ltc3717-1 Linear Technology Corporation, ltc3717-1 Datasheet - Page 4

• Manufacturer Part Number: ltc3717-1
• Description: Wide Operating Range, No Rsense Step-down Controller For Ddr/qdr Memory Termination
• Manufacturer: Linear Technology Corporation

LTC3717-1
4
TYPICAL PERFOR A CE CHARACTERISTICS
–0.1
–0.2
–0.3
–0.4
–0.5
–0.6
100
90
80
70
60
50
40
30
20
10
0
0
0.01
Efficiency vs Load Current
Load Regulation
0
V
V
FIGURE 1 CIRCUIT
IN
OUT
1
= 2.5V
200mV/DIV
= 1.25V
2
0.1
5A/DIV
LOAD CURRENT (A)
V
3
LOAD CURRENT (A)
OUT
I
L
4
Load-Step Transient
V
V
LOAD = 500mA TO 10A STEP
FIGURE 1 CIRCUIT
1
5
IN
OUT
FIGURE 1 CIRCUIT
= 2.5V
= 1.25V
6
7
V
V
W
10
IN
OUT
= 2.5V
8
= 1.25V
37171 G01
37171 G04
9
20 s/DIV
U
100
10
50.00
49.95
49.90
49.85
49.80
49.75
49.70
49.65
1000
800
600
400
200
0
1.5
On-Time vs V
0
37171 G05
V
vs Input Voltage
I
ION
OUT
LOAD = 0A
1.7
= 30 A
/V
IN
1.9
Tracking Ratio
INPUT VOLTAGE (V)
LOAD = 10A
V
1
ON
2.1
ON
VOLTAGE (V)
Voltage
2.3
FIGURE 1 CIRCUIT
LOAD = 1A
2.5
2
1V/DIV
2A/DIV
V
OUT
2.7
I
L
37171 G07
37171 G02
2.9
Start-Up Response
V
V
LOAD = 0.2
FIGURE 1 CIRCUIT
IN
OUT
3
= 2.5V
= 1.25V
450
400
350
300
250
200
150
100
300
250
150
100
200
50
50
0
0
–50
1.5
4ms/DIV
Frequency vs Input Voltage
On-Time vs Temperature
I
ION
V
FIGURE 1 CIRCUIT
–25
OUT
1.7
= 30 A
= 1.25V
1.9
0
INPUT VOLTAGE (V)
TEMPERATURE ( C)
LOAD = 10A
LOAD = 0A
2.1
25
37171 G06
2.3
50
2.5
75
sn37171 37171fs
2.7
100
37171 G08
37171 G03
2.9
125