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LTC1776CS8, LTC1776IS8, LTC1778

Table of contents:
Info of LTC1776CS8
Info of LTC1776IS8
Info of LTC1778

LTC1776CS8, LTC1776IS8, LTC1778 Selling Leads, Datasheet

MFG:Linear Package Cooled:SOP-8 D/C:05+

LTC1776CS8, LTC1776IS8, LTC1778 Datasheet download

Five Points

Part Number: LTC1776CS8

MFG: Linear

Package Cooled: SOP-8

D/C: 05+

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LTC1778 General Description

The LTC^®1778 is a synchronous step-down 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 V_IN.

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)V_IN at the output.

LTC1778 Maximum Ratings

Input Supply Voltage (V_IN, I_ON)................. 36V to 0.3V
Boosted Topside Driver Supply Voltage
(BOOST) ................................................... 42V to 0.3V
SW Voltage .................................................. 36V to 5V
EXTV_CC, (BOOST SW), RUN/SS,
PGOOD Voltages........................................... 7V to 0.3V
FCB, V_ON, VRNG Voltages ........... INTV_CC + 0.3V to 0.3V
I_TH, V_FB Voltages........................................ 2.7V to 0.3V
TG, BG, INTV_CC, EXTVCC Peak Currents........................ 2A
TG, BG, INTV_CC, EXTVCC RMS Currents ................... 50mA
Operating Ambient Temperature
Range (Note 4) ....................................... 40to 85
Junction Temperature (Note 2) ............................... 125
Storage Temperature Range ................... 65 to 150
Lead Temperature (Soldering, 10 sec)..................... 300

LTC1778 Features

`No Sense Resistor Required
`True Current Mode Control
` Optimized for High Step-Down Ratios
` t_ON(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 V_IN 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: I_Q < 30A
` Available in a 16-Pin Narrow SSOP Package

LTC1778 Typical Application

· Notebook and Palmtop Computers
· Distributed Power Systems

LTC1778 Connection Diagram

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