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LTC7801 4 V to 140 V Input Step-Down DC/DC Controllers

ADI’s PMIC for automotive, industrial, and telecommunication power systems

Image of Analog Devices' LTC7801 4 V to 140 V Input Step-Down DC/DC Controller Analog Devices' LTC7801 is a high-performance step-down (buck) switching regulator DC/DC controller. This controller drives an all N-channel synchronous power MOSFET stage that can operate from input voltages up to 140 V. A constant frequency current mode architecture allows a phase-lockable frequency of up to 850 kHz.

The gate drive voltage can be programmed from 5 V to 10 V to allow the use of logic or standard-level FETs to maximize efficiency. An integrated switch in the top gate driver eliminates the need for an external bootstrap diode. An internal charge pump allows for 100% duty cycle operation.

The low 40 μA no-load quiescent current extends operating run time 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 LTC7801 features a precision 0.8 V reference and power good output indicator. The output voltage can be programmed between 0.8 V to 60 V using external resistors.

This controller comes in DFN or TSSOP packages that have operating temperature range of -40°C to +125°C or +150°C. The LTC7801 was designed for automotive, industrial, and telecommunication power systems.

Typical Applications

Image of Analog Devices' High Efficiency High Voltage 12V Output Step-Down Regulator

Image of Analog Devices' Efficiency and Power Loss vs Load Current

Features
  • Output voltage range: 0.8 V to 60 V
  • VIN range: 4 V to 140 V (150 V, abs max)
  • Adjustable gate drive level: 5 V to 10 V (OPTI-DRIVE)
  • Low operating IQ: 40 μA (shutdown = 10 μA)
  • 100% duty cycle operation
  • No external bootstrap diode required
  • Selectable gate drive UVLO thresholds
  • Onboard LDO or external NMOS LDO for DRVCC
  • EXTVCC LDO powers drivers from VOUT
  • Phase-lockable frequency (75 kHz to 850 kHz)
  • Programmable fixed frequency (50 kHz to 900 kHz)
  • Selectable continuous, pulse-skipping, or low ripple Burst Mode® operation at light loads
  • Adjustable burst clamp
  • Power good output voltage monitor
  • Programmable input overvoltage lockout
Applications
  • Automotive, industrial, and telecommunication power systems
  • High voltage battery operated systems

Evaluation Board

ImageManufacturer Part NumberDescriptionMain PurposeOutputs and TypeVoltage - OutputAvailable QuantityView Details
LTC7801EUFD DEMO BOARD VIN = 16VDC2641ALTC7801EUFD DEMO BOARD VIN = 16VDC/DC, Step Down1, Non-Isolated12V10 - ImmediateView Details

LTC7801 Step-Down DC/DC Controllers

ImageManufacturer Part NumberDescriptionOperating TemperatureMounting TypePackage / CaseAvailable QuantityView Details
IC REG CTRLR SYNC BUCK 24TSSOPLTC7801EFE#PBFIC REG CTRLR SYNC BUCK 24TSSOP-40°C ~ 125°C (TJ)Surface Mount24-TSSOP (0.173", 4.40mm Width) Exposed Pad110 - ImmediateView Details
IC REG CTRLR SYNC BUCK 24TSSOPLTC7801EFE#TRPBFIC REG CTRLR SYNC BUCK 24TSSOP-40°C ~ 125°C (TJ)Surface Mount24-TSSOP (0.173", 4.40mm Width) Exposed Pad685 - ImmediateView Details
IC REG CTRLR SYNC BUCK 24QFNLTC7801EUFD#PBFIC REG CTRLR SYNC BUCK 24QFN-40°C ~ 125°C (TJ)Surface Mount24-WFQFN Exposed Pad1868 - ImmediateView Details
IC REG CTRLR SYNC BUCK 24QFNLTC7801EUFD#TRPBFIC REG CTRLR SYNC BUCK 24QFN-40°C ~ 125°C (TJ)Surface Mount24-WFQFN Exposed Pad0View Details
IC REG CTRLR SYNC BUCK 24TSSOPLTC7801HFE#PBFIC REG CTRLR SYNC BUCK 24TSSOP-40°C ~ 150°C (TJ)Surface Mount24-TSSOP (0.173", 4.40mm Width) Exposed Pad950 - ImmediateView Details
Published: 2018-07-24