Datasheet

LTC3221/
LTC3221-3.3/LTC3221-5
2
3221f
V
IN
,
⎯
S
⎯
H
⎯
D
⎯
N, FB ............................................. – 0.3V to 6V
V
OUT
to GND ............................................. – 0.3V to 5.5V
V
OUT
Short-Circuit Duration ............................ Indefi nite
Operating Temperature Range (Note 2) .. – 40°C to 85°C
Storage Temperature Range .................. – 65°C to 125°C
Maximum Junction Temperature .......................... 125°C
(Note 1)
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.
ELECTRICAL CHARACTERISTICS
ABSOLUTE AXI U RATI GS
W
WW
U
FOR ATIOPACKAGE/ORDER I
UUW
TOP VIEW
4
57
6
3
2
1C
+
C
–
SHDN/FB*
V
OUT
V
IN
GND
T
JMAX
= 125°C, θ
JA
= 80°C/W
EXPOSED PAD IS GND (PIN 7) MUST BE SOLDERED TO PCB
*
⎯
S
⎯
H
⎯
D
⎯
N ON LTC3221-3.3;LTC3221-5 FB ON LTC3221
ORDER PART NUMBER DC PART MARKING
LTC3221EDC
LTC3221EDC-3.3
LTC3221EDC-5
LCCP
LBQP
LCCN
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
LTC3221-3.3
V
IN
Input Supply Voltage
●
1.8 4.4 V
V
OUT
Output Voltage 1.8V ≤ V
IN
≤ 4.4V, I
OUT
≤ 25mA
2V ≤ V
IN
< 4.4V, I
OUT
≤ 60mA ● 3.168 3.3 3.432 V
I
CC
Operating Supply Current I
OUT
= 0mA
●
815 µA
V
R
Output Ripple V
IN
= 2V, I
OUT
= 60mA, C
OUT
= 4.7µF (Note 3) 35 mV
P-P
η
Effi ciency V
IN
= 2V, I
OUT
= 60mA (Note 3) 82 %
I
SC
Output Short-Circuit Current V
OUT
= 0V
●
120 240 mA
LTC3221-5
V
IN
Input Supply Voltage
●
2.7 5.5 V
V
OUT
Output Voltage 2.7V ≤ V
IN
≤ 5.5V, I
OUT
< 25mA
3V ≤ V
IN
≤ 5.5V, I
OUT
< 60mA ● 4.8 5 5.2 V
I
CC
Operating Supply Current I
OUT
= 0mA
●
815 µA
V
R
Output Ripple V
IN
= 3V, I
OUT
= 60mA, C
OUT
= 4.7µF (Note 3) 45 mV
P-P
η Effi ciency V
IN
= 3V, I
OUT
= 60mA (Note 3) 82 %
I
SC
Output Short-Circuit Current V
OUT
= 0V
●
120 240 mA
LTC3221
V
IN
Input Supply Voltage
●
1.8 5.5 V
V
FB
Feedback Voltage
●
1.181 1.23 1.279 V
R
OL
Open-Loop Impedance V
IN
= 1.8V, V
OUT
= 3V (Note 4)
●
10 20
Ω
I
CC
Operating Supply Current I
OUT
= 0mA
●
512 µA
I
FB
FB Input Current FB = 1.33V, V
IN
= 2V
●
–100 100 nA