LTC3409A_15 Datasheet, PDF (4/16 Pages) Linear Technology – 600mA Low VIN Buck Regulator in 3mm 3mm DFN

LTC3409A
TYPICAL PERFORMANCE CHARACTERISTICS
(T_A = 25°C, from Typical Application on the front page except for the resistive divider resistor values)
Pulse-Skipping Efficiency/Power
Lost vs Load Current, V_OUT = 1.8V
100
1
EFFICIENCY
90
V_IN = 3.6V
80
70
V_IN = 4.2V
0.1
60
V_IN = 2.5V
50
40
30
V_IN = 4.2V _0.01
20
V_IN = 2.5V ^VIN ^{= 3.6V}
10
POWER LOST
0
0.001
0
1
10
100
1000
LOAD CURRENT (mA)
3409A G01
Efficiency vs Input Voltage,
V_OUT = 1.2V, Burst Mode Operation
100
90
80
70
60
50
40
30
20
10
0
1.6
I_OUT = 0.1mA
I_OUT = 1mA
I_OUT = 10mA
I_OUT = 100mA
I_OUT = 600mA
2.6
3.6
4.6
5.5
INPUT VOLTAGE (V_IN)
3409A G02
Efficiency vs Input Voltage
V_OUT = 1.2V, Pulse-Skipping
100
90 ^{IOUT = 100mA}
80
I_OUT = 600mA
70
60
50
I_OUT = 10mA
40
30
I_OUT = 1mA
20
10
I_OUT = 0.1mA
0
1.5
2.5
3.5
4.5
5.5
INPUT VOLTAGE (V_IN)
3409A G03
Efficiency vs Load Current,
V_OUT = 2.5V
100
90
2.7V_IN
80
70
4.2V_IN
60
3.6V_IN
4.2V_IN
50
40
30
2.7V_IN
20
3.6V_IN
10
0
0.1
BURST
PULSE-SKIPPING
1
10
100
LOAD CURRENT (mA)
1000
3409A G04
Efficiency vs Load Current,
V_OUT = 1.2V
100
90 _2.5VIN
80
1.6V_IN
70
60
3.1V_IN
3.1V_IN
50
2.5V_IN
40
1.6V_IN
30
20
10
0
0.1
BURST
PULSE-SKIPPING
1
10
100
LOAD CURRENT (mA)
1000
3409A G05
Reference Voltage
vs Temperature
0.616
0.615
0.614
0.613
0.612
0.611
0.610
0.609
0.608
–50 –30 –10 10 30 50 70 90 110 125
TEMPERATURE (°C)
3409A G06
Oscillator Frequency
vs Temperature
2.7
2.6
2.5
2.4
2.3
2.2
2.1
2.0
1.9
1.8
1.7
1.6
1.5
1.4
1.3
1.2
–50
V_IN = 2.7V
V_IN = 1.6V
V_IN = 4.2V _{OSC 2.6MHz}
V_IN = 4.2V
OSC 1.7MHz
V_IN = 1.6V ^{VIN = 2.7V}
–25 0 25 50 75 100 125
TEMPERATURE (°C)
3409A G07
Oscillator Frequency Shift
vs Input Voltage
6
4
f_LOW
2
1.7MHz
0
f_HIGH
–2
2.6MHz
–4
–6
–8
–10
1.5
2.5
3.5
4.5
INPUT VOLTAGE (V)
5.5
3409A G08
3409af
4