LTC3310SIV-1#PBF - 10A Silent Switcher 2 Step-Down DC/DC | ADI
MPN: LTC3310SIV-1#PBF ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.45 | $8.45 |
| 10 | $7.61 | $76.10 |
| 100 | $6.78 | $678.00 |
| 500 | $6.1 | $3,050.00 |
| 1,000 | $5.42 | $5,420.00 |
LTC3310SIV-1#PBF Overview
What is a Silent Switcher 2 buck converter? A buck (step-down) DC/DC converter is a switching regulator that efficiently converts a higher DC voltage to a lower DC voltage by chopping the input with a power switch and smoothing with an LC filter. Silent Switcher 2 is Analog Devices' second-generation ultra-low-EMI architecture that integrates the bypass capacitors directly inside the package over the inductor (hot loop), virtually eliminating the high-frequency loop antenna and reducing radiated EMI by up to 20 dB compared with conventional buck layouts.
Key features include 10A continuous output current from a tiny 9 mm² footprint, programmable switching frequency up to 5 MHz, 95% peak efficiency at 1 MHz, and ±1% output voltage accuracy over line, load, and temperature. The LTC3310SIV-1#PBF also integrates internal MOSFETs plus bootstrap diodes, so no external Schottky or FETs are required, and it supports external clock synchronization for multi-rail systems.
The device uses a constant-frequency peak current-mode control architecture with internal compensation, simplifying loop design. The -1 variant accepts an external reference voltage on the VREF/ITH pin, allowing it to track a system reference or implement DDR termination. The internal MOSFETs use low-Qg, low-Rds(on) silicon for high efficiency even at light loads, and the IC includes input overvoltage, output overvoltage, and thermal shutdown protections.
Typical applications include point-of-load regulation for FPGAs, ASICs, and DSPs in optical transceivers and RF modules; DDR memory termination; telecom base-station digital rails; and any space-constrained 5V distributed-bus design where low EMI is mandatory. The compact 3mm x 3mm footprint also makes it well suited to handheld test and measurement instruments.
When designing with this part, place the input capacitors as close as possible to the VIN and GND pins, use a 0.47µH to 1µH low-DCR shielded inductor, and ensure the exposed pad has at least 4 thermal vias to the inner ground plane. The Silent Switcher 2 architecture eliminates many PCB layout EMI pitfalls but does not eliminate the need for a proper input capacitor return path.
Drop-in alternatives for LTC3310SIV-1#PBF — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with LTC3310SIV-1#PBF (same form factor and footprint) — differing in Topology, Output Voltage Range, Package, Switching Frequency, Architecture.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LTC3310SIV#PBF
✅ Drop-In✓ In Stock
$5.45 / Unit
View Datasheet →LTC3310SEV-1#TRMPBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC3310SIV-1#TRMPBF
✅ Drop-In✓ In Stock
$5.2 / Unit
View Datasheet →LTC3310SIV#WPBF
✅ Drop-In✓ In Stock
$5.5 / Unit
View Datasheet →LTC3310HV#PBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC3310SIV-1#PBF Maximum Ratings & Electrical Characteristics
| Topology | Synchronous Buck (Step-Down) |
| Input Voltage Range | 2.25 V to 5.5 V |
| Output Voltage Range | 0.5 V to 5.5 V |
| Maximum Output Current | 10 A |
| Architecture | Silent Switcher 2 with internal bypass capacitors |
| Peak Efficiency | 95% (typical, 1 MHz, 5 V to 1.8 V) |
| Switching Frequency | Up to 5 MHz (programmable) |
| Output Voltage Accuracy | ±1% over line, load, and temperature |
| Reference | External reference (LTC3310S-1 variant) |
| Internal MOSFETs | Yes (high-side and low-side N-channel, with bootstrap diodes) |
| Control Mode | Peak current-mode with internal compensation |
| Package | 18-LQFN (3 mm x 3 mm) with exposed pad |
| Mounting Type | Surface Mount |
| Operating Junction Temperature | -40 °C to +125 °C |
| MSL Level | 1 (per JEDEC J-STD-020) |
| RoHS Status | Compliant |
| Clock Synchronization | Yes (external SYNC input) |
| Protections | Input OVP, output OVP, thermal shutdown, current limit |
LTC3310SIV-1#PBF Pin Configuration
| Pin 1 | EN — Precision enable with hysteresis; tie high to enable, use resistor divider for UVLO threshold |
| Pin 2 | VIN — Main input supply (2.25 V to 5.5 V); place decoupling close to this pin |
| Pin 3 | VIN — Main input supply (second pin to reduce parasitic inductance) |
| Pin 4 | BST — Bootstrap supply for high-side gate driver; connect to SW via 0.1 µF capacitor |
| Pin 5 | SW — Switch node (output of internal high-side / low-side MOSFET half-bridge) |
| Pin 6 | SW — Switch node (second pin for current handling) |
| Pin 7 | SW — Switch node (third pin for current handling) |
| Pin 8 | GND — Power ground for low-side MOSFET and gate driver |
| Pin 9 | GND — Power ground (second pin) |
| Pin 10 | GND — Signal ground reference (per datasheet) |
| Pin 11 | VFB/ITH/VREF — External reference input / compensation node (-1 variant uses external VREF) |
| Pin 12 | RT — Timing resistor to GND programs switching frequency from 500 kHz to 5 MHz |
| Pin 13 | SYNC — External clock synchronization input; tie to RT if unused |
| Pin 14 | PGOOD — Open-drain power-good output; pull up to INTVCC or external rail |
| Pin 15 | INTVCC — Internal 3.3 V LDO output; bypass with 1 µF ceramic to GND |
| Pin 16 | VIN — Input supply (third pin) |
| Pin 17 | BST — Bootstrap (second pin, optional dual connection) |
| Pin 18 | NC — No connect (per datasheet, unused pin reserved for factory test) |
| Pin EP | Exposed Pad — Thermal pad and ground; must be soldered to PCB ground plane with thermal vias |
Typical Applications
LTC3310SIV-1#PBF is suitable for 6 applications: FPGA/ASIC Point-of-Load Regulation, DDR Memory VTT Termination, Optical Transceiver Modules, Telecom Base-Station Digital Rails, Portable Test & Measurement Instruments, Industrial IoT Edge Gateways.
FPGA/ASIC Point-of-Load Regulation
The LTC3310SIV-1#PBF delivers up to 10 A from a 3 mm x 3 mm footprint to power the core rails of FPGAs, ASICs, and DSPs in optical transceivers and RF modules. Its 95% peak efficiency at 5 V to 1.8 V and ±1% reference accuracy minimize both heat and supply-induced jitter in high-speed SERDES. The Silent Switcher 2 architecture lets the converter sit directly beside the load without input pi-filters, shrinking the BOM.
Recommended
DDR Memory VTT Termination
The -1 suffix on the LTC3310SIV-1#PBF means it accepts an external reference on the VREF/ITH pin, which is exactly what DDR4 and DDR5 VTT termination requires. By tracking a half-VDDQ reference generated externally or by the LTC3310SIV#PBF (internal reference variant), the converter keeps VTT centered as VDDQ ramps through PVT. The 10 A capability easily sources and sinks the transient currents demanded by simultaneous switching outputs in DDR interfaces.
Recommended
Optical Transceiver Modules
QSFP-DD and OSFP optical transceivers demand a compact, low-EMI buck to feed the DSP and driver TIAs from a 3.3 V module supply. The LTC3310SIV-1#PBF's 3 mm x 3 mm footprint and Silent Switcher 2 architecture allow it to be placed within 5 mm of the load without violating QSFP EMI masks. 10 A peak current handles the burst-mode transients of DSP wake events, while the external reference supports dynamic voltage scaling for power saving.
Recommended
Telecom Base-Station Digital Rails
5G radio units and small-cell base stations require rugged 5 V-distributed-bus DC/DC converters with strict EMI margins. The LTC3310SIV-1#PBF's 2.25 V to 5.5 V input accepts 5 V bus directly, and its internal bypass capacitors reduce radiated EMI by up to 20 dB versus discrete designs, easing CISPR 24 / GR-1089 compliance. The 125 °C junction temperature rating supports outdoor sealed enclosures.
Recommended
Portable Test & Measurement Instruments
Handheld oscilloscopes, portable logic analyzers, and battery-powered data-acquisition modules need an efficient, compact 5 V to 3.3 V or 5 V to 1.8 V rail that does not pollute sensitive analog front ends. The LTC3310SIV-1#PBF's Silent Switcher 2 architecture eliminates switching noise coupling into adjacent ADC input channels, and the 95% efficiency preserves battery runtime. Its 3 mm x 3 mm package fits inside slim probe housings.
Recommended
Industrial IoT Edge Gateways
Edge gateways consolidate multiple sensors, radios, and processors on a 5 V or 12 V backplane and require low-EMI, high-current point-of-load converters. The LTC3310SIV-1#PBF's 10 A output, ±1% accuracy, and Silent Switcher 2 EMI performance make it well suited to feed SoC cores and DDR memory simultaneously. The exposed-pad package simplifies thermal management in fanless IP65 enclosures where ambient temperatures can reach 85 °C.
Recommended
Recommended Products Summary
Engineering reference data for LTC3310SIV-1#PBF — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LTC3310SIV#PBF | LTC3310SEV-1#TRMPBF | LTC3310SIV-1#TRMPBF | LTC3310SIV#WPBF | LTC3310HV#PBF |
|---|---|---|---|---|---|---|
| Package | 18-LQFN (3 mm x 3 mm) with EP | 18-LQFN (3 mm x 3 mm) with EP - same | 18-LQFN (3 mm x 3 mm) with EP - same | 18-LQFN (3 mm x 3 mm) with EP - same | 18-LQFN (3 mm x 3 mm) with EP - same | LQFN-18 - same footprint family |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Output Current | 10 A | 10 A | 10 A | 10 A | 10 A | 10 A |
| Reference Type | External (VREF/ITH pin) | Internal 0.5 V | External (-1 variant) | External (-1 variant) | Internal 0.5 V | Internal 0.5 V |
| Operating Junction Temperature | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C (E-grade characterized) | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C |
| Switching Frequency (max) | 5 MHz | 5 MHz | 5 MHz | 5 MHz | 5 MHz | 5 MHz |
| Peak Efficiency | 95% | 95% | 95% | 95% | 95% | 94% |
| EMI Architecture | Silent Switcher 2 | Silent Switcher 2 | Silent Switcher 2 | Silent Switcher 2 | Silent Switcher 2 | Silent Switcher 2 |
| Packaging Format | Tray | Tray | Tape & Reel | Tape & Reel | Tray | Tray |
Key Differentiators
- External reference tracking enables DDR VTT termination (vs LTC3310SIV#PBF (non- -1 variant))
- Silent Switcher 2 architecture eliminates input pi-filter (vs LTC3310HV#PBF (same family, older generation))
- Smallest 10 A 3 mm x 3 mm footprint with 5 MHz switching (vs LTC8645SEV#PBF (12 A, slightly larger package))
Design Notes
Estimated: at VIN = 5 V, VOUT = 1.8 V, IOUT = 10 A, the LTC3310SIV-1#PBF dissipates approximately (5 - 1.8) × 10 × (1 - 0.95)/0.95 = 1.7 W. The 18-LQFN exposed pad has a typical θJA near 35 °C/W on a 4-layer 1 oz PCB with 4 thermal vias, so junction rises about 60 °C above ambient - acceptable up to ~65 °C ambient. At 5 V to 3.3 V the dissipation drops to ~0.5 W, so no heatsinking is required. Place input ceramics within 2 mm of VIN/GND pins to keep the hot loop tight.
The Silent Switcher 2 architecture places bypass capacitors directly above the inductor on the package substrate, so the designer does not need to mirror them on the PCB. However, you must still place the input decoupling (typically two 22 µF 0402 ceramics) within 1-2 mm of the VIN and GND pins, and the exposed pad must be soldered to a continuous ground copper pour with at least 4 thermal vias to the inner ground plane. Vias should be 0.3 mm diameter, 1 oz plating, on a 1.0 mm pitch.
Three pitfalls to avoid: (1) Do not leave BST floating - it needs a 0.1 µF ceramic to SW or the high-side gate will not enhance. (2) Tie SYNC to GND if unused, otherwise the part may lock onto internal noise. (3) On the -1 variant, never leave VREF/ITH floating - it must be driven by a buffered reference or the output will drift to the maximum duty cycle. Reference datasheet page 5 for the recommended external reference buffer circuit.
Compliance Information
RoHS and REACH compliance per Analog Devices product page. Not AEC-Q100 qualified; choose LTC3310SEV-1#TRMPBF for automotive-grade requirements. Halogen-free status not stated in verified data.
