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

LTC3605A
Typical Performance Characteristics T_A = 25°C unless otherwise specified.
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)
3605A G10
Switch Leakage vs V_IN
350
300
250
200
150
100
50
0
0 2 4 6 8 10 12 14 16 18 20
V_IN (V)
3605A G11
Efficiency vs V_IN
96
94
V_OUT = 3.3V
92
I_LOAD = 1A
90
88
86
I_LOAD = 5A
84
82
80
0
5
10
15
20
25
V_IN (V)
3505A G12
Frequency vs V_ON Voltage
3.0
V_IN = 20V
R_T = 162k
2.5
2.0
1.5
1.0
0.5
0
0 2 4 6 8 10 12 14 16 18
V_ON (V)
3605A G13
Current Limit Foldback
120
100
80
60
40
20
0
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7
V_FB (V)
3605A G14
INTV_CC Load Regulation
101
100
T_A = 25°C
99
98
97
96
95
94
93
92
91
90
0 20 40 60 80 100 120 140
INTV_CC OUTPUT CURRENT (mA)
3605A G15
RUN Pin Threshold vs Temperature
1.30
1.25
DCM Operation
CLKOUT
2V/DIV
1.20
1.15
1.10
1.05
1.00
–40 –15
10 35 60 85
TEMPERATURE (°C)
110
3605A G16
V_SW
5V/DIV
I_L
2A/DIV
V_IN = 20V
V_OUT = 2.5V
MODE = 0V
I_OUT = 0A
L1 = 0.5µH
400ns/DIV
CCM Operation
CLKOUT
2V/DIV
V_SW
5V/DIV
3605A G17
I_L
2A/DIV
V_IN = 20V
V_OUT = 2.5V
MODE = 3.3V
I_OUT = 0A
L1 = 0.5µH
400ns/DIV
For more information www.linear.com/LTC3605A
3605A G18
3605afc
5