LT3085 LINER [Linear Technology], LT3085 Datasheet - Page 3

• Manufacturer Part Number: LT3085
• Description: Adjustable 500mA Single Resistor Low Dropout Regulator
• Manufacturer: LINER [Linear Technology]

ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifi cations are at T
PARAMETER
SET Pin Current
Output Offset Voltage (V
Load Regulation
Line Regulation
Minimum Load Current (Notes 3, 9)
V
V
V
Current Limit (Note 9)
Error Amplifi er RMS Output Noise (Note 6)
Reference Current RMS Output Noise (Note 6) 10Hz≤f≤100kHz
Ripple Rejection
Thermal Regulation, I
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. Unless otherwise specifi ed, all voltages are with respect to V
The LT3085 is tested and specifi ed under pulse load conditions such that
T
LT3085E over the full –40°C to 125°C operating junction temperature
range is assured by design, characterization, and correlation with
statistical process controls. The LT3085I regulators are guaranteed
over the full –40°C to 125°C operating junction temperature range. The
LT3085 (MP grade) is 100% tested and guaranteed over the –55°C to
125°C operating junction temperature range.
Note 3. Minimum load current is equivalent to the quiescent current of
the part. Since all quiescent and drive current is delivered to the output
of the part, the minimum load current is the minimum current required to
maintain regulation.
Note 4. For the LT3085, dropout is caused by either minimum control
voltage (V
specifi ed with respect to the output voltage. The specifi cations represent
the minimum input-to-output differential voltage required to maintain
regulation.
J
CONTROL
IN
CONTROL
≅ T
Dropout Voltage (Note 4)
A
. The LT3085E is 100% tested at T
CONTROL
Dropout Voltage (Note 4)
Pin Current (Note 5)
) or minimum input voltage (V
SET
OUT
– V
SET
)
ΔI
ΔI
ΔV
ΔV
I
V
SET
SET
SET
A
OS
OS
OS
= 25°C. Performance of the
CONDITIONS
V
V
V
V
ΔI
ΔI
ΔV
ΔV
V
V
I
I
I
I
I
I
V
I
f=120Hz, V
f=10kHz
f=1MHz
10ms Pulse
LOAD
LOAD
LOAD
LOAD
LOAD
LOAD
LOAD
IN
IN
IN
IN
IN
IN
IN
LOAD
LOAD
IN
IN
IN
= 1V, V
≥ 1V, V
= 1V, V
= 1V, V
= V
= V
= 5V, V
). Both parameters are
= 1V to 36V, ΔV
= 1V to 36V, ΔV
= 100mA
= 500mA
= 100mA
= 500mA
= 100mA
= 500mA
= 500mA, 10Hz≤f≤100kHz, C
CONTROL
CONTROL
= 1mA to 500mA
= 1mA to 500mA (Note 8)
CONTROL
CONTROL
CONTROL
CONTROL
CONTROL
RIPPLE
A
= 10V
= 36V
= 25°C (Note 2).
=0.5V
= 2V, I
≥ 2V, 1mA ≥ I
= 2V, I
= 2V, I
= 5V, V
CONTROL
CONTROL
The
P-P
OUT
, I
LOAD
LOAD
LOAD
.
SET
LOAD
l
denotes the specifi cations which apply over the full operating
= 1V to 36V, I
= 1V to 36V, I
= 0V, V
= 1mA, T
= 1mA, T
= 1mA
=0.1A, C
LOAD
Note 5. The V
output transistor. This current will track output current with roughly a 1:60
ratio. The minimum value is equal to the quiescent current of the device.
Note 6. Output noise is lowered by adding a small capacitor across the
voltage setting resistor. Adding this capacitor bypasses the voltage setting
resistor shot noise and reference current noise; output noise is then equal
to error amplifi er noise (see Applications Information section).
Note 7. The SET pin is clamped to the output with diodes through 1k
resistors. These resistors and diodes will only carry current under
transient overloads.
Note 8. Load regulation is Kelvin sensed at the package.
Note 9. Current limit includes foldback protection circuitry. Current limit
decreases at higher input-to-output differential voltages. See the Typical
Performance Characteristics graphs for more information.
Note 10. This IC includes over-temperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed the maximum operating junction temperature
when over-temperature protection is active. Continuous operation above
the specifi ed maximum operating junction temperature may impair device
reliability.
OUT
OUT
≥ 500mA (Note 9)
=10μF , C
SET
J
J
= -0.1V
= 25°C
= 25°C
=0.1μF, C
LOAD
LOAD
SET
CONTROL
= 1mA
= 1mA
=0.1μF
OUT
=2.2μF
pin current is the drive current required for the
l
l
l
l
l
l
l
l
l
l
l
MIN
–1.5
500
9.9
9.8
–3
0.003
0.003
–0.1
–0.6
1.35
TYP
300
275
650
0.1
1.2
0.7
10
10
85
33
90
75
20
3
8
LT3085
MAX
10.1
10.2
500
150
450
1.5
0.5
1.6
–1
15
3
1
6
μV
nA
UNITS
mV/V
3085fa
%/W
nA/V
3
RMS
RMS
mV
mV
mV
mA
mV
mV
mA
mA
mA
μA
μA
nA
μA
dB
dB
dB
V
V