LTC3619B_15 Datasheet, PDF (5/20 Pages) Linear Technology – 400mA/800mA Synchronous Step-Down DC/DC with Average Input Current Limit

LTC3619B
Typical Performance Characteristics T_A = 25°C, V_IN = 5V, unless otherwise noted.
Efficiency vs Load Current
100
90
V_OUT = 3.3V
CHANNEL 1
80
70
60
50
40
30
20
10
0
0.0001
V_IN = 3.6V
V_IN = 4.2V
V_IN = 5V
0.001
0.01
0.1
OUTPUT CURRENT (A)
1
3619B G10
Efficiency vs Load Current
100
V_OUT = 3.3V
90 CHANNEL 2
80
70
60
50
40
30
20
10
0
0.0001
V_IN = 3.6V
V_IN = 4.2V
V_IN = 5V
0.001
0.01
0.1
OUTPUT CURRENT (A)
1
3619B G11
Efficiency vs Load Current
100
90
V_OUT = 1.2V
CHANNEL 1
80
70
60
50
40
30
20
10
0
0.0001
V_IN = 2.7V
V_IN = 3.6V
V_IN = 4.2V
V_IN = 5V
0.001
0.01
0.1
OUTPUT CURRENT (A)
1
3619B G12
Efficiency vs Load Current
100
90
V_OUT = 1.2V
CHANNEL 2
80
70
60
50
40
30
20
10
0
0.0001
V_IN = 2.7V
V_IN = 3.6V
V_IN = 4.2V
V_IN = 5V
0.001
0.01
0.1
OUTPUT CURRENT (A)
1
3619B G13
Load Regulation
3.0
CHANNEL 1
2.5
2.0
1.5
1.0
0.5
0
–0.5
–1.0
0
V_OUT = 1.8V
V_OUT = 2.5V
V_OUT = 3.3V
100
200
300
400
LOAD CURRENT (mA)
3619B G14
Load Regulation
3.0
CHANNEL 2
2.5
2.0
1.5
1.0
0.5
0
–0.5
–1.0
0
V_OUT = 1.8V
V_OUT = 2.5V
V_OUT = 3.3V
100 200 300 400 500 600 700 800
LOAD CURRENT (mA)
3619B G15
Line Regulation
0.6
V_OUT = 1.8V
I_LOAD = 100mA
0.4
Start-Up from Shutdown
RUN
2V/DIV
0.2
V_OUT
0
1V/DIV
–0.2
I_L
250mA/DIV
–0.4
–0.6
2.5 3.0 3.5 4.0 4.5 5.0 5.5
V_IN (V)
3619B G16
200µs/DIV
V_IN = 5V, V_OUT = 3.3V
R_LOAD = 7Ω
C_LOAD = 4.7µF
Start-Up from Shutdown
RUN
2V/DIV
V_OUT
2V/DIV
R_LIM
1V/DIV
3619B G17
I_IN
500mA/DIV _{CHANNEL 2}
2ms/DIV
V_IN = 5V, V_OUT = 3.4V
R_L = NO LOAD, C_L = 4.4mF
C_LIM = 2200pF, I_LIM = 500mA
3619B G18
3619bfb
5