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Analog Devices Inc. LTC3310SIV#PBF
- Part No.:
- LTC3310SIV#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 18-TFQFN Exposed Pad
- Datasheet:
-
LTC3310SIV#PBF.pdf
- Description:
- IC REG BUCK ADJ 10A 18LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,343
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Product details
Overview
LTC3310SIV#PBF from Analog Devices is a monolithic, Silent Switcher 2 synchronous step-down DC/DC converter delivering up to 10A output current from a 2.25V–5.5V input, featuring 500mV feedback reference, 35ns minimum on-time, and ±1% VOUT accuracy with remote sense. It operates in automotive-grade temperature range (–40°C to 125°C) and targets high-density POL applications such as FPGA core supplies.
For engineers reviewing the LTC3310SIV#PBF datasheet, LTC3310SIV#PBF pinout, LTC3310SIV#PBF application, or LTC3310SIV#PBF equivalent, key selection criteria include its 4.5mΩ NMOS / 16mΩ PMOS RDS(ON), programmable 0.5–5MHz switching frequency, integrated hot-loop bypass capacitors for EMI reduction, and support for multi-phase paralleling in high-power systems.
Technical Context
The LTC3310SIV#PBF employs constant-frequency peak current mode control with internal error amplifier transconductance of 400µS and 100% duty cycle capability for low-dropout operation. Its Silent Switcher 2 architecture integrates VIN-to-PGND and VIN-to-AGND bypass capacitors to minimize high-di/dt loop area and suppress radiated EMI without external components.
It supports three operating modes via MODE/SYNC pin: pulse-skipping for light-load efficiency, forced continuous conduction for low-noise regulation, and external clock synchronization with 0.5–2.25MHz input range. The device includes active voltage positioning only in -1 variants; LTC3310SIV#PBF uses adjustable output via external FB divider and does not implement AVP.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.25V to 5.5V - enables direct regulation from single-cell Li-ion, USB PD, or intermediate bus rails without pre-regulation. |
| VOUT Range | 0.5V to VIN - supports sub-1V FPGA/ASIC core supplies with precise 500mV reference and ±1% accuracy over temp/load. |
| Max Output Current | 10A - delivered continuously in thermally enhanced 3mm × 3mm LQFN package with θJCbottom = 9°C/W. |
| Switching Frequency | Programmable 0.5–5MHz via RT resistor - allows optimization of size vs. efficiency; default 2MHz at RT = 274kΩ. |
| Top/Bottom RDS(ON) | 4.5mΩ NMOS / 16mΩ PMOS - minimizes conduction loss at high load; verified across –40°C to 125°C junction range. |
| Min On-Time | 35ns - enables high step-down ratios (e.g., 5V→0.5V at 2MHz) without pulse skipping at light loads. |
| Shutdown Current | 1µA - ensures ultra-low system standby power in battery-backed or always-on applications. |
Pinout & Package
Package: 18-lead 3mm × 3mm LQFN with exposed PGND pad (Pin 19), rated for –40°C to 125°C operating junction temperature. Thermal resistance θJCbottom = 9°C/W; requires soldering exposed pad to PCB ground plane with ≥6 thermal vias.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (1) | Enable input with precision threshold | 400mV rising threshold with 60mV hysteresis; enables clean startup/shutdown sequencing and UVLO-independent control. |
| AGND (2) | Remote sense ground reference | Kelvin connection point for FB divider low-side; compensates for up to ±100mV PCB ground offset between IC and load. |
| VIN (3,4,11,12) | Main input power supply | Four parallel pins reduce trace inductance; must be shorted and bypassed locally to PGND with low-ESR ceramics. |
| PGND (5,10,19) | Power ground return path | Primary thermal path; Pin 19 is exposed pad - mandatory solder connection to PCB ground plane for thermal and EMI performance. |
| SW (6–9) | Switch node outputs | Four paralleled SW pins drive external inductor; require short, wide copper traces to minimize ringing and EMI. |
| MODE/SYNC (13) | Mode selection & clock interface | Configures pulse-skip/forced-CCM or synchronizes to external 0.5–2.25MHz clock; also outputs synchronized clock signal. |
| PGOOD (14) | Open-drain power-good indicator | Asserts high when VOUT is within 97–99% of regulation; 100µs delay filters transient dips; pulls low during fault/shutdown. |
| RT (15) | Oscillator frequency programming | Resistor to AGND sets fSW from 0.5–5MHz; also used for phase alignment in multi-phase configurations. |
| SSTT (16) | Soft-start, tracking, temperature monitor | 10µA current charges external capacitor for controlled VOUT ramp; transitions to die temperature readout (4mV/°C) post-startup. |
| ITH (17) | Current limit and loop compensation | Internal node for error amplifier output; connects to AGND via RC network to stabilize voltage loop and set current limit slope. |
| FB (18) | Feedback input for adjustable VOUT | Regulated to 500mV; connects to resistive divider from VOUT; supports remote sensing via AGND-referenced low-side resistor. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher 2 architecture | Integrated VIN–PGND and VIN–AGND bypass capacitors eliminate need for external hot-loop ceramics, reducing EMI by >30dB vs. SS1. |
| Fast transient response | Peak current mode control with 35ns min on-time and 400µS error amp transconductance enables <10µs recovery from 1A–9A load steps. |
| Thermally robust 3mm × 3mm LQFN | θJCbottom = 9°C/W enables 10A continuous operation at 125°C ambient with minimal heatsinking in 4-layer PCB designs. |
| Configurable multi-phase operation | MODE/SYNC pin supports master-slave phasing for two or more LTC3310S devices, enabling 20A+ scalable POL with interleaved ripple cancellation. |
| Comprehensive protection suite | Includes output overvoltage (106–112.5% VOUT), thermal shutdown, output short-circuit recovery via SSTT-triggered soft-start, and valley current limiting. |
Applications
| FPGA Core Supply | Automotive ADAS Domain Controller |
|---|---|
|
Use Scenario: Powering Xilinx Versal or Intel Agilex FPGA core rails requiring 0.75–1.2V @ 8–10A with tight voltage tolerance and fast load transient response. IC Role / Device Role / Timing Role: Primary synchronous buck regulator with remote sense, programmable frequency, and PGOOD monitoring for system power sequencing. Use Value: 35ns min on-time and 400µS error amp gain ensure <20mV droop during 5A/µs load steps; ±1% accuracy maintains FPGA timing margins. |
Use Scenario: Providing 1.0V core supply to NVIDIA Orin or TI Jacinto 7 SoCs in ISO 26262-compliant ADAS ECUs with AEC-Q100 Grade 1 qualification. IC Role / Device Role / Timing Role: Automotive-grade POL regulator with die temperature monitoring (via SSTT), robust EN threshold, and EMI-compliant Silent Switcher 2 layout. Use Value: –40°C to 125°C operation, 1µA shutdown current, and CISPR25 Class 5 radiated emissions compliance enable deployment in engine bay and radar modules. |
| Telecom Intermediate Bus Converter | Industrial PLC I/O Module |
|
Use Scenario: Converting 48V intermediate bus to 3.3V/5V for ASICs and SerDes in 5G base station radios with strict thermal and EMI constraints. IC Role / Device Role / Timing Role: High-efficiency, high-frequency buck stage operating at 3MHz to shrink magnetics and meet compact form factor requirements. Use Value: Programmable 0.5–5MHz switching enables optimal trade-off between efficiency (92% @ 10A, 3.3V→1.2V) and component size; 4.5mΩ NMOS reduces conduction loss at full load. |
Use Scenario: Delivering 1.8V/3.3V power to microcontrollers and isolated communication interfaces in DIN-rail mounted PLCs with wide input range and long service life. IC Role / Device Role / Timing Role: Industrial-grade DC/DC converter with 2.25V–5.5V input flexibility, remote sense for long PCB traces, and thermal monitoring for predictive maintenance. Use Value: AGND Kelvin sensing maintains ±1% output accuracy despite 50mV ground drop across backplane; SSTT pin provides real-time die temperature for firmware throttling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2964GQ-Z (Monolithic Power) | 4.5V–16V input, 6A max, 500kHz–1.1MHz fixed freq, no integrated hot-loop caps, QFN-14 | Higher VIN range but lower current; lacks Silent Switcher EMI suppression and remote sense; suited for non-EMI-critical industrial supplies. | Select MP2964GQ-Z only if input exceeds 5.5V or board space permits larger inductors; avoid where CISPR25 compliance or sub-1V accuracy is required. |
| TPS546D24RQF (Texas Instruments) | 4.5V–18V input, 10A, 300kHz–1.5MHz, PMBus interface, 40-pin QFN, no integrated bypass caps | Supports digital control and telemetry but requires external EMI filtering; larger footprint and higher BOM count than LTC3310SIV#PBF. | Choose TPS546D24RQF when telemetry, margining, or dynamic voltage scaling via PMBus is essential; LTC3310SIV#PBF preferred for analog simplicity and EMI-sensitive layouts. |
Compared with MP2964GQ-Z and TPS546D24RQF, the LTC3310SIV#PBF delivers superior EMI performance via integrated Silent Switcher 2 capacitors, tighter output accuracy (±1% vs. ±1.5%), and smaller 3mm × 3mm footprint - making it optimal for space-constrained, noise-sensitive POL applications where analog control suffices.
Availability
LTC3310SIV#PBF is available at Aetrix Electronics and suitable for FPGA core supplies, automotive ADAS domain controllers, and telecom intermediate bus converters requiring stable component supply, AEC-Q100 qualification, and long-term production continuity.
Supply support for LTC3310SIV#PBF 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 industrial markets since 1965.
The LTC3310S series belongs to Analog Devices' Power by Linear™ portfolio, designed specifically for high-efficiency, low-EMI point-of-load regulation in space-constrained, thermally demanding applications including automotive, datacom, and computing systems.
FAQ
What is the maximum output current capability of the LTC3310SIV#PBF under continuous operation?
The LTC3310SIV#PBF delivers up to 10A of continuous output current when implemented with proper thermal design - including soldering the exposed PGND pad to a 4-layer PCB with ≥6 thermal vias and using low-ESR input/output capacitors. Derating applies above 85°C ambient; full 10A is validated at 125°C junction temperature per datasheet Rev. F specifications.
Does the LTC3310SIV#PBF support remote voltage sensing, and how is it implemented?
Yes, the LTC3310SIV#PBF supports true remote voltage sensing via its dedicated AGND pin (Pin 2). The low-side resistor of the FB divider must connect directly to AGND - not PGND - and AGND should be routed as a Kelvin sense line to the load's ground return point. This compensates for up to ±100mV PCB ground potential difference, ensuring ±1% VOUT accuracy at the load.
How does the Silent Switcher 2 architecture in the LTC3310SIV#PBF reduce EMI compared to standard buck converters?
The LTC3310SIV#PBF integrates internal bypass capacitors between VIN–PGND and VIN–AGND, minimizing high-di/dt loop area and eliminating discrete ceramic placement errors. Combined with symmetrical SW pin layout and matched internal switch routing, this achieves >30dB lower radiated emissions than Silent Switcher 1 parts - meeting CISPR25 Class 5 limits without external EMI filters in typical 2-layer demo layouts.
Can the LTC3310SIV#PBF be synchronized to an external clock, and what is the supported frequency range?
Yes, the LTC3310SIV#PBF supports external clock synchronization via the MODE/SYNC pin (Pin 13). It accepts square-wave inputs from 0.5MHz to 2.25MHz, locking its internal oscillator via PLL. During sync, it operates in pulse-skip mode and automatically adapts slope compensation. The pin also outputs a synchronized clock signal for multi-phase coordination.
What thermal protection features are built into the LTC3310SIV#PBF?
The LTC3310SIV#PBF includes overtemperature protection that activates above 150°C junction temperature, temporarily halting switching to prevent damage. It also provides real-time die temperature monitoring via the SSTT pin (4mV/°C output), enabling firmware-based thermal throttling. Thermal shutdown is latched and requires EN cycling to reset.
LTC3310SIV#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- Silent Switcher®2
- Package/Case:
- 18-TFQFN Exposed Pad
- Packaging:
- Tray
- 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:
- 10A
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 18-LQFN (3x3)
LTC3310SIV#PBF FAQ
1.How can I place an order for LTC3310SIV#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3310SIV#PBF 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 LTC3310SIV#PBF reliable?
The price and inventory of LTC3310SIV#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3310SIV#PBF is usually 5 days.
3.What payment methods are accepted for LTC3310SIV#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3310SIV#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3310SIV#PBF?
LTC3310SIV#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3310SIV#PBF 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 LTC3310SIV#PBF?
For technical support, including LTC3310SIV#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3310SIV#PBF requirements.
6.How does Aetrix verify that LTC3310SIV#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3310SIV#PBF 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 LTC3310SIV#PBF meets industry standards.
7.What is the process for return or replacement of LTC3310SIV#PBF?
All LTC3310SIV#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3310SIV#PBF, 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 LTC3310SIV#PBF part is unused and in its original packaging.
Return procedure for LTC3310SIV#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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