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Analog Devices LT8643SA | Demoboard EVAL-LT8643SA-AZ
LT8643SA| 42V, 6A Synchronous Step-Down Silent Switcher 2
Overview
| Topology | Buck Converter |
| Input voltage | 5.8-42 V |
| Switching frequency | 200-3000 kHz |
| Output 1 | 5 V / 6 A |
Description
The demonstration circuit EVAL-LT8643SA-AZ is a 42V, 6A micropower synchronous step-down second generation Silent Switcher® with spread spectrum frequency modulation featuring the LT8643SA. The demo board is designed for 5V output from a 5.8V to 42V input. The wide input range allows a variety of input sources, such as automotive batteries and industrial supplies. The LT8643SA is a compact, ultra-low emission, high efficiency, and high speed synchronous monolithic step-down switching regulator. The integrated bypass capacitors optimize all the fast current loops and make it easier to minimize EMI/EMC emissions by reducing layout sensitivity. Selectable spread spectrum mode can further improve EMI/EMC performance. Ultra-low quiescent current in Burst Mode® operation achieves high efficiency at very light loads. Fast minimum on-time of 30ns enables high VIN to low VOUT conversion at high frequency.
Features
- Silent Switcher ®2 Architecture○ Ultralow EMI Emissions on Any PCB○ Eliminates PCB Layout Sensitivity○ Internal Bypass Capacitors Reduce Radiated EMI○ Optional Spread Spectrum Modulation
- High Efficiency at High Frequency○ Up to 96% Efficiency at 1MHz, 12VIN to 5VOUT○ Up to 95% Efficiency at 2MHz, 12VIN to 5VOUT
- Wide Input Voltage Range: 3.4V to 42V
- Output Voltage Range: 0.97V to 10V(LT8640S/LT8643S); 0.97V to (VIN – 0.5V) (LT8640SA/LT8643SA)
- 6A Maximum Continuous, 7A Peak Output
- Ultralow Quiescent Current Burst Mode® Operation○ 2.5µA IQ Regulating 12VIN to 3.3VOUT (LT8640S/LT8640SA)○ Output Ripple < 10mVP-P
- External Compensation: Fast Transient Response and Current Sharing (LT8643S)
- Robust High VOUT Operation (LT8640SA/LT8643SA)○ Safely Tolerates High Reverse Current
- Fast Minimum Switch On-Time: 30ns
- Low Dropout Under All Conditions: 100mV at 1A
- Forced Continuous Mode
- Adjustable and Synchronizable: 200kHz to 3MHz
- Output Soft-Start and Tracking
- Small 24-Lead 4mm × 4mm LQFN Package
- AEC-Q100 Qualified for Automotive Applications
Typical applications
More information
Products
| Order Code | Datasheet | Simulation | Downloads | Status | Product series | Z @ 100 MHz (Ω) | Zmax (Ω) | Test Condition Zmax | IR (mA) | Z @ 1 GHz (Ω) | H (mm) | Type | Pins (pcs) | Rows | Gender | Packaging | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | 74279226101 | SPEC | 10 files | Active i| Production is active. Expected lifetime: >10 years. | WE-MPSB EMI Multilayer Power Suppression Bead | 100 | 160 | 1100 MHz | 8000 | 150 | 2.3 | High Current | – | – | – | – | ||
 | 60800213421 | SPEC | – | 3 files | Active i| Production is active. Expected lifetime: >10 years. | WR-PHD 2.00 mm Jumper with Test Point | – | – | – | 3000 | – | – | – | 2 | – | Jumper | Bag | |
 | 62000821121 | SPEC | – | 7 files | Active i| Production is active. Expected lifetime: >10 years. | WR-PHD 2.00 mm THT Dual Pin Header | – | – | – | 2000 | – | – | Straight | 8 | Dual | Pin Header | Bag |
| Order Code | Datasheet | Simulation | |
|---|---|---|---|
| 74279226101 | SPEC | |
| 60800213421 | SPEC | – |
| 62000821121 | SPEC | – |
| Samples |
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| Order Code | Datasheet | Simulation | Downloads | Status | Product series | Z @ 100 MHz (Ω) | Zmax (Ω) | Test Condition Zmax | IR (mA) | Z @ 1 GHz (Ω) | H (mm) | Type | Pins (pcs) | Rows | Gender | Packaging | Samples |
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