Datasheet
LTC3221/
LTC3221-3.3/LTC3221-5
3
3221f
SHORT-CIRCUIT CURRENT (mA)
110
130
90
50
70
150
SUPPLY VOLTAGE (V)
1.5 2.0 2.5 3.0 3.5 4.0 4.5
3221 G06
T
A
= –45°C
T
A
= 90°C
T
A
= 25°C
TEMPERATURE (°C)
–50 –25 0 25 7550 100 125
3221 G05
V
IN
= 3.2V
SHDN HI-TO-LO THRESHOLD (V)
0.7
0.8
0.6
0.4
0.5
0.9
V
IN
= 2.5V
V
IN
= 1.8V
TEMPERATURE (°C)
–50
–25 0 25 7550 100 125
3221 G04
V
IN
= 3.2V
V
IN
= 2.5V
V
IN
= 1.8V
SHDN LO-TO-HI THRESHOLD (V)
0.7
0.8
0.6
0.4
0.5
0.9
THRESHOLD VOLTAGE (V)
0.7
0.8
0.6
0.4
0.5
0.9
HIGH-TO-LOW THRESHOLD
LOW-TO-HIGH THRESHOLD
SUPPLY VOLTAGE (V)
1.5 2.0 2.5 3.0 3.5 4.0 4.5
3221 G03
The ● denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
IN
= 2.5V (LTC3221-3.3/LTC3221) or 3V (LTC3221-5),
⎯
S
⎯
H
⎯
D
⎯
N = V
IN
,
C
FLY
= 1µF, C
IN
= 2.2µF, C
OUT
= 2.2µF, unless otherwise specifi ed.
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC3221EDC-X is guaranteed to meet performance
specifi cations from 0°C to 70°C. Specifi caiton over the –40°C to 85°C
operating temperature range are assured by design, characterization and
correlation with statisitical process controls.
Note 3: Guaranteed by design, not subject to test.
Note 4: R
OL
= (2V
IN
– V
OUT
)/I
OUT
.
ELECTRICAL CHARACTERISTICS
Oscillator Frequency vs
Supply Voltage
Oscillator Frequency vs
Temperature
⎯
S
⎯
H
⎯
D
⎯
N Threshold Voltage vs
Supply Voltage
⎯
S
⎯
H
⎯
D
⎯
N LO-to-HI Threshold vs
Temperature
⎯
S
⎯
H
⎯
D
⎯
N HI-to-LO Threshold vs
Temperature
Short-Circuit Current vs
Supply Voltage
TYPICAL PERFOR A CE CHARACTERISTICS
UW
SUPPLY VOLTAGE (V)
1.5
FREQUENCY (kHz)
800
750
700
500
450
600
550
650
400
2.0 2.5 3.0 3.5 4.0 4.5
3221 G01
FREQUENCY (kHz)
800
750
700
500
450
600
550
650
400
TEMPERATURE (°C)
–50
–25 0 25 7550 100 125
3221 G02
V
IN
= 4.5V
V
IN
= 2.5V
V
IN
= 1.8V
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
LTC3221-3.3/LTC3221-5
I
⎯
S
⎯
H
⎯
D
⎯
N
Shutdown Supply Current V
OUT
= 0V,
⎯
S
⎯
H
⎯
D
⎯
N = 0V
●
1µA
V
IH
⎯
S
⎯
H
⎯
D
⎯
N Input Threshold (High)
●
1.3 V
V
IL
⎯
S
⎯
H
⎯
D
⎯
N Input Threshold (Low)
●
0.4 V
I
IH
⎯
S
⎯
H
⎯
D
⎯
N Input Current (High)
⎯
S
⎯
H
⎯
D
⎯
N = V
IN
●
–1 1 µA
I
IL
⎯
S
⎯
H
⎯
D
⎯
N Input Current (Low)
⎯
S
⎯
H
⎯
D
⎯
N = 0V
●
–1 1 µA
LTC3221/LTC3221-3.3/LTC3221-5
f
OSC
Switching Frequency V
OUT
= 2.5V 600 kHz
V
UVLO
UVLO Threshold 1V