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
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