LTC1778
LTC1778-1
Info: : PRODUCTION
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LTC1778
LTC1778-1

Wide Operating Range, No RSENSE Step-Down Controller

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Info: : PRODUCTION tooltip
Info: : PRODUCTION tooltip
Part Details
Part Models 6
1ku List Price Starting From $3.25
Features
  • No Sense Resistor Required
  • True Current Mode Control
  • Optimized for High Step-Down Ratios
  • tON(MIN) <=100ns
  • Extremely Fast Transient Response
  • Stable with Ceramic COUT
  • Dual N-Channel MOSFET Synchronous Drive
  • Power Good Output Voltage Monitor (LTC1778)
  • Adjustable On-Time (LTC1778-1)
  • Wide VIN Range: 4V to 36V
  • ±1% 0.8V Voltage Reference
  • Adjustable Current Limit
  • Adjustable Switching Frequency
  • Programmable Soft-Start
  • Output Overvoltage Protection
  • Optional Short-Circuit Shutdown Timer
  • Micropower Shutdown: IQ <30µA
  • Available in a 16-Pin Narrow SSOP Package

Additional Details
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The LTC1778 is a synchronous stepdown switching regulator controller optimized for CPU power. The controller uses a valley current control architecture to deliver very low duty cycles with excellent transient response without requiring a sense resistor. Operating frequency is selected by an external resistor and is compensated for variations in VIN.

Discontinuous mode operation provides high efficiency operation at light loads. A forced continuous control pin reduces noise and RF interference, and can assist secondary winding regulation by disabling discontinuous operation when the main output is lightly loaded.

Fault protection is provided by internal foldback current limiting, an output overvoltage comparator and optional short-circuit shutdown timer. Soft-start capability for supply sequencing is accomplished using an external timing capacitor. The regulator current limit level is user programmable. Wide supply range allows operation from 4V to 36V at the input and from 0.8V up to (0.9)VIN at the output.

Applications

  • Notebook and Palmtop Computers, PDAs
  • Distributed Power Systems
Part Models 6
1ku List Price Starting From $3.25

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
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LTC1778EGN#TRPBF
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LTC1778EGN-1#PBF
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LTC1778EGN-1#TRPBF
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LTC1778IGN#PBF
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LTC1778IGN#TRPBF
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Product Lifecycle

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Oct 11, 2022

- 22_0235

Epoxy Change from Henkel 8290 to 8290A for GN Package

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Apr 6, 2022

- 22_0066

Laser Top Mark for 16QSOP Assembled in ADPG [PNG]

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Filter by Model

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Part Models

Product Lifecycle

PCN

Oct 11, 2022

- 22_0235

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Epoxy Change from Henkel 8290 to 8290A for GN Package

LTC1778EGN#PBF

PRODUCTION

LTC1778EGN#TRPBF

PRODUCTION

LTC1778EGN-1#PBF

PRODUCTION

LTC1778EGN-1#TRPBF

PRODUCTION

LTC1778IGN#PBF

PRODUCTION

LTC1778IGN#TRPBF

PRODUCTION

Apr 6, 2022

- 22_0066

arrow down

Laser Top Mark for 16QSOP Assembled in ADPG [PNG]

LTC1778EGN#PBF

PRODUCTION

LTC1778EGN#TRPBF

PRODUCTION

LTC1778EGN-1#PBF

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Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 2

reference details image

DC385A

LTC1778EGN Demo Board | IMVPII I/O Power Supply, VIN = 5V-25V, VOUT = 1.2V @ 6A

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DC385A

LTC1778EGN Demo Board | IMVPII I/O Power Supply, VIN = 5V-25V, VOUT = 1.2V @ 6A

LTC1778EGN Demo Board | IMVPII I/O Power Supply, VIN = 5V-25V, VOUT = 1.2V @ 6A

Product Detail

Demonstration circuit DC385 is a high density synchronous step-down (buck) regulator using the LTC1778 No RSENSE switching regulator controller. This controller uses a valley current control architecture to deliver very low duty cycles without requiring a sense resistor. The demo board input voltage range is 5V to 25V and it provides 1.2V@6A at the output.

reference details image

DC378A

LTC1778EGN | No RSENSE, 5V ≤ VIN ≤ 25V, VOUT = 2.5V @ 10A

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DC378A

LTC1778EGN | No RSENSE, 5V ≤ VIN ≤ 25V, VOUT = 2.5V @ 10A

LTC1778EGN | No RSENSE, 5V ≤ VIN ≤ 25V, VOUT = 2.5V @ 10A

Product Detail

Demonstration circuit DC378 is a synchronous step-down buck regulator using the LTC1778 No RSENSE switching regulator controller. The controller uses a valley current control architecture to deliver very low duty cycles without requiring a sense resistor. The demo board operates with a 5V to 25V supply voltage and provides a 2.5V@10A output.


 


Tools & Simulations

Tools & Simulations 1

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.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.

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