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LTC1779ES6#TRMPBF

Description
IC REG BUCK ADJ 0.25A SOT23-6
CategoryPower/power management    The power supply circuit   
File Size257KB,14 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Environmental Compliance
Download Datasheet Parametric View All

LTC1779ES6#TRMPBF Overview

IC REG BUCK ADJ 0.25A SOT23-6

LTC1779ES6#TRMPBF Parametric

Parameter NameAttribute value
Brand NameLinear Technology
Is it Rohs certified?conform to
MakerLinear ( ADI )
Parts packaging codeSOT
package instructionLSSOP,
Contacts6
Manufacturer packaging codeS6
Reach Compliance Codecompliant
ECCN codeEAR99
Is SamacsysN
Analog Integrated Circuits - Other TypesSWITCHING REGULATOR
control modeCURRENT-MODE
Maximum input voltage9.8 V
Minimum input voltage2.5 V
Nominal input voltage4.2 V
JESD-30 codeR-PDSO-G6
JESD-609 codee3
length2.95 mm
Humidity sensitivity level1
Number of functions1
Number of terminals6
Maximum operating temperature85 °C
Minimum operating temperature-40 °C
Maximum output current0.5 A
Package body materialPLASTIC/EPOXY
encapsulated codeLSSOP
Package shapeRECTANGULAR
Package formSMALL OUTLINE, LOW PROFILE, SHRINK PITCH
Peak Reflow Temperature (Celsius)250
Certification statusNot Qualified
Maximum seat height1.45 mm
surface mountYES
Switch configurationBUCK
Maximum switching frequency650 kHz
Temperature levelINDUSTRIAL
Terminal surfaceMatte Tin (Sn)
Terminal formGULL WING
Terminal pitch0.95 mm
Terminal locationDUAL
Maximum time at peak reflow temperatureNOT SPECIFIED
width1.625 mm
Base Number Matches1
FeaTures
n
n
n
n
n
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LTC1779
250mA Current Mode
Step-Down DC/DC Converter
in ThinSOT
DescripTion
The
LTC
®
1779
is a constant frequency current mode step-
down DC/DC converter in a 6-lead ThinSOT package. The
part operates with a 2.5V to 9.8V input and can provide
up to 250mA of output current. Current mode control
provides excellent AC and DC load and line regulation.
The device incorporates an accurate undervoltage lockout
feature that shuts down the LTC1779 when the input volt-
age falls below 2V.
The LTC1779 boasts a ± 2.5% output voltage accuracy
and consumes only 135µA of quiescent current. For ap-
plications where efficiency is a prime consideration, the
LTC1779 is configured for Burst Mode operation, which
enhances efficiency at low output current.
To further maximize the life of a battery source, the
internal P-channel MOSFET is turned on continuously in
dropout (100% duty cycle). In shutdown, the device draws
a mere 8µA. High constant operating frequency of 550kHz
allows the use of a small external inductor.
The LTC1779 is available in a low profile (1mm) ThinSOT
package.
L,
LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks
and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
n
n
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High Efficiency: Up to 94%
250mA Output Current
Wide V
IN
Range: 2.5V to 9.8V
550kHz Constant Frequency Operation
Burst Mode™ Operation at Light Load
Low Dropout: 100% Duty Cycle
0.8V Reference Allows Low Output Voltages
±2.5% Reference Accuracy
Current Mode Operation for Excellent Line and Load
Transient Response
Low Quiescent Current: 135µA
Shutdown Mode Draws Only 8µA Supply Current
Low Profile (1mm) ThinSOT™ Package
applicaTions
n
n
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1- or 2-Cell Lithium-Ion-Powered Applications
Cellular Telephones
Wireless Modems
Portable Computers
Distributed 3.3V, 2.5V or 1.8V Power Systems
Scanners
Typical applicaTion
C3
0.1µF
1
20k
100pF
3
2
I
TH
/RUN
LTC1779
GND
V
FB
V
IN
SENSE
SW
6
5
4
R1
10
D1
L1
22µH
C1
10µF
16V
V
IN
2.5V
TO 9.8V
V
OUT
2.5V
100mA
EFFICIENCY (%)
Efficiency vs Load Current
100
90
80
70
60
50
40
30
0.1
1
V
OUT
= 2.5V
R
SENSE
= 10
10
100
LOAD CURRENT (mA)
1000
1779 F01b
+
C2
47µF
6V
V
IN
= 3.3V
V
IN
= 6V
V
IN
= 9.8V
169k
78.7k
1779 F01a
C1: TAIYO YUDEN CERAMIC EMK325BJ106MNT
C2: SANYO POSCAP 6TPA47M
D1: IR10BQ015
L1: COILTRONICS UP1B220
Figure 1. LTC1779 High Efficiency 2.5V/100mA Step-Down Converter
1779fa
For more information
www.linear.com/LTC1779
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