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Overview
| Topology | Buck Converter |
| Input voltage | 2.8-18 V |
| Switching frequency | 1925-2075 kHz |
| Output 1 | 1.2 V / 10 A |
Description
Demonstration circuit 2560A is a 18V, 10A synchronous step-down Silent Switcher®2 with spread spectrum frequency modulation featuring the LT®8642S. The demo board is designed for 1.2V output from a 2.8V to 18Vinput. The LT8642S is a compact, ultralow 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. Fast minimum on-time of 20ns enables high VIN to low VOUT conversion at highfrequency.
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 3.3VOUT
- Up to 95% Efficiency at 2MHz, 12VIN to 3.3VOUT
- Wide Input Voltage Range: 2.8V to 18V
- 10A Output Current
- External Compensation: Fast Transient Response and Current Sharing
- Low Quiescent Current Burst Mode® Operation
- 240µA IQ Regulating 12VIN to 1.2VOUT
- Output Ripple < 10mVP-P
- Fast Minimum Switch On-Time: 25ns
- Low Dropout Under All Conditions: 50mV at 1A
- Forced Continuous Mode
- Adjustable and Synchronizable: 200kHz to 3MHz
- Output Soft-Start and Power Good
- Small 24-Lead 4mm × 4mm LQFN Package
Typical applications
- Server Power Applications
- General Purpose Step-Down
More information
Products
| Order Code | Datasheet | Simulation | Downloads | Product series | L (mm) | f (mm) | Z @ 100 MHz (Ω) | Zmax (Ω) | Test Condition Zmax | IR (mA) | Z @ 1 GHz (Ω) | H (mm) | Type | Pins (pcs) | Rows | Gender | Packaging | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | 74279228600 | SPEC | 8 files | WE-MPSB EMI Multilayer Power Suppression Bead | 1.6 | – | 60 | 99 | 458 MHz | 5100 | 74 | 0.8 | High Current | – | – | – | – | ||
 | 62000821121 | SPEC | – | 6 files | WR-PHD 2.00 mm THT Dual Pin Header | 8 | – | – | – | – | 2000 | – | – | Straight | 8 | Dual | Pin Header | Bag | |
 | 702935000 | SPEC | – | 3 files | WA-SNSR Self-Retaining Spacer | 12.7 | 4.8 | – | – | – | – | – | – | – | – | – | – | – | |
 | 60800213421 | SPEC | – | 3 files | WR-PHD 2.00 mm Jumper with Test Point | – | – | – | – | – | 3000 | – | – | – | 2 | – | Jumper | Bag |
| Order Code | Datasheet | Simulation | |
|---|---|---|---|
| 74279228600 | SPEC | |
| 62000821121 | SPEC | – |
| 702935000 | SPEC | – |
| 60800213421 | SPEC | – |
| Samples |
|---|
| Order Code | Datasheet | Simulation | Downloads | Product series | L (mm) | f (mm) | Z @ 100 MHz (Ω) | Zmax (Ω) | Test Condition Zmax | IR (mA) | Z @ 1 GHz (Ω) | H (mm) | Type | Pins (pcs) | Rows | Gender | Packaging | Samples |
|---|