LTC1909-8 LINER [Linear Technology], LTC1909-8 Datasheet - Page 5

• Manufacturer Part Number: LTC1909-8
• Description: Wide Operating Range,No RSENSE TM Step-Down DC/DC Controller with SMBus Programming
• Manufacturer: LINER [Linear Technology]

50mV/DIV
TYPICAL PERFOR A CE CHARACTERISTICS
5A/DIV
100
2.5
2.0
1.0
1.5
0.5
95
85
80
90
V
0
OUT
0
I
0
Efficiency vs Input Voltage
L
I
FCB = 5V
FIGURE 1 CIRCUIT
TH
FIGURE 1 CIRCUIT
I
Transient Response
LOAD STEP 0A TO 10A
V
V
FCB = 0V
FIGURE 1 CIRCUIT
CONTINUOUS
LOAD
IN
OUT
Voltage vs Load Current
= 15V
5
= 2.5V
DISCONTINUOUS
MODE
= 10A
MODE
I
INPUT VOLTAGE (V)
LOAD CURRENT (A)
LOAD
10
5
= 1A
15
20 s
20
10
W
25
19098 G22
19098 G19
19098 G16
U
30
15
50mV/DIV
5A/DIV
–100
–200
300
280
260
240
220
200
300
200
100
V
OUT
0
I
L
5
0
Current Sense Threshold
vs I
Frequency vs Input Voltage
FCB = 0V
FIGURE 1 CIRCUIT
Transient Response
(Discontinuous Mode)
LOAD STEP 1A TO 10A
V
V
FCB = INTV
FIGURE 1 CIRCUIT
IN
OUT
TH
= 15V
0.5
= 2.5V
Voltage
10
CC
INPUT VOLTAGE (V)
1.0
I
TH
I
I
VOLTAGE (V)
OUT
OUT
15
1.5
20 s
= 10A
= 0A
V
RNG
2.0
= 2V
20
2.5
1.4V
1V
0.7V
0.5V
19098 G20
19098 G23
19098 G17
25
3.0
–0.1
–0.2
–0.3
–0.4
100
150
125
100
90
80
70
60
50
75
50
25
0.001
0
0
0
0
Efficiency vs Load Current
Load Regulation
Current Limit Foldback
DISCONTINUOUS
2
0.01
0.2
MODE
LOAD CURRENT (A)
LOAD CURRENT (A)
LTC1909-8
4
V
FB
0.1
0.4
(V)
FIGURE 1 CIRCUIT
V
V
EXTV
FIGURE 1 CIRCUIT
6
IN
OUT
CONTINUOUS
MODE
= 10V
CC
= 2.5V
0.6
1
= 5V
8
19098 G18
19098 G21
1778 G09
19098f
5
0.8
10
10