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LTC1475CMS8#TR

Description
IC reg buck adj 0.75a 8msop
CategoryPower/power management    The power supply circuit   
File Size236KB,8 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Download Datasheet Parametric View All

LTC1475CMS8#TR Overview

IC reg buck adj 0.75a 8msop

LTC1475CMS8#TR Parametric

Parameter NameAttribute value
Brand NameLinear Technology
Is it Rohs certified?incompatible
MakerLinear ( ADI )
Parts packaging codeMSOP
package instructionTSSOP, TSSOP8,.19
Contacts8
Manufacturer packaging codeMS8
Reach Compliance Codenot_compliant
ECCN codeEAR99
Analog Integrated Circuits - Other TypesSWITCHING REGULATOR
control modeCURRENT-MODE
Control TechnologyPULSE WIDTH MODULATION
Maximum input voltage18 V
Minimum input voltage3 V
Nominal input voltage10 V
JESD-30 codeS-PDSO-G8
JESD-609 codee0
length3 mm
Humidity sensitivity level1
Number of functions1
Number of terminals8
Maximum operating temperature70 °C
Minimum operating temperature
Maximum output current0.75 A
Package body materialPLASTIC/EPOXY
encapsulated codeTSSOP
Encapsulate equivalent codeTSSOP8,.19
Package shapeSQUARE
Package formSMALL OUTLINE, THIN PROFILE, SHRINK PITCH
Peak Reflow Temperature (Celsius)235
Certification statusNot Qualified
Maximum seat height1.17 mm
surface mountYES
Switch configurationBUCK
technologyCMOS
Temperature levelCOMMERCIAL
Terminal surfaceTin/Lead (Sn/Pb)
Terminal formGULL WING
Terminal pitch0.65 mm
Terminal locationDUAL
Maximum time at peak reflow temperature20
width3 mm
Base Number Matches1
DEMO MANUAL DC143
NO DESIGN SWITCHER
DEMO MANUAL DC143
LTC1474/LTC1475
10µA I
Q
, High Efficiency,
Step-Down DC/DC
Converter
10µA (typical) is required to regulate the output. The parts
can be shut down to further reduce the supply current to
6µA (typical). In dropout, the internal P-channel MOSFET
is turned on continuously (100% duty cycle), providing
low dropout operation with V
OUT
V
IN
. An onboard low-
battery detector allows the user to monitor the input
supply through an external resistive divider. This board is
intended for applications such as cellular phones, GSM
systems, 4mA to 20mA current-loop pirate supplies or any
portable battery-powered application.
Gerber files for this
circuit board are available. Call the LTC factory.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
DESCRIPTIO
This demonstration circuit is a step-down (buck) regulator
using the LTC
®
1474/LTC1475. The exclusive use of surface
mount components and the LTC1474/LTC1475 in the tiny
MSOP package results in a highly efficient application in a
small board space. This demo board highlights the
capabilities of the LTC1474/LTC1475, which use a current
mode, constant off-time architecture to switch an internal
P-channel power MOSFET. This results in a power supply
that has low ripple and fast transient response. At low
output currents the LTC1474/LTC1475 automatically
switch to Burst Mode
TM
operation to maintain high operating
efficiencies and minimize supply current. At no load,only
PERFORmANCE SU
SYMBOL
V
IN
V
OUT
PARAMETER
Input Voltage Range
Output Voltage
I
OUT
I
Q
Maximum Output Current
Typical Supply Current
TYPICAL PERFOR A CE CHARACTERISTICS A D BOARD PHOTO
Board A, B, D, E Efficiency
100
V
IN
= 5V
90
V
IN
= 10V
V
IN
= 15V
Demo Board A
EFFICIENCY (%)
80
70
60
L = 100µH
V
OUT
= 3.3V
R
SENSE
= 0Ω
3
30
0.3
LOAD CURRENT (mA)
300
DM143 TPC
50
0.03
DM143 DB A
U
WW
U W
U
ARY
CONDITIONS
V
OUT
= 3.3V
V
OUT
= 5V
LTC1474/LTC1475
LTC1474-3.3/LTC1475-3.3
LTC1474-5/LTC1475-5
R
SENSE
= 0Ω
R
SENSE
= 0.25Ω
V
IN
= 10V, I
LOAD
= 0
V
IN
= 10V, I
LOAD
= 0
U W
BOARD SUFFIX
A, B, D, E
C, F
A, D
B, E
C, F
ALL
ALL
A, B, C
D, E, F
VALUE
3.3V to 18V
5V to 18V
3.3V
±
0.10V
3.3V
±
0.10V
5V
±
0.15V
300mA
150mA
10µA
15µA
Demo Board D
DM143 DB D
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