Datasheet

LTC3221/
LTC3221-3.3/LTC3221-5
4
3221f
LOAD CURRENT (mA)
0
50
60
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
SUPPLY VOLTAGE (V)
1.8
EFFICIENCY (%)
100
90
80
70
60
50
40
30
20
10
0
2.2 2.6 2.82.0 2.4 3.0 3.2
3221 G12
THEORETICAL MAX
I
OUT
= 1mA
I
OUT
= 30mA
3221 G11
LOAD CURRENT (mA)
0.01
EXCESS INPUT CURRENT (mA)
10
1
0.1
0.01
0.001
1010.1
100
V
IN
= 2.5V
SUPPLY VOLTAGE (V)
1.5
NO-LOAD INPUT CURRENT (µA)
16
14
12
4
2
8
6
10
0
2.0 2.5 3.0 3.5 4.0 4.5
3221 G10
T
A
= –45°C
T
A
= 90°C
T
A
= 25°C
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 G09
V
IN
= 1.8V
V
OUT
= 3V
3221 G07
LOAD CURRENT (mA)
0
OUTPUT VOLTAGE (V)
3.36
3.34
3.32
3.30
3.24
3.26
3.28
3.22
3.20
3.18
3.16
10080604020
120
V
IN
= 3.2V
V
IN
= 2.5V
V
IN
= 1.8V
LOAD CURRENT (mA)
110
100
90
40
50
70
80
60
120
SUPPLY VOLTAGE (V)
1.5 2.0 2.5 3.53.0
3221 G08
T
A
= –45°C
T
A
= 90°C
V
OUT
= 3.168V
T
A
= 25°C
V
IN
= 2V
I
LOAD
= 60mA
C
OUT
= 4.7µF, 6.3V, SIZE 0603
3221 G14
1µs/DIV
V
OUT
20mV/DIV
(AC-COUPLED)
V
IN
= 2V
I
LOAD
= 0mA TO 60mA STEP
C
OUT
= 4.7µF, 6.3V, SIZE 0603
3221 G15
5µs/DIV
V
OUT
20mV/DIV
(AC-COUPLED)
60mA
I
OUT
0mA
Load Regulation
Output Load Capability at 4%
Below Regulation
Effective Open-Loop Output
Resistance vs Temperature
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
TYPICAL PERFOR A CE CHARACTERISTICS
UW
(LTC3221-3.3 only)