Datasheet

5
LTC1755/LTC1756
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Power Efficiency vs Input Voltage
Card Detection Debounce Period
vs Temperature
V
IN
INPUT VOLTAGE (V)
3
0
EFFICIENCY (%)
25
50
75
100
45
17556 G01
6
I
L
= 35mA
T
A
= 25°C
V
CC
= 3V
V
CC
= 5V
TEMPERATURE (°C)
–50
0
DEBOUNCE DELAY (ms)
25
50
75
100
150
–25
02550
17556 G02
75 100
125
C
FLY
= 0.68µF
V
IN
= 6V
V
IN
= 3.3V
V
IN
= 2.7V
TEMPERATURE (°C)
–50
3.3
I/O, AUX1, AUX2 SHORT-CIRCIUT CURRENT (mA)
3.4
3.5
3.6
–25
02550
17556 G03
75 100
V
CC
= 5V
V
IN
= 3V
I/O, AUX1, AUX2 Short-Circuit
Current vs Temperature
CARD, READY, ALARM Pull-Up
Current vs Temperature
TEMPERATURE (°C)
–50
0
PULL-UP CURRENT (µA)
2
4
6
8
10
–25
02550
17556 G04
75 100
DV
CC
= 5.5V
DV
CC
= 3V DV
CC
= 2V
DV
CC
INPUT VOLTAGE (V)
2
PULL-UP CURRENT (µA)
8
10
12
17556 G05
6
4
3
45
2
0
V
PRES
= 0V
T
A
= 25°C
DV
CC
INPUT VOLTAGE (V)
1
5
INPUT CURRENT (µA)
10
15
20
25
35
2
345
17556 G02
67
30
V
PRES
= 0V
T
A
= –40°CT
A
= 25°C
T
A
= 85°C
PRES Pin Pull-Up Current vs DV
CC
DV
CC
Input Current vs DV
CC
Voltage
Oscillator Frequency
vs Temperature
TEMPERATURE (°C)
–50
500
OSCILLATOR FREQUENCY (kHz)
600
700
800
900
1100
–25
02550
17556 G07
75 100
1000
V
IN
= 5V
V
IN
= 3.3V
V
IN
= 2.7V
Oscillator Frequency
vs Input Voltage
V
IN
INPUT VOLTAGE (V)
2.5
500
OSCILLATOR FREQUENCY (kHz)
600
700
800
900
1100
3.0
3.5 4.0 4.5
17556 G07
5.0 5.5
1000
T
A
= 85°C
T
A
= 25°C
T
A
= –40°C
V
IN
Supply Current
vs Temperature
TEMPERATURE (°C)
–50
40
SUPPLY CURRENT (µA)
50
60
70
–25
02550
17556 G09
75 100
V
IN
= 3.3V
I
CC
= 0