LT1175I Linear Technology, LT1175I Datasheet - Page 4

• Manufacturer Part Number: LT1175I
• Description: 500mA Negative Low Dropout Micropower Regulator
• Manufacturer: Linear Technology

LT1175
4
TYPICAL PERFORMANCE CHARACTERISTICS
1.0
0.8
0.6
0.4
0.2
1.0
0.8
0.6
0.4
0.2
25
20
15
10
0
5
0
0
0
Typical Current Limit
Characteristics
0
INPUT-TO-OUTPUT DIFFERENTIAL VOLTAGE (V)
0
Shutdown Input Current
Minimum Input-to-Output Voltage
CURRENT LIMIT CHANGES ONLY SLIGHTLY
WITH TEMPERATURE SO CURVES ARE
REPRESENTATIVE OF ALL TEMPERATURES
I
T
V
UNTIL OUTPUT
VOLTAGE
DROPS 1%
LIM2
I
J
IN
LIM2
I
I
0.1
= 25 C
I
LIM2
LIM2
LIM4
REDUCED
, I
, I
OPEN
5
5
LIM
, I
LIM4
TIED TO V
TIED TO V
LIM4
0.2
OUTPUT CURRENT (A)
TIED TO V
INPUT VOLTAGE (V)
I
TIED TO V
T
LIM2
J
OPEN
= 125 C
10
10
0.3
, I
IN
IN
LIM4
IN
I
LIM2
IN
0.4
TO V
15
15
TIED
IN
T
J
0.5
T
= –55 C
J
= 25 C
I
TO V
W
LIM4
20
20
0.6
IN
TIED
1175 G04
1175 G07
1175 G01
U
0.7
25
25
0.6
0.5
0.4
0.3
0.2
0.1
1.0
0.8
0.6
0.4
0.2
2.5
2.0
1.5
1.0
0.5
0
0
0
–50
INPUT-TO-OUTPUT DIFFERENTIAL VOLTAGE (V)
0
0
Guaranteed Current Limit
Minimum Input-to-Output Voltage
Shutdown Thresholds
I
LIM2
I
I
I
V
VOLTAGE DROPS 1%.
I
LIM4
LIM2
LIM2
DEVICE IS OFF
BELOW THRESHOLD
LIM2
IN
NEGATIVE THRESHOLD
–25
0.1
, I
REDUCED UNTIL OUTPUT
, I
, I
TIED TO V
TIED TO V
LIM
5
LIM4
LIM4
TIED TO V
0.2
OUTPUT CURRENT (A)
0
TEMPERATURE ( C)
OPEN
TIED TO V
POSITIVE THRESHOLD
T
10
IN
IN
J
T
0.3
25
= 125 C
J
= –55 C
IN
IN
0.4
50
15
CURVES REPRE-
SENT MINIMUM
GUARANTEED
LIMITS AT ALL
TEMPERATURES
0.5
75
20
T
J
100
0.6
= 25 C
1175 G02
1175 G05
1175 G08
125
0.7
25
5.05
5.00
4.95
3.84
3.80
3.76
100
–10
80
60
40
20
–5
15
10
0
5
0
–25 –20
–50
–50
Output Voltage Temperature Drift
SENSE Bias Current
(Adjustable Part)
SHDN Pin Characteristics
V
CHARACTERISTICS DO NOT
CHANGE SIGNIFICANTLY WITH
TEMPERATURE, SO A SINGLE
CURVE IS SHOWN. POSITIVE
CURRENT FLOWS INTO
SHDN PIN
FEEDBACK VOLTAGE
ADJUSTABLE PART
IN
FIXED 5V PART
SHUTDOWN TO GROUND VOLTAGE (V)
–25
–25
= 25V
IF SHDN PIN IS NEGATIVE WITH
RESPECT TO INPUT VOLTAGE AND
INPUT VOLTAGE IS LESS THAN 15V,
NEGATIVE BREAKOVER POINT WILL
BE ABOUT 8V BELOW –V
OUTPUT
JUNCTION TEMPERATURE ( C)
–15
–10
0
0
TEMPERATURE ( C)
–5
25
25
0
50
50
5
IN
75
75
10
15
100
100
1175 G03
1175 G06
20
1175 G09
125
125
25