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LTC3255EMSE#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
LTC3255
4
3255f
For more information www.linear.com/LTC3255
TYPICAL PERFORMANCE CHARACTERISTICS
FB Pin Regulation Voltage
vs Input Voltage (I
OUT
= 1mA)
FB Pin Regulation Voltage
vs Input Voltage (I
OUT
= 50mA)
FB Pin Regulation Voltage
vs Temperature
Operating Mode Transition
Voltage vs Input Voltage
(I
OUT
= 5mA)
Operating Mode Transition
Voltage vs Input Voltage
(I
OUT
= 50mA)
Typical Minimum V
IN
– 2 • V
OUT
Compliance Required for Shunt
Mode Operation
Input Operating Current
vs Input Voltage
Input Operating Current
vs
Temperature
Input Shutdown Current
vs Input Voltage
T
A
= 25°C, unless otherwise noted.
V
IN
(V)
5
0
I
VIN
(µA)
5
15
20
25
50
35
15
25
30 50
3255 G01
10
40
45
30
10 20
35
40
45
SHUNT = GND
V
OUT
= 5V
T
A
= 25°C
TEMPERATURE (°C)
–60
0
I
VIN
(µA)
5
15
20
25
50
35
0
60
90 120
3255 G02
10
40
45
30
–30
30
150
V
IN
= 12V
V
OUT
= 5V
SHUNT = GND
V
IN
(V)
0
0
I
VIN
(µA)
5
10
15
20
30
10
20 30 40
3255 G03
50 60
150°C
25
EN = GND
125°C
–55°C
25°C
V
IN
(V)
5
V
FB
(V)
1.200
1.208
1.216
1.224
25
3255 G04
1.192
1.184
1.196
1.204
1.212
1.220
1.188
1.180
1.176
10
15
20
30 35 40 45 50
I
OUT
= 1mA
V
OUT
= 5V
SHUNT = GND
–60°C
25°C
105°C
150°C
V
IN
(V)
5
V
FB
(V)
1.200
1.208
1.216
1.224
25
3255 G05
1.192
1.184
1.196
1.204
1.212
1.220
1.188
1.180
1.176
10
15
20
30 35 40 45 50
I
OUT
= 50mA
V
OUT
= 5V
SHUNT = GND
–60°C
25°C
105°C
TEMPERATURE (°C)
–60
V
FB
(V)
1.192
1.216
1.220
1.224
0
60
90
3255 G06
1.184
1.208
1.200
1.188
1.212
1.176
1.180
1.204
1.196
–30
30
120
150
V
IN
= 12V
I
OUT
= 1mA
V
OUT
= 5V
V
OUT
(V)
2
V
IN
(V)
17
21
25
10
3255 G07
13
9
15
19
23
11
7
5
4
6
8
3 11
5
7
9
12
SHUNT = GND
2:1 MODE
1:1 MODE
TRANSITION
REGION
•
V
OUT
(V)
2
V
IN
(V)
17
21
25
10
3255 G08
13
9
15
19
23
11
7
5
4
6
8
3 11
5
7
9
12
SHUNT = GND
2:1 MODE
1:1 MODE
TRANSITION
REGION
•
TEMPERATURE (°C)
–60
2.5
V
IN
– 2 • V
OUT
(V)
2.6
2.8
2.9
3.0
3.5
3.2
0
60
90 120
3255 G09
2.7
3.3
3.4
3.1
–30
30
150
I
VIN
= 20mA
V
OUT
= 2.5V
V
OUT
= 3.3V
V
OUT
= 5V
V
OUT
= 12V
LTC3255
5
3255f
For more information www.linear.com/LTC3255
V
IN
(V)
4
4.90
V
OUT
(V)
4.92
4.96
4.98
5.00
5.10
5.04
6
8
9
3255 G14
4.94
5.06
5.08
5.02
5 7
10
11
1512 13 14
–60°C
25°C
125°C
SHUNT = GND
I
OUT
= 50mA
V
IN
(V)
10
11.75
V
OUT
(V)
11.80
11.90
11.95
12.00
12.25
12.10
14
18
20
3255 G15
11.85
12.15
12.20
12.05
12 16
22
24
3026 28
–60°C
25°C
125°C
SHUNT = GND
I
OUT
= 50mA
TYPICAL PERFORMANCE CHARACTERISTICS
Output Ripple
Load Transient
2.5V Output Voltage
vs Falling Input Voltage
5V Output Voltage
vs Falling Input Voltage
3.3V Output Voltage
vs Falling Input Voltage
12V Output Voltage
vs Falling Input Voltage
3.3V
OUT
Efficiency
vs Input Voltage at 50mA Load
5V
OUT
Efficiency
vs Input Voltage at 50mA Load
5V
OUT
Efficiency
vs Output Current
T
A
= 25°C, unless otherwise noted.
V
OUT
20mV/DIV
AC-COUPLED
40µs/DIV
3255 G10
V
IN
= 12V
V
OUT
= 3.3V
I
OUT
= 5mA
V
OUT
50mV/DIV
AC-COUPLED
50mA
5mA
I
OUT
40µs/DIV
3255 G11
V
IN
= 12V
V
OUT
= 3.3V
V
IN
(V)
2
2.45
V
OUT
(V)
2.46
2.48
2.49
2.50
2.55
2.52
4
6
7
3255 G12
2.47
2.53
2.54
2.51
3 5
8
9
10
–60°C
25°C
125°C
SHUNT = GND
I
OUT
= 50mA
V
IN
(V)
2
3.20
V
OUT
(V)
3.22
3.26
3.28
3.30
3.40
3.34
4
6
7
3255 G13
3.24
3.36
3.38
3.32
3 5
8
9
1210 11
–60°C
25°C
125°C
SHUNT = GND
I
OUT
= 50mA
INPUT VOLTAGE (V)
4
EFFICIENCY (%)
60
70
80
20
3255 G16
50
40
30
10
8
12
16
6
10
14
18
20
100
90
SHUNT = GND
IDEAL LDO
LTC3255
INPUT VOLTAGE (V)
5
10
EFFICIENCY (%)
20
40
50
60
17 19 21 23
100
3255 G17
30
7 9 11 13 15 25
70
80
90
SHUNT = GND
IDEAL LDO
LTC3255
OUTPUT CURRENT (mA)
0.1
40
30
EFFICIENCY (%)
POWER LOSS (mW)
80
90
1 10 100
3255 G18
70
60
50
20
0
100
120
EFFICIENCY
POWER LOSS
V
IN
= 12V
80
60
40
LTC3255
6
3255f
For more information www.linear.com/LTC3255
PIN FUNCTIONS
C
+
(Pin 1): Flying Capacitor Positive Connection. This pin
must not be driven externally.
V
OUT
(Pin 2): Charge Pump Output Voltage.
FB (Pin 3): Feedback pin for setting the regulated output
voltage, usually connected to V
OUT
through an external
resistor divider. In operation, the LTC3255 servos the FB
pin to 1.2V by transferring charge from V
IN
to V
OUT
.
SHUNT (Pin 4): Configuration pin that must
connect to
either the BIAS or GND pins to enable or defeat, respec-
tively, the LTC3255’s shunt regulator feature. Connect this
pin to either BIAS or GND on the circuit board layout. Do
not float this pin.
PGOOD (Pin 5): Power Good Open-Drain Logic Output.
This pin becomes high impedance when the feedback
voltage on the FB pin rises above 94% (typical) of the
regulation voltage
.
EN (Pin 6): Logic Input. A logic high on the EN pin will
enable the charge pump. A logic low shuts down the
LTC3255. Do not float this pin.
BIAS (Pin 7): Connect this pin to a 0.1µF bypass capaci-
tor to GND. A ceramic capacitor of at least 10V rating is
recommended.
GND (Pin 8 and Exposed Pad Pin 11): Ground Connection.
Exposed pad (Pin 11) must be soldered
to the circuit board
ground plane for proper thermal and electrical conduction.
C
–
(Pin 9): Flying Capacitor Negative Connection. This pin
must not be driven externally.
V
IN
(Pin 10): Input Supply Voltage. Bypass this pin to GND
with at least 1µF capacitance.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LTC3255EMSE#PBF

Mfr. #:
Buy LTC3255EMSE#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Controllers Wide VIN Range Fault Protected 50mA Step-Down Charge Pump
Lifecycle:
New from this manufacturer.
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