LTC3541_15 Datasheet, PDF (4/20 Pages) Linear Technology – High Efficiency Buck VLDO Regulator

LTC3541
TYPICAL PERFOR A CE CHARACTERISTICS
Efficiency vs Input Voltage for
Buck (Burst)
100
95 ^{VOUT = 1.8V}
90
85
80
I_OUT = 100mA
75
I_OUT = 500mA
I_OUT = 30mA
70
65
60
55
50
2
3
4
5
6
INPUT VOLTAGE (V)
3541 G01
Efficiency vs Load Current for
Buck (Pulse Skip)
100
V_OUT = 1.8V
90
V_IN = 2.7V
80
V_IN = 3.6V
70
V_IN = 4.2V
60
50
40
30
20
10
0
0.1
1
10
100
1000
LOAD CURRENT (mA)
3541 G04
VLDO Dropout Voltage vs
Load Current
100
V_OUT = 1.5V
80
V_IN = 3V
V_IN = 3.6V
60
V_IN = 4.2V
40
20
0
0 50 100 150 200 250 300
LOAD CURRENT (mA)
3541 G07

Efficiency vs Input Voltage for
Buck (Pulse Skip)
100
95 ^{VOUT = 1.8V}
90
I_OUT = 500mA
85
80
75
70
I_OUT = 100mA
65
I_OUT = 30mA
60
55
50
2
3
4
5
6
INPUT VOLTAGE (V)
3541 G02
Efficiency vs Load Current for
Buck (Burst)
100
90 _{VIN = 2.7V}
80
70
V_IN = 4.2V
V_IN = 3.6V
60
50
40
30
20
10
0 ^{VOUT = 1.8V}
0.1
1
10
100
LOAD CURRENT (mA)
1000
3541 G03
Efficiency vs Load Current for
Buck (Burst)
100
90
V_IN = 2.7V
80
V_IN = 3.6V
V_IN = 4.2V
70
60
50
40
30
20
10
0 ^{VOUT = 2.5V}
0.1
1
10
100
LOAD cURRENT (mA)
1000
3541 G05
Efficiency vs Load Current for
Buck (Pulse Skip)
100
V_OUT = 2.5V
90
80
V_IN = 2.7V
70
V_IN = 3.6V
V_IN = 4.2V
60
50
40
30
20
10
0
0.1
1
10
100
1000
LOAD CURRENT (mA)
3541 G06
Buck (Burst) Plus VLDO Bias
Current vs VLDO Load Current
250
V_IN = 3.6V
I_LOAD(BUCK) = 0
200 ^{IBIAS = IVIN + ILVIN – ILOAD}
150
100
Output (Auto Start-Up Sequence,
Buck in Pulse Skip) vs Time
V_OUT
2V/DIV
LV_OUT
2V/DIV
V_IN
2V/DIV
50
0
0.1
1
10
100
LOAD CURRENT (mA)
1000
3541 G08
I_VOUT = 300mA 2ms/DIV
I_LVOUT = 200mA
3541 G09
3541fa