EEWORLDEEWORLDEEWORLD

Part Number

Search

LTC1778EGN-1#TRPBF

Description
DC/DC Cntrlr Single-OUT Step Down 16-Pin SSOP N T/R
File Size261KB,24 Pages
ManufacturerADI
Websitehttps://www.analog.com
Download Datasheet Parametric View All

LTC1778EGN-1#TRPBF Overview

DC/DC Cntrlr Single-OUT Step Down 16-Pin SSOP N T/R

LTC1778EGN-1#TRPBF Parametric

Parameter NameAttribute value
EU restricts the use of certain hazardous substancesCompliant
ECCN (US)EAR99
Part StatusActive
HTS8542.39.00.01
Number of Outputs1
TopologyStep Down
Output Voltage (V)0.8 to 32.4
Minimum Input Voltage (V)4
Maximum Input Voltage (V)36
Operating Supply Voltage (V)4 to 36
Maximum Supply Current (mA)2
Typical Gate Driver Pull Up Resistance (Ohm)2/3
Typical Gate Driver Pull Down Resistance (Ohm)1/2
Synchronous RectifierYes
Synchronous ClockNo
ProgrammabilityYes
Minimum Operating Temperature (°C)-40
Maximum Operating Temperature (°C)85
Supplier Temperature GradeExtended
PackagingTape and Reel
Pin Count16
Standard Package NameSOP
Supplier PackageSSOP N
MountingSurface Mount
Package Height1.5(Max)
Package Length4.98(Max)
Package Width3.99(Max)
PCB changed16
Lead ShapeGull-wing
LTC1778/LTC1778-1
Wide Operating Range,
No R
SENSE
TM
Step-Down Controller
FEATURES
DESCRIPTIO
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 C
OUT
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
< 30µA
Available in a 16-Pin Narrow SSOP Package
The LTC
®
1778 is a synchronous step-down switching
regulator controller optimized for CPU power. The con-
troller 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 second-
ary winding regulation by disabling discontinuous opera-
tion 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 sup-
ply sequencing is accomplished using an external timing
capacitor. The regulator current limit level is user program-
mable. 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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
No R
SENSE
is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents, including 5481178, 6100678, 6580258, 5847554, 6304066
APPLICATIO S
Notebook and Palmtop Computers
Distributed Power Systems
TYPICAL APPLICATIO
R
ON
1.4MΩ
C
SS
0.1µF
RUN/SS
C
C
500pF
I
TH
R
C
20k
SGND
LTC1778
INTV
CC
BG
I
ON
V
IN
TG
SW
BOOST
M1
Si4884
C
B
0.22µF
D
B
CMDSH-3
M2
Si4874
C
VCC
4.7µF
L1
1.8µH
EFFICIENCY (%)
C
IN
10µF
50V
×3
V
IN
5V TO 28V
90
+
D1
B340A
R2
30.1k
C
OUT
180µF
4V
×2
V
OUT
2.5V
10A
+
PGOOD
PGND
V
FB
R1
14k
1778 F01a
Figure 1. High Efficiency Step-Down Converter
1778fb
U
Efficiency vs Load Current
100
V
OUT
= 2.5V
V
IN
= 5V
V
IN
= 25V
80
70
60
0.01
1
0.1
LOAD CURRENT (A)
10
1778 F01b
U
U
1
EEWORLD University Hall----Special Seminar on Oximeter
Oximeter seminar : https://training.eeworld.com.cn/course/364...
zhangjianee Talking
MCU serial port sends data frame
It is rare to see information about how to send a frame of data in an interrupt manner. If the data frame is sent while waiting, it is a waste of time for a high-speed microcontroller. The following i...
fish001 Microcontroller MCU
Test issues of intercom system
May I ask what testing methods are there for the video intercom system of the intelligent community (including intercom extensions, management machines, door machines, etc.)?...
影子 Test/Measurement
I would like to ask you a question about signed int addition
For example, if we add 8 signed ints, we use three bytes to store the result because the result will not be greater than 0xfff but may be greater than 0xff. Now we have a problem. How do we know wheth...
mynamezj Embedded System
Part-time PCB design
I work as a PCB layout engineer in a research and development company. I have many years of experience in circuit design and PCB design. I can handle work independently. I have experience in designing...
cad.pcb PCB Design
Are there any practical formulas for power supply design techniques?
There are many power supply design formulas in the book, which are a bit confusing. Please give me some advice....
zhangq Embedded System

EEWorld
subscription
account

EEWorld
service
account

Automotive
development
circle

Robot
development
community

Index Files: 1297  1122  2602  690  396  27  23  53  14  8 
Datasheet   0 1 2 3 4 5 6 7 8 9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Room 1530, 15th Floor, Building B, No. 18 Zhongguancun Street, Haidian District, Beijing Telephone: (010) 82350740 Postal Code: 100190
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved 京ICP证060456号 京ICP备10001474号-1 电信业务审批[2006]字第258号函 京公网安备 11010802033920号