LTC3565_15 Datasheet, PDF (5/22 Pages) Linear Technology – 1.25A, 4MHz, Synchronous Step-Down DC/DC Converter

LTC3565
TYPICAL PERFORMANCE CHARACTERISTICS T_J = 25°C, V_IN = 3.6V, f_O = 1MHz, unless
otherwise noted.
Frequency Variation vs Input
Voltage
6
R_DS(ON) vs Input Voltage
0.25
R_DS(ON) vs Temperature
0.30
4
2
0
–2
–4
–6
–8
2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
3565 G10
Dynamic Supply Current vs Input
Voltage
100
0.20
0.15
0.10
0.05
MAIN SWITCH
SYNCHRONOUS SWITCH
0.0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
3565 G11
Dynamic Supply Current vs
Temperature
100
0.25
0.20
0.15
0.10
0.05
0.0
–50 –25
MAIN SWITCH
SYNCHRONOUS SWITCH
0 25 50 75
TEMPERATURE (°C)
100 125
3565 G12
Switch Leakage vs Input Voltage
2500
10
FORCED CONTINUOUS
1
PULSE SKIP
0.1 ^{Burst Mode}
OPERATION
0.01
0.001
2.5
V_OUT = 1.8V
I_LOAD = 0A
3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
3565 G13
10
FORCED CONTINUOUS
1
PULSE SKIP
0.1 ^{Burst Mode}
OPERATION
0.01
0.001
–50 –25
V_OUT = 1.8V
I_LOAD = 0A
0 25 50 75
TEMPERATURE (°C)
100 125
3565 G14
2000
1500
MAIN SWITCH
1000
SYNCHRONOUS SWITCH
500
0
0
1
2
3
4
5
6
INPUT VOLTAGE (V)
3565 G15
Switch Leakage vs Temperature
600
500
Burst Mode Operation
SW
2V/DIV
400
V_OUT
50mV/DIV
300
AC COUPLED
200
100
0
–50
MAIN SWITCH
SYNCHRONOUS SWITCH
–25 0 25 50 75 100 125
TEMPERATURE (°C)
3565 G16
I_L
200mA/DIV
V_IN = 3.6V
V_OUT = 1.8V
I_LOAD = 50mA
4µs/DIV
Pulse Skipping Mode
SW
2V/DIV
V_OUT
50mV/DIV
AC COUPLED
I_L
200mA/DIV
3565 G17
V_IN = 3.6V
V_OUT = 1.8V
I_LOAD = 5mA
4µs/DIV
3565 G18
For more information www.linear.com/LTC3565
3565fc
5