LTC3717 Datasheet, PDF (4/20 Pages) Linear Technology – Wide Operating Range, No RSENSE Step-Down Controller for DDR/QDR Memory Termination

LTC3717
TYPICAL PERFOR A CE CHARACTERISTICS
Efficiency vs Load Current
100
90
V_IN = 2.5V
V_OUT = 1.25V
80
70
60
50
40
30
20
10
0
0.01
FIGURE 1 CIRCUIT
0.1
1
10
LOAD CURRENT (A)
100
3717 G06
V_OUT/V_IN Tracking Ratio vs Input
Voltage
50.00
49.95 ^{LOAD = 0A}
49.90
49.85
49.80
LOAD = 1A
LOAD = 10A
49.75
49.70
FIGURE 1 CIRCUIT
49.65
1.5 1.7 1.9 2.1 2.3 2.5 2.7 2.9
INPUT VOLTAGE (V)
3717 G07
Frequency vs Input Voltage
450
400
LOAD = 10A
350
300
250
LOAD = 0A
200
150
100
50
V_OUT = 1.25V
FIGURE 1 CIRCUIT
0
1.5 1.7 1.9 2.1 2.3 2.5 2.7 2.9
INPUT VOLTAGE (V)
3717 G08
Load Regulation
0
–0.1
Start-Up Response
V_IN = 2.5V
V_OUT = 1.25V
V_OUT
1V/DIV
–0.2
I_L
–0.3
2A/DIV
–0.4
–0.5
FIGURE 1 CIRCUIT
–0.6
01234567
LOAD CURRENT (A)
8 9 10
3717 G09
V_IN = 2.5V
V_OUT = 1.25V
LOAD = 0.2Ω
4ms/DIV
FIGURE 1 CIRCUIT
Load-Step Transient
V_OUT
200mV/DIV
I_L
5A/DIV
3718 G09.eps
V_IN = 2.5V
20µs/DIV
V_OUT = 1.25V
LOAD = 500mA TO 10A STEP
FIGURE 1 CIRCUIT
3718 G10.eps
On-Time vs V_ON Voltage
1000
I_ION = 30µA
800
600
400
200
0
0
1
2
V_ON VOLTAGE (V)
3
3717 G11
4
On-Time vs Temperature
300
I_ION = 30µA
250
200
150
100
50
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3717 G12
On-Time vs I_ON Current
10k
1k
100
10
1
10
I_ON CURRENT (µA)
100
3717 G13
sn3717 3717fs