Datasheet

LTC3708
7
3708fb
TYPICAL PERFORMANCE CHARACTERISTICS
On-Time vs EXTLPF Voltage On-Time vs INTLPF Voltage 2-Phase Operation
EXTLPF VOLTAGE (V)
1
0
t
ON1
(ns)
50
150
200
250
500
350
1.1
1.2
3708 G22
100
400
450
300
1.3
1.4
I
ON1
= 30μA
I
ON1
= 60μA
INTLPF VOLTAGE (V)
0.6
0
t
ON2
(ns)
50
150
200
250
500
350
1
1.4
1.6
3708 G23
100
400
450
300
0.8
1.2
1.8
2.0
I
ON2
= 30μA
I
ON2
= 60μA
I
IN
2A/DIV
V
SW1
10V/DIV
V
SW2
10V/DIV
V
IN
200mV/DIV
1μs/DIVV
IN
= 15V
V
OUT1
= 5V
V
OUT2
= 3.3V
I
OUT5
= I
OUT3
= 2A
3708 G024
Load Transient Response Without
External Synchronization
I
OUT1
10A/DIV
SW1
10V/DIV
10μs/DIV
3708 G25
V
OUT1
50mV/DIV
f
S
= 200kHz f
S
= 240kHz
Load Transient Response with
External Synchronization
I
OUT1
10A/DIV
SW1
10V/DIV
10μs/DIV
3708 G26
V
OUT1
50mV/DIV
f
S
= 220kHz f
S
= 220kHz
Discontinuous Mode Operation Power Good Mask
I
L
0.5A/DIV
V
OUT
20mV/DIV
2μs/DIVV
IN
= 15V
V
OUT
= 5V
V
FCB
= 5V
I
OUT
= 20mA
3708 G027
V
FB
0.2V/DIV
100μs/DIV
3708 G28
PGOOD
2V/DIV