LTC1844-1.5 LINER [Linear Technology], LTC1844-1.5 Datasheet - Page 4

• Manufacturer Part Number: LTC1844-1.5
• Description: 150mA, Micropower, Low Noise, VLDO Linear Regulator
• Manufacturer: LINER [Linear Technology]

ELECTRICAL CHARACTERISTICS
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC1844 is tested and specified under pulse load conditions
such that T
specifications from 0 C to 70 C. Specifications over the – 40 C to 125 C
operating junction temperature range are assured by design,
characterization and correlation with statistical process controls.
Note 3: The LTC1844 adjustable versions are tested and specifed for these
conditions with the ADJ pin connected to the OUT pin for a V
of 1.252V.
Note 4: 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 5: The LTC1844’s high precision degrades slightly at high
temperatures (T
voltage versions have been split into higher and lower accuracy input
voltage ranges to reflect this.
LTC1844 Series
SYMBOL
I
e
V
t
T
I
I
I
V
V
4
temperature range, otherwise specifications are at T
LIM
DELAY
ADJ
IRL
ORL
n
SHDN
SHDN
OSH
RP
T
SHDN
J
PARAMETER
Output Current Limit
Output Voltage Noise
SHDN Input Threshold
Shutdown Exit Delay
Thermal Shutdown Limit
Thermal Shutdown Hysteresis
ADJ Pin Bias Current
Input Reverse Leakage Current
Output Reverse Leakage Current
(Note 9)
Start-Up Overshoot
Output Ripple Rejection
T
A
J
. The LTC1844E is guaranteed to meet performance
> 70 C) with input voltages below 2.2V. The lower output
CONDITIONS
f = 10Hz to 100kHz, C
f = 10Hz to 100kHz, C
C
C
(Notes 3, 8)
LTC1844-3.3, LTC1844-2.8, LTC1844-2.5, LTC1844-1.8,
LTC1844-1.5, V
LTC1844-BYP, LTC1844-SD, V
V
V
R
(V
f
RIPPLE
BP
BP
IN
IN
L
IN
= 1k, SHDN Rise Time 1 s
= 0V, V
= 0V, V
= 0.01 F, C
= 0.01 F, C
– V
= 120Hz, I
OUT
OUT
OUT
) = 1V (Avg), V
OUT(NOMINAL)
A
= 25 C. V
= V
= V
OUT
OUT
IN
LOAD
= –5V, V
OUT(NOMINAL)
OUT(NOMINAL)
The
= 1 F, No load
= 1 F, No load
BP
BP
= 100mA
= 0.1 F, C
= 0.1 F, C
IN
RIPPLE
OUT
denotes specifications which apply over the full operating
= V
= 0V
IN
OUT
Note 6: To ensure adequate input supply voltage, the LTC1844 adjustable
versions are tested and specified for these conditions with an external
resistor divider (two 100k resistors) for an output voltage of 2.504V. The
external resistor divider will add a 5 A load on the output.
Note 7: Dropout voltage is (V
its nominal value measured at V
LTC1844-3.3 is tested by measuring the V
lowered until V
(V
Note 8: ADJ pin bias current flows into the ADJ pin.
Note 9: Output reverse leakage current is tested with the IN pin grounded
and the OUT pin forced to the rated output voltage.
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.
= 0.5V
= –5V, V
IN
OUT
OUT
+ 0.5V, unless otherwise noted. (Note 2)
– V
= 1 F, I
= 10 F, I
P-P
OUT
OUT
,
) is then measured and defined as V
= 0V
L
OUT
L
= 150mA
= 150mA
falls 100mV below the measured value. The difference
IN
– V
IN
= V
OUT
0.35
MIN
160
OUT
) when V
+ 0.5V. For example, the
OUT
at V
1000
OUT
0.65
0.01
TYP
350
155
200
35
30
70
10
30
60
DO
2
IN
.
falls to 100mV below
= 3.8V, then V
1500
MAX
100
200
100
500
0.9
0.1
1.2
IN
%V
UNITS
is
V
V
1844ia
RMS
RMS
OUT
mA
nA
dB
V
C
C
A
A
A
A
s
s