LTC7805
Info : RECOMMENDED FOR NEW DESIGNS
searchIcon
cartIcon

LTC7805

40V Low IQ, Dual, 2-Phase 100% Duty Cycle Synchronous Step-Down Controller

Show More showmore-icon

Info : RECOMMENDED FOR NEW DESIGNS tooltip
Info : RECOMMENDED FOR NEW DESIGNS tooltip
Part Details
Part Models 4
1ku List Price Starting From $2.93
Features
  • Wide Input Voltage Range: 4.5V to 40V
  • Wide Output Voltage Range: 0.8V to 40V
  • Low Operating IQ
    • 14μA (14V to 3.3V, Channel 1 On)
  • PassThru/100% Duty Cycle Capable
  • Spread Spectrum Operation
  • RSENSE or DCR Current Sensing
  • Out-of-Phase Controllers Reduce Required Input Capacitance and Power Supply Induced Noise
  • Programmable Fixed Frequency (100kHz to 3MHz)
  • Phase-Lockable Frequency (100kHz to 3MHz)
  • Selectable Continuous, Pulse-Skipping, or Low Ripple, Burst Mode® Operation at Light Loads
  • Power Good Output Voltage Monitors
  • Internal LDO Powers Gate Drive from VIN or EXTVCC
  • Low Shutdown IQ: 1.5μA
  • Side Wettable 28-Lead 4mm × 5mm QFN Package
  • AEC-Q100 Qualified for Automotive Applications
Additional Details
show more Icon

The LTC7805 is a high performance dual step-down synchronous DC/DC switching regulator controller that drives all N-channel power MOSFET stages. Constant frequency current mode architecture allows a phase-lockable switching frequency of up to 3MHz. The LTC7805 operates from a wide 4.5V to 40V input supply range. Power loss and supply noise are minimized by operating the two controller output stages out-of-phase.

The very low no-load quiescent current extends operating runtime in battery powered systems. OPTI-LOOP compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The LTC7805 features a precision 0.8V reference and power good output indicators. The MODE pin selects among Burst Mode operation, pulse-skipping mode, or continuous inductor current mode at light loads.

The LTC7805 additionally features spread spectrum operation which significantly reduces the peak radiated and conducted noise on both the input and output supplies, making it easier to comply with electromagnetic interference (EMI) standards.

APPLICATIONS

  • Automotive and Transportation
  • Industrial
  • Military / Avionics
Part Models 4
1ku List Price Starting From $2.93

close icon
Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LTC7805JUFDM#WPBF
  • HTML
  • HTML
LTC7805JUFDM#WTRPBF
  • HTML
  • HTML
LTC7805RUFDM#PBF
  • HTML
  • HTML
LTC7805RUFDM#TRPBF
  • HTML
  • HTML
Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

reference details image

DC3138A

Dual 12VIN to 36VIN, 5V/15A and 12V/10A Output Synchronous Buck Converter with Spread Spectrum

zoom

DC3138A

Dual 12VIN to 36VIN, 5V/15A and 12V/10A Output Synchronous Buck Converter with Spread Spectrum

Dual 12VIN to 36VIN, 5V/15A and 12V/10A Output Synchronous Buck Converter with Spread Spectrum

Product Detail

Demonstration circuit 3138A is a dual output step-down DC/DC converter that operates over a 12V to 36V input voltage range. It provides two outputs of 5V at 15A and 12V at 10A, and features the LTC7805 dual output synchronous step-down controller.

Key features of this board include:

  • FREQUENCY jumper for spread spectrum or external clock
  • EXTVCC jumper to use VOUT2, EXTVCC, or other derived VCC
  • MODE jumper that allows the converter to run in FCM, pulse-skipping, or Burst Mode® operation
  • PGOOD signals for each output

The two channels can be paralleled for higher output current. See the data sheet for more information on setting up the board for paralleling the two outputs.

The LTC7805 data sheet gives a complete description of the device, its operation and application information. The data sheet must be read in conjunction with the demo manual prior to working on or modifying demo circuit 3138A.

Tools & Simulations

Tools & Simulations 2

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Recently Viewed