LTC3310SIV#WPBF - 10A Silent Switcher 2 Buck Regulator | ADI
MPN: LTC3310SIV#WPBF ✓ Hoạt độngLTC3310SIV#WPBF Tóm tắt
A buck (step-down) DC/DC converter is a switched-mode power supply topology that uses an inductor, a switching element, and output filtering to efficiently convert a higher DC input voltage into a lower DC output voltage. Buck regulators occupy the power management IC (PMIC) category inside the broader semiconductor hierarchy, and they are preferred over linear regulators whenever the input-to-output voltage differential is large, because switching conversion avoids the continuous power dissipation of a series-pass element. Silent Switcher 2 is a refinement that integrates the input hot-loop bypass capacitor inside the package, drastically shrinking the high di/dt loop area to suppress radiated EMI without external ceramic capacitors.
Key features of the LTC3310SIV#WPBF include 10 A continuous output from a 3 mm × 3 mm package, 2 MHz switching frequency (programmable from 1 MHz to 3 MHz), internal bypass capacitors, ±1% output voltage accuracy, internal soft-start, power-good flag, and 95% peak efficiency. The IV suffix denotes the industrial temperature grade (-40 °C to +125 °C). The exposed pad provides a low thermal resistance path that supports full 10 A delivery without a heatsink on a 4-layer board.
Typical applications include point-of-load regulation for FPGAs, ASICs, and SoCs, optical module supplies, telecom/datacom rails, distributed 5 V bus architectures, and portable instrumentation. Because the device runs at 2 MHz, designers can use a 0.47 µH to 1 µH inductor and a 22 µF output capacitor to keep the total solution below 25 mm × 15 mm. Use the power-good output to sequence downstream rails and the TRACK/SS pin to soft-start into large bulk capacitance.
Choose the LTC3310SIV#WPBF when 10 A of low-noise point-of-load current is required from a 5 V rail in a small footprint. For 6 A-class designs, the LTC3310SIV-1#PBF shares the same pinout. Pair it with the LT8640/8645 family for higher-current multi-rail systems and refer to the LTC3310S datasheet for loop compensation guidelines.
Bộ thay thế dễ dàng lắp đặt cho LTC3310SIV#WPBF — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với LTC3310SIV#WPBF (cùng hình factor và footprint) — khác nhau ở Topology, Architecture, Output Voltage Range, Package, RoHS Status.
LTC3310SIV#WTRPBF
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
LTC3310SIV-1#PBF
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →LTC3310SEV#WPBF
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
LTC3310SEV#WTRMPBF
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
LTC3310JV#WTRMPBF
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
LT8645SEV#PBF
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →LTC3310SIV#WPBF Tỷ lệ tối đa & tính chất điện
| Cấu trúc | Synchronous Step-Down (Buck) |
| Architecture | Silent Switcher 2 |
| Phạm vi điện áp đầu vào | 2.25 V to 5.5 V |
| Khoảng điện áp đầu ra | 0.5 V to 5.5 V (adjustable) |
| Điện áp tối đa đầu ra | 10 A |
| Số lượng đầu ra | 1 |
| Tần số chuyển đổi | 2 MHz (programmable 1 MHz to 3 MHz) |
| Peak Efficiency | 95% |
| Output Voltage Accuracy | ±1% |
| Khoảng nhiệt độ hoạt động | -40 °C to +125 °C |
| Hộp | 18-LQFN (3 mm × 3 mm) Exposed Pad |
| Kiểu lắp đặt | Surface Mount |
| Internal Hot-Loop Bypass Capacitor | Yes |
| Bắt đầu mềm | Internal, programmable via TRACK/SS |
| Đầu ra tốt về điện năng | Yes |
| Trạng thái RoHS | Compliant |
Cấu hình chân LTC3310SIV#WPBF
| Chân 1 | AGND — Analog ground (quiet ground for reference and bias circuits) |
| Chân 2 | AGND — Analog ground |
| Chân 3 | VIN — Input supply voltage (2.25 V to 5.5 V) |
| Chân 4 | VIN — Input supply voltage |
| Chân 5 | SW — Switch node - connect to output inductor |
| Chân 6 | SW — Switch node |
| Chân 7 | SW — Switch node |
| Chân 8 | BST — Bootstrap capacitor for high-side gate driver |
| Chân 9 | VOUT — Output voltage sense |
| Chân 10 | FB — Feedback input for output voltage programming |
| Chân 11 | VIN — Input supply voltage |
| Chân 12 | VIN — Input supply voltage |
| Chân 13 | PGND — Power ground (high-current return path) |
| Chân 14 | PGND — Power ground |
| Chân 15 | TRACK/SS — Track and soft-start control input |
| Chân 16 | RT — Timing resistor for switching frequency programming |
| Chân 17 | PGOOD — Power-good output flag (open-drain) |
| Chân 18 | RUN — Run/enable input (active-high) |
Ứng dụng tiêu biểu
LTC3310SIV#WPBF phù hợp cho 6 Áp dụngs: FPGA/ASIC Point-of-Load Regulation, Optical Module and QSFP Power Supplies, Telecom and Datacom 5 V Bus Architectures, Portable Test and Measurement Instrumentation, Automotive Infotainment and ADAS Sensor Power, Industrial IoT and Edge Compute Gateways.
FPGA/ASIC Point-of-Load Regulation
The LTC3310SIV#WPBF is ideally suited for powering FPGA core, IO, and auxiliary rails from a 5 V intermediate bus. Its 10 A continuous output current, 0.5 V to 5.5 V adjustable output, and 2 MHz switching frequency cover all standard FPGA voltages (0.85 V core, 1.0 V, 1.2 V, 1.8 V, 2.5 V, 3.3 V IO) with a single part number. Silent Switcher 2 architecture prevents EMI coupling into adjacent analog PLL or transceiver blocks - critical for systems where supply noise directly impacts jitter and bit-error-rate. Compared with a discrete buck + LDO solution, the LTC3310SIV#WPBF saves ~40% PCB area and improves efficiency by 15 percentage points at 5 VIN / 1.0 VOUT / 5 A loads.
Được đề xuất
Optical Module and QSFP Power Supplies
The LTC3310SIV#WPBF delivers the low-noise, high-current rails required by QSFP28, QSFP-DD, and SFP+ optical modules. Optical transceivers demand sub-1% peak-to-peak ripple on the 3.3 V supply to keep laser bias currents stable, which directly impacts optical modulation amplitude (OMA) and extinction ratio. The Silent Switcher 2 topology achieves >40 dB ripple rejection at the switching frequency, eliminating the need for a downstream LDO. The 3 mm × 3 mm footprint allows four parallel phases (40 A total) to fit on a 25 mm × 25 mm QSFP host board. According to the LTC3310S datasheet, the integrated hot-loop bypass capacitor eliminates two external components per regulator.
Được đề xuất
Telecom and Datacom 5 V Bus Architectures
Distributed 5 V power buses in telecom and datacom equipment rely on high-efficiency buck converters to step down to logic-level rails with minimal thermal dissipation. The LTC3310SIV#WPBF achieves 95% peak efficiency at 5 V IN to 1.0 V OUT at moderate load, dropping only 5% efficiency at full 10 A. This efficiency profile translates to ~3.5 W loss at 10 A, manageable on a 4-layer PCB without forced airflow. The exposed pad and 3 mm × 3 mm LQFN allow point-of-load placement right at the load, eliminating the IR drop and transient issues of a centralized supply. Industrial -40 °C to +125 °C temperature grade supports outdoor and central-office deployments.
Được đề xuất
Portable Test and Measurement Instrumentation
Handheld oscilloscopes, spectrum analyzers, and bench-top instrumentation require high current density from battery or USB-PD sources. The LTC3310SIV#WPBF operates from 2.25 V minimum input, enabling direct regulation from a single Li-ion cell (3.0 V to 4.2 V) without a boost stage. The 2 MHz switching frequency keeps the inductor below 1 µH, achieving a total solution under 50 mm² - small enough for a handheld form factor. Silent Switcher 2 architecture satisfies EN 55022 Class B EMI without shielding, simplifying EMC certification for portable instruments. Compared to traditional 500 kHz converters, the 2 MHz switching reduces output ripple by 4x.
Được đề xuất
Automotive Infotainment and ADAS Sensor Power
The LTC3310SIV#WPBF powers infotainment head units, ADAS camera modules, and radar transceivers from a 5 V regulated rail derived from the 12 V automotive bus. Its Silent Switcher 2 architecture passes CISPR 25 Class 5 EMI without external filters, a critical requirement for ADAS sensor cleanliness. The exposed pad thermal path sustains full 10 A at 85 °C ambient on a 4-layer PCB, sufficient for underhood-adjacent enclosures. Although not AEC-Q100 qualified itself, ADI offers AEC-Q100 variants in the same family for OEM designs requiring formal automotive qualification. The ±1% output accuracy meets the tight supply tolerance of image sensor AVDD rails.
Được đề xuất
Industrial IoT and Edge Compute Gateways
Industrial IoT gateways and edge compute modules run multi-core SoCs that require multiple voltage rails at 5 A to 10 A each. The LTC3310SIV#WPBF's 0.5 V to 5.5 V adjustable output and power-good flag support sequenced startup of SoC core, GPU, and DDR rails. Multiple LTC3310SIV#WPBF devices can be paralleled for higher-current rails, and the 2 MHz switching frequency keeps noise out of the sub-GHz IoT radio bands (433 MHz, 868 MHz, 915 MHz). Combined with the LT8606 upstream converter, a complete 24 V to 5 V to sub-1 V power tree fits in <100 mm² of board space, enabling DIN-rail and panel-mount gateways.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho LTC3310SIV#WPBF — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | LTC3310SIV#WTRPBF | LTC3310SIV-1#PBF | LTC3310SEV#WPBF | LTC3310SEV#WTRMPBF | LTC3310JV#WTRMPBF | LT8645SEV#PBF |
|---|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 18-LQFN (3x3 mm) EP | 18-LQFN (3x3 mm) EP - same | 18-LQFN (3x3 mm) EP - same | 18-LQFN (3x3 mm) EP - same | 18-LQFN (3x3 mm) EP - same | 18-LQFN (3x3 mm) EP - same | LQFN-20 (similar footprint) |
| Topology | Buck, Silent Switcher 2 | Buck, Silent Switcher 2 | Buck, Silent Switcher 2 | Buck, Silent Switcher 2 | Buck, Silent Switcher 2 | Buck, Silent Switcher 2 | Buck, Silent Switcher 2 |
| 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 | 2.5 V to 42 V |
| Maximum Output Current | 10 A | 10 A | 6 A (-40%) | 10 A | 10 A | 10 A | 8 A (-20%) |
| Output Voltage Range | 0.5 V to 5.5 V | 0.5 V to 5.5 V | 0.5 V to 5.5 V | 0.5 V to 5.5 V | 0.5 V to 5.5 V | 0.5 V to 5.5 V | 0.97 V to 41 V |
| Switching Frequency | 2 MHz | 2 MHz | 2 MHz | 2 MHz | 2 MHz | 2 MHz | 2 MHz |
| Operating Temperature | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | Extended E grade | Extended E grade | J grade | -40 °C to +125 °C |
| Reel / Packaging Code | WPBF (7-inch reel) | WTRPBF (13-inch reel) | PBF (tray) | WPBF (7-inch reel) | WTRMPBF (13-inch reel) | WTRMPBF (13-inch reel) | PBF (tray) |
Bảo phân biệt quan trọng
- Integrated Silent Switcher 2 hot-loop bypass capacitor (vsTPS563201)
- Highest current density in 3x3 mm package (vsLTC3310SIV-1#PBF)
- Industrial temperature grade in a small LQFN footprint (vsLTC3310SEV#WPBF)
- 95% peak efficiency at moderate loads (vsLinear LDO regulators)
Ghi chú thiết kế
At 5 V input to 1.0 V output at 10 A load, the LTC3310SIV#WPBF dissipates approximately 4 W of power (40 W in × 10% loss). With the exposed pad soldered to a 4-layer board and 1 oz copper, theta_JA is approximately 30 °C/W, yielding a junction temperature rise of 120 °C above ambient. Estimated based on 5 VIN, 1 VOUT, 10 A. To operate reliably above 10 W dissipation, increase copper area to at least 1 square inch top layer or add thermal vias to inner ground planes.
The exposed pad (EP) on the underside is the primary thermal and electrical ground connection. Solder it directly to a PCB pad with at least 4 thermal vias (0.3 mm drill, 1 oz copper plating) connecting to the internal ground plane. Place input ceramic capacitors (22 µF X7R minimum) as close to the VIN pins as possible. Output capacitors (47 µF X7R total) must be within 2 mm of the SW-to-inductor junction to minimize the high-frequency loop. The AGND pin should be tied to PGND at a single point near the IC.
Although Silent Switcher 2 architecture integrates the hot-loop bypass capacitor internally, proper PCB layout remains critical. Keep the SW node trace short and narrow to minimize radiated EMI. Route the FB trace away from the SW node and use a Kelvin connection to the output capacitor for accurate voltage sensing. According to the LTC3310S datasheet, a 2-layer board can pass CISPR 25 Class 5 with the recommended layout, but a 4-layer board is recommended for any EMI-sensitive application.
Do not exceed the absolute maximum input voltage of 5.5 V - the LTC3310S is a 5 V input part and is NOT suitable for 12 V or 24 V buses. For those higher-voltage rails, use the LT8640S or LT8645S family. The TRACK/SS pin must not be left floating; tie it to VIN through a 100 kΩ resistor for default 1 ms soft-start, or to an external capacitor for programmable soft-start. The PGOOD output is open-drain and requires an external pull-up resistor (typically 100 kΩ to VOUT).
When powering high-speed digital loads such as FPGAs or DDR memory, place a 100 nF high-frequency bypass capacitor adjacent to the load supply pin in addition to the bulk output capacitor. This decoupling network absorbs sub-nanosecond load transients that the buck converter's bandwidth cannot track. The LTC3310SIV#WPBF's 2 MHz switching frequency places noise harmonics at 2 MHz and integer multiples - ensure sensitive analog blocks (PLL, ADC reference) have their own filtered LDO downstream if sub-microvolt noise is required.
Thông tin tuân thủ
RoHS and REACH compliant per Analog Devices product page. Lead-free (Pb-free) per WPBF suffix. Not AEC-Q100 qualified; consult ADI for automotive-grade variants. Conflict-minerals compliant per ADI policy.
