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LT1579IGN-3#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
7
LT1579
TYPICAL PERFORMANCE CHARACTERISTICS
U
W
Logic Flag Output Voltage
(Output Low)
Logic Flag Output Voltage
(Output Low)
TEMPERATURE (°C)
–50
LOGIC FLAG OUTPUT VOLTAGE (V)
0.8
1.0
1.2
25 75
1579 G21
0.6
0.4
–25 0
50 100 125
0.2
0
I
SINK
= 5mA
I
SINK
= 20µA
LOGIC FLAG SINK CURRENT
0.2
LOGIC FLAG OUTPUT VOLTAGE (V)
0.4
0.6
0.5
0.8
1.0
0.1
0.3
0.7
0.9
1µA10µA 100µA 1mA 10mA
1579 G20
0
OUTPUT CURRENT (mA)
0
GROUND PIN CURRENT (mA)
3
4
5
150
250
1579 G37
2
1
0
50 100 200
6
7
8
300
V
IN1
= V
IN2
= V
OUT(NOMINAL)
+ 1V
Ground Pin Current Minimum Input Voltage
TEMPERATURE (°C)
–50
2.0
MINIMUM INPUT VOLTAGE (V)
2.1
2.3
2.4
2.5
3.0
2.7
0
50
75
1579 G14
2.2
2.8
2.9
2.6
–25
25
100
125
Shutdown Pin Threshold
TEMPERATURE (°C)
–50 –25
0
SHUTDOWN PIN THRESHOLD (V)
0.4
1.0
0
50
75
1579 G15
0.2
0.8
0.6
25
100
125
I
LOAD
= 1mA
Secondary Select Threshold
(Switch to V
IN1
)
TEMPERATURE (°C)
–50
0
SECONDARY SELECT PIN THRESHOLD (V)
0.2
0.6
0.8
1.0
2.0
1.4
0
50
75
1579 G18
0.4
1.6
1.8
1.2
–25
25
100
125
I
LOAD
= 300mA
I
LOAD
= 1mA
Secondary Select Threshold
(Switch to V
IN2
)
TEMPERATURE (°C)
–50
0
SECONDARY SELECT PIN THRESHOLD (V)
0.2
0.6
0.8
1.0
2.0
1.4
0
50
75
1579 G17
0.4
1.6
1.8
1.2
–25
25
100
125
I
LOAD
= 1mA
TEMPERATURE (°C)
–50 –25
0
SHUTDOWN PIN CURRENT (µA)
1.0
2.5
0
50
75
1579 G16
0.5
2.0
1.5
25
100
125
V
SHDN
= 0V
Shutdown Pin Current
Secondary Select Pin Current
TEMPERATURE (°C)
–50
0
SECONDARY SELECT PIN CURRENT (µA)
0.1
0.3
0.4
0.5
1.0
0.7
0
50
75
1579 G19
0.2
0.8
0.9
0.6
–25
25
100
125
V
SS
= 0V
8
LT1579
TYPICAL PERFORMANCE CHARACTERISTICS
U
W
Logic Flag Input Current
(Output High)
Current LimitCurrent Limit
INPUT VOLTAGE (V)
0
CURRENT LIMIT (A)
0.4
0.5
0.6
35
1579 G29
0.3
0.2
12
467
0.1
0
V
OUT
= 0V
ADJUST PIN VOLTAGE (V)
0
ADJUST PIN INPUT CURRENT (mA)
0.6
0.8
1.0
1.6
1579 G28
0.4
0.2
0.5
0.7
0.9
0.3
0.1
0
0.4
0.8
1.2
0.2 1.8
0.6
1.0
1.4
2.0
T
J
= 25°C
V
IN1
= V
IN2
= 0V
Adjust Pin Input Current
Low-Battery Comparator
Hysteresis
TEMPERATURE (°C)
–50 –25
0
COMPARATOR HYSTERESIS (mV)
10
25
0
50
75
1579 G25
5
20
15
25
100
125
I
LBO(SINK)
= 50µA
LOGIC FLAG VOLTAGE (V)
0
0
LOGIC FLAG INPUT CURRENT (mA)
5
15
20
25
2
4
59
1579 G22
10
13
6
7
8
CONTROL PIN VOLTAGE (V)
0
0
CONTROL PIN INPUT CURRENT (mA)
5
15
20
25
2
4
59
1579 G23
10
13
6
7
8
Control Pin Input Current
Low-Battery Comparator
Hysteresis
I
LBO
SINK CURRENT (µA)
0
COMPARATOR HYSTERESIS (mV)
10
15
40
1579 G24
5
0
10
20
30
50
20
Reverse Output Current
TEMPERATURE (°C)
–50
0
REVERSE OUTPUT CURRENT (µA)
2
6
8
10
20
14
0
50
75
1579 G27
4
16
18
12
–25
25
100
125
V
IN1
= V
IN2
= 0V
V
OUT
= 3V (LT1579-3)
V
OUT
= 3.3V (LT1579-3.3)
V
OUT
= 5V (LT1579-5)
Reverse Output Current
OUTPUT VOLTAGE (V)
0
0
REVERSE OUTPUT CURRENT (µA)
5
15
20
25
2
4
59
1579 G26
10
13
6
7
8
T
J
= 25°C
V
IN1
= V
IN2
= 0V
CURRENT FLOWS INTO
OUTPUT PIN
LT1579-3.3
LT1579-3
LT1579-5
TEMPERATURE (°C)
–50
0.4
0.5
0.7
25 75
1579 G38
0.3
0.2
–25 0
50 100 125
0.1
0
0.6
CURRENT LIMIT (A)
V
IN1
= V
IN2
= V
OUT(NOMINAL)
+ 1V
∆V
OUT
= –0.1V
TYPICAL
GUARANTEED
9
LT1579
TYPICAL PERFORMANCE CHARACTERISTICS
U
W
FREQUENCY (Hz)
10
40
RIPPLE REJECTION (dB)
50
60
70
80
100 1k 10k 100k 1M
1579 G30
30
20
10
0
90
100
C
OUT
= 47µF
SOLID
TANTALUM
C
OUT
= 4.7µF
SOLID
TANTALUM
I
LOAD
= 150mA
V
IN
= 6V + 50mV
RMS
RIPPLE
Ripple Rejection
PIN FUNCTIONS
UUU
V
IN1
: The primary power source is connected to V
IN1
. A
bypass capacitor is required on this pin if the device is
more than six inches away from the main input filter
capacitor. In general, the output impedance of a battery
rises with frequency, so it is advisable to include a bypass
capacitor in battery-powered circuits. A bypass capacitor
in the range of 1µF to 10µF is sufficient.
V
IN2
: The secondary power source is connected to V
IN2
.
A bypass capacitor is required on this pin if the device is
more than six inches away from the main input filter
capacitor. In general, the output impedance of a battery
rises with frequency, so it is advisable to include a bypass
capacitor in battery-powered circuits. A bypass capacitor
in the range of 1µF to 10µF is sufficient.
OUT: The output supplies power to the load. A minimum
output capacitor of 4.7µF is required to prevent oscilla-
tions. Larger output capacitors will be required for appli-
cations with large transient loads to limit peak voltage
transients.
ADJ: For the adjustable LT1579, this is the input to the
error amplifier. This pin is internally clamped to 7V and
–0.6V (one V
BE
). It has a bias current of 6nA which flows
6V
5V
V
IN1
V
OUT
50mV/DIV
UNPLUG
V
IN1
REPLACE
V
IN1
LT1579-5 “Hot” Plugging and
Unplugging Transient Response
TIME (ms)
0
OUTPUT VOLTAGE
DEVIATION (mV)LOAD CURRENT (mA)
–50
50
0.8
1579 G34
200
–100
0
100
300
100
0.2
0.4
0.6
0.1 0.9
0.3
0.5
0.7
1,0
V
IN
= 6V
C
IN
= 1µF CERAMIC
C
OUT
= 22µF TANTALUM
LT1579-5 Transient Response
LT1579-5 Transient Response
TIME (µs)
0
OUTPUT VOLTAGE
DEVIATION (mV)LOAD CURRENT (mA)
–50
50
400
1579 G33
100
50
–100
0
100
75
25
0
100
200
300
50 450
150
250
350
500
V
IN
= 6V
C
IN
= 1µF CERAMIC
C
OUT
= 4.7µF TANTALUM
Load Regulation
TEMPERATURE (°C)
–50
LOAD REGULATION (mV)
–2
25
1579 G40
–8
–12
–25 0 50
–14
–16
0
–4
–6
–10
75 100 125
∆I
LOAD
= 1mA TO 300mA
LT1579
LT1579-5
LT1579-3.3
LT1579-3
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LT1579IGN-3#PBF

Mfr. #:
Buy LT1579IGN-3#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
LDO Voltage Regulators 300mA Dual Input Smart LDO 3V
Lifecycle:
New from this manufacturer.
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