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LTC3851

Features: `Wide VIN Range: 4V to 38V Operation`RSENSE or DCR Current Sensing`±1% Output Voltage Accurac`Phase-Lockable Fixed Frequency: 250kHz to 750kHz`Dual N-Channel MOSFET Synchronous Drive`Very Low Dropout Operation: 99% Duty Cycle`Adjustable Output Voltage Soft-Start or Tracking`Output Curren...

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SeekIC No. : 004402391 Detail

LTC3851: Features: `Wide VIN Range: 4V to 38V Operation`RSENSE or DCR Current Sensing`±1% Output Voltage Accurac`Phase-Lockable Fixed Frequency: 250kHz to 750kHz`Dual N-Channel MOSFET Synchronous Drive`Very ...

LTC3851 Data Sheet

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Part Number:
LTC3851
Supply Ability:
5000

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  • 1~5000
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  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Product Details

Description



Features:

`Wide V IN Range: 4V to 38V Operation
`RSENSE  or DCR Current Sensing
`±1% Output Voltage Accurac
`Phase-Lockable Fixed Frequency: 250kHz to 750kHz
`Dual N-Channel MOSFET Synchronous Drive
`Very Low Dropout Operation: 99% Duty Cycle
`Adjustable Output Voltage Soft-Start or Tracking
`Output Current Foldback Limiting
`Output Overvoltage Protection
`5V Internal Regulator
`OPTI-LOOP®  Compensation Minimizes COUT
`Selectable Continuous, Pulse-Skipping or 
`Operation at Light Loads
   Burst Mode
`Low Shutdown I Q: 20A
`VOUT  Range® : 0.8V to 5.5V
`16-Lead Narrow SSOP or 3mm  3mm QFN Package


Application

·Automotive Systems
·Telecom Systems
·Industrial Equipment
·Distributed DC Power Systems


Pinout

Connection Diagram Connection Diagram


Specifications

Input Supply Voltage (VIN ) .........................40V to -0.3
Topside Driver Voltage (BOOST) ................46V to -0.3
Switch Voltage (SW) .....................................40V to -5
INTVCC, (BOOST C SW), RUN ......................6V to -0.
TK/SS, ILIM............................................INTVCC  to -0.3
SENSE+, SENSE - ..........................................6V to -0.3
MODE/PLLIN, FREQ/PLLFLTR ...............INTVCC to -0.3
ITH , V FB Voltages ..........................................3V to -0.3
INTVCC  Peak Output Current ..................................50mA
Operating Temperature Range (Note 2)....-40 to 85
Junction Temperature (Note 3) .............................125
Storage Temperature Range
 GN .....................................................-65 to 150
 UD .........................................................-65 to 125
Lead Temperature (Soldering, 10 sec)
 GN ....................................................................300




Description

The LTC® 3851 is a high performance synchronous step-down switching regulator controller that drives an all N-hannel synchronous power MOSFET stage. A con stant frequency current mode architecture allows a phase-lockable frequency of up to 750kHz.

OPTI-LOOP compensation allows the transient response to be optimized over a wide range of output capacitance and R values. The LTC3851 features a precision 0.8V reference that is compatible with a wide 4V to 38V input supply range.

The TK/SS pin ramps the output voltage during start-up. Current foldback limits MOSFET heat dissipation during short-it conditions. The MODE/PLLIN pin of LTC3851 selects among Burst Mode operation, pulse skipping mode or continuous inductor rrent mode at light loads and allows the IC to be synchronized to an external clock.




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