LTC1649 Linear Technology, LTC1649 Datasheet - Page 3

• Manufacturer Part Number: LTC1649
• Description: 3.3V Input High Power Step-Down Switching Regulator Controller
• Manufacturer: Linear Technology

TYPICAL PERFOR A CE CHARACTERISTICS
– 0.2
– 0.4
– 0.6
– 0.8
–1.0
14.0
13.5
13.0
12.5
12.0
11.5
11.0
10.5
100
0.4
0.2
95
90
85
80
70
75
0
– 40
– 40
I
Load Regulation
0
Maximum Duty Cycle
vs Temperature
MAX
V
CC
T
V
V
FIGURE 1
V
V
V
A
–20
OUT
CC
1
COMP
FB
CC
– 20
= 5V
= 25 C
Pin Current vs Temperature
= 5V
= 1.265V
= 5V
= 3.3V
2
= V
0
0
TEMPERATURE ( C)
3
LOAD CURRENT (A)
TEMPERATURE ( C)
CC
20
4
W
20
5
40
40
6
U
60
7
60
8
80
80
1649 G01
1649 G03
1649 G06
9
100
100
10
850
800
750
700
650
600
550
500
450
400
350
240
230
220
210
200
190
180
170
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
– 40
0
– 40
Error Amplifier Transconductance
vs Temperature
Oscillator Frequency
vs Temperature
0
Output Voltage vs Load Current
with Current Limit
V
T
V
FIGURE 1
CC
A
–20
– 20
CC
= 25 C
= 5V
= 5V
2
R
IMAX
0
0
TEMPERATURE ( C)
TEMPERATURE ( C)
LOAD CURRENT (A)
= 16k
4
20
20
6
40
40
R
IMAX
g
V
8
m
CC
60
60
=
= 33k
= 5V
I
COMP
10
80
80
V
FB
1649 G04
1649 G02
1649 G07
LTC1649
100
100
12
3