LTC3221_15 Datasheet, PDF (4/12 Pages) Linear Technology – Micropower, Regulated Charge Pump

LTC3221/
LTC3221-3.3/LTC3221-5
TYPICAL PERFOR A CE CHARACTERISTICS (LTC3221-3.3 only)
Load Regulation
3.36
3.34
3.32
V_IN = 3.2V
3.30
3.28
V_IN = 2.5V
3.26
3.24
V_IN = 1.8V
3.22
3.20
3.18
3.16
0
20 40 60 80 100 120
LOAD CURRENT (mA)
3221 G07
No-Load Input Current vs
Supply Voltage
16
14
12
10
T_A = 90°C
8 ^{TA = 25°C}
6
T_A = –45°C
4
2
0
1.5 2.0 2.5 3.0 3.5 4.0 4.5
SUPPLY VOLTAGE (V)
3221 G10
Output Load Capability at 4%
Below Regulation
120 _{VOUT = 3.168V}
110
T_A = –45°C
100
90
T_A = 90°C
80
T_A = 25°C
70
60
50
40
1.5
2.0
2.5
3.0
SUPPLY VOLTAGE (V)
3.5
3221 G08
Extra Input Current vs Load
Current (I_IN-2 I_LOAD)
10 _{VIN = 2.5V}
1
0.1
0.01
0.001
0.01
0.1
1
10
LOAD CURRENT (mA)
100
3221 G11
Effective Open-Loop Output
Resistance vs Temperature
15 _{VIN = 1.8V}
14 V_OUT = 3V
13
12
11
10
9
8
7
6
5
–50 –25 0
25 50 75 100
TEMPERATURE (°C)
3221 G09
Efficiency vs Supply Voltage
100
90
THEORETICAL MAX
80
70
60
I_OUT = 30mA
I_OUT = 1mA
50
40
30
20
10
0
1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2
SUPPLY VOLTAGE (V)
3221 G12
Output Ripple vs Load Current
70
Output Ripple
60
C_OUT = 2.2µF
50
40
V_OUT
20mV/DIV
(AC-COUPLED)
30
C_OUT = 4.7µF
20
10
0
0
20
40
60
80 100
LOAD CURRENT (mA)
3221 G13
1µs/DIV
V_IN = 2V
I_LOAD = 60mA
C_OUT = 4.7µF, 6.3V, SIZE 0603
4
Load Transient Response
V_OUT
20mV/DIV
(AC-COUPLED)
60mA
I_OUT
0mA
3221 G14
5µs/DIV
V_IN = 2V
I_LOAD = 0mA TO 60mA STEP
C_OUT = 4.7µF, 6.3V, SIZE 0603
3221 G15
3221f