IC manufacturers Analog Devices

IC manufacturers (99)

Analog Devices LT8640

42V, 5A Synchronous Step-Down Silent Switcher with 2.5μA Quiescent Current

Overview

TopologyBuck Converter
Input voltage3.4-42 V
Switching frequency1000-3000 kHz
Output 15 V / 5 A
IC revisionE

Description

The LT8640/LT8640-1 step-down regulator features Silent Switcher architecture designed to minimize EMI emissions while delivering high efficiency at frequencies up to 3MHz. An ultralow 2.5µA quiescent current—with the output in full regulation—enables applications requiring highest efficiency at very small load currents.The LT8640/LT8640-1 allows high VIN to low VOUT conversion at high frequency with a fast minimum top switch on-time of 30ns. The SYNC/MODE pin selects between Burst Mode operation, spread spectrum mode, synchronization to an external clock, and either pulse-skipping (LT8640) or forced continuous mode (LT8640-1).

Features

  • Silent Switcher® Architecture○ Ultralow EMI Emissions○ Spread Spectrum Frequency 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
  • 5A Maximum Continuous Output, 7A Peak Transient Output
  • Ultralow Quiescent Current Burst Mode® Operation○ 2.5µA IQ Regulating 12VIN to 3.3VOUT○ Output Ripple < 10mVP-P
  • Fast Minimum Switch On-Time: 30ns
  • Low Dropout Under All Conditions: 100mV at 1A
  • Forced Continuous Mode (LT8640-1 Only)
  • Safely Tolerates Inductor Saturation in Overload
  • Adjustable and Synchronizable: 200kHz to 3MHz
  • Peak Current Mode Operation
  • Output Soft-Start and Tracking
  • Small 18-Lead 3mm × 4mm QFN and Side Wettable QFN
  • AEC-Q100 Qualified for Automotive Applications

Typical applications

Products

Order Code Data­sheet Simu­lation Downloads Status Product seriesL
(µH)
IRP,40K
(A)
ISAT,10%
(A)
ISAT,30%
(A)
RDC max.
(mΩ)
fres
(MHz)
MountZ @ 100 MHz
(Ω)
Zmax
(Ω)
Test Condition ZmaxIR
(mA)
Z @ 1 GHz
(Ω)
H
(mm)
Type Samples
74437346015SPEC

PCN pending

Due to a pending PCN there will be a new datasheet revision issued for this order code soon. Please find the actual as well based on valid PCN date the new revision datasheet below. If you have further questions please get in contact with our sales staff.

8 files Active i| Production is active. Expected lifetime: >10 years.WE-LHMI SMT Power Inductor 1.5 9.1 11.2 27.6 15 45 SMT 2.8
74279226101SPEC
9 files Active i| Production is active. Expected lifetime: >10 years.WE-MPSB EMI Multilayer Power Suppression Bead 6 SMT 100 160 1100 MHz 8000 150 2.3 High Current
Order Code Data­sheet Simu­lation
74437346015SPEC

PCN pending

Due to a pending PCN there will be a new datasheet revision issued for this order code soon. Please find the actual as well based on valid PCN date the new revision datasheet below. If you have further questions please get in contact with our sales staff.

74279226101SPEC
Samples
Order Code Data­sheet Simu­lation Downloads Status Product seriesL
(µH)
IRP,40K
(A)
ISAT,10%
(A)
ISAT,30%
(A)
RDC max.
(mΩ)
fres
(MHz)
MountZ @ 100 MHz
(Ω)
Zmax
(Ω)
Test Condition ZmaxIR
(mA)
Z @ 1 GHz
(Ω)
H
(mm)
Type Samples