LTC1775 LINER [Linear Technology], LTC1775 Datasheet - Page 5

• Manufacturer Part Number: LTC1775
• Description: High Power No RSENSE TM Current Mode Synchronous Step-Down Switching Regulator
• Manufacturer: LINER [Linear Technology]

TYPICAL PERFOR A CE CHARACTERISTICS
100mV
5A/DIV
V
– 0.5
– 1.0
– 1.5
– 2.0
/DIV
OUT
350
300
250
200
150
100
50
I
L
0
0
–40
0
Maximum Current Sense Voltage
vs Duty Cycle
FCB Pin Current vs Temperature
V
V
I
FIGURE 1 CIRCUIT
Transient Response
LOAD
IN
OUT
= 20V
–15
= 5V
= 2A TO 8A
0.2
10
TEMPERATURE ( C)
DUTY CYCLE
0.4
100 s/DIV
35
60
0.6
85
W
0.8
110
1775 • G10
1775 • G13
1530 G18
U
1.0
135
100mV
5A/DIV
V
/DIV
OUT
320
310
300
290
280
–1
–2
–3
–4
–5
I
L
0
–40
–40
V
V
I
FIGURE 1 CIRCUIT
Maximum Current Sense Voltage
vs Temperature
RUN/SS Pin Current vs
Temperature
Transient Response
(Burst Mode Operation)
LOAD
IN
OUT
= 20V
–15
–15
= 5V
= 100mA TO 2A
10
10
TEMPERATURE ( C)
TEMPERATURE ( C)
200 s/DIV
35
35
60
60
85
85
110
110
1775 • G11
1775 • G14
1530 G17
135
135
RUN/SS
100mV
2A/DIV
5V/DIV
5V/DIV
5A/DIV
50mV
V
V
/DIV
/DIV
300
250
200
150
100
OUT
OUT
I
50
TH
I
I
0
L
L
–40
Oscillator Frequency
vs Temperature
Soft Start
Burst Mode Operation
V
V
I
FIGURE 1 CIRCUIT
V
V
R
FIGURE 1 CIRCUIT
LOAD
IN
OUT
IN
OUT
LOAD
= 20V
= 20V
–15
= 5V
= 5V
= 100mA
= 0.5
10
TEMPERATURE ( C)
SYNC = 1.5V
SYNC = 0V
35
20ms/DIV
20 s/DIV
LTC1775
60
85
110
1775 • G12
1530 G15
1530 G16
5
135