LTC3221_15 Datasheet, PDF (5/12 Pages) Linear Technology – Micropower, Regulated Charge Pump

LTC3221/
LTC3221-3.3/LTC3221-5
TYPICAL PERFOR A CE CHARACTERISTICS (LTC3221-5 only)
Load Regulation
5.10
5.05
V_IN = 4.2V
5.00
V_IN = 3.6V
4.95
V_IN = 2.7V
4.90
4.85
4.80
0
20 40 60 80 100 120
LOAD CURRENT (mA)
3221 G16
No-Load Input Current vs
Supply Voltage
16
14
12
10
T_A = 90°C
8
6
4
T_A = 25°C
T_A = –45°C
2
0
2.7 3.0 3.3 3.6 3.9 4.2 4.5
SUPPLY VOLTAGE (V)
3221 G19
Output Load Capability at 4%
Below Regulation
120 _{VOUT = 4.8V}
110
T_A = –45°C
100
90
T_A = 90°C
80
T_A = 25°C
70
60
50
40
2.7
3.0 3.3 3.6 3.9 4.2
SUPPLY VOLTAGE (V)
3221 G17
Extra Input Current vs Load
Current (I_IN-2 I_LOAD)
10 _{VIN = 3V}
1
0.1
0.01
0.001
0.01
0.1
1
10
LOAD CURRENT (mA)
100
3221 G20
Effective Open-Loop Output
Resistance vs Temperature
15 _{VIN = 2.7V}
14 V_OUT = 4.5V
13
12
11
10
9
8
7
6
5
–50 –25 0
25 50 75 100
TEMPERATURE (°C)
3221 G18
Efficiency vs Supply Voltage
100
90
80
THEORETICAL MAX
70
60 ^{IOUT = 1mA} _{IOUT = 30mA}
50
40
30
20
10
0
2.7 3.0 3.3 3.6 3.9 4.2 4.5
SUPPLY VOLTAGE (V)
3221 G21
Output Ripple vs Load Current
90 _{VIN = 3V}
80
Output Ripple
70
C_OUT = 2.2µF
60
50
V_OUT
50mV/DIV
(AC-COUPLED)
40
C_OUT = 4.7µF
30
20
10
0
0
20
40
60
80 100
LOAD CURRENT (mA)
1µs/DIV
V_IN = 3V
I_LOAD = 60mA
C_OUT = 4.7µF, 6.3V, SIZE 0603
3221 G13
Load Transient Response
V_OUT
50mV/DIV
(AC-COUPLED)
60mA
I_OUT
0mA
3221 G23
5µs/DIV
V_IN = 3V
I_LOAD = 0mA TO 60mA STEP
C_OUT = 4.7µF, 6.3V, SIZE 0603
3221 G24
3221f
5