LTC7805
RECOMMENDED FOR NEW DESIGNS40V Low IQ, Dual, 2-Phase 100% Duty Cycle Synchronous Step-Down Controller
- Part Models
- 4
- 1ku List Price
- Starting From $3.71
Overview
- 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
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
Documentation
Data Sheet 1
User Guide 1
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| LTC7805JUFDM#WPBF | 28-Lead QFN (4mm x 5mm, Plastic Side Wettable) | ||
| LTC7805JUFDM#WTRPBF | 28-Lead QFN (4mm x 5mm, Plastic Side Wettable) | ||
| LTC7805RUFDM#PBF | 28-Lead QFN (4mm x 5mm, Plastic Side Wettable) | ||
| LTC7805RUFDM#TRPBF | 28-Lead QFN (4mm x 5mm, Plastic Side Wettable) |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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Tools & Simulations
LTspice
Models for the following parts are available in LTspice:
- LTC7805
LTpowerCAD 1
Design tools for the following parts are available in LTpowerCAD:
- LTC7805
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® 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
Dual 12VIN to 36VIN, 5V/15A and 12V/10A Output Synchronous Buck Converter with Spread Spectrum