Datasheet

7
LTC3728
3728fc
Current Sense Pin Input Current
vs Temperature
EXTV
CC
Switch Resistance
vs Temperature
TEMPERATURE (°C)
–50 –25
25
CURRENT SENSE INPUT CURRENT (µA)
29
35
0
50
75
3728 G26
27
33
31
25
100
125
V
OUT
= 5V
TEMPERATURE (°C)
–50 –25
0
EXTV
CC
SWITCH RESISTANCE (Ω)
4
10
0
50
75
3728 G27
2
8
6
25
100
125
Oscillator Frequency
vs Temperature
TEMPERATURE (°C)
–50
400
500
700
25 75
3728 G28
300
200
–25 0
50 100 125
100
0
600
FREQUENCY (kHz)
V
PLLFLTR
= 5V
V
PLLFLTR
= 1.2V
V
PLLFLTR
= 0V
Undervoltage Lockout
vs Temperature
TEMPERATURE (°C)
–50
UNDERVOLTAGE LOCKOUT (V)
3.40
3.45
3.50
25 75
3728 G29
3.35
3.30
–25 0
50 100 125
3.25
3.20
Shutdown Latch Thresholds
vs Temperature
TEMPERATURE (°C)
–50 –25
0
SHUTDOWN LATCH THRESHOLDS (V)
0.5
1.5
2.0
2.5
75 10050
4.5
3728 G30
1.0
0 25 125
3.0
3.5
4.0
LATCH ARMING
LATCHOFF
THRESHOLD
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Input Source/Capacitor
Instantaneous Current (Figure 13)
I
IN
2A/DIV
V
IN
200mV/DIV
V
SW1
10V/DIV
V
IN
= 15V 1µs/DIV 3728 G22
V
OUT
= 5V
V
PLLFLTR
= 0V
I
OUT5
= I
OUT3.3
= 2A
Burst Mode Operation (Figure 13)
V
OUT
20mV/DIV
I
L
0.5A/DIV
V
IN
= 15V 10µs/DIV 3728 G23
V
OUT
= 5V
V
PLLFLTR
= 0V
V
FCB
= OPEN
I
OUT
= 20mA
Constant Frequency (Burst Inhibit)
Operation (Figure 13)
V
OUT
20mV/DIV
I
L
0.5A/DIV
V
IN
= 15V 2µs/DIV 3728 G24
V
OUT
= 5V
V
PLLFLTR
= 0V
V
FCB
= 5V
I
OUT
= 20mA
V
SW2
10V/DIV