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Linear Technology Electronic Components Datasheet

LTC3255IDD Datasheet

Step-Down Charge Pump

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LTC3255
Wide VIN Range
Fault Protected 50mA
Step-Down Charge Pump
FEATURES
DESCRIPTION
n Input Voltage Range: 4V to 48V
n Adjustable Regulated Output: 2.4V to 12.5V
n Output Current: 50mA Maximum
n 16μA Quiescent Current in Regulation at No Load
n Input Fault Protection from –52V to 60V
n Multimode Charge Pump (2:1, 1:1) with Automatic
Mode Switching Maintains Regulation Over Wide
VIN Range
n Input Voltage Shunt Mode for Current-Fed Applications
n Power Good Output
n Overtemperature and Short-Circuit Protection
n Operating Junction Temperature: 150°C Maximum
n Thermally Enhanced 10-Lead MSOP and 10-Lead
(3mm × 3mm) DFN packages
APPLICATIONS
n Industrial Control, Factory Automation, Sensors, and
SCADA Systems
n Housekeeping Power Supplies
n Current-Boosting Voltage Regulators for 4mA to
20mA Current Loops
The LTC®3255 is a switched-capacitor step-down DC/DC
converter that produces a regulated output (2.4V to 12.5V
adjustable) from a 4V to 48V input. In applications where
the input voltage exceeds twice the output voltage, 2:1
capacitive charge pumping extends output current capabil-
ity beyond input supply current limits. At no load, Burst
Mode® operation cuts VIN quiescent current to 16µA.
With its integrated VIN shunt regulator, the LTC3255
excels in 4mA to 20mA current loop applications. The
device enables current multiplication; a 4mA input current
can power a 7.4mA load continuously. Alternatively, the
LTC3255 serves as a higher efficiency replacement for
linear regulators and provides a space-saving inductor-
free alternative to buck DC/DC converters.
The LTC3255 withstands reverse-polarity input supplies
and output short-circuits without damage. Safety features
including current limit and overtemperature protection
further enhance robustness. The LTC3255 is available in
thermally enhanced 10-lead MSOP and low profile 3mm
× 3mm 10-lead DFN packages.
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks
and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
TYPICAL APPLICATION
7.4mA DC Supply from 4mA to 20mA Current Loop
1µF
+
4mA TO 20mA INPUT
>10V COMPLIANCE
VIN C+
CVOUT
EN LTC3255
1µF
SHUNT
PGOOD
BIAS GND
FB
0.1µF
220k
PGOOD
2.15M
OUTPUT
3.3V
7.4mA
10µF
1.21M
3255 TA01a
For more information www.linear.com/LTC3255
Available Output Current
vs Input Current
40
37
34
31
28
25
22
AVAILABLE
IOUT
INCREASED
IOUT CAPABILITY
19
16
13
10
INPUT
CURRENT
7
4
4 6 8 10 12 14 16 18 20
INPUT CURRENT (mA)
3255 TA01b
3255f
1


Linear Technology Electronic Components Datasheet

LTC3255IDD Datasheet

Step-Down Charge Pump

No Preview Available !

LTC3255
ABSOLUTE MAXIMUM RATINGS (Notes 1, 2)
VIN, EN......................................................... –52V to 60V
VOUT........................................................................... 15V
VOUT Short-Circuit Duration (Note 6)................ Indefinite
IVOUT When VOUT < 0V (Note 4)..............................50mA
FB ..............................................................................±6V
PGOOD....................................................................... 15V
IPGOOD When VPGOOD < 0V (Note 5)......................100µA
Operating Junction Temperature
Range (Notes 3, 6).................................. –55°C to 150°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
MSE Only........................................................... 300°C
PIN CONFIGURATION
C+ 1
VOUT 2
FB 3
SHUNT 4
PGOOD 5
TOP VIEW
10 VIN
9 C
11
GND
8 GND
7 BIAS
6 EN
DD PACKAGE
10-LEAD (3mm × 3mm) PLASTIC DFN
TJMAX = 150°C, θJA = 43°C/W
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
C+ 1
VOUT 2
FB 3
SHUNT 4
PGOOD 5
TOP VIEW
11
GND
10
9
VCI–N
8 GND
7 BIAS
6 EN
MSE PACKAGE
10-LEAD PLASTIC MSOP
TJMAX = 150°C, θJA = 40°C/W
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3255EDD#PBF
LTC3255EDD#TRPBF LGHD
10-Lead (3mm × 3mm) Plastic DFN
–40°C to 125°C
LTC3255IDD#PBF
LTC3255IDD#TRPBF
LGHD
10-Lead (3mm × 3mm) Plastic DFN
–40°C to 125°C
LTC3255HDD#PBF
LTC3255HDD#TRPBF LGHD
10-Lead (3mm × 3mm) Plastic DFN
–40°C to 150°C
LTC3255MPDD#PBF
LTC3255MPDD#TRPBF LGHD
10-Lead (3mm × 3mm) Plastic DFN
–55°C to 150°C
LTC3255EMSE#PBF
LTC3255EMSE#TRPBF LTGHF
10-Lead Plastic MSOP
–40°C to 125°C
LTC3255IMSE#PBF
LTC3255IMSE#TRPBF LTGHF
10-Lead Plastic MSOP
–40°C to 125°C
LTC3255HMSE#PBF
LTC3255HMSE#TRPBF LTGHF
10-Lead Plastic MSOP
–40°C to 150°C
LTC3255MPMSE#PBF
LTC3255MPMSE#TRPBF LTGHF
10-Lead Plastic MSOP
–55°C to 150°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on nonstandard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
3255f
2
For more information www.linear.com/LTC3255


Part Number LTC3255IDD
Description Step-Down Charge Pump
Maker Linear
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LTC3255IDD Datasheet PDF






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