LTC3255_15 Datasheet, PDF (4/16 Pages) Linear Technology – Wide VIN Range Fault Protected 50mA Step-Down Charge Pump

LTC3255
TYPICAL PERFORMANCE CHARACTERISTICS T_A = 25°C, unless otherwise noted.
Input Operating Current
vs Input Voltage
50
SHUNT = GND
45 _{VOUT = 5V}
40 ^{TA = 25°C}
35
30
25
20
15
10
5
0
5 10 15 20 25 30 35 40 45 50
V_IN (V)
3255 G01
FB Pin Regulation Voltage
vs Input Voltage (I_OUT = 1mA)
1.224
1.220
1.216
I_OUT = 1mA
V_OUT = 5V
SHUNT = GND
1.212
1.208
1.204
1.200
1.196
1.192
1.188
1.184
1.180
1.176
5
–60°C
25°C
105°C
150°C
10 15 20 25 30 35 40 45 50
V_IN (V)
3255 G04
Operating Mode Transition
Voltage vs Input Voltage
(I_OUT = 5mA)
25
SHUNT = GND
23
21
19
17
2:1 MODE
15
1:1 MODE
13
•
11
TRANSITION
REGION
9
7
5
2 3 4 5 6 7 8 9 10 11 12
V_OUT (V)
3255 G07
4
Input Operating Current
vs Temperature
50
45
V_IN = 12V
V_OUT = 5V
40 ^{SHUNT = GND}
35
30
25
20
15
10
5
0
–60 –30
0 30 60 90
TEMPERATURE (°C)
120 150
3255 G02
FB Pin Regulation Voltage
vs Input Voltage (I_OUT = 50mA)
1.224
1.220
1.216
I_OUT = 50mA
V_OUT = 5V
SHUNT = GND
1.212
1.208
1.204
1.200
1.196
1.192
1.188
1.184
1.180
1.176
5
–60°C
25°C
105°C
10 15 20 25 30 35 40 45 50
V_IN (V)
3255 G05
Operating Mode Transition
Voltage vs Input Voltage
(I_OUT = 50mA)
25
SHUNT = GND
23
21
19
2:1 MODE
17
15
1:1 MODE
13
•
11
TRANSITION
9
REGION
7
5
2 3 4 5 6 7 8 9 10 11 12
V_OUT (V)
3255 G08
Input Shutdown Current
vs Input Voltage
30
EN = GND
25
20
150°C
15
10
5
0
0
125°C
25°C
–55°C
10 20 30 40
V_IN (V)
50 60
3255 G03
FB Pin Regulation Voltage
vs Temperature
1.224
1.220
1.216
1.212
V_IN = 12V
I_OUT = 1mA
V_OUT = 5V
1.208
1.204
1.200
1.196
1.192
1.188
1.184
1.180
1.176
–60 –30
0 30 60 90 120 150
TEMPERATURE (°C)
3255 G06
Typical Minimum V_IN – 2 • V_OUT
Compliance Required for Shunt
Mode Operation
3.5
3.4 ^{IVIN = 20mA}
3.3
3.2
3.1
3.0
2.9
2.8
2.7
2.6
2.5
–60 –30
V_OUT = 2.5V
V_OUT = 3.3V
V_OUT = 5V
V_OUT = 12V
0 30 60 90 120 150
TEMPERATURE (°C)
3255 G09
3255f
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