LTC3619B_15 Datasheet, PDF (4/20 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.
Pulse-Skipping Mode Operation
SW
2V/DIV
V_OUT
50mV/DIV
AC-
COUPLED
I_L
100mA/DIV
V_IN = 5V
V_OUT = 3.3V
I_LOAD = 5mA
5µs/DIV
3619B G01
Supply Current vs Temperature
900
RUN1 = RUN2 = V_IN
800 ^{ILOAD = 0A}
V_IN = 5.5V
700
600
V_IN = 2.7V
500
400
300
200
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3619B G02
Efficiency vs Input Voltage
100
90
80
70
60
50
40
I_OUT = 100mA
30
I_OUT = 400mA
I_OUT = 800mA
20
10 ^VOUT ^{= 3.3V}
CHANNEL 2
0
3.5
4
4.5
V_IN (V)
I_OUT = 10mA
I_OUT = 1mA
I_OUT = 0.1mA
5
5.5
3619B G03
Regulated Voltage vs Temperature
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3619B G04
Oscillator Frequency
vs Temperature
2.5
2.4
2.3
2.2
2.1
2.0
1.9
1.8
–50 –25
V_IN = 2.7V
V_IN = 3.6V
V_IN = 4.2V
V_IN = 5V
0 25 50 75
TEMPERATURE (°C)
100 125
3619B G05
Switch Leakage vs Input Voltage
1000
CHANNEL 1
CHANNEL 2
800
600
MAIN SWITCH
400 _{SYNCHRONOUS SWITCH}
200
0
2.5 3 3.5 4 4.5 5 5.5
V_IN (V)
3619B G06
Switch On-Resistance
vs Input Voltage
650
CHANNEL 1
CHANNEL 2
550
MAIN SWITCH
450
350
SYNCHRONOUS SWITCH
250
2.5 3 3.5 4 4.5
V_IN (V)
5 5.5
3619B G07
Switch On-Resistance
vs Temperature, Channel 1
0.7
V_IN = 2.7V
V_IN = 3.6V
0.6
V_IN = 5V
MAIN SWITCH
0.5
0.4
0.3
SYNCHRONOUS SWITCH
0.2
–50 –25 0 25 50 75
TEMPERATURE (°C)
100 125
3619B G08
Switch On-Resistance
vs Temperature, Channel 2
0.5
0.7
V_IN = 2.7V
V_IN = 3.6V ^{MAIN SWITCH}
0.4
V_IN = 5V
0.6
0.3
0.5
0.2
0.4
0.1
0.3
0
SYNCHRONOUS SWITCH
–0.1
–50 –25 0 25 50 75
TEMPERATURE (°C)
0.2
0.1
100 125
3619B G09
3619bfb
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