LTC7805

RECOMMENDED FOR NEW DESIGNS

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

Data Sheet (Rev. A) Product Selection Table
Part Models
4
1ku List Price
Starting From $2.93
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Part Details

  • 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
LTC7805
40V Low IQ, Dual, 2-Phase 100% Duty Cycle Synchronous Step-Down Controller
LTC7805 Application Circuit LTC7805 Efficiency and Power Loss vs Load Current LTC7805 Pin Configuration
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Documentation

Data Sheet 1

User Guide 1

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Hardware Ecosystem

Parts Product Life Cycle Description
High Voltage Hot Swap Controllers 1
LTC4238
LAST TIME BUY

High Voltage High Current Hot Swap Controller
Surge Stopper, Overvoltage, and Overcurrent Protection 1
LTC4381
RECOMMENDED FOR NEW DESIGNS Low Quiescent Current eFuse with Surge Protection
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Tools & Simulations

LTspice 1

Models for the following parts are available in LTspice:

  • LTC7805

LTpowerCAD 1

LTspice

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.

LTpowerCAD

LTpowerCAD® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.

Evaluation Kits

eval board
schematic 1
schematic 2
schematic 3
DC3138A

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

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Product Details

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.
DC3138A
Dual 12VIN to 36VIN, 5V/15A and 12V/10A Output Synchronous Buck Converter with Spread Spectrum
DC3138A Evaluation Board DC3138A Evaluation Board - Top View DC3138A Evaluation Board - Bottom View

Latest Discussions

2 Years Ago
RE: Switching power loss
2 Years Ago
RE: LTC7805 over current behavior on LTSpice
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