LTC3878 - Fast, Wide Operating Range No RSENSE Step-Down DC/DC Controller

LTC1778 - Wide Operating Range, No RSENSE Step-Down Controller

Features

  • Click Here For LTC1778 Evaluation Kits
  • 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

Typical Application

LTC1778
LTC1778
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Description

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.

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Packaging

SSOP-16

LTC1778
LTC1778
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Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LTC1778EGN SSOP 16 E $3.07 $2.70 View
LTC1778EGN#PBF SSOP 16 E $3.07 $2.70 View
LTC1778EGN#TR SSOP 16 E   $2.76 View
LTC1778EGN#TRPBF SSOP 16 E   $2.76 View
LTC1778EGN-1 SSOP 16 E $3.07 $2.70 View
LTC1778EGN-1#PBF SSOP 16 E $3.07 $2.70 View
LTC1778EGN-1#TR SSOP 16 E   $2.76 View
LTC1778EGN-1#TRPBF SSOP 16 E   $2.76 View
LTC1778IGN SSOP 16 I $4.43 $3.10 View
LTC1778IGN#PBF SSOP 16 I $4.43 $3.10 View
LTC1778IGN#TR SSOP 16 I   $3.16 View
LTC1778IGN#TRPBF SSOP 16 I   $3.16 View
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Evaluation Kits

Part Number Description Price
DC378A LTC1778EGN | No Rsense Wide Operating Range DC/DC Converter, 5~25Vin, 2.5Vout @ 10A $125.00
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Applications

  • Notebook and Palmtop Computers, PDAs
  • Distributed Power Systems
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Simulate

LTSpice / SwitcherCAD III is a powerful FREE circuit simulator and schematic capture program, providing macro models for 80% of Linear Technology's switching regulators, over 200 op amp models, as well as resistors, transistors and MOSFET models.

  • Step 1. If you do not already have a copy of LTSpice, click here to download and install LTSpice / SwitcherCAD III

  • Step 2. Once LTSpice is installed, click here for a ready to run  demonstration circuit of the LTC1778.

  • Step 3. If LTspice / SwitcherCAD III does not automatically open after clicking the above link, 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 demonstartion circuit by selecting "Open" from the "File" menu.
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