LTC3605A_15 Datasheet, PDF (4/22 Pages) Linear Technology – 20V, 5A Synchronous Step-Down Regulator

LTC3605A
Typical Performance Characteristics T_A = 25°C unless otherwise specified.
Efficiency vs Load Current
100
V_IN = 12V
90 f_SW = 1MHz
80
70
60
50
40
30
20
10
0
0.01
V_OUT = 3.3V
V_OUT = 2.5V
V_OUT = 1.8V
0.1
1
10
LOAD CURRENT (A)
3605A G01
Quiescent Current vs V_IN
2.0
1.5
1.0
0.5
0
0
4
8
12
16
20
INPUT VOLTAGE (V)
3605A G02
Shutdown Current vs V_IN
20
15
10
5
0
0
4
8
12
16
20
INPUT VOLTAGE (V)
3605A G03
I_INTVCC Current vs Frequency
25
MODE = 3.3V
NO LOAD
20
15
10
5
R_DS(ON) vs Temperature
120
100
TOP FET
80
60
BOTTOM FET
40
20
Load Regulation
1.5
1.0
INTERNAL ITH
COMPENSATION
(ITH = 3.3V)
0.5
V_IN = 12V
V_OUT = 1.2V
f = 1MHz
MODE = INTV_CC
0
–0.5 ^{EXTERNAL ITH}
COMPENSATION
–1.0
0
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5
FREQUENCY (MHz)
3605A G04
0
–45 –20
5 30 55 80 105 130
TEMPERATURE (°C)
3605A G05
–1.5
01
2 34 5
I_OUT (A)
67
3605A G06
Load Step
(External ITH Compensation)
V_OUT
100mV/DIV
AC-COUPLED
Load Step
(Internal ITH Compensation)
V_OUT
100mV/DIV
AC-COUPLED
Output Tracking
I_L
5A/DIV
I_L
5A/DIV
V_TRACK
V_FB
I_LOAD
5A/DIV
I_LOAD
5A/DIV
V_IN = 12V
V_OUT = 1.2V
I_LOAD = 0.4A
20µs/DIV
3605A G07
V_IN = 12V
V_OUT = 1.2V
I_LOAD = 0.4A
ITH = 3.3V
20µs/DIV
3605A G08
V_IN = 12V
V_OUT = 1.2V
500µs/DIV
3605A G09
3605afc
4
For more information www.linear.com/LTC3605A