LTC3560_15 Datasheet, PDF (4/16 Pages) Linear Technology – 2.25MHz, 800mA Synchronous Step-Down Regulator in ThinSOT

LTC3560
TYPICAL PERFORMANCE CHARACTERISTICS
(From Figure 1a Except for the Resistive Divider Resistor Values)
Efficiency vs Output Current
100
V_OUT = 1.3V
90
80
70
60
50
40
30
20
10
0
0.1
V_IN = 2.7V
V_IN = 3.6V
V_IN = 4.2V
1
10
100
OUTPUT CURRENT (mA)
1000
3560 G04
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
3560 G07
Efficiency vs Output Current
100
Burst Mode OPERATION
90
80
70
60
50
PULSE SKIP MODE
40
30
20
10
V_IN = 4.2V
0 ^{VOUT = 1.8V}
V_IN = 3.6V
0.1
1
10
100
1000
OUTPUT CURRENT (mA)
3560 G05
Oscillator Frequency
vs Supply Voltage
2.4
2.3
2.2
2.1
2.0
1.9
1.8
2 2.5 3 3.5 4 4.5 5 5.5 6
INPUT VOLTAGE (V)
3560 G08
Reference Voltage
vs Temperature
0.615
V_IN = 3.6V
0.610
0.605
0.600
0.595
0.590
0.585
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3560 G06
Output Voltage vs Load Current
1.84
V_IN = 3.6V
1.83
1.82
1.81
Burst Mode OPERATION
1.80
PULSE SKIP MODE
1.79
1.78
0
200 400 600 800 1000 1200
LOAD CURRENT (mA)
3560 G09
R_DS(ON) vs Input Voltage
0.40
0.35
0.30
MAIN SWITCH
0.25
SYNCHRONOUS
SWITCH
0.20
0.15
0.10
01
2 34 5
INPUT VOLTAGE (V)
67
3560 G10
4
R_DS(ON) vs Temperature
0.40
0.35
V_IN = 2.7V
V_IN = 3.6V
0.30
0.25
V_IN = 4.2V
0.20
0.15
0.10
0.05
0
–50 –25
SYNCHRONOUS SWITCH
MAIN SWITCH
0 25 50 75 100 125
TEMPERATURE (°C)
3560 G11
Dynamic Supply Current
300
V_OUT = 1.2V
I_LOAD = 0A
250
200
PULSE SKIPPING MODE
150
100
50
Burst Mode OPERATION
0
2 2.5 3 3.5 4 4.5 5 5.5 6
INPUT VOLTAGE (V)
3560 G12
3560fb