LTC3025-1 Datasheet, PDF (4/12 Pages) Linear Technology – 500mA Micropower VLDO Linear Regulators

LTC3025-1/LTC3025-2/
LTC3025-3/LTC3025-4
ELECTRICAL CHARACTERISTICS _{The l denotes the specifications which apply over the full operating}
temperature range, otherwise specifications are at T_A = 25°C. V_IN = 1.5V, V_BIAS = 3.6V, C_OUT = 1μF, C_IN = 0.1μF, C_BIAS = 0.1μF
(all capacitors ceramic) unless otherwise noted.
PARAMETER
V_IH SHDN Input High Voltage
V_IL SHDN Input Low Voltage
I_IH SHDN Input High Current
I_L SHDN Input Low Current
CONDITIONS
SHDN = 1.2V
SHDN = 0V
MIN TYP MAX UNITS
l 0.9
V
l
0.3
V
–1
1
μA
–1
1
μA
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: 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.
Note 3: The LTC3025-X regulators are tested and specified under pulse
load conditions such that T_J ≈ T_A. The LTC3025E-X are guaranteed to
meet performance specifications from 0°C and 125°C. Specifications over
the –40°C to 125°C operating junction temperature range are assured by
design, characterization and correlation with statistical process controls.
The LTC3025I-X are guaranteed to meet performance specifications over
the full –40°C to 125°C operating junction temperature range.
Note 4: For the LTC3025-1, a regulated output voltage will only be available
when the minimum IN and BIAS operating voltages as well as the IN to
OUT and BIAS to OUT dropout voltages are all satisfied. For the
LTC3025-2/LTC3025-3/LTC3025-4 the minimum IN operating voltage
assumes I_OUT = 500mA. For correct regulation at I_OUT < 500mA the
minimum IN operating voltage decreases to the maximum V_SENSE
Regulation Voltage as I_OUT decreases to 0mA (i.e. V_INMIN = 1.312V at I_OUT
= 250mA for the LTC3025-2).
Note 5: 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 6: Dropout voltage is 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.
TYPICAL PERFORMANCE CHARACTERISTICS (T_A = 25°C unless otherwise noted)
V_IN to V_OUT Dropout Voltage
vs I_OUT
120 _{VBIAS = 2.8V}
V_IN = 1.4V
100
T_A = 125°C
80
T_A = 25°C
60
40
T_A = –40°C
20
0
0 50 100 150 200 250 300 350 400 450 500
I_OUT (mA)
30251234 G01
Operating BIAS Current
vs Output Current
500
450
400
350
300
125°C
250
25°C
–40°C
200
150
100
50
0
0.01 0.1
1
10
I_OUT (mA)
100 1000
30251234 G02
BIAS No Load Operating Current
80
V_IN = 1.5V
70 ^{VOUT = 1.2V}
60
50
125°C
40
–40°C
25°C
30
20
10
0
2.5 3 3.5 4 4.5 5 5.5
V_BIAS (V)
30251234 G03
4
30251234fc