Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.NET

X  

LTC3780EUHPBF Datasheet(PDF) 21 Page - Linear Technology

Part # LTC3780EUHPBF
Description  High Efficiency, Synchronous 4-Switch Buck-Boost Controller
Download  30 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3780EUHPBF Datasheet(HTML) 21 Page - Linear Technology

Back Button LTC3780EUHPBF Datasheet HTML 17Page - Linear Technology LTC3780EUHPBF Datasheet HTML 18Page - Linear Technology LTC3780EUHPBF Datasheet HTML 19Page - Linear Technology LTC3780EUHPBF Datasheet HTML 20Page - Linear Technology LTC3780EUHPBF Datasheet HTML 21Page - Linear Technology LTC3780EUHPBF Datasheet HTML 22Page - Linear Technology LTC3780EUHPBF Datasheet HTML 23Page - Linear Technology LTC3780EUHPBF Datasheet HTML 24Page - Linear Technology LTC3780EUHPBF Datasheet HTML 25Page - Linear Technology Next Button
Zoom Inzoom in Zoom Outzoom out
 21 / 30 page
background image
LTC3780
21
3780ff
For more information www.linear.com/LTC3780
applicaTions inForMaTion
EXTVCC Connection
The LTC3780 contains an internal P-channel MOSFET
switch connected between the EXTVCC and INTVCC pins.
When the voltage applied to EXTVCC rises above 5.7V, the
internal regulator is turned off and a switch connects the
EXTVCC pin to the INTVCC pin thereby supplying internal
power. The switch remains closed as long as the voltage
applied to EXTVCC remains above 5.5V. This allows the
MOSFET driver and control power to be derived from the
output when (5.7V < VOUT < 7V) and from the internal
regulator when the output is out of regulation (start-up,
short-circuit). If more current is required through the
EXTVCC switch than is specified, an external Schottky
diode can be interposed between the EXTVCC and INTVCC
pins. Ensure that EXTVCC ≤ VIN.
The following list summarizes the three possible connec-
tions for EXTVCC:
1. EXTVCC left open (or grounded). This will cause INTVCC
to be powered from the internal 6V regulator at the cost
of a small efficiency penalty.
2. EXTVCC connected directly to VOUT (5.7V < VOUT < 7V).
This is the normal connection for a 6V regulator and
provides the highest efficiency.
3. EXTVCC connected to an external supply. If an external
supply is available in the 5.5V to 7V range, it may be
used to power EXTVCC provided it is compatible with
the MOSFET gate drive requirements.
Output Voltage
The LTC3780 output voltage is set by an external feedback
resistivedividercarefullyplacedacrosstheoutputcapacitor.
Theresultantfeedbacksignaliscomparedwiththeinternal
precision 0.800V voltage reference by the error amplifier.
The output voltage is given by the equation:
VV
R
R
OUT =+


08
1
2
1
.•
Topside MOSFET Driver Supply (CA, DA, CB, DB)
Referring to Figure 11, the external bootstrap capacitors
CA and CB connected to the BOOST1 and BOOST2 pins
supply the gate drive voltage for the topside MOSFET
switches A and D. When the top MOSFET switch A turns
on, the switch node SW2 rises to VIN and the BOOST2
pin rises to approximately VIN + INTVCC. When the bottom
MOSFET switch B turns on, the switch node SW2 drops
to low and the boost capacitor CB is charged through DB
from INTVCC. When the top MOSFET switch D turns on,
the switch node SW1 rises to VOUT and the BOOST1 pin
rises to approximately VOUT + INTVCC. When the bottom
MOSFET switch C turns on, the switch node SW1 drops
to low and the boost capacitor CA is charged through DA
from INTVCC. The boost capacitors CA and CB need to
store about 100 times the gate charge required by the top
MOSFET switch A and D. In most applications a 0.1µF to
0.47µF, X5R or X7R dielectric capacitor is adequate.
Run Function
The RUN pin provides simple ON/OFF control for the
LTC3780. Driving the RUN pin above 1.5V permits the
controller to start operating. Pulling RUN below 1.5V puts
theLTC3780intolowcurrentshutdown.Donotapplymore
than 6V to the RUN pin.
Soft-Start Function
Soft-start reduces the input power sources’ surge cur-
rents by gradually increasing the controller’s current
limit (proportional to an internally buffered and clamped
equivalent of VITH).
An internal 1.2µA current source charges up the CSS ca-
pacitor. As the voltage on SS increases from 0V to 2.4V,
the internal current limit rises from 0V/RSENSE to 150mV/
RSENSE. The output current limit ramps up slowly, taking
1.5s/µFtoreachfullcurrent.Theoutputcurrentthusramps
up slowly, eliminating the starting surge current required
from the input power supply.
TIRMP =
2.4V
1.2µA
• CSS = 1.5s/µF
(
)•CSS
Do not apply more than 6V to the SS pin.
Current foldback is disabled during soft-start until the
voltage on CSS reaches 2V. Make sure CSS is large enough
when there is loading during start-up.


Similar Part No. - LTC3780EUHPBF

ManufacturerPart #DatasheetDescription
logo
Linear Technology
LTC3780EUH LINER-LTC3780EUH Datasheet
421Kb / 28P
   High Efficiency, Synchronous, 4-Switch Buck-Boost Controller
LTC3780EUH LINER-LTC3780EUH Datasheet
556Kb / 30P
   High Efficiency, Synchronous,4-Switch Buck-Boost Controller
More results

Similar Description - LTC3780EUHPBF

ManufacturerPart #DatasheetDescription
logo
Linear Technology
LTC3780EG LINER-LTC3780EG Datasheet
556Kb / 30P
   High Efficiency, Synchronous,4-Switch Buck-Boost Controller
LTC3780 LINER-LTC3780_15 Datasheet
629Kb / 30P
   High Efficiency, Synchronous, 4-Switch Buck-Boost Controller
LTC3780 LINER-LTC3780 Datasheet
421Kb / 28P
   High Efficiency, Synchronous, 4-Switch Buck-Boost Controller
LTC3789 LINER-LTC3789_15 Datasheet
535Kb / 30P
   High Efficiency, Synchronous, 4-Switch Buck-Boost Controller
LTC3789 LINER-LTC3789 Datasheet
491Kb / 28P
   High Efficiency, Synchronous, 4-Switch Buck-Boost Controller
LT3791EFE-1 LINER-LT3791EFE-1 Datasheet
332Kb / 26P
   60V 4-Switch Synchronous Buck-Boost Controller
LT3790 LINER-LT3790_15 Datasheet
451Kb / 28P
   60V Synchronous 4-Switch Buck-Boost Controller
logo
Renesas Technology Corp
ISL81401 RENESAS-ISL81401 Datasheet
3Mb / 47P
   40V 4-Switch Synchronous Buck-Boost Controller
Jan 27, 2022
logo
Linear Technology
LT3791-1 LINER-LT3791-1_15 Datasheet
332Kb / 26P
   60V 4-Switch Synchronous Buck-Boost Controller
LTC3780 LINER-LTC3780_12 Datasheet
392Kb / 28P
   High Effi ciency, Synchronous, 4-Switch Buck-Boost Controller
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30


Datasheet Download

Go To PDF Page


Link URL




Privacy Policy
ALLDATASHEET.NET
Does ALLDATASHEET help your business so far?  [ DONATE ] 

About Alldatasheet   |   Advertisement   |   Contact us   |   Privacy Policy   |   Link Exchange   |   Manufacturer List
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com