LTC3103
3
3103fa
For more information www.linear.com/LTC3103
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at T
A
= 25°C (Note 2). V
IN
= 10V unless otherwise noted.
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTC3103 is tested under pulsed load conditions such that
T
J
≈ T
A
. The LTC3103E is guaranteed to meet specifications from
0°C to 85°C junction temperature. Specifications over the –40°C to
125°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
LTC3103I is guaranteed over the full –40°C to 125°C operating junction
temperature range. The junction temperature (T
J
) is calculated from the
ambient temperature (T
A
) and power dissipation (P
D
) according to the
formula:
T
J
= T
A
+ (P
D
)(θ
JA
°C/W)
where θ
JA
is the package thermal impedance. Note the maximum ambient
temperature consistent with these specifications is determined by specific
operating conditions in conjunction with board layout, the rated package
thermal resistance and other environmental factors.
Note 3: This IC includes overtemperature protection that is intended to
protect the device during momentary overload conditions. The maximum
rated junction temperature will be exceeded when this protection is active.
Continuous operation above the specified absolute maximum operating
junction temperature may impair device reliability or permanently damage
the device.
Note 4: Specification is guaranteed by design.
Note 5: The LTC3103 has a proprietary test mode that allows testing in a
feedback loop which servos V
FB
to the balance point for the error amplifier.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Feedback Voltage (Note 5)
l
0.588 0.6 0.612 V
Feedback Voltage Line Regulation V
IN
= 2.5V to 15V (Note 5) 0.02 0.05 %/V
Feedback Input Current (Note 5)
l
1 20 nA
Oscillator Frequency
T
J
= 0°C to 85°C (Note 4)
l
0.930
1
1.2
1.2
1.55
1.45
MHz
MHz
Quiescent Current, V
IN
—Active RUN = V
IN
, MODE = 0V, FB > 0.612 Nonswitching 600 µA
Quiescent Current, V
IN
— Sleep RUN = V
IN
, FB > 0.612, MODE = V
IN
, T
J
= 0°C to 85°C (Note 4)
RUN = V
IN
, FB > 0.612, MODE = V
IN
l
1.8
1.8
2.6
3.3
µA
µA
Quiescent Current, V
IN
—Shutdown RUN = 0V, T
J
= 0°C to 85°C (Note 4)
RUN = 0V
l
1
1.8
1.7
3.3
µA
µA
N-Channel MOSFET Synchronous Rectifier
Leakage Current
V
IN
= V
SW
= 15V, V
RUN
= 0V 0.01 0.3 µA
N-Channel MOSFET Switch Leakage Current V
IN
= 15V, V
SW
= 0V, V
RUN
= 0V 0.01 0.3 µA
N-Channel MOSFET Synchronous
Rectifier R
DS(ON)
I
SW
= 200mA 0.85 Ω
N-Channel MOSFET Switch R
DS(ON)
I
SW
= –200mA 0.65 Ω
Peak Current Limit
l
0.40 0.50 0.75 A
PGOOD Threshold FB Falling, Percentage Below FB –14 –10 –5 %
PGOOD Hysteresis Percentage of FB 2 %
PGOOD Voltage Low I
PGOOD
= 100µA 0.2 V
PGOOD Leakage Current V
PGOOD
= 5V 0.01 0.3 µA
Maximum Duty Cycle
l
89 92 %
Switch Minimum Off Time (t
OFF(MIN)
) (Note 4) 65 ns
Synchronous Rectifier Minimum On Time
(t
ON(MIN)
)
(Note 4) 70 ns
RUN Pin Threshold RUN Pin Rising
l
0.76 0.80 0.85 V
RUN Pin Hysteresis 0.06 V
RUN Input Current RUN = 1.2V
l
0.01 0.4 µA
MODE Threshold
l
0.5 0.8 1.2 V
MODE Input Current MODE = 1.2V 0.1 4 µA
Soft-Start Time V
IN
= 5V 0.7 1.4 2.5 ms
