LTC1778
LTC1778-1

PRODUCTION

Wide Operating Range, No RSENSE Step-Down Controller

Data Sheet (Rev. B) Product Selection Table
Part Models
6
1ku List Price
Starting From $3.25
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Part Details

  • 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
LTC1778
LTC1778-1
Wide Operating Range, No RSENSE Step-Down Controller
Figure 1. High Efficiency Step-Down Converter Efficiency vs Load Current Product Package 1 Product Package 2
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 2

Design Note 3

Technical Articles 4

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Hardware Ecosystem

Parts Product Life Cycle Description
LTC3878
PRODUCTION Fast, Wide Operating Range No RSENSE Step-Down DC/DC Controller
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Tools & Simulations

LTspice 2

Models for the following parts are available in LTspice:

  • LTC1778
  • LTC1778-1
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.

Evaluation Kits

eval board
schematic 1
DC378A

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

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Product Details

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.


 


eval board
schematic 2
DC385A

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

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Product Details

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.
DC378A
LTC1778EGN | No RSENSE, 5V ≤ VIN ≤ 25V, VOUT = 2.5V @ 10A
DC378A - Schematic
DC385A
LTC1778EGN Demo Board | IMVPII I/O Power Supply, VIN = 5V-25V, VOUT = 1.2V @ 6A
DC385A - Schematic

Latest Discussions

3 Years Ago
RE: LTC1778 maximum inductor value
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