-compatible with LTC3310 or LTC3311. While it shares layout compatibility (same 3mm × 3mm LQFN footprint and thermal pad), pin assignments differ significantly-e.g., LTC3313 has four SW pins and dedicated AGND, whereas LTC3311 uses different pinout and lacks SSTT/ITH functionality.
LTC3313EV#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 18-PowerTFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.25V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.5V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 15A
- Frequency - Switching:
- 500kHz ~ 5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 18-LQFN (3x3)
LTC3313EV#TRPBF FAQ
1.How can I place an order for LTC3313EV#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3313EV#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 LTC3313EV#TRPBF reliable?
The price and inventory of LTC3313EV#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3313EV#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3313EV#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3313EV#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3313EV#TRPBF?
LTC3313EV#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3313EV#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 LTC3313EV#TRPBF?
For technical support, including LTC3313EV#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3313EV#TRPBF requirements.
6.How does Aetrix verify that LTC3313EV#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3313EV#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 LTC3313EV#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3313EV#TRPBF?
All LTC3313EV#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3313EV#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 LTC3313EV#TRPBF part is unused and in its original packaging.
Return procedure for LTC3313EV#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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