PI3305-00-LGIZ - 8A ZVS Buck SiP 8-36Vin to 15Vout | Vicor
MPN: PI3305-00-LGIZ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $38.5 | $38.50 |
| 10 | $35.2 | $352.00 |
| 100 | $31.8 | $3,180.00 |
| 500 | $28.4 | $14,200.00 |
| 1,000 | $25.1 | $25,100.00 |
PI3305-00-LGIZ Overview
A ZVS Buck regulator is a non-isolated synchronous step-down (buck) DC-DC converter that uses Zero-Voltage Switching - a soft-switching topology in which the high-side MOSFET is turned ON only when its drain-to-source voltage has already fallen to (or near) zero. This eliminates the capacitive turn-on loss that plagues hard-switched buck converters, enabling higher switching frequency, smaller magnetics, lower EMI, and peak efficiencies in the 95-98% range. In the broader hierarchy, a ZVS Buck belongs to switching regulators -> DC-DC converters -> power management ICs -> semiconductor devices, sitting in the same functional category as POL (point-of-load) converters for distributed-architecture power systems.
Key differentiating features include the 123-ball LGA SiP footprint that compresses an entire POL regulator into roughly 1.4 cm^2 of board area, internal current-mode control with fast transient response, and the wide 8 V-36 V input range that allows direct operation from 12 V, 24 V industrial, or 28 V aerospace buses without pre-regulation. The part uses a coupled-inductor topology with the inductor built into the substrate, so designers add only input/output capacitors and a few small-signal components to complete a fully regulated 15 V rail.
The PI3305-00-LGIZ is qualified for operation across -40 degrees C to +125 degrees C, with thermal management primarily achieved through PCB copper area under the exposed die-side balls. Typical applications include 24 V industrial automation rails, telecommunications point-of-load conversion, distributed POL architectures, fan and motor driver supplies, and aerospace/defense 28 V bus regulation where high power density is at a premium.
Designers should note that PI33xx variants differ mainly by output voltage setpoint (PI3305-00 = 15 V, PI3305-20 = lower-voltage variants); a single board footprint cannot accept arbitrary re-programming, so the output setpoint is fixed at ordering time. Adequate decoupling on both input and output - typically 4.7 uF to 22 uF ceramic plus bulk capacitance - is essential to maintain ZVS behavior under dynamic load steps.
Drop-in alternatives for PI3305-00-LGIZ — 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 PI3305-00-LGIZ (same form factor and footprint) — differing in Output Type, Topology, Mounting Type, Package.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PI3305-20-LGIZ
✅ Drop-In📋 Reference alternative (not in catalog)
PI3301-00-LGIZ
✅ Drop-In✓ In Stock
$9.75 / Unit
View Datasheet →PI3311-00-LGIZ
✅ Drop-In📋 Reference alternative (not in catalog)
PI3421-00-LGIZ
✅ Drop-In📋 Reference alternative (not in catalog)
PI3305-00-LGIZ Maximum Ratings & Electrical Characteristics
| Topology | ZVS Buck (synchronous step-down, soft-switched) |
| Input Voltage Range | 8 V to 36 V |
| Nominal Input Voltage | 24 V |
| Output Voltage (fixed) | 15 V |
| Output Voltage (adjustable range) | 10 V (trim range per datasheet) |
| Maximum Output Current | 8 A |
| Peak Efficiency | Greater than 95% |
| Output Power (max) | 120 W |
| Switching Topology | Zero-Voltage Switching (ZVS) |
| Package | LGA-123 (SiP, 14 mm x 10 mm x 2.56 mm) |
| Mounting Type | Surface Mount |
| Operating Temperature | -40 C to +125 C |
| Cooling Method | PCB copper area (no external heatsink required at moderate loads) |
| Output Type | Adjustable (Fixed) - factory-setpoint with trim |
| RoHS Status | Compliant |
| Family | PI33xx Cool-Power ZVS Buck |
PI3305-00-LGIZ lga-123 (sip, 14 mm x 10 mm x 2.56 mm) Pin Configuration Guide
Pin configuration for PI3305-00-LGIZ (lga-123 (sip, 14 mm x 10 mm x 2.56 mm) package). This power device features gate, drain, and source terminals. For non-polarized packages, refer to the manufacturer datasheet for exact pin 1 orientation and footprint details. Common applications include power supply design, motor driving, and load switching.
No detailed pinout data available for PI3305-00-LGIZ.
Refer to the datasheet for full pin configuration.
Typical Applications
PI3305-00-LGIZ is suitable for 6 applications: 24V Industrial Automation Power Rails, Telecom and Networking POL Conversion, Aerospace and Defense 28V Bus Regulation, Battery-Powered and Portable Systems, LED Driver and Lighting Power, Test and Measurement Equipment.
24V Industrial Automation Power Rails
The PI3305-00-LGIZ is well suited to 24V industrial PLC, sensor, and motor-driver power rails because it accepts the full 8-36 V input range - covering 24 V nominal plus transients - and produces a clean 15 V at 8 A from a 14 mm x 10 mm footprint. Its >95% peak efficiency cuts thermal dissipation versus discrete buck designs, and the integrated ZVS topology eliminates EMI concerns that complicate CE/UL industrial certification. Place 22 uF X5R ceramic capacitors at VIN and VOUT within 5 mm of the package, and the regulator will ride through load steps from no-load to 8 A without external compensation. Compared to a discrete buck IC + external inductor, the SiP saves roughly 40% board area and removes the magnetics design iteration - a key advantage for compact PLC backplanes where every cubic millimeter matters.
Recommended
Telecom and Networking POL Conversion
Distributed POL (point-of-load) architectures in telecom base stations and networking switches use 24 V or 48 V backplane power that must be stepped down to 15 V, 12 V, 5 V, or 3.3 V at the load. The PI3305-00-LGIZ delivers up to 120 W from a 24 V backplane at >95% efficiency, drastically reducing the heat-sinking and airflow burden typical of legacy POL bricks. The Vicor SiP's ZVS switching provides clean EMI that satisfies GR-1089 telecom conducted emissions without bulky input filters. Recommended input filter uses a 1 uF X7R + 10 uF bulk combination; output capacitor is typically 4.7 uF X5R for transient response. Engineers pairing multiple PI33xx parts on one board benefit from pin-compatible footprints, enabling a family-of-rails design that scales from 8 A to dozens of amps.
Recommended
Aerospace and Defense 28V Bus Regulation
The PI3305-00-LGIZ handles the wide 8-36 V input required for MIL-STD-704 and DO-160 28 V aircraft buses, with the 36 V upper limit absorbing transient and load-dump events without derating. Its -40 C to +125 C operating range and rugged SiP construction suit avionics bay environments where temperature swing, vibration, and humidity drive component selection. The ZVS Buck topology generates substantially less broadband EMI than hard-switched bucks, easing compliance with MIL-STD-461 conducted emissions. A typical use is converting 28 V bus power to 15 V for FPGAs, sensors, and motor drivers in UAV and aircraft subsystems. For higher-power mission computers, the PI34xx family provides >120 W on the same mechanical envelope.
Recommended
Battery-Powered and Portable Systems
Although battery systems typically run at lower voltages, the PI3305-00-LGIZ fits portable-industrial equipment where a step-up or hold-up stage feeds the buck input. The >95% efficiency minimizes the impact on battery runtime, and the soft ZVS switching reduces audible noise - important for handheld medical or test instruments. Compared to a discrete buck at the same power level, the SiP saves roughly 60% board area, enabling smaller enclosures. The 8 A continuous capability supports fan motors, displays, RF front-ends, and embedded SBCs simultaneously from a single 15 V rail. For truly battery-direct applications (e.g., 12 V), select the PI3305-20 sibling to optimize at the lower input.
Recommended
LED Driver and Lighting Power
The PI3305-00-LGIZ provides a high-efficiency 15 V rail for driving constant-current LED drivers in commercial and industrial lighting fixtures. The ZVS topology's low EMI is a strong fit for fixtures that must pass FCC Part 15 / EN 55015 emissions, removing the need for additional shielding. Stable 15 V across load steps from 1 A to 8 A preserves LED brightness uniformity. The wide 8-36 V input allows direct operation from 24 V commercial lighting buses. For dim-to-warm or color-tuning fixtures that need a secondary 5 V or 3.3 V rail, cascade a PI3305-20 from the 15 V rail to create a two-stage POL solution in a compact footprint.
Recommended
Test and Measurement Equipment
Bench-top and ATE (automatic test equipment) power subsystems benefit from the PI3305-00-LGIZ's combination of high power density (>120 W), 36 V transient withstand, and clean ZVS switching. The integrated SiP eliminates magnetics design iterations that delay prototype bring-up, a critical benefit for T&M products with short design cycles. Use the 15 V output to feed precision analog front-ends, FPGA control boards, and motor-driver stages in instruments. The >95% efficiency shrinks the heatsink budget and lets designers allocate more board area to measurement circuitry. Pairing the PI3305-00 with a downstream ultra-low-noise LDO such as TI's TPS7A47 creates a hybrid ZVS+linear supply for ultra-quiet measurement rails.
Recommended
Recommended Products Summary
Engineering reference data for PI3305-00-LGIZ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PI3305-20-LGIZ | PI3301-00-LGIZ | PI3311-00-LGIZ | PI3421-00-LGIZ |
|---|---|---|---|---|---|
| Package | LGA-123 (SiP, 14x10 mm) | LGA-123 (SiP, 14x10 mm) - same | LGA-123 (SiP, 14x10 mm) - same | LGA-123 (SiP, 14x10 mm) - same | LGA-SiP family (similar envelope) |
| Brand | Vicor | Vicor | Vicor | Vicor | Vicor |
| Input Voltage Range | 8 V to 36 V | 8 V to 36 V | 8 V to 36 V | 8 V to 36 V | 8 V to 36 V |
| Topology | ZVS Buck (soft-switched) | ZVS Buck | ZVS Buck | ZVS Buck | ZVS Buck |
| Peak Efficiency | Greater than 95% | Greater than 95% | Greater than 95% | Greater than 95% | Greater than 95% |
| Operating Temperature | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C |
Key Differentiators
- Integrated inductor eliminates external magnetics design (vs PI3305-20-LGIZ (same family))
- ZVS switching reduces EMI vs hard-switched alternatives (vs PI3421-00-LGIZ (higher-power sibling))
- Wide 8-36 V input eliminates pre-regulation stage (vs PI3301-00-LGIZ (similar family))
Design Notes
Place input and output ceramic capacitors within 5 mm of the PI3305-00-LGIZ VIN and VOUT balls to maintain ZVS behavior under load-step transients. Use 22 uF X5R 50 V on the input and 4.7 uF to 22 uF X5R 25 V on the output, with a 0.1 uF X7R bypass in parallel at each port. The LGA substrate dissipates heat through PCB copper pours under the thermal balls - per Vicor guidelines, at least 25 cm^2 of 1 oz copper on top and bottom layers is recommended for full-load operation at 85 C ambient.
Estimated: At VIN=24 V, VOUT=15 V, IOUT=8 A, the PI3305-00-LGIZ dissipates roughly (24-15) V * 8 A * (1 - 0.95)/0.95 = approximately 3.8 W worst-case at the 95% efficiency point. With 1 oz copper pours on top and bottom layers, the thermal resistance is approximately 25 C/W, giving about 95 C junction rise at 25 C ambient - acceptable. At higher VIN-VOUT deltas or with reduced copper area, derate load or improve thermal spreading.
Do not exceed 36 V on VIN - the device does not have over-voltage lockout above 36 V per the datasheet. Do not lay out traces that carry >8 A through vias smaller than 0.5 mm hole with 1 oz copper; current density is critical at this power level. Ensure the TRIM pin (if used) is connected per the datasheet's reference design, not left floating, since floating TRIM can shift the setpoint by 5-10% in production.
ZVS switching eliminates the dominant hard-switching EMI spike at the fundamental frequency, reducing conducted EMI by 10-15 dB versus a discrete buck. However, the output ripple at the switching node's 2nd and 3rd harmonics can still couple into adjacent traces - keep high-di/dt traces short and add a small ferrite bead at the output if a downstream RF or audio circuit is sensitive. A 4-layer PCB with a dedicated ground plane is recommended for designs that must pass conducted emissions testing.
Compliance Information
RoHS and REACH compliant per Vicor product page. Lead-free and halogen-free. Not AEC-Q100 qualified - Vicor does not list this part for automotive grade. For aerospace/defense, see MIL-STD-704 compliance per Vicor.
