Datasheet

4
LTC1540
sn1540 1540fas
TYPICAL PERFORMANCE CHARACTERISTICS
UW
TEMPERATURE (°C)
–60
0
SUPPLY CURRENT (µA)
0.2
0.5
–20
20
40
1540 G01
0.1
0.4
0.3
–40 0
60
80
100
V
+
= 5V
V
–
= GND = 0V
V
+
= 2V
V
–
= GND = 0V
V
+
= 3V
V
–
= GND = 0V
Supply Current vs Temperature
Reference Voltage
Load Regulation (Source)
OUTPUT SOURCE CURRENT (mA)
0
0
∆V
REF
(mV)
2
5
1
2
1540 G04
1
4
3
3
4
V
+
= 5V
V
–
= GND = 0V
T
A
= 25°C
Comparator Short-Circuit Current
vs Supply Voltage
SUPPLY VOLTAGE (V)
0
CURRENT (mA)
120
160
200
8
1540 G07
80
40
100
140
180
60
20
0
2
4
6
19
3
5
7
10
T
A
= 25°C
OUTPUT
CONNECTED TO
V
–
= GND = 0V;
SOURCE
CURRENT
OUTPUT
CONNECTED
TO V
+
; SINK
CURRENT
V
REF
– V
HYST
(mV)
0
DIFFERENTIAL INPUT VOLTAGE (V)
80
60
40
20
0
–20
–40
–60
–80
40
1540 G09
10 20 30 50
Hysteresis Control
Comparator Output Voltage (Low)
vs Load Current
LOAD CURRENT (mA)
0
0
OUTPUT VOLTAGE (V)
1.0
2.5
20
40
1540 G06
0.5
2.0
1.5
60
80
10
30
50
70
T
A
= 25°C
V
+
= 5V
V
+
= 3V
V
+
= 2V
Reference Voltage
Load Regulation (Sink)
OUTPUT SINK CURRENT (µA)
0
0
∆V
REF
(mV)
1
3
4
5
10
7
10
20
25
1540 G03
2
8
9
6
515
30
35
40
V
+
= 5V
V
–
= GND = 0V
T
A
= 25°C
TEMPERATURE (°C)
–60
REFERENCE VOLTAGE (V)
1.182
1.184
1.186
80
100
1540 G02
1.180
1.178
1.172
–40
020–20
40 60
1.174
1.176
1.190
1.188
V
+
= 5V
V
–
= GND = 0V
Reference Voltage vs Temperature
Comparator Output Voltage (High)
vs Load Current
LOAD CURRENT (mA)
0
0
OUTPUT VOLTAGE (V)
2
5
20
40
1540 G05
1
4
3
60
80
10
30
50
70
T
A
= 25°C
V
+
= 5V
V
+
= 3V
V
+
= 2V
Comparator Response Time
vs Input Overdrive
INPUT VOLTAGE (mV)
TIME (µs)
60
70
80
80
1540 G08
50
40
55
65
75
45
35
30
20
40
60
10 90
30
50
70
100 110
T
A
= 25°C
V
+
= 5V
V
–
= GND = 0V
t
PLH
t
PHL