3
LT3012B
3012bf
PARAMETER CONDITIONS MIN TYP MAX UNITS
Dropout Voltage I
LOAD
= 10mA 160 230 mV
V
IN
= V
OUT(NOMINAL)
I
LOAD
= 10mA ● 300 mV
(Notes 4, 5) I
LOAD
= 50mA 250 340 mV
I
LOAD
= 50mA ● 420 mV
I
LOAD
= 250mA 400 490 mV
I
LOAD
= 250mA ● 620 mV
GND Pin Current I
LOAD
= 0mA ● 40 100 µA
V
IN
= 4.5V I
LOAD
= 100mA 3 mA
(Notes 4, 6) I
LOAD
= 250mA ● 10 18 mA
Output Voltage Noise C
OUT
= 10µF, I
LOAD
= 250mA, BW = 10Hz to 100kHz 100 µV
RMS
ADJ Pin Bias Current (Note 7) 30 100 nA
Ripple Rejection V
IN
= 7V(Avg), V
RIPPLE
= 0.5V
P-P
, f
RIPPLE
= 120Hz, I
LOAD
= 250mA 65 75 dB
Current Limit V
IN
= 7V, V
OUT
= 0V 400 mA
V
IN
= 4.5V, ∆V
OUT
= –0.1V (Note 2) ● 270 mA
Reverse Output Current (Note 8) V
OUT
= 1.24V, V
IN
< 1.24V (Note 2) 12 25 µA
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are at T
J
= 25°C.
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 LT3012B is tested and specified for these conditions with the
ADJ pin connected to the OUT pin.
Note 3: Operating conditions are limited by maximum junction
temperature. The regulated output voltage specification will not apply for
all possible combinations of input voltage and output current. When
operating at maximum input voltage, the output current range must be
limited. When operating at maximum output current, the input voltage
range must be limited.
Note 4: To satisfy requirements for minimum input voltage, the LT3012B
is tested and specified for these conditions with an external resistor divider
(249k bottom, 549k top) for an output voltage of 4V. The external resistor
divider will add a 5µA DC load on the output.
Note 5: Dropout voltage is the minimum input to output voltage differential
needed to maintain regulation at a specified output current. In dropout, the
output voltage will be equal to (V
IN
– V
DROPOUT
).
Note 6: GND pin current is tested with V
IN
= 4.5V and a current source
load. This means the device is tested while operating close to its dropout
region. This is the worst-case GND pin current. The GND pin current will
decrease slightly at higher input voltages.
Note 7: ADJ pin bias current flows into the ADJ pin.
Note 8: Reverse output current is tested with the IN pin grounded and the
OUT pin forced to the rated output voltage. This current flows into the OUT
pin and out the GND pin.
Note 9: The LT3012BE is guaranteed to meet performance specifications
from 0°C to 125°C operating 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.
Note 10: This IC includes overtemperature protection that is intended to
protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is
active. Continuous operation above the specified maximum operating
junction temperature may impair device reliability.
