LTC3104
4
3104fa
For more information www.linear.com/LTC3104
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 LTC3104 is tested under pulsed load conditions such that
T
J
≈ T
A
. The LTC3104E 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
LTC3104I 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.
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
= V
INLDO
= 10V unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
LDO Feedback Input Current
l
1 20 nA
Dropout Voltage (V
DO
) I
LDO
= 10mA 150 mV
Output Current
l
10 mA
Output Current—Short Circuit V
LDO
= 0V
l
15 20 mA
Quiescent Current, V
INLDO
V
IN
= V
INLDO
= RUNLDO = 10V 0.3 µA
Line Regulation V
INLDO
= 2.5V to 15V, I
LDO
= 1mA 0.1 %
Load Regulation I
LDO
= 1mA to 10mA 0.75 %
RUNLDO Threshold
l
0.5 0.8 1.2 V
RUNLDO Input Current RUNLDO = 1.2V 0.01 0.3 µA
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 LTC3104 has a proprietary test mode that allows testing in a
feedback loop which servos V
FB
to the balance point for the error amplifier.
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency vs Output Current
Efficiency vs Input Voltage
(Automatic Burst Mode Operation)
Application No-Load Input Current
vs Supply Voltage (Automatic
Burst Mode Operation)
T
A
= 25°C unless otherwise noted
OUTPUT CURRENT (A)
65
EFFICIENCY (%)
95
60
55
90
75
85
80
70
0.0001 0.01 0.1 1
50
0.001
V
IN
= 4V
V
IN
= 7V
V
IN
= 10V
V
IN
= 15V
V
OUT
= 3.3V
L = 15µH
INPUT VOLTAGE (V)
2
EFFICIENCY (%)
95
8
80
70
4 6 10
65
50
60
55
90
85
75
12 14 16
V
OUT
= 2.2V
L = 10µH
I
LOAD
= 300mA
I
LOAD
= 100mA
I
LOAD
= 10mA
I
LOAD
= 1mA
I
LOAD
= 100µA
INPUT VOLTAGE (V)
0
2.0
2.5
3.0
3.5
2 4 6 8
10 12 14 16 18
FRONT PAGE APPLICATION
LDO ENABLED
