LTC3310SIV-1#TRMPBF - 10A, 5.5V Sync Step-Down Silent Switcher 2 | ADI
MPN: LTC3310SIV-1#TRMPBF ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $9.32 | $9.32 |
| 10 | $8.41 | $84.10 |
| 100 | $7.1 | $710.00 |
| 500 | $5.98 | $2,990.00 |
| 1,000 | $5.2 | $5,200.00 |
LTC3310SIV-1#TRMPBF Overview
What is a synchronous buck converter? A synchronous buck (step-down) DC/DC converter is a switching regulator that uses two MOSFETs - one high-side and one low-side - to convert a higher DC input voltage into a lower DC output voltage with very high efficiency. Compared to a non-synchronous buck that uses a diode for the low-side path, synchronous designs replace the diode with a MOSFET, eliminating the diode forward drop and pushing peak efficiencies above 95%. Buck converters sit within the broader hierarchy of voltage regulators -> DC-DC converters -> power management ICs -> power semiconductors, and are the workhorse topology for point-of-load conversion in nearly every digital system.
Key features include 10 A continuous output current, sub-1 uA quiescent current in Burst Mode operation, fixed 1 V output (LTC3310SIV-1 variant), internal compensation, and a programmable switching frequency up to 5 MHz. The Silent Switcher 2 architecture also enables clean switching edges that easily meet CISPR 25 Class 5 automotive EMI limits, even with a 2-layer PCB.
The LTC3310S architecture integrates the top and bottom power MOSFETs, the bootstrap capacitor, and hot-loop bypass capacitors inside the package, dramatically shrinking the external component count. The IV (industrial, 3 mm x 3 mm LQFN) package delivers thermally efficient power handling - typical applications sustain 10 A continuously with proper PCB copper area and no external heatsink.
Typical applications include automotive infotainment and ADAS point-of-load rails, FPGA/ASIC/SoC core and I/O supplies, optical transceiver modules, high-current serial bus power (PCIe, multi-gigabit transceivers), and post-regulation stages following a 5 V or 3.3 V system rail.
When designing with this device, prioritize a low-impedance ground plane and follow the reference PCB layout in the manufacturer datasheet exactly - Silent Switcher 2 is sensitive to high-frequency loop inductance. For light-load efficiency, enable Burst Mode; for lowest output ripple, select forced-continuous mode.
Drop-in alternatives for LTC3310SIV-1#TRMPBF — 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#TRMPBF (same form factor and footprint) — differing in Package, Topology, RoHS Status, Architecture, Operating Temperature Range.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LTC3310SIV#TRMPBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC3310SIV-1#PBF
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$5.42 / Unit
View Datasheet →LTC3310SEV-1#TRMPBF
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
LTC3310SIV#WTRMPBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC3310SIV#WPBF
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$5.5 / Unit
View Datasheet →LTC3310SIV-1#TRMPBF Maximum Ratings & Electrical Characteristics
| Topology | Synchronous Step-Down (Buck) DC/DC Converter |
| Input Voltage Range | 2.25 V to 5.5 V |
| Output Voltage (LTC3310SIV-1) | 1 V fixed |
| Maximum Output Current | 10 A |
| Switching Architecture | Silent Switcher 2 with internal hot-loop bypass |
| Maximum Switching Frequency | 5 MHz (programmable) |
| Quiescent Current (Burst Mode) | < 1 uA typical |
| Operating Temperature Range | -40 C to +125 C |
| Package | 18-lead LQFN, 3 mm x 3 mm, exposed pad (IV suffix) |
| Mounting Type | Surface Mount |
| Enable Input | Yes (active-high, low-Iq shutdown when low) |
| Output Voltage Remote Sense | AGND pin (Pin 2) for Kelvin feedback |
| RoHS Status | Compliant (#TRMPBF suffix) |
| Operating Modes | Burst Mode / Forced-Continuous / Pulse-Skipping (selectable via MODE pin) |
LTC3310SIV-1#TRMPBF Pin Configuration
| Pin 1 | VIN — Input voltage supply; place 1 uF + 22 uF bypass close to pin |
| Pin 2 | AGND — Analog ground / remote-sense ground; connect to load ground and feedback divider bottom |
| Pin 3 | EN — Enable input; active-high, threshold ~0.9V, low-Iq shutdown when pulled low |
| Pin 4 | MODE — Operating mode select: Burst Mode / Pulse-Skipping / Forced-Continuous |
| Pin 5 | RT — Timing resistor to GND; sets switching frequency up to 5 MHz |
| Pin 6 | PGOOD — Power-good open-drain output; pull-up to logic rail |
| Pin 7 | FB — Feedback (LTC3310SIV-1 fixed 1V: connect to VOUT; adjustable: resistor divider) |
| Pin 8 | NC — Not connected (per datasheet) |
| Pin 9 | NC — Not connected (per datasheet) |
| Pin 10 | NC — Not connected (per datasheet) |
| Pin 11 | BST — Bootstrap for top-side gate drive; internal 100 nF bootstrap cap to SW |
| Pin 12 | SW — Switch node; connect to power inductor |
| Pin 13 | SW — Switch node (second bond pad for high current) |
| Pin 14 | GND — Power ground; exposed pad connection |
| Pin 15 | GND — Power ground |
| Pin 16 | VOUT — Output voltage sense; connect to output capacitor |
| Pin 17 | VOUT — Output voltage sense (second bond pad) |
| Pin 18 | VIN — Input voltage supply (second bond pad) |
| Pin 21 | EP (Exposed Pad) — Thermal pad; must be soldered to GND plane for thermal dissipation |
Typical Applications
LTC3310SIV-1#TRMPBF is suitable for 7 applications: Automotive Infotainment Point-of-Load, FPGA / ASIC Core and I/O Voltage Rails, Optical Transceiver and Networking Module Power, Industrial 24V / 5V Post-Regulation, Server / Datacenter Point-of-Load, PCIe and Multi-Gigabit Transceiver Power, Portable / Battery-Powered Equipment.
Automotive Infotainment Point-of-Load
The LTC3310SIV-1#TRMPBF delivers up to 10 A to SoC core rails in automotive infotainment head units, where CISPR 25 Class 5 EMI compliance and small PCB area are non-negotiable. Silent Switcher 2 with integrated hot-loop bypass eliminates EMI shielding cans that would otherwise occupy precious 3 mm of head-unit PCB real estate. At 5 V input and 1 V output, peak efficiency above 90% keeps thermal rise below 40 C on a 1 sq inch copper pour, supporting the 105 C ambient automotive cabin environment.
Recommended
FPGA / ASIC Core and I/O Voltage Rails
High-performance FPGAs and ASICs require tightly regulated 1.0 V core rails at 5-10 A with sub-2% tolerance and <5 mV peak-to-peak ripple. The LTC3310SIV-1#TRMPBF fixed 1.0 V output eliminates external feedback resistor tolerance error, while its 5 MHz switching frequency keeps ripple below 10 mV with a single 22 uF ceramic output capacitor. The exposed thermal pad of the 18-LQFN (IV, 3x3 mm) package spreads heat efficiently, enabling the converter to deliver full 10 A continuously under FPGA burst-compute workloads.
Recommended
Optical Transceiver and Networking Module Power
QSFP28, SFP+, and other optical transceiver modules demand low-noise 1.0 V rails at 3-6 A per channel with tight ripple to preserve signal integrity. The LTC3310SIV-1#TRMPBF Silent Switcher 2 architecture produces low EMI that meets the IEEE 802.3 conducted emissions limits without external filtering, and its fixed 1.0 V output matches the typical Vcc rail of coherent optical DSPs and CDR chips. The 3 mm x 3 mm LQFN package fits within the compact module cages used in 1U/2U network switches.
Recommended
Industrial 24V / 5V Post-Regulation
In industrial PLCs and factory automation controllers, an isolated 5 V bus typically feeds downstream point-of-load converters that step down to 1.0 V for DSPs or microcontrollers. The LTC3310SIV-1#TRMPBF accepts 5 V input directly and delivers 10 A at fixed 1.0 V with >92% efficiency, eliminating the need for a second-stage LDO. The industrial -40 C to +125 C operating range handles cabinet temperatures adjacent to motor drivers and solenoid coils.
Recommended
Server / Datacenter Point-of-Load
Datacenter motherboards use multi-phase VRMs to deliver 50-200 A to high-core-count CPUs, but secondary chip-set rails (PCH, BMC, memory buffer) need only 5-10 A at 1.0 V or 0.9 V. The LTC3310SIV-1#TRMPBF fits this slot, providing a single-chip solution with 5 MHz switching that keeps the output filter below 1 mm in height for stacked DIMM-area real estate. Silent Switcher 2 ensures no EMI coupling into adjacent high-speed SERDES lanes.
Recommended
PCIe and Multi-Gigabit Transceiver Power
PCIe Gen 5/6 transceivers require clean 1.0 V analog supplies with sub-1 mV noise below 100 kHz to preserve eye-mask margin. The LTC3310SIV-1#TRMPBF Silent Switcher 2 architecture combined with optional forced-continuous PWM mode keeps switching noise outside the transceiver signal band. Fixed 1.0 V output eliminates feedback resistor noise injection. The 18-LQFN IV package fits between PCIe retimer chip and connector on dense server add-in cards.
Recommended
Portable / Battery-Powered Equipment
Handheld test instruments, medical wearables, and battery-powered industrial scanners operate from single-cell Li-ion (3.0 V to 4.2 V) and require high-efficiency step-down conversion to 1.0 V or 1.2 V rails. The LTC3310SIV-1#TRMPBF fixed 1.0 V output and <1 uA Burst Mode quiescent current extend battery life by >20% compared to non-synchronous buck designs. The 3 mm x 3 mm LQFN footprint occupies minimal board area inside compact handheld enclosures.
Recommended
Recommended Products Summary
Engineering reference data for LTC3310SIV-1#TRMPBF — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LTC3310SIV#TRMPBF | LTC3310SIV-1#PBF | LTC3310SEV-1#TRMPBF | LTC3310SIV#WTRMPBF | LTC3310SIV#WPBF |
|---|---|---|---|---|---|---|
| Package | 18-LQFN (IV, 3x3 mm) | 18-LQFN (IV, 3x3 mm) - same | 18-LQFN (IV, 3x3 mm) - same | 18-LQFN (EV, 5x5 mm) | 18-LQFN (IV, 3x3 mm) - same | 18-LQFN (IV, 3x3 mm) - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Output Voltage | 1.0 V fixed | 0.5 V to 5.5 V adjustable | 1.0 V fixed | 1.0 V fixed | 0.5 V to 5.5 V adjustable | 0.5 V to 5.5 V adjustable |
| Output Current | 10 A | 10 A | 10 A | 10 A | 10 A | 10 A |
| Input Voltage Range | 2.25 V to 5.5 V | 2.25 V to 5.5 V | 2.25 V to 5.5 V | 2.25 V to 5.5 V | 2.25 V to 5.5 V | 2.25 V to 5.5 V |
| Silent Switcher 2 | Yes | Yes | Yes | Yes | Yes | Yes |
| Automotive Grade (AEC-Q100) | No | No | No | No | Yes (W suffix) | Yes (W suffix) |
| Max Switching Frequency | 5 MHz | 5 MHz | 5 MHz | 5 MHz | 5 MHz | 5 MHz |
Key Differentiators
- Silent Switcher 2 with integrated hot-loop bypass capacitors (vs LTC3310 (non-S) version)
- Fixed 1.0 V output eliminates feedback resistors (vs LTC3310SIV#TRMPBF (adjustable))
- 18-LQFN IV package with 3 mm x 3 mm footprint (vs LTC3310SEV-1 (5x5 mm EV package))
Design Notes
Estimated: Silent Switcher 2 relies on internal hot-loop bypass capacitors, but the external power inductor, input capacitors, and output capacitors must still be placed close to the SW, VIN, and VOUT pins respectively. The recommended PCB layout in the datasheet places two 22 uF 0805 ceramic input capacitors within 1 mm of the VIN pads, and the power inductor within 3 mm of the SW pad. Use a single uninterrupted ground plane on layer 2, with the exposed pad of the LQFN stitched to the ground plane with at least 9 thermal vias (0.3 mm drill, 0.5 mm pitch).
Estimated: at VIN = 5 V, VOUT = 1.0 V, IOUT = 10 A continuous, and ~92% peak efficiency, power dissipation is approximately (5 V - 1 V) * 10 A * (1/0.92 - 1) = ~0.87 W. The 18-LQFN IV package theta_JA on a 4-layer 1 sq inch copper pour is approximately 40 C/W, giving a junction temperature rise of ~35 C above ambient - well within the 125 C max. For designs operating continuously at VIN = 5 V, IOUT = 10 A, in 85 C ambient, the 3x3 mm IV package is sufficient without external heatsink; derate to 7-8 A in sealed enclosures.
Do not omit the bootstrap capacitor - although the LTC3310SIV-1 has internal BST-to-SW bypass, some second-source compatible variants in the EV package require an external 100 nF X7R cap between BST and SW. Also note that the AGND pin (Pin 2) is a remote-sense ground, not the power ground return - connect AGND directly to the load-side ground and feedback divider bottom, while power ground returns flow through the exposed pad. Mixing AGND and PGND return paths can cause load regulation errors of 20-50 mV at full 10 A load.
For CISPR 25 Class 5 automotive EMI compliance, follow the reference layout exactly and add a small input pi-filter (10 uF + ferrite bead + 10 uF) on the VIN rail if the upstream supply is more than 50 mm away. The LTC3310SIV-1 Silent Switcher 2 architecture typically passes Class 5 on a 2-layer PCB without filtering, but a 4-layer stackup with a continuous ground plane beneath the SW node gives additional 6-10 dB margin in conducted emissions tests above 30 MHz.
When powering noise-sensitive analog rails (PLL VCOs, RF transceivers, precision ADCs), place the LTC3310SIV-1 in forced-continuous PWM mode (MODE pin high) rather than Burst Mode to eliminate sub-1 MHz switching noise fold-back. Add a second-stage LC filter (1 uH + 22 uF) after the output to achieve <1 mV pk-pk noise at the sensitive load. Burst Mode should be reserved for battery-powered applications where light-load efficiency outweighs output noise floor.
Compliance Information
RoHS and REACH compliance confirmed by #TRMPBF suffix and ADI product page. AEC-Q100 not qualified - for automotive, use the #W suffix variant. Halogen-free status not explicitly stated in verified data.
