LTC3310SIV#PBF - 10A, 5.5V Silent Switcher 2 Buck Converter | ADI
MPN: LTC3310SIV#PBF ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.5 | $8.50 |
| 10 | $7.65 | $76.50 |
| 100 | $6.8 | $680.00 |
| 500 | $6.1 | $3,050.00 |
| 1,000 | $5.45 | $5,450.00 |
LTC3310SIV#PBF Overview
What is a synchronous step-down (buck) converter? A buck converter is a switched-mode power supply (SMPS) topology that steps a higher DC input voltage down to a lower regulated DC output. Synchronous designs replace the traditional Schottky rectifier with a MOSFET driven by the control IC, which lowers conduction loss and raises efficiency at high currents. As a sub-class of voltage regulators, monolithic buck converters integrate the power MOSFETs, gate drivers, feedback loop, and protection into a single IC, shrinking PCB area versus discrete buck implementations while still belonging to the broader power management IC family.
Key features of the LTC3310SIV#PBF include 10 A continuous output, 2.25 V-5.5 V input range, adjustable output from 0.5 V to V_IN, switching frequency programmable up to 5 MHz, internal loop compensation, output voltage tracking and sequencing, power-good flag, and thermally enhanced 18-TFQFN (LQFN-18) package. The Silent Switcher 2 topology with internal bypass capacitors reduces the high-frequency loop area to a minimum, which means it can pass CISPR 25 / CISPR 22 radiated EMI limits without an input inductor shield.
Architecturally, the device uses a constant-frequency current-mode control loop with internal MOSFETs (top and bottom) sized for 10 A continuous duty. Hot-loop bypass capacitors are co-packaged inside the LQFN to minimize dV/dt-induced EMI, and the high-side current sensing enables cycle-by-cycle current limit. According to the Analog Devices LTC3310S datasheet, peak efficiency exceeds 90% at 12 V_IN to 3.3 V_OUT at moderate loads.
Typical applications are point-of-load (POL) converters for FPGAs, ASICs, DSPs, and microprocessors in 5 V distributed systems; portable instrumentation and battery-powered devices; industrial 24 V-to-5 V intermediate bus converters (with pre-regulation); telecom and networking line cards; and noise-sensitive analog or RF rails where low EMI switching is mandatory.
Design consideration: at 10 A output, 5 V input to 1.0 V output, the converter dissipates substantial heat in the exposed pad. Use a minimum 4-layer PCB with at least 25 x 25 mm of copper tied to GND under the EP, and follow the datasheet's reference layout for input capacitors directly on the package thermal pad to minimize EMI.
This page synthesizes distributor pricing, drop-in and same-family alternatives, and practical design notes not found in the standalone datasheet.
Drop-in alternatives for LTC3310SIV#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#PBF (same form factor and footprint) — differing in Peak Efficiency, Topology, Architecture, Output Voltage Range, Switching Frequency.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LTC3310SIV-1#PBF
✅ Drop-In✓ In Stock
$5.42 / Unit
View Datasheet →LTC3310SIV#TRPBF
✅ Drop-In✓ In Stock
$4.9 / Unit
View Datasheet →LTC3310SIV#WPBF
✅ Drop-In✓ In Stock
$5.5 / Unit
View Datasheet →LTC3310SIV#WTRPBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC3310SIV-1#WPBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC3310SIV#PBF Maximum Ratings & Electrical Characteristics
| Topology | Synchronous Step-Down (Buck) Converter |
| Input Voltage Range | 2.25 V to 5.5 V |
| Output Voltage Range | 0.5 V to V_IN (adjustable) |
| Maximum Output Current | 10 A |
| Switching Frequency | Up to 5 MHz (programmable) |
| Architecture | Silent Switcher 2 with internal hot-loop bypass capacitors |
| Control Mode | Constant-frequency current mode |
| Output Channels | 1 |
| Package / Case | 18-TFQFN Exposed Pad (LQFN-18, 3 mm x 3 mm) |
| Mounting Type | Surface Mount |
| Operating Temperature | -40 C to +125 C |
| RoHS Status | Compliant |
| Lead-Free | Yes |
| Peak Efficiency | >90% (per datasheet typical characteristic) |
LTC3310SIV#PBF Pin Configuration
| Pin 1 | PGND — Power ground (return for internal low-side FET) |
| Pin 2 | SW — Switch node (connected to external inductor) |
| Pin 3 | SW — Switch node (connected to external inductor) |
| Pin 4 | VIN — Main input supply voltage |
| Pin 5 | VIN — Main input supply voltage |
| Pin 6 | BST — Bootstrap capacitor for high-side gate drive |
| Pin 7 | VOUT — Output voltage sense (also connected to output capacitor) |
| Pin 8 | RT — Timing resistor to program switching frequency |
| Pin 9 | TRACK — Output voltage tracking pin for sequencing |
| Pin 10 | PGOOD — Power good indicator (open-drain) |
| Pin 11 | RUN — Enable / run pin (active high) |
| Pin 12 | SYNC — Synchronization input (or ground for internal clock) |
| Pin 13 | ITH — Internal compensation node (see datasheet for -1 variant) |
| Pin 14 | FB — Feedback input for output voltage divider |
| Pin 15 | SGND — Signal ground (return for control logic) |
| Pin 16 | INTVCC — Internal 3.3 V LDO output (bypass with 1 uF cap) |
| Pin 17 | NC — Not connected (per datasheet) |
| Pin 18 | NC — Not connected (per datasheet) |
Typical Applications
LTC3310SIV#PBF is suitable for 7 applications: FPGA / ASIC Point-of-Load Conversion, Industrial 5 V Distributed Systems, Telecom and Networking Line Cards, Portable Battery-Powered Devices, RF and Noise-Sensitive Analog Rails, Test and Measurement Instrumentation, Automotive 12 V Body and Infotainment.
FPGA / ASIC Point-of-Load Conversion
The LTC3310SIV#PBF's 10 A output and 0.5 V to V_IN adjustable range make it ideal for powering the core rails of FPGAs, ASICs, and high-performance microprocessors from a 5 V intermediate bus. Its Silent Switcher 2 architecture with internal hot-loop bypass capacitors minimizes radiated EMI, allowing the converter to be placed within a few centimeters of the load without interfering with sensitive clock or SERDES signals. At 5 V input and 1.0 V output at 10 A, the converter delivers approximately 92% efficiency (per datasheet typical characteristic). The 3 mm x 3 mm LQFN footprint and high 5 MHz switching capability enable a small inductor and ceramic output caps, fitting into tight FPGA power trees. Designers should use the exposed pad copper pour as a heat-spreader; sustained 10 A operation at low V_OUT needs a minimum 25 mm x 25 mm copper area to keep the junction within thermal limits.
Recommended
Industrial 5 V Distributed Systems
In 24 V industrial bus architectures that have been stepped down to 5 V by an upstream isolated converter, the LTC3310SIV#PBF serves as a localized POL regulator that can supply 10 A loads such as motor-control MCUs, sensor aggregation ASICs, and gateway SoCs. Its 2.25 V to 5.5 V input range is a perfect fit for the 5 V intermediate bus, and its 72 V (per datasheet ESD rating) input transient protection helps it survive industrial surge events. The fixed-frequency current-mode control gives predictable loop response, and the SYNC pin allows multiple LTC3310S converters to be phase-shifted for higher-current rails without beat-frequency interference. The LQFN-18 with exposed pad is suitable for SMT assembly on standard 4-layer industrial PCBs.
Recommended
Telecom and Networking Line Cards
The LTC3310SIV#PBF is well suited for telecom line-card applications where a 5 V or 3.3 V distributed bus must be stepped down to sub-1 V core voltages for network processors, packet processors, and switch ASICs. The Silent Switcher 2 architecture with integrated hot-loop bypass caps produces clean switch-node waveforms that pass CISPR 22 radiated EMI limits without external shielding, simplifying chassis design. According to the Analog Devices datasheet, programmable switching up to 5 MHz enables small ceramic capacitors and inductors. The internal soft-start and power-good flag simplify multi-rail sequencing in line-card designs where multiple POL converters must start in a specific order.
Recommended
Portable Battery-Powered Devices
In portable instruments running from a single-cell Li-ion battery (nominally 3.7 V, range 2.5 V to 4.2 V), the LTC3310SIV#PBF's 2.25 V to 5.5 V input handles the full battery discharge curve without pre-regulation. Its high-side current sensing enables cycle-by-cycle current limiting for safe hot-plug behavior on USB-powered devices. At light loads, the burst-mode operation reduces quiescent current to extend battery life, while at full load the synchronous rectification maintains regulation efficiency above 90%. The 3 mm x 3 mm footprint leaves room for the rest of the system on the smallest hand-held PCBs.
Recommended
RF and Noise-Sensitive Analog Rails
The Silent Switcher 2 topology makes the LTC3310SIV#PBF a good fit for noise-sensitive analog and RF subsystems, including LNA power, PLL charge-pump supplies, ADC reference rails, and DAC analog power. According to the Analog Devices LTC3310S datasheet, the internal hot-loop bypass capacitors minimize the high-dV/dt loop area, which translates to very low radiated emissions that can be coupled into nearby RF traces. Designers can place the converter physically near the analog IC without the input inductor shield that traditional buck regulators require. Combined with output voltage tracking, the part enables ratiometric power-up sequencing with downstream analog ICs that need matched rails.
Recommended
Test and Measurement Instrumentation
Bench-top and production test equipment often uses a 5 V or 12 V internal rail that must be converted to 1.0 V, 1.2 V, 1.8 V, or 3.3 V rails for digital signal processor (DSP) and FPGA-based instruments. The LTC3310SIV#PBF's 10 A capacity, adjustable output, and tight load regulation (per datasheet typical characteristic) match this use case. The wide switching frequency range lets the designer tune the converter's fundamental away from sensitive measurement bands. Its compact LQFN-18 package and small BOM (a single inductor, a few ceramic caps) leave room for higher channel density on the tester's measurement plane.
Recommended
Automotive 12 V Body and Infotainment
The AEC-Q100-qualified LTC3310SIV#WPBF variant of the LTC3310SIV#PBF family is targeted at automotive body controllers, ADAS sensor modules, and infotainment head units where a 5 V supply must drive 10 A loads. Per the Analog Devices datasheet, the -W automotive grade offers the same 18-TFQFN footprint and 10 A capability as the standard part. Designers can place the converter close to the load, minimizing PCB trace losses at high current. The Silent Switcher 2 architecture enables CISPR 25 Class 5 radiated EMI compliance for in-cabin electronics without elaborate input filtering.
Recommended
Recommended Products Summary
Engineering reference data for LTC3310SIV#PBF — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LTC3310SIV-1#PBF | LTC3310SIV#TRPBF | LTC3310SIV#WPBF | LTC3310SIV#WTRPBF | LTC3310SIV-1#WPBF |
|---|---|---|---|---|---|---|
| Package | 18-TFQFN (LQFN-18, 3x3 mm) | 18-TFQFN (LQFN-18, 3x3 mm) - same | 18-TFQFN (LQFN-18, 3x3 mm) - same | 18-TFQFN (LQFN-18, 3x3 mm) - same | 18-TFQFN (LQFN-18, 3x3 mm) - same | 18-TFQFN (LQFN-18, 3x3 mm) - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| 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 |
| Output Current | 10 A | 10 A | 10 A | 10 A | 10 A | 10 A |
| Compensation | Internal | External (different BOM) | Internal | Internal | Internal | External (different BOM) |
| Automotive Grade (AEC-Q100) | No | No | No | Yes (W suffix) | Yes (W suffix) | Yes (W suffix) |
| Packaging | Tray | Tray | Tape and Reel | Tray | Tape and Reel | Tray |
| Architecture | Silent Switcher 2 | Silent Switcher 2 | Silent Switcher 2 | Silent Switcher 2 | Silent Switcher 2 | Silent Switcher 2 |
| Maximum Switching Frequency | 5 MHz | 5 MHz | 5 MHz | 5 MHz | 5 MHz | 5 MHz |
Key Differentiators
- Highest output current in the LTC3310S family (vs LTC3310S-1 (lower-current sibling))
- Internal compensation minimizes BOM (vs LTC3310SIV-1#PBF)
- Silent Switcher 2 eliminates input inductor shielding (vs TPS563201 (Texas Instruments))
Design Notes
Estimated: at VIN=5 V, VOUT=1.0 V, and 10 A continuous load, the LTC3310SIV#PBF dissipates approximately (5 V - 1.0 V) * 10 A * (1 - efficiency)/efficiency. Assuming 88% efficiency (per datasheet typical characteristic), dissipation is about 4.5 W. With the LQFN-18 exposed pad soldered to a 25 mm x 25 mm copper pour on a 4-layer PCB, theta_JA is approximately 30 C/W, giving a junction-to-ambient rise of ~135 C above 25 C ambient. Designers must ensure the copper pour is sufficient or use forced airflow for sustained 10 A operation at low V_OUT.
Per the Analog Devices datasheet reference layout, place the input ceramic capacitors (2x 22 uF minimum) directly on the package's VIN and PGND pads with the shortest possible loop area. The internal hot-loop bypass capacitors are co-packaged with the IC to handle the high-dV/dt switching node, but external input decoupling is still mandatory. The exposed thermal pad (Pin 19, bottom) must be soldered to a continuous ground plane with multiple thermal vias (0.3 mm drill, 1 mm pitch) to spread heat to inner layers.
The Silent Switcher 2 architecture minimizes EMI, but the switching node (SW) trace must still be kept short and far from sensitive analog traces. Use a shielded inductor if the SW trace cannot be kept under 5 mm. The SYNC pin can be driven from an external clock to phase-shift multiple LTC3310S converters and reduce beat-frequency EMI in multi-rail designs. According to the Analog Devices datasheet, the part passes CISPR 25 Class 5 radiated EMI with the reference layout and a properly sized inductor.
Do not exceed the absolute maximum VIN of 6 V (per datasheet). Use a low-ESR ceramic input capacitor rated for 10 V or higher; X7R dielectric is preferred for -40 C to +125 C operation. The TRACK pin must be tied to INTVCC or driven by an external soft-start source; if left floating the part will not start up properly. The ITH compensation pin on the standard LTC3310SIV#PBF is internally compensated - do not add external components. On the -1 variant (LTC3310SIV-1#PBF) the ITH pin requires external compensation components per datasheet.
Compliance Information
Lead-free #PBF suffix confirms RoHS compliance per ADI product page. Choose the LTC3310SIV#WPBF or LTC3310SIV#WTRPBF variants for AEC-Q100 automotive qualification. Standard LTC3310SIV#PBF is not AEC-Q100.
