LT1521 데이터 시트보기 (PDF) - Linear Technology
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LT1521 Datasheet PDF : 16 Pages
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LT1521/LT1521-3
LT1521-3.3/LT1521-5
TYPICAL PERFORMANCE CHARACTERISTICS
Ripple Rejection
100
90
ILOAD = 150mA
VIN = 6V + 50mVRMS RIPPLE
80
70
60
50
COUT = 33µF
SOLID TANTALUM
40
30
20
COUT = 3.3µF
10
SOLID TANTALUM
0
10
100
1k
10k 100k 1M
FREQUENCY (Hz)
LT1521 • TPC31
LT1521-5
Transient Response
0.2 VIN = 6V
CIN = 0.1µF
0.1 COUT = 1.5µF
0
–0.1
–0.2
150
100
50
0 50 100 150 200 250 300 350 400 450 500
TIME (µs)
LT1521 • TPC33
Load Regulation
0
–5 ∆ILOAD = 1mA TO 300mA
–10
LT1521-5
–15
LT1521*
–20
LT1521-3
LT1521-3.3
–25
–30
–35
VIN = VOUT (NOMINAL + 1V)
*VADJ = VOUT
–40
–50 –25 0 25 50 75
TEMPERATURE (°C)
100 125
LT1521 • TPC32
LT1521-5
Transient Response
0.2
VIN = 6V
CIN = 0.1µF
0.1
COUT = 33µF
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
PIN FUNCTIONS
OUT (Pin 1): The output pin supplies power to the load. A
minimum output capacitor of 1.5µF 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
the output pin of the regulator. In critical applications small
voltage drops caused by the resistance (RP) of PC traces
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 5µA
at the nominal regulated output voltage. This pin is inter-
nally clamped to – 0.6V (one VBE).
8
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