LTC3605_15 Datasheet, PDF (4/22 Pages) Linear Technology – 15V, 5A Synchronous Step-Down Regulator

LTC3605
Typical Performance Characteristics T_A = 25°C unless otherwise specified.
Quiescent Current vs V_IN
2.18
MODE = 0V
2.16 NO LOAD
2.14
2.12
2.10
2.08
2.06
2.04
2.02
2.00
0
3
6
9
12
V_IN (V)
15
3605 G01
Shutdown Current vs V_IN
14
13
12
11
10
9
8
7
6
0
3
6
9
12
V_IN (V)
15
3605 G02
I_INTVCC Current vs Frequency
25
MODE = 3.3V
NO LOAD
20
15
10
5
0
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5
FREQUENCY (MHz)
3605 G03
R_DS(ON) vs Temperature
120
100
TOP FET
80
60
BOTTOM FET
40
20
0
–45 –20
5 30 55 80 105 130
TEMPERATURE (°C)
3605 G04
Load Regulation
1.5
1.0
INTERNAL ITH
COMPENSATION
(ITH = 3.3V)
0.5
Load Step
(External ITH Compensation)
V_IN = 12V
V_OUT = 1.2V
f = 1MHz
MODE = INTV_CC
V_OUT
50mV/DIV
AC-COUPLED
I_OUT
5A/DIV
0
–0.5 ^{EXTERNAL ITH}
COMPENSATION
–1.0
–1.5
01
2 34 5
I_OUT (A)
67
3605 G05
I_L
5A/DIV
V_IN = 12V
20µs/DIV
V_OUT = 1.2V
I_OUT = 0A TO 5A
3605 G06
Load Step
(Internal ITH Compensation)
V_OUT
50mV/DIV
AC-COUPLED
I_OUT
5A/DIV
V_IN = 12V
V_OUT = 3.3V
ITH = 3.3V
I_OUT = 0A TO 5A
20µs/DIV
3605 G07
Output Tracking
V_TRACK
V_FB
V_IN = 12V
V_OUT = 1.2V
500µs/DIV
3605 G08
Switching Frequency vs R_T
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
0 50 100 150 200 250 300 350 400 450 500
R_T (kΩ)
3605 G09
3605fd
4
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