LTC3606B Datasheet, PDF (4/20 Pages) Linear Technology – 800mA Synchronous Step-Down DC/DC with Average Input Current Limit

LTC3606B
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
3606B G01
Supply Current vs Temperature
550
RUN = V_IN
500 ^{ILOAD = 0A}
V_IN = 5.5V
450
400
V_IN = 2.7V
350
300
250
200
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3606B 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}
I_OUT = 10mA
I_OUT = 1mA
I_OUT = 0.1mA
0
3.5
4
4.5
5
5.5
V_IN (V)
3606B 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
3606B 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
3606B G05
Switch Leakage vs Input Voltage
1000
800
600
MAIN SWITCH
400
200 ^{SYNCHRONOUS SWITCH}
0
2.5 3 3.5 4 4.5 5 5.5
V_IN (V)
3606B G06
Switch On-Resistance
vs Input Voltage
600
500
Switch On-Resistance
vs Temperature
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
400
0.2
0.4
300
200
2.5
MAIN SWITCH
SYNCHRONOUS SWITCH
3 3.5 4 4.5 5 5.5
V_IN (V)
3606B G07
0.1
0.3
0
SYNCHRONOUS SWITCH
–0.1
–50 –25 0 25 50 75
TEMPERATURE (°C)
0.2
0.1
100 125
3606B G09
Efficiency vs Load Current
100
V_OUT = 3.3V
90
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
3606B G11
3606bfa
4