Datasheet

LTC3221/
LTC3221-3.3/LTC3221-5
5
3221f
LOAD CURRENT (mA)
0
50
60
90
80
70
8060
3221 G13
40
30
20 40 100
20
10
0
OUTPUT RIPPLE (mV
P-P
)
C
OUT
= 2.2µF
C
OUT
= 4.7µF
V
IN
= 3V
SUPPLY VOLTAGE (V)
EFFICIENCY (%)
100
90
80
70
60
50
40
30
20
10
0
3221 G21
THEORETICAL MAX
I
OUT
= 1mA
I
OUT
= 30mA
2.7 3.0 3.3 3.6 3.9 4.2 4.5
SUPPLY VOLTAGE (V)
2.7
NO-LOAD INPUT CURRENT (µA)
16
14
12
4
2
8
6
10
0
3.0 3.3 3.6 3.9 4.2 4.5
3221 G19
T
A
= –45°C
T
A
= 90°C
T
A
= 25°C
3221 G20
LOAD CURRENT (mA)
0.01
EXCESS INPUT CURRENT (mA)
10
1
0.1
0.01
0.001
1010.1
100
V
IN
= 3V
LOAD CURRENT (mA)
110
100
90
40
50
70
80
60
120
SUPPLY VOLTAGE (V)
2.7 3.0 3.3 4.23.93.6
3221 G17
T
A
= –45°C
T
A
= 90°C
V
OUT
= 4.8V
T
A
= 25°C
3221 G16
LOAD CURRENT (mA)
0
OUTPUT VOLTAGE (V)
5.10
5.05
5.00
4.95
4.85
4.90
4.80
10080604020
120
V
IN
= 4.2V
V
IN
= 3.6V
V
IN
= 2.7V
EFFECTIVE OPEN-LOOP OUTPUT RESISTANCE (Ω)
15
14
13
9
7
11
10
12
5
8
6
TEMPERATURE (°C)
–50
–25 0 25 7550 100
3221 G18
V
IN
= 2.7V
V
OUT
= 4.5V
Load Regulation
Output Load Capability at 4%
Below Regulation
Effective Open-Loop Output
Resistance vs Temperature
TYPICAL PERFOR A CE CHARACTERISTICS
UW
(LTC3221-5 only)
No-Load Input Current vs
Supply Voltage
Extra Input Current vs Load
Current (I
IN
-2 I
LOAD
) Effi ciency vs Supply Voltage
Output Ripple vs Load Current Output Ripple Load Transient Response
V
IN
= 3V
I
LOAD
= 60mA
C
OUT
= 4.7µF, 6.3V, SIZE 0603
3221 G23
1µs/DIV
V
OUT
50mV/DIV
(AC-COUPLED)
V
IN
= 3V
I
LOAD
= 0mA TO 60mA STEP
C
OUT
= 4.7µF, 6.3V, SIZE 0603
3221 G24
5µs/DIV
V
OUT
50mV/DIV
(AC-COUPLED)
60mA
I
OUT
0mA