LT8646SIV#WPBF - 65V 8A Silent Switcher 2 Buck | ADI
MPN: LT8646SIV#WPBF ✓ فعالLT8646SIV#WPBF نمای کلی
A buck (step-down) DC-DC switching regulator converts a higher DC input voltage to a lower DC output voltage by rapidly switching an inductor and using energy-storage elements. Silent Switcher 2 architecture further reduces EMI by integrating loop-capacitance structures, enabling the LT8646SIV to meet stringent automotive CISPR 25 Class 5 EMI limits without complex shielding. It belongs to the switching regulator family within voltage regulators and power management ICs.
Key specifications include 2.5 µA quiescent current (Burst Mode operation), 96% peak efficiency, 200 kHz to 2.2 MHz programmable switching frequency, and internal top and bottom N-channel MOSFET switches. The -IV suffix indicates an operating temperature range of -40° C to +125° C, with the #WPBF suffix denoting a 32-lead 6 mm × 4 mm LQFN exposed-pad package delivered in tray. The device also includes internal loop compensation, power-good flag, and synchronization capability.
Internally the regulator uses a current-mode control topology with a precision reference and integrated high-side / low-side MOSFETs that minimize external component count. The exposed pad provides a low thermal resistance path (~25° C/W θJA on a 4-layer JEDEC PCB) enabling full 8 A delivery up to 125° C junction with appropriate copper. The Silent Switcher 2 layout symmetry further suppresses switching-node EMI.
Typical applications include automotive always-on and infotainment systems, industrial 24 V/48 V bus converters, battery-powered portable equipment, and general-purpose point-of-load regulation in distributed 5 V/12 V/24 V systems. The wide input range allows direct operation from 12 V and 24 V automotive rails as well as 36 V/48 V industrial supplies without a preregulator.
When designing with the LT8646SIV, ensure a minimum of 4-layer PCB with low-ESR ceramic input/output capacitors placed close to the IC and sufficient ground copper under the exposed pad. Switching frequency selection should balance efficiency versus inductor size - 1 MHz to 2 MHz suits compact designs, while 300 kHz to 500 kHz optimizes peak efficiency.
This page synthesizes distributor pricing, automotive-grade variants, and Silent Switcher 2 design considerations not consolidated in the manufacturer datasheet alone.
جایگزین‌های drop-in برای LT8646SIV#WPBF — همان پکیج، سازگار پین‌به‌پین. قطعات با پکیج متفاوت که نیاز به تغییر PCB دارند مستثنی هستند.
گونه‌ها در این سری
مدل‌های هم‌سری که جایگزین مستقیم هستند برای LT8646SIV#WPBF (همان فرم‌فاکتور و فوت‌پرینت) — متفاوت در Architecture, Input Voltage Range, Internal MOSFETs, Maximum Output Current, Output Voltage Range.
LT8646SIV#WTRPBF
✅ جایگزین مستقیم📋 جایگزین مرجع (خارج از کاتالوگ)
LT8645SIV#WPBF
✅ جایگزین مستقیم📋 جایگزین مرجع (خارج از کاتالوگ)
LT8646SIV
✅ جایگزین مستقیم📋 جایگزین مرجع (خارج از کاتالوگ)
LT8646SJV#WPBF
✅ جایگزین مستقیم📋 جایگزین مرجع (خارج از کاتالوگ)
LT8645SIV#WTRPBF
✅ جایگزین مستقیم📋 جایگزین مرجع (خارج از کاتالوگ)
LT8646SIV#WPBF حداکثر مقادیر مجاز و مشخصات الکتریکی
| توپولوژی | Synchronous Step-Down (Buck) |
| محدوده ولتاژ ورودی | 3.4 V to 65 V |
| محدوده ولتاژ خروجی | 0.97 V to 64 V (adjustable) |
| حداکثر جریان خروجی | 8 A |
| Switching Frequency Range | 200 kHz to 2.2 MHz (programmable) |
| Quiescent Current (Burst Mode) | 2.5 µA typical |
| Peak Efficiency | 96% |
| Architecture | Silent Switcher 2 with integrated bypass capacitors |
| Internal MOSFETs | Top + bottom N-channel MOSFET switches |
| بسته‌بندی | 32-pin LQFN (6 mm x 4 mm) with Exposed Pad |
| محدوده دمای کاری | -40°C to +125°C (-IV suffix) |
| نوع نصب | Surface Mount |
| سطح MSL | 3 (per JEDEC J-STD-020) |
| Automotive Qualification | AEC-Q100 (Automotive grade per Arrow listing) |
| وضعیت RoHS | Compliant |
| Synchronization | External clock sync input |
| Power Good Flag | Yes |
| Thermal Resistance (θJA) | ~25°C/W on 4-layer JEDEC board (estimated from package family) |
پیکربندی پین LT8646SIV#WPBF
| پین 1 | BST — Boost supply for top-side gate driver |
| پین 2 | VIN — Input voltage supply |
| پین 3 | VIN — Input voltage supply |
| پین 4 | EN/UV — Enable and undervoltage lockout |
| پین 5 | RT — Switching frequency programming resistor |
| پین 6 | SYNC — External clock synchronization input |
| پین 7 | PGOOD — Power good output flag |
| پین 8 | NC — Not connected |
| پین 9 | VOUT — Regulated output voltage sense |
| پین 10 | VOUT — Regulated output voltage sense |
| پین 11 | SW — Switch node (inductor connection) |
| پین 12 | SW — Switch node (inductor connection) |
| پین 13 | GND — Ground |
| پین 14 | GND — Ground |
| پین 15 | FB — Feedback input (voltage divider) |
| پین 16 | TR/SS — Soft-start / tracking input |
| پین 17 | VC — Internal voltage compensation node |
| پین 18 | NC — Not connected |
| پین 19 | NC — Not connected |
| پین 20 | INTVCC — Internal 5 V LDO bypass |
| پین 21 | NC — Not connected |
| پین 22 | NC — Not connected |
| پین 23 | NC — Not connected |
| پین 24 | NC — Not connected |
| پین 25 | NC — Not connected |
| پین 26 | NC — Not connected |
| پین 27 | NC — Not connected |
| پین 28 | NC — Not connected |
| پین 29 | NC — Not connected |
| پین 30 | NC — Not connected |
| پین 31 | NC — Not connected |
| پین 32 | NC — Not connected |
کاربردهای معمول
LT8646SIV#WPBF مناسب است برای 6 کاربردs: Automotive Always-On Power Rails, Industrial 24 V / 48 V Bus Converters, Battery-Powered Portable Equipment, Distributed 12 V Point-of-Load Regulation, Automotive Infotainment & ADAS Power, General-Purpose Wide-Input Step-Down.
Automotive Always-On Power Rails
The LT8646SIV#WPBF is well suited to automotive always-on rails because its 65 V input withstands 24 V load-dump transients, its 2.5 µA Burst Mode quiescent current minimizes battery drain when the vehicle is parked, and its 96% peak efficiency reduces thermal load in always-powered modules. Silent Switcher 2 architecture meets CISPR 25 Class 5 EMI without external shielding. The 32-pin LQFN exposed-pad package dissipates full 8 A at 125°C junction on a 4-layer PCB.
پیشنهادی
Industrial 24 V / 48 V Bus Converters
The LT8646SIV#WPBF's 3.4 V to 65 V input range accepts 24 V industrial bus rails directly and 48 V factory-automation buses with substantial margin. Delivering 8 A continuous at 96% peak efficiency, the part powers downstream point-of-load converters in PLCs, motor drives, and industrial sensors. Silent Switcher 2 architecture eases compliance with EN 55011/CISPR 11 industrial EMI standards. The exposed pad simplifies thermal management in sealed industrial enclosures.
پیشنهادی
Battery-Powered Portable Equipment
The LT8646SIV#WPBF's 2.5 µA Burst Mode quiescent current makes it ideal for portable battery-powered equipment such as handheld instruments, test gear, and field-deployed sensors. Its wide 3.4 V to 65 V input allows direct connection to multi-cell battery stacks or USB-PD sources. The 200 kHz to 2.2 MHz programmable switching frequency permits small inductors in compact enclosures. Efficiency of 96% extends runtime on a single battery charge.
پیشنهادی
Distributed 12 V Point-of-Load Regulation
The LT8646SIV#WPBF excels at distributed 12 V point-of-load regulation in servers, telecom shelves, and networking hardware. Its 8 A output capability with 96% efficiency and Silent Switcher 2 low-EMI signature allows dense placement near FPGAs, ASICs, and DSP cores without polluting adjacent analog rails. The 32-pin LQFN 6×4 mm footprint conserves board area while supporting 8 A sustained load without external heatsinking.
پیشنهادی
Automotive Infotainment & ADAS Power
The LT8646SIV#WPBF's AEC-Q100 automotive qualification and Silent Switcher 2 architecture make it ideal for infotainment head units, instrument clusters, and ADAS compute modules. The wide 65 V input accepts transient peaks on the 12 V battery rail, while 2.5 µA quiescent current supports low-power modes. The high switching frequency (up to 2.2 MHz) keeps inductors small enough to fit beside radio and camera PCBs.
پیشنهادی
General-Purpose Wide-Input Step-Down
The LT8646SIV#WPBF is broadly applicable to any 3.4 V to 65 V to lower-voltage step-down requirement: USB-PD sources, 24 V LED drivers, test equipment rails, and solar charge controllers. With 0.97 V to 64 V adjustable output, the part covers logic rails (1.0 V, 1.8 V, 3.3 V, 5 V), PoL voltages (12 V, 15 V), and even 24 V/36 V intermediate buses. The integrated top/bottom MOSFETs reduce BOM count by half vs. external-FET designs.
پیشنهادی
خلاصه محصولات پیشنهادی
داده‌های مرجع مهندسی برای LT8646SIV#WPBF — مقایسه، راهنمای طراحی و اطلاعات انطباق.
راهنمای انتخاب
مقایسه با جایگزین‌ها
| پارامتر | این محصول | LT8646SIV#WTRPBF | LT8645SIV#WPBF | LT8646SIV | LT8646SJV#WPBF | LT8645SIV#WTRPBF |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 32-pin LQFN (6x4 mm) EP | 32-pin LQFN (6x4 mm) EP - same | 32-pin LQFN (6x4 mm) EP - same | 32-pin LQFN (6x4 mm) EP - same | 32-pin LQFN (6x4 mm) EP - same | 32-pin LQFN (6x4 mm) EP - same |
| Maximum Output Current | 8 A | 8 A | 6 A | 8 A | 8 A | 6 A |
| Input Voltage Range | 3.4 V to 65 V | 3.4 V to 65 V | 3.4 V to 65 V | 3.4 V to 65 V | 3.4 V to 65 V | 3.4 V to 65 V |
| Output Voltage Range | 0.97 V to 64 V | 0.97 V to 64 V | 0.97 V to 64 V | 0.97 V to 64 V | 0.97 V to 64 V | 0.97 V to 64 V |
| Operating Temperature Range | -40°C to +125°C | -40°C to +125°C | -40°C to +125°C | -40°C to +125°C | 0°C to +125°C | -40°C to +125°C |
| Switching Frequency Range | 200 kHz to 2.2 MHz | 200 kHz to 2.2 MHz | 200 kHz to 2.2 MHz | 200 kHz to 2.2 MHz | 200 kHz to 2.2 MHz | 200 kHz to 2.2 MHz |
| Quiescent Current (Burst Mode) | 2.5 µA | 2.5 µA | 2.5 µA | 2.5 µA | 2.5 µA | 2.5 µA |
| Packaging Format | Tray | Tape and Reel | Tray | Tray | Tray | Tape and Reel |
تفاوت‌های کلیدی
- Integrated Silent Switcher 2 bypass capacitors (در مقابلLT8645SIV#WPBF (6 A sibling))
- 8 A continuous output vs 6 A (در مقابلLT8645SIV#WPBF)
- 65 V wide-Vin operation (در مقابلTI LMR33630 (36 V / 3 A))
- AEC-Q100 automotive qualification (در مقابلTI LMR33630 (non-automotive qualified))
یادداشت‌های طراحی
Estimated: At full 8 A load with VIN=24 V to VOUT=5 V, power dissipation is (24-5)*8 = 152 W on the internal MOSFETs (efficiency ~96% implies ~1.4 W loss). With the 32-pin LQFN exposed-pad θJA of ~25°C/W on a 4-layer JEDEC board, the junction temperature rises ~35°C above ambient. Ensure at least 1 cm² of unbroken copper under the exposed pad connected to multiple inner ground layers for reliable operation at 8 A continuous load up to 125°C ambient.
Place input ceramic capacitors (2× 4.7 µF X7R 100 V minimum) within 2 mm of the VIN and GND pins. Use a low-ESR 100 µF output capacitor and a 22 µH to 47 µH power inductor sized for the chosen switching frequency. The Silent Switcher 2 architecture benefits from a symmetrical ground-return layout; route the SW node return directly under the inductor with a continuous ground pour. Minimize the loop area from VIN through BST to SW and back to GND.
Silent Switcher 2 architecture already suppresses EMI significantly; for CISPR 25 Class 5 compliance in automotive applications, add a small ferrite bead on the input supply rail near the IC and ensure a continuous ground ring around the SW and BST traces. Avoid routing analog signal traces near the SW node. Shielding is generally not required when the layout guidelines in the LT8645S/LT8646S datasheet are followed.
Do not allow VIN to fall below the output voltage while EN is high - the LT8646SIV lacks reverse-input protection and the internal body diodes can conduct from VOUT back to VIN. Add a blocking diode or power-path ORing FET if the input can be removed while the output is held up by another rail. Ensure the BST capacitor is a low-leakage X7R type and that the TR/SS capacitor is correctly sized to limit inrush current at startup.
Burst Mode operation reduces quiescent current to 2.5 µA but introduces output voltage ripple - disable Burst Mode (tie SYNC high) if the load requires sub-mV ripple. Pulse-skipping mode offers a balance between low-IQ and clean output. For applications sensitive to audible noise, keep switching frequency above 20 kHz (LT8646SIV default range is 200 kHz to 2.2 MHz so this is inherently satisfied).
اطلاعات انطباق
AEC-Q100 qualified per Arrow listing. RoHS compliance indicated by #WPBF suffix per Analog Devices ordering nomenclature.
