Datasheet

LTC3617
5
3617fa
T
A
= 25°C, V
IN
= 3.3V, f
O
= 1MHz unless otherwise noted.
Sinking Current Internal Start-Up Tracking Up/Down
Switch On-Resistance
vs Input Voltage
Switch On-Resistance
vs Temperature
Frequency vs R
T
Resistor Frequency vs Temperature
V
OUT
/VTTR
500mV/DIV
PGOOD
5V/DIV
VDDQIN
2V/DIV
2ms/DIV
3617 G12
V
OUT
= 1.25V
I
LOAD
= 3A
INPUT VOLTAGE (V)
2.5
R
DS(0N)
(mΩ)
50
4.5
3617 G14
40
20
30
10
0
3.0
3.5
4.0
5.0 5.5
MAIN SWITCH
SYNCHRONOUS SWITCH
RESISTOR ON RT/SYNC PIN (kΩ)
0
0
FREQUENCY (MHz)
0.5
1.5
2.0
2.5
800
4.5
3617 G16
1.0
400
200
1000 1200
600 1400
3.0
3.5
4.0
R
T
= SV
IN
TEMPERATURE (°C)
–50
–1.2
FREQUENCY VARIATION (%)
–1.0
–0.6
–0.4
–0.2
0.8
0.2
–10
30
50 130
3617 G17
–0.8
0.4
0.6
0
–30 10
70
90
100
R
T
= SV
IN
typical perForMance characteristics
TEMPERATURE (°C)
–50
70
3617 G15
10
–10
110
50
–30
90
30 130
MAIN SWITCH
SYNCHRONOUS SWITCH
R
DS(0N)
(mΩ)
50
40
20
30
10
0
V
OUT
20mV/DIV
SW
2V/DIV
I
L
2A/DIV
2µs/DIV
3617 G10
V
OUT
= 1.25V
I
LOAD
= –3A
I
L
2A/DIV
V
OUT
500mV/DIV
PGOOD
5V/DIV
RUN
5V/DIV
500µs/DIV
3617 G11
V
OUT
= 1.25V
I
LOAD
= 0A