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DC309A

Description
board eval for ltc1773ems
CategoryDevelopment board/suite/development tools   
File Size246KB,8 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Environmental Compliance  
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DC309A Overview

board eval for ltc1773ems

DEMO MANUAL DC309
NO-DESIGN SWITCHER
DESCRIPTIO
LTC1773 Low Input Voltage
Synchronous Current Mode
Step-Down DC/DC Converter
make the LTC1773 ideal for battery-powered applications.
In dropout, the external P-channel MOSFET is turned on
continuously (100% duty cycle), providing low dropout
operation when V
IN
approaches V
OUT
. Under light load
conditions, efficiency can be improved by activating Burst
Mode
TM
operation, which is done by connecting the SYNC/
FCB pin to V
IN
or leaving it floating. Tying this pin to ground
will force continuous operation, regardless of the load.
The SYNC/FCB pin can also be used to synchronize the
LTC1773 to frequencies of up to 750kHz. At input voltages
below 2.5V, the LTC1773’s undervoltage lockout feature is
activated, shutting down the output. Soft-start is provided
by connecting an external capacitor to the RUN/SS pin.
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.
Demo board DC309 is a step-down (buck) regulator using
the LTC
®
1773. The exclusive use of surface mount com-
ponents results in a highly efficient application in a very
small board space. It is ideal for cell phones and other
portable electronics operating from one or two Li-Ion cells
or three to six NiCd cells. DC309 is capable of providing
2.5A at an output voltage of 1.8V with an input supply of
3.3V. This demo board highlights the capabilities of the
LTC1773, which uses a current mode PWM architecture to
synchronously drive an external pair of P- and N-channel
power MOSFETs. The result is a high performance power
supply that has low output voltage ripple. A constant
operating frequency of 550kHz makes the LTC1773 attrac-
tive for noise-sensitive applications while allowing for
smaller external components such as the inductor and the
output capacitor. In addition, its high efficiency over a
wide load current range and its low quiescent current
PERFOR A CE SU
SYMBOL
V
IN
V
OUT
PARAMETER
Output Voltage
Input Supply Voltage Range
TYPICAL PERFOR A CE CHARACTERISTICS A D BOARD PHOTO
Efficiency
100
90
EFFICIENCY (%)
V
OUT
= 2.5V
SEE FIGURE 1
V
IN
= 3.3V
V
IN
= 5V
80
70
60
50
1
V
IN
= 8V
10
100
1000
OUTPUT CURRENT (mA)
10,000
DC309 TA01
U
WW
U W
U
ARY
U W
CONDITIONS
V
OUT
= 1.8V
I
OUT
= 1A
I
OUT
= 1A
I
OUT
= 1A
I
OUT
= 1A
VALUE
2.8V to 8.5V
3.3V
±0.066V
2.5V
±0.050V
1.8V
±0.036V
1.5V
±0.030V
dc309fa
1

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DC309A LTC1773EMS#TR LTC1773EMS#TRPBF LTC1773EMS#PBF
Description board eval for ltc1773ems IC reg ctrlr buck pwm CM 10-msop IC REG CTRLR BUCK 10MSOP IC REG CTRLR BUCK 10MSOP
Brand Name - Linear Technology Linear Technology Linear Technology
Is it Rohs certified? - incompatible conform to conform to
Maker - Linear ( ADI ) Linear ( ADI ) Linear ( ADI )
Parts packaging code - MSOP MSOP MSOP
package instruction - TSSOP, TSSOP, TSSOP, TSSOP10,.19,20
Contacts - 10 10 10
Manufacturer packaging code - MS MS MS
Reach Compliance Code - _compli compliant compliant
ECCN code - EAR99 EAR99 EAR99
Is Samacsys - N N N
Analog Integrated Circuits - Other Types - SWITCHING CONTROLLER SWITCHING CONTROLLER SWITCHING CONTROLLER
control mode - CURRENT-MODE CURRENT-MODE CURRENT-MODE
Control Technology - PULSE WIDTH MODULATION PULSE WIDTH MODULATION PULSE WIDTH MODULATION
Maximum input voltage - 8.5 V 8.5 V 8.5 V
Minimum input voltage - 2.65 V 2.65 V 2.65 V
Nominal input voltage - 5 V 5 V 5 V
JESD-30 code - S-PDSO-G10 S-PDSO-G10 S-PDSO-G10
JESD-609 code - e0 e3 e3
length - 3 mm 3 mm 3 mm
Humidity sensitivity level - 1 1 1
Number of functions - 1 1 1
Number of terminals - 10 10 10
Maximum operating temperature - 70 °C 70 °C 70 °C
Package body material - PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY
encapsulated code - TSSOP TSSOP TSSOP
Package shape - SQUARE SQUARE SQUARE
Package form - SMALL OUTLINE, THIN PROFILE, SHRINK PITCH SMALL OUTLINE, THIN PROFILE, SHRINK PITCH SMALL OUTLINE, THIN PROFILE, SHRINK PITCH
Peak Reflow Temperature (Celsius) - 235 260 260
Certification status - Not Qualified Not Qualified Not Qualified
Maximum seat height - 1.1 mm 1.1 mm 1.1 mm
surface mount - YES YES YES
Switch configuration - BUCK BUCK BUCK
Maximum switching frequency - 600 kHz 600 kHz 600 kHz
Temperature level - COMMERCIAL COMMERCIAL COMMERCIAL
Terminal surface - Tin/Lead (Sn/Pb) Matte Tin (Sn) Matte Tin (Sn)
Terminal form - GULL WING GULL WING GULL WING
Terminal pitch - 0.5 mm 0.5 mm 0.5 mm
Terminal location - DUAL DUAL DUAL
Maximum time at peak reflow temperature - 20 30 30
width - 3 mm 3 mm 3 mm
Base Number Matches - 1 1 1
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