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參數(shù)資料
| 型號： | LT1521 |
| 廠商： | Linear Technology Corporation |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | Cap-Free, NMOS, 150mA Low Dropout Regulator with Reverse Current Protection |
| 中文描述： | 無電容，NMOS管，150mA的低壓差穩(wěn)壓器的反向電流保護 |
| 文件頁數(shù)： | 8/16頁 |
| 文件大?。?/td> | 248K |
| 代理商： | LT1521 |
8
LT1521/LT1521-3
LT1521-3.3/LT1521-5
TYPICAL PERFOR
M
A
CE CHARACTERISTICS
U
OUT (Pin 1):
The output pin supplies power to the load. A
minimum output capacitor of 1.5
μ
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
PI
FU
CTIO
N
S
U
U
LT1521-5
Transient Response
TIME (
μ
s)
0
O
D
L
(
0.2
0.1
0
–0.1
–0.2
150
100
50
400
LT1521 TPC33
100
50
150
250
350
450
200
300
500
V
IN
= 6V
C
IN
= 0.1
μ
F
C
OUT
= 1.5
μ
F
FREQUENCY (Hz)
R
100
90
80
70
60
50
40
30
20
10
0
10
1k
10k
1M
LT1521 TPC31
100
100k
I
LOAD
= 150mA
V
IN
= 6V + 50mV
RMS
RIPPLE
C
= 33
μ
F
SOLID TANTALUM
C
= 3.3
μ
F
SOLID TANTALUM
Ripple Rejection
Load Regulation
TEMPERATURE (
°
C)
–50
L
25
LT1521 TPC32
–25
0
50
0
–5
–10
–15
–20
–25
–30
–35
–40
75
100
125
I
LOAD
= 1mA TO 300mA
LT1521-3.3
LT1521-3
LT1521*
LT1521-5
V
IN
= V
(NOMINAL + 1V)
*V
ADJ
= V
OUT
LT1521-5
Transient Response
TIME (ms)
0
O
D
L
(
0.2
0.1
0
–0.1
–0.2
300
200
100
4.0
LT1521 TPC34
1.0
0.5
1.5
2.5
3.5
4.5
2.0
3.0
5.0
V
IN
= 6V
C
IN
= 0.1
μ
F
C
OUT
= 33
μ
F
the output pin of the regulator. In critical applications small
voltage drops caused by the resistance (R
P
) 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 5
μ
A
at the nominal regulated output voltage. This pin is inter-
nally clamped to –0.6V (one V
BE
).
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