IC manufacturers Analog Devices

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Analog Devices LT8644S | Demoboard DC2779A

8V, 16A Synchronous Step-Down Silent Switcher 2

Overview

TopologyBuck Converter
Input voltage2.7-8 V
Switching frequency1950-2050 kHz
Output 11.22 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

Products

Order Code Data­sheet Simu­lation Downloads Status Product seriesL
(mm)
f
(mm)
Z @ 100 MHz
(Ω)
Zmax
(Ω)
Test Condition ZmaxIR
(mA)
Z @ 1 GHz
(Ω)
H
(mm)
TypePins (Value)
(pcs)
RowsGenderPackaging Samples
74279221100SPEC
9 files Active i| Production is active. Expected lifetime: >10 years.WE-MPSB EMI Multilayer Power Suppression Bead 3.2 10 41 2178 MHz 10500 28 1.1 High Current
62000621121SPEC
6 files Active i| Production is active. Expected lifetime: >10 years.WR-PHD 2.00 mm THT Dual Pin Header 6 2000 Straight 6 Dual Pin Header Bag
702935000SPEC
3 files Active i| Production is active. Expected lifetime: >10 years.WA-SNSR Self-Retaining Spacer 12.7 4.8
60800213421SPEC
3 files Active i| Production is active. Expected lifetime: >10 years.WR-PHD 2.00 mm Jumper with Test Point 3000 2 Jumper Bag
Order Code Data­sheet Simu­lation
74279221100SPEC
62000621121SPEC
702935000SPEC
60800213421SPEC
Samples
Order Code Data­sheet Simu­lation Downloads Status Product seriesL
(mm)
f
(mm)
Z @ 100 MHz
(Ω)
Zmax
(Ω)
Test Condition ZmaxIR
(mA)
Z @ 1 GHz
(Ω)
H
(mm)
TypePins (Value)
(pcs)
RowsGenderPackaging Samples