LTC3714_15 Datasheet, PDF (5/28 Pages) Linear Technology – Intel Compatible, Wide Operating Range, Step-Down Controller with Internal Op Amp

Typical Performance Characteristics
LTC3714
Transient Response
V_OUT
50mV/DIV
I_L
5A/DIV
20µs/DIV
LOAD STEP 0A TO 10A
V_IN = 15V
V_OUT = 1.5V
FCB = 0V
FIGURE 1 CIRCUIT
Transient Response
(Discontinuous Mode)
V_OUT
50mV/DIV
I_L
5A/DIV
3714 G01
20µs/DIV
LOAD STEP 0A TO 10A
V_IN = 15V
V_OUT = 1.5V
FCB = INTV_CC
FIGURE 1 CIRCUIT
Start-Up
RUN/SS
2V/DIV
V_OUT
500mV/DIV
I_L
5A/DIV
3714 G02
V_IN = 15V
50ms/DIV
V_OUT = 1.25V
R_LOAD = 0.125Ω
3714 G03
Efficiency vs Load Current
95
90
V_IN = 8.5V
85
V_IN = 15V
80
V_IN = 24V
75
V_OUT = 1.35V
FREQUENCY = 300kHz
FIGURE 1 CIRCUIT
70
0 3 6 9 12 15 18 21
LOAD CURRENT (A)
3714 G04
Load Regulation
0
NO AVP
FIGURE 1 CIRCUIT
–0.1
–0.2
–0.3
–0.4
0
2
4
6
8
10
LOAD CURRENT (A)
3714 G07
Efficiency vs Input Voltage
100
90
I_OUT = 10A
80
I_OUT = 1A
70
I_OUT = 23A
60
0
5 10 15 20 25 30
INPUT VOLTAGE (V)
3714 G05
I_TH Voltage vs Load Current
2.5
FIGURE 1 CIRCUIT
2.0
1.5
CONTINUOUS
MODE
1.0
DISCONTINUOUS
0.5
MODE
0
0
5
10
LOAD CURRENT (A)
15
3714 G08
Frequency vs Input Voltage
300 _{FCB = 0V}
FIGURE 1 CIRCUIT
280
I_OUT = 10A
260
240
I_OUT = 0A
220
200
5
10
15
20
INPUT VOLTAGE (V)
25
3714 G06
Current Sense Threshold
vs I_TH Voltage
300
V_RNG = ^2V
200
1.4V
1V
100
0.7V
0.5V
0
–100
–200
0
0.5 1.0 1.5 2.0
I_TH VOLTAGE (V)
2.5 3.0
3714 G09
3714f
5