LTC3609 Datasheet, PDF (5/24 Pages) Linear Technology – 32V, 6A Monolithic Synchronous Step-Down DC/DC Converter

TYPICAL PERFORMANCE CHARACTERISTICS
LTC3609
Efficiency vs Load Current
100
90
80
70
V_OUT = 5V
V_OUT = 3.3V
60
V_OUT = 2.5V
50
V_OUT = 1.8V
V_OUT = 1.5V
40
V_OUT = 1.2V
V_OUT = 1V
30
20
10 VIN = 12V
FREQUENCY = 550kHz
0
0.01
0.1
1
LOAD CURRENT (A)
10
3609 G04
Efficiency vs Input Voltage
100
FCB = 5V
FIGURE 6 CIRCUIT
95
I_LOAD = 6A
90
I_LOAD = 1A
85
80
5
8 11 14 17 20 23 26 29 32
INPUT VOLTAGE (V)
3609 G05
Frequency vs Input Voltage
650
600
I_LOAD = 6A
550
500
I_LOAD = 1A
450
FCB = 0V
FIGURE 6 CIRCUIT
400
5 8 11 14 17 20 23 26
INPUT VOLTAGE (V)
29 32
3609 G06
Frequency vs Load Current
700
600
CONTINUOUS MODE
500
400
300
DISCONTINUOUS MODE
200
100
0
0
2
4
6
8
LOAD CURRENT (A)
3609 G07
Load Regulation
0.80
FIGURE 6 CIRCUIT
0.60
0.40
0.20
0
–0.20
–0.40
–0.60
–0.80
0
2
4
6
LOAD CURRENT (A)
8
3609 G08
I_TH Voltage vs Load Current
2.5
FIGURE 6 CIRCUIT
2.0
1.5
CONTINUOUS
MODE
1.0
0.5 _{DISCONTINUOUS}
MODE
0
0
2
4
6
LOAD CURRENT (A)
8
3609 G09
Load Current vs I_TH Voltage at
Different V_RNG
15
V_RNG = 1.2V
10
5
V_RNG = 0.7V
0
V_RNG = 1V
–5
On-Time vs I_ON Current
10000
V_VON = 0V
1000
100
–10
0
0.5 1.0 1.5
I_TH VOLTAGE (V)
2.0 2.5
3609 G10
10
1
10
I_ON CURRENT (μA)
100
3609 G11
On-Time vs V_ON Voltage
1000
I_ON = 30μA
800
600
400
200
0
0
1
2
V_ON VOLTAGE (V)
3
3609 G12
3609f
5