LTC3245 Datasheet, PDF (5/16 Pages) Linear Technology – Wide VIN Range, Low Noise, 250mA Buck-Boost Charge Pump

LTC3245
Typical Performance Characteristics T_A = 25°C, unless otherwise noted.
5V Fixed Output Voltage
vs Falling Input Voltage
(Burst Mode Operation)
5.100
5.075
5.050
I_OUT = 1mA
5.025
3.3V Fixed Output Voltage
vs Falling Input Voltage
(Burst Mode Operation)
3.400
3.375
3.350
3.325
I_OUT = 1mA
ADJ Regulation Voltage
vs Temperature
1.220
1.215
1.210
1.205
5.000
3.300
1.200
4.975
4.950
I_OUT = 250mA
4.925
–55°C
25°C
125°C
4.900
2 3 4 5 6 7 8 9 10 11 12 13 14 15
V_IN (V)
3245 G10
3.275
3.250
I_OUT = 250mA
3.225
–55°C
25°C
3.200
125°C
2 3 4 5 6 7 8 9 10 11 12 13 14 15
V_IN (V)
3245 G11
1.195
1.190
1.185
1.180
–60 –30
0 30 60 90
TEMPERATURE (°C)
120 150
3245 G12
5V Output Impedance
vs Temperature (Boost Mode)
30
V_IN = 2.7V
25
V_IN = 3.3V
20
LOW NOISE
15
10
Burst Mode OPERATION
5
0
–60 –30
0 30 60 90
TEMPERATURE (°C)
120 150
3245 G13
3.3V Output Impedance
vs Temperature (Boost Mode)
40
35
V_IN = 3.3V ^{VIN = 2.7V}
30
LOW NOISE
25
20
15
10
Burst Mode OPERATION
5
0
–60 –30
0 30 60 90
TEMPERATURE (°C)
120 150
3245 G14
Output Current vs Input Voltage
(V_OUT 5% Below Regulation)
800
5V Burst Mode
700 ^OPERATION
5V LOW NOISE
600
500
400
3.3V LOW NOISE
300
3.3V Burst Mode
200
OPERATION
100
0
2 3 4 5 6 7 8 9 10 11 12 13 14
V_IN (V)
3245 G15
Operating Mode Transition
Voltage vs Input Voltage
12
11
I_OUT = 1mA
BUCK
10
9
8
RISING
LDO
7
FALLING
6
5
RISING
4
3
FALLING
2
BOOST
1
0
2.5
3
3.5
4
4.5
5
V_OUT (V)
3245 G16
Operating Mode Transition
Voltage vs Input Voltage
12
11
I_OUT = 150mA
BUCK
10
9
8 RISING
LDO
7
FALLING
6
5
RISING
4
3
FALLING
2
BOOST
1
0
2.5
3
3.5
4
4.5
5
V_OUT (V)
3245 G17
Operating Mode Transition
Voltage vs Input Voltage
12
11
I_OUT = 250mA
BUCK
10
RISING
9
8
LDO
7
FALLING
6
RISING
5
4
FALLING
BOOST
3
2
1
0
2.5
3
3.5
4
4.5
5
V_OUT (V)
3245 G18
3245f
For more information www.linear.com/LTC3245
5