LTC3541_15 Datasheet, PDF (5/20 Pages) Linear Technology – High Efficiency Buck VLDO Regulator

TYPICAL PERFOR A CE CHARACTERISTICS
LTC3541
Oscillator Frequency
vs Temperature
2.50
V_IN = 3.6V
2.45
2.40
2.35
2.30
2.25
2.20
2.15
2.10
2.05
2.00
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3541 G10
Oscillator Frequency
vs Supply Voltage
2.5
V_IN = 3.6V
2.4
2.3
2.2
2.1
2.0
3
4
5
SUPPLY VOLTAGE (V)
6
3541 G11
VLDO/Linear Regulator Reference
vs Temperature
0.410
V_IN = 3.6V
0.408
0.406
0.404
0.402
0.400
0.398
0.396
0.394
0.392
0.390
–50 –25
0 25 50 75 100 125
TEMPERATURE (°C)
5341 G12
Buck Reference vs Temperature
0.820
0.816 ^{VIN = 3.6V}
0.812
0.808
0.804
0.800
0.796
0.792
0.788
0.784
0.780
–50 –25
0 25 50 75 100 125
TEMPERATURE (°C)
5341 G13
Buck (Pulse Skip) Load Step from
1mA to 500mA
R_DS(ON) vs Temperature
0.700
Buck (Burst) and VLDO Output
0.600
0.500
0.400
SYNCH SWITCH
0.300
LV_OUT
10mV/DIV
AC COUPLED
V_OUT
10mV/DIV
AC COUPLED
0.200
0.100 ^{MAIN SWITCH}
0
–50 –25 0 25 50
V_IN = 2.5V
V_IN = 3.6V
V_IN = 5.5V
75 100 125
TEMPERATURE (°C)
3541 G14
Buck (Burst) Load Step from
1mA to 500mA
V_IN = 3.6V
2µs/DIV
LV_OUT = 1.5V
V_OUT = 1.8V
I_LOAD = 50mA
Burst Mode OPERATION
VLDO Load Step from
1mA to 500mA
3541 G15
V_OUT
100mV/DIV
AC COUPLED
I_L
500mA/DIV
I_LOAD
500mA/DIV
V_IN = 3.6V
40µs/DIV
V_OUT = 1.8V
I_LOAD = 1mA TO 500mA
V_OUT
100mV/DIV
AC COUPLED
I_L
500mA/DIV
I_LOAD
500mA/DIV
3541 G16
V_IN = 3.6V
40µs/DIV
V_OUT = 1.8V
I_LOAD = 1mA TO 500mA
LV_OUT
20mV/DIV
AC COUPLED
I_LOAD
250mA/DIV
3541 G17
V_IN = 3.6V
400µs/DIV
LV_OUT = 1.5V
I_LOAD = 1mA TO 300mA
3541 G18
3541fa