LTC3255_15 Datasheet, PDF (5/16 Pages) Linear Technology – Wide VIN Range Fault Protected 50mA Step-Down Charge Pump

LTC3255
TYPICAL PERFORMANCE CHARACTERISTICS T_A = 25°C, unless otherwise noted.
3.3V_OUT Efficiency
vs Input Voltage at 50mA Load
100
SHUNT = GND
90
80
70
LTC3255
60
50
40
IDEAL LDO
30
20
10
4 6 8 10 12 14 16 18 20
INPUT VOLTAGE (V)
3255 G16
5V_OUT Efficiency
vs Input Voltage at 50mA Load
100
SHUNT = GND
90
80
70
LTC3255
60
50
40
IDEAL LDO
30
20
10
5 7 9 11 13 15 17 19 21 23 25
INPUT VOLTAGE (V)
3255 G17
5V_OUT Efficiency
vs Output Current
90
120
V_IN = 12V
EFFICIENCY
80
100
70
80
60
60
50
40
40
30
0.1
POWER LOSS
1
10
OUTPUT CURRENT (mA)
20
0
100
3255 G18
Output Ripple
V_OUT
20mV/DIV
AC-COUPLED
V_IN = 12V
V_OUT = 3.3V
I_OUT = 5mA
40µs/DIV
Load Transient
V_OUT
50mV/DIV
AC-COUPLED
3255 G10
50mA
I_{OUT 5mA}
V_IN = 12V
V_OUT = 3.3V
40µs/DIV
3255 G11
2.5V Output Voltage
vs Falling Input Voltage
2.55
SHUNT = GND
2.54 _{IOUT = 50mA}
2.53
2.52
2.51
2.50
2.49
2.48
2.47
2.46
2.45
23 4 56 78
V_IN (V)
–60°C
25°C
125°C
9 10
3255 G12
3.3V Output Voltage
vs Falling Input Voltage
3.40
SHUNT = GND
3.38 _{IOUT = 50mA}
3.36
3.34
3.32
3.30
3.28
3.26
3.24
–60°C
3.22
25°C
125°C
3.20
2 3 4 5 6 7 8 9 10 11 12
V_IN (V)
3255 G13
5V Output Voltage
vs Falling Input Voltage
5.10
SHUNT = GND
5.08 _{IOUT = 50mA}
5.06
5.04
5.02
5.00
4.98
4.96
4.94
–60°C
4.92
25°C
125°C
4.90
4 5 6 7 8 9 10 11 12 13 14 15
V_IN (V)
3255 G14
12V Output Voltage
vs Falling Input Voltage
12.25
12.20
12.15
SHUNT = GND
I_OUT = 50mA
12.10
12.05
12.00
11.95
11.90
11.85
–60°C
11.80
25°C
125°C
11.75
10 12 14 16 18 20 22 24 26 28 30
V_IN (V)
3255 G15
3255f
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