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Linear Technology Electronic Components Datasheet

LTC3103 Datasheet

300mA Synchronous Step-Down DC/DC Converter

No Preview Available !

FEATURES
nn Ultralow Quiescent Current: 1.8µA
nn Synchronous Rectification: Efficiency Up to 95%
nn Wide VIN Range: 2.5V to 15V
nn Wide VOUT Range: 0.6V to 13.8V
nn 300mA Output Current
nn User-Selectable Automatic Burst Mode® or Forced
Continuous Operation
nn Accurate and Programmable RUN Pin Threshold
nn 1.2MHz Fixed Frequency PWM
nn Internal Compensation
nn Power Good Status Output for VOUT
nn Available in Thermally Enhanced 3mm × 3mm ×
0.75mm, 10-Pin DFN and 10-Pin MSOP Packages
APPLICATIONS
nn Remote Sensor Networks
nn Distributed Power Systems
nn Multicell Battery or SuperCap Regulator
nn Energy Harvesters
nn Portable Instruments
nn Low Power Wireless Systems
LTC3103
1.8µA Quiescent Current,
15V, 300mA Synchronous
Step-Down DC/DC
Converter
DESCRIPTION
The LTC®3103 is a high efficiency, monolithic synchronous
step-down converter using a current mode architecture
capable of supplying 300mA of output current.
The LTC3103 offers two operational modes: automatic
Burst Mode operation and forced continuous mode allow-
ing the user the ability to optimize output voltage ripple,
noise and light load efficiency. With Burst Mode operation
enabled, the typical DC input supply current at no load
drops to 1.8µA maximizing the efficiency for light loads.
Selection of forced continuous mode provides very low
noise constant frequency, 1.2MHz operation.
Additionally, the LTC3103 includes an accurate RUN com-
parator, thermal overload protection, a power good output
and an integrated soft-start feature to guarantee that the
power system start-up is well controlled.
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners.
TYPICAL APPLICATION
3V TO 15V
10µF
VIN BST
MODE SW
LTC3103
RUN PGOOD
VCC FB
GND
1µF
0.022µF 10µH
2.2V
300mA
1.78M
27pF
665k
47µF
3103 TA01a
Efficiency vs Output Current
100
95 100
90
85
80 10
75
70
65
60
55
50
0.0001
1
0.001
0.01
VIN = 3V
VIN = 5V
VIN = 10V
VIN = 15V
0.1
0.1 1
OUTPUT CURRENT (A)
3103 TA01b
For more information www.linear.com/LTC3103
3103fa
1


Linear Technology Electronic Components Datasheet

LTC3103 Datasheet

300mA Synchronous Step-Down DC/DC Converter

No Preview Available !

LTC3103
ABSOLUTE MAXIMUM RATINGS (Note 1)
VIN.............................................................. –0.3V to 18V
SW................................................. –0.3V to (VIN + 0.3V)
FB ................................................................. –0.3V to 6V
BST......................................... (SW – 0.3V) to (SW + 6V)
RUN, MODE ................................................ –0.3V to VIN
VCC, PGOOD.................................................. –0.3V to 6V
Operating Junction Temperature Range
(Notes 2, 3)............................................. –40°C to 125°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
MSE Only........................................................... 300°C
PIN CONFIGURATION
TOP VIEW
VIN
SW
BST
GND
PGOOD
1
2
3
4
5
10 MODE
9 NC
11
GND
8 FB
7 RUN
6 VCC
DD PACKAGE
10-LEAD (3mm × 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 58°C/W, θJC = 10°C/W
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
TOP VIEW
VIN 1
10 MODE
SW 2
BST 3
GND 4
11
GND
9 NC
8 FB
7 RUN
PGOOD 5
6 VCC
MSE PACKAGE
10-LEAD PLASTIC MSOP
TJMAX = 125°C, θJA = 40°C/W, θJC = 5.0°C/W
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION http://www.linear.com/product/LTC3103#orderinfo
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3103EDD#PBF
LTC3103EDD#TRPBF
LFXH
10-Lead (3mm × 3mm) Plastic DFN
–40°C to 125°C
LTC3103IDD#PBF
LTC3103IDD#TRPBF
LFXH
10-Lead (3mm × 3mm) Plastic DFN
–40°C to 125°C
LTC3103EMSE#PBF
LTC3103EMSE#TRPBF LTFXJ
10-Lead Plastic MSOP
–40°C to 125°C
LTC3103IMSE#PBF
LTC3103IMSE#TRPBF LTFXJ
10-Lead Plastic MSOP
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
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/. Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
E LECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = 10V unless otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX
Step-Down Converter
Input Voltage Range
After Start-Up
l 2.6
l 2.5
15
Input Undervoltage Lockout Threshold
Input Undervoltage Lockout Hysteresis
VVIINN
Rising
Rising,
TJ
=
0°C
to
85°C
(Note
4)
(Note 4)
l 2.1 2.6
2.1 2.5
0.4
UNITS
V
V
V
V
V
3103fa
2 For more information www.linear.com/LTC3103


Part Number LTC3103
Description 300mA Synchronous Step-Down DC/DC Converter
Maker Linear Technology
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LTC3103 Datasheet PDF






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