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LT1776CN8

Description
Wide Input Range, High Efficiency, Step-Down Switching Regulator
CategoryPower/power management    The power supply circuit   
File Size154KB,20 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Download Datasheet Parametric Compare View All

LT1776CN8 Overview

Wide Input Range, High Efficiency, Step-Down Switching Regulator

LT1776CN8 Parametric

Parameter NameAttribute value
Brand NameLinear Technology
Is it Rohs certified?incompatible
MakerLinear ( ADI )
Parts packaging codeDIP
package instructionDIP, DIP8,.3
Contacts8
Manufacturer packaging codeN
Reach Compliance Code_compli
ECCN codeEAR99
Is SamacsysN
Analog Integrated Circuits - Other TypesSWITCHING REGULATOR
control modeCURRENT-MODE
Control TechnologyPULSE WIDTH MODULATION
Maximum input voltage60 V
Minimum input voltage7.4 V
Nominal input voltage40 V
JESD-30 codeR-PDIP-T8
JESD-609 codee0
Humidity sensitivity level1
Number of functions1
Number of terminals8
Maximum operating temperature70 °C
Minimum operating temperature
Maximum output current0.7 A
Package body materialPLASTIC/EPOXY
encapsulated codeDIP
Encapsulate equivalent codeDIP8,.3
Package shapeRECTANGULAR
Package formIN-LINE
Peak Reflow Temperature (Celsius)NOT SPECIFIED
Certification statusNot Qualified
Maximum seat height3.937 mm
surface mountNO
Switch configurationBUCK
Maximum switching frequency230 kHz
technologyBIPOLAR
Temperature levelCOMMERCIAL
Terminal surfaceTin/Lead (Sn/Pb)
Terminal formTHROUGH-HOLE
Terminal pitch2.54 mm
Terminal locationDUAL
Maximum time at peak reflow temperatureNOT SPECIFIED
width7.62 mm
Base Number Matches1
LT1776
Wide Input Range,
High Efficiency, Step-Down
Switching Regulator
FEATURES
s
s
s
s
DESCRIPTIO
s
s
s
s
s
Wide Input Range: 7.4V to 40V
Tolerates Input Transients to 60V
700mA Peak Switch Rating
Adaptive Switch Drive Maintains Efficiency at High
Load Without Pulse Skipping at Light Load
True Current Mode Control
200kHz Fixed Operating Frequency
Synchronizable to 400kHz
Low Supply Current in Shutdown: 30µA
Available in 8-Pin SO and PDIP Packages
The LT
®
1776 is a wide input range, high efficiency Buck
(step-down) switching regulator. The monolithic die in-
cludes all oscillator, control and protection circuitry. The
part can accept input voltages as high as 60V and contains
an output switch rated at 700mA peak current. Current
mode control delivers excellent dynamic input supply
rejection and short-circuit protection.
The LT1776 contains several features to enhance effi-
ciency. The internal control circuitry is normally powered
via the V
CC
pin, thereby minimizing power drawn directly
from the V
IN
supply (see Applications Information). The
action of the LT1776 switch circuitry is also load depen-
dent. At medium to high loads, the output switch circuitry
maintains fast rise time for good efficiency. At light loads,
rise time is deliberately reduced to avoid pulse skipping
behavior.
The available SO-8 package and 200kHz switching fre-
quency allow for minimal PC board area requirements.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
s
s
s
Automotive DC/DC Converters
Cellular Phone Battery Charger Accessories
IEEE 1394 Step-Down Converters
TYPICAL APPLICATIO
V
IN
8V TO 40V
1
5
V
IN
SHDN
V
CC
V
SW
39µF
63V
6
LT1776
7
FB
8
V
C
2
3
90
80
100µH*
MBR160
100µF
10V
EFFICIENCY (%)
+
+
5V
400mA
36.5k
1%
70
60
50
40
SYNC
2200pF
22k
100pF
12.1k
1%
GND
4
*43T #30 ON MAGNETICS
MPP #55030
1776 F01
V
IN
= 10V
V
IN
= 20V
30
V
IN
= 30V
V
IN
= 40V
20
1
Figure 1
U
Efficiency vs V
IN
and I
LOAD
10
100
LOAD CURRENT (mA)
1000
1776 TA01
U
U
1

LT1776CN8 Related Products

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Description Wide Input Range, High Efficiency, Step-Down Switching Regulator Wide Input Range, High Efficiency, Step-Down Switching Regulator Wide Input Range, High Efficiency, Step-Down Switching Regulator Wide Input Range, High Efficiency, Step-Down Switching Regulator Wide Input Range, High Efficiency, Step-Down Switching Regulator Wide Input Range, High Efficiency, Step-Down Switching Regulator Wide Input Range, High Efficiency, Step-Down Switching Regulator
Brand Name Linear Technology Linear Technology Linear Technology - Linear Technology - -
Is it Rohs certified? incompatible incompatible incompatible - incompatible - -
Maker Linear ( ADI ) Linear ( ADI ) Linear ( ADI ) - Linear ( ADI ) - -
Parts packaging code DIP SOIC DIP - SOIC - -
package instruction DIP, DIP8,.3 0.150 INCH, PLASTIC, SO-8 DIP, DIP8,.3 - SOP, SOP8,.25 - -
Contacts 8 8 8 - 8 - -
Manufacturer packaging code N S8 N - S8 - -
Reach Compliance Code _compli _compli _compli - _compli - -
ECCN code EAR99 EAR99 EAR99 - EAR99 - -
Is Samacsys N N N - N - -
Analog Integrated Circuits - Other Types SWITCHING REGULATOR SWITCHING REGULATOR SWITCHING REGULATOR - SWITCHING REGULATOR - -
control mode CURRENT-MODE CURRENT-MODE CURRENT-MODE - CURRENT-MODE - -
Control Technology PULSE WIDTH MODULATION PULSE WIDTH MODULATION PULSE WIDTH MODULATION - PULSE WIDTH MODULATION - -
Maximum input voltage 60 V 60 V 60 V - 60 V - -
Minimum input voltage 7.4 V 7.4 V 7.4 V - 7.4 V - -
Nominal input voltage 40 V 40 V 40 V - 40 V - -
JESD-30 code R-PDIP-T8 R-PDSO-G8 R-PDIP-T8 - R-PDSO-G8 - -
JESD-609 code e0 e0 e0 - e0 - -
Humidity sensitivity level 1 1 1 - 1 - -
Number of functions 1 1 1 - 1 - -
Number of terminals 8 8 8 - 8 - -
Maximum operating temperature 70 °C 85 °C 85 °C - 70 °C - -
Maximum output current 0.7 A 1 A 1 A - 1 A - -
Package body material PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY - PLASTIC/EPOXY - -
encapsulated code DIP SOP DIP - SOP - -
Encapsulate equivalent code DIP8,.3 SOP8,.25 DIP8,.3 - SOP8,.25 - -
Package shape RECTANGULAR RECTANGULAR RECTANGULAR - RECTANGULAR - -
Package form IN-LINE SMALL OUTLINE IN-LINE - SMALL OUTLINE - -
Peak Reflow Temperature (Celsius) NOT SPECIFIED 235 NOT SPECIFIED - 235 - -
Certification status Not Qualified Not Qualified Not Qualified - Not Qualified - -
Maximum seat height 3.937 mm 1.75 mm 3.937 mm - 1.75 mm - -
surface mount NO YES NO - YES - -
Switch configuration BUCK BUCK BUCK - BUCK - -
Maximum switching frequency 230 kHz 230 kHz 230 kHz - 230 kHz - -
technology BIPOLAR BIPOLAR BIPOLAR - BIPOLAR - -
Temperature level COMMERCIAL INDUSTRIAL INDUSTRIAL - COMMERCIAL - -
Terminal surface Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb) - Tin/Lead (Sn/Pb) - -
Terminal form THROUGH-HOLE GULL WING THROUGH-HOLE - GULL WING - -
Terminal pitch 2.54 mm 1.27 mm 2.54 mm - 1.27 mm - -
Terminal location DUAL DUAL DUAL - DUAL - -
Maximum time at peak reflow temperature NOT SPECIFIED 20 NOT SPECIFIED - 20 - -
width 7.62 mm 3.9 mm 7.62 mm - 3.9 mm - -
Base Number Matches 1 1 1 - 1 - -
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