LTC3770_15 Datasheet, PDF (6/24 Pages) Linear Technology – Fast No RSENSE Step-Down Synchronous Controller with Margining, Tracking and PLL

LTC3770
TYPICAL PERFORMANCE CHARACTERISTICS
Track Up
Track Down
FIGURE 12 CIRCUIT
TRACK/SS
AND V_FB
500mV/DIV
V_OUT
2V/DIV
TRACK/SS
V_FB
V_OUT
FIGURE 12 CIRCUIT
TRACK/SS
AND V_FB
500mV/DIV
TRACK/SS
V_FB
V_OUT
2V/DIV
V_OUT
250ms/DIV
3770 G13
250ms/DIV
Transient Response
FIGURE 12 CIRCUIT
V_OUT
100mV/DIV
3770 G14
I_L
5A/DIV
STEP
0A TO 10A
20μs/DIV
3770 G15
Efficiency vs Load Current
100 _{FIGURE 12 CIRCUIT}
95
90
DISCONTINUOUS
MODE
85
80
75
CONTINUOUS
MODE
70
65
60
55
50
0.01
0.1
1
10
LOAD CURRENT (A)
3770 G16
I_TH Voltage vs Load Current
2.5 _{FIGURE 12 CIRCUIT}
2.0
1.5
CONTINUOUS
MODE
1.0
0.5 _{DISCONTINUOUS}
MODE
0
0
2
4
6
8
LOAD CURRENT (A)
10 12
3770 G17
Frequency vs Input Voltage
480
460
I_OUT = 10A
440
420
400
380
I_OUT = 0A
360
340
320 _{FCB = 0V}
FIGURE 12 CIRCUIT
300
0
5 10 15 20
INPUT VOLTAGE (V)
25 30
3770 G18
6
Efficiency vs Input Voltage
100
FCB = 5V
FIGURE 12 CIRCUIT
95
90
I_LOAD = 10A
85
I_LOAD = 1A
80
75
70
0
5 10 15 20 25 30
INPUT VOLTAGE (V)
3770 G19
Frequency vs Load Current
500
FIGURE 12 CIRCUIT
450
400
350
300
CONTINUOUS
MODE
250
200
150
DISCONTINUOUS
MODE
100
50
0
0
2
4
6
8 10 12
LOAD CURRENT (A)
3770 G20
3770fc