IC LDO REG W/SHTDWN 3.3V 8-SOIC

LT1521CS8-3.3#TRPBF

Manufacturer Part NumberLT1521CS8-3.3#TRPBF
DescriptionIC LDO REG W/SHTDWN 3.3V 8-SOIC
ManufacturerLinear Technology
LT1521CS8-3.3#TRPBF datasheet
 


Specifications of LT1521CS8-3.3#TRPBF

Regulator TopologyPositive FixedVoltage - Output3.3V
Voltage - Input4.3 ~ 20 VVoltage - Dropout (typical)0.5V @ 300mA
Number Of Regulators1Current - Output300mA
Current - Limit (min)320mAOperating Temperature0°C ~ 125°C
Mounting TypeSurface MountPackage / Case8-SOIC (3.9mm Width)
Lead Free Status / RoHS StatusLead free / RoHS Compliant  
1
Page 1
2
Page 2
3
Page 3
4
Page 4
5
Page 5
6
Page 6
7
Page 7
8
Page 8
9
Page 9
10
Page 10
11
12
13
14
15
16
Page 8/16

Download datasheet (201Kb)Embed
PrevNext
LT1521/LT1521-3
LT1521-3.3/LT1521-5
W
U
TYPICAL PERFORMANCE CHARACTERISTICS
Ripple Rejection
100
I
= 150mA
LOAD
90
V
= 6V + 50mV
RIPPLE
IN
RMS
80
70
60
50
40
30
20
10
0
10
100
1k
FREQUENCY (Hz)
LT1521-5
Transient Response
V
= 6V
0.2
IN
C
= 0.1 F
IN
0.1
C
= 1.5 F
OUT
0
–0.1
–0.2
150
100
50
0
50
100
150
200
250
TIME ( s)
U
U
U
PIN
FUNCTIONS
OUT (Pin 1): The output pin supplies power to the load. A
minimum output capacitor of 1.5 F is required to prevent
oscillations, but larger values of output capacitor will be
necessary to deal with larger load transients. See the
Applications Information section for more on output
capacitance and reverse output characteristics.
SENSE (Pin 2): For fixed voltage versions of the LT1521
(LT1521-3, LT1521-3.3, LT1521-5), the sense pin is the
input to the error amplifier. Optimum regulation will be
obtained at the point where the sense pin is connected to
8
C
= 33 F
OUT
SOLID TANTALUM
C
= 3.3 F
OUT
SOLID TANTALUM
10k
100k
1M
LT1521 • TPC31
300
350
400
450
500
LT1521 • TPC33
the output pin of the regulator. In critical applications small
voltage drops caused by the resistance (R
between the regulator and the load, which would normally
degrade regulation, may be eliminated by connecting the
sense pin to the output at the load as shown in Figure 1
(Kelvin Sense Connection). Note that the voltage drop
across the external PC traces will add to the dropout
voltage of the regulator. The sense pin bias current is 5 A
at the nominal regulated output voltage. This pin is inter-
nally clamped to – 0.6V (one V
Load Regulation
0
I
= 1mA TO 300mA
LOAD
–5
–10
LT1521-5
LT1521-3
–15
LT1521*
LT1521-3.3
–20
–25
–30
V
= V
(NOMINAL + 1V)
IN
OUT
–35
*V
= V
ADJ
OUT
–40
–25
0
50
75
100
125
–50
25
TEMPERATURE ( C)
LT1521 • TPC32
LT1521-5
Transient Response
V
= 6V
IN
0.2
C
= 0.1 F
IN
C
= 33 F
0.1
OUT
0
–0.1
–0.2
300
200
100
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
TIME (ms)
LT1521 • TPC34
) of PC traces
P
).
BE
1521335fb