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Overview
| Topology | Buck Converter |
| Input voltage | 2.7-8 V |
| Switching frequency | 1950-2050 kHz |
| Output 1 | 1.22 V / 16 A |
Description
Demonstration circuit 2779A is an 8V, 16A synchronous step-down Silent Switcher® 2 with spread spectrum frequency modulation featuring the LT8644S. The demo board is designed for 1.2V output from a 2.7V to 8V input. The LT8644S is a compact, ultralow emission, high efficiency, and high speed synchronous monolithic stepdown switching regulator. The integrated bypass capacitors optimize all the fast current loops and make it easier to minimize EMI emissions by reducing layout sensitivity. Selectable spread spectrum mode further improves EMI performance, making it perfect solution to the noise sensitive applications.Peak current mode control with minimum on-time of as low as 20ns allows high step-down conversion even at high frequency. The LT8644S switching frequency can be programmed either via an external resistor or an external clock over a 300kHz to 3.5MHz range. The default frequency of demo circuit 2779A is 2MHz.
Features
- Silent Switcher®2 Architecture
- Ultralow EMI Emissions on Any PCB
- Internal Bypass Capacitors Reduce Radiated EMI
- Optional Spread Spectrum Modulation
- High Efficiency at High Frequency
- Up to 94% Efficiency at 2MHz, 3.3VIN to 1.2VOUT
- Up to 93% Efficiency at 2MHz, 5VIN to 1.2VOUT
- PVIN Range: 1.5V to 8V, SVIN Range: 2.7V to 8V
- VOUT Range: 0.6V to VIN
- Reference Accuracy: ±0.8% Over Temperature
- PolyPhase® Operation: Up to 12 Phases
- Fast Transient Response with External Compensation
- Forced Continuous Mode Operation
- Low Quiescent Current Burst Mode® Operation
- 180μA IQ Regulating 5VIN to 1.2VOUT
- Output Ripple < 10mVP-P
- Fast Minimum Switch On-Time: 20ns
- Adjustable and Synchronizable: 300kHz to 3.5MHz
- Output Soft-Start and Power Good
- Small 24-Lead 4mm × 4mm LQFN Package
- AEC-Q100 Qualified for Automotive Applications
Typical applications
- Industrial Supplies, General Purpose Step-Down Conversion
- Automotive
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | f(mm) | Z @ 100 MHz(Ω) | Zmax(Ω) | Test Condition Zmax | IR(mA) | Z @ 1 GHz(Ω) | H(mm) | Type | Pins | Mount | L(mm) | Working Voltage(V (AC)) | Operating Temperature | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-MPSB EMI Multilayer Power Suppression Bead, –, 10 Ω | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-MPSB EMI Multilayer Power Suppression Bead | – | Impedance @ 100 MHz10 Ω | Maximum Impedance41 Ω | Maximum Impedance2178 MHz | Rated Current10500 mA | Impedance @ 1 GHz28 Ω | Height1.1 mm | TypeHigh Current | – | MountSMT | Length3.2 mm | – | Operating Temperature -55 °C up to +125 °C | ||||
 | WA-SNSR Self-Retaining Spacer, 4.8 mm, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWA-SNSR Self-Retaining Spacer | Drilling in Panel4.8 mm | – | – | – | – | – | – | – | – | – | Length12.7 mm | – | Operating Temperature -30 °C up to +85 °C | |||
 | WR-PHD Jumper, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-PHD Jumper | – | – | – | – | Rated Current3000 mA | – | – | – | Pins2 | – | – | Working Voltage200 V (AC) | Operating Temperature -25 °C up to +105 °C | |||
 | WR-PHD Pin Header, –, – | Simulation– | Downloads7 files | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-PHD Pin Header | – | – | – | – | Rated Current2000 mA | – | – | TypeStraight | Pins6 | MountTHT | Length6 mm | Working Voltage200 V (AC) | Operating Temperature -40 °C up to +105 °C |