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參數(shù)資料
| 型號： | L4947R |
| 廠商： | 意法半導體 |
| 英文描述： | 5V-0.5A VERY LOW DROP REGULATOR WITH RESET |
| 中文描述： | 5V的- 0.5A的非常低，復位降調(diào)節(jié) |
| 文件頁數(shù)： | 3/6頁 |
| 文件大?。?/td> | 57K |
| 代理商： | L4947R |
FUNCTIONAL DESCRIPTION
The L4947/L4947R is a very low drop 5V/0.5A
voltage regulator provided with a reset function
and therefore particularly suited to meet the re-
quirements of supplying the microprocessor sys-
tems used in automotive and industrial applica-
tions.
The block diagram shows the basic structure of
the device : the reference, the error amplifier, the
driver, the power PNP, the protection and reset
functions.
The power stage is a Lateral PNP transistor
which allows a very low dropout voltage (typ.
400mV at T
J
= 25
°
C, max. 750mV over the full
temperature range @ I
O
= 500mA). The typical
curve of the dropout voltage as a function of the
junction temperature is shown in Fig. 1 : that is
the worst case, where I
O
= 500mA.
ELECTRICALCHARACTERISTICS
(refer to thetestcircuit, V
i
= 14. 4V, C
o
= 47
μ
F, ESR < 10
,
R
p
= 1K
, R
L
= 1K
, –40
°
C
≤
T
J
≤
125
°
C, unlessotherwise specified)
Symbol
V
o
Parameter
Test Conditions
I
o
= 0mA to 500mA
Over Full T Range
T
J
= 25
°
C
I
o
= 0mA to (*) 500mA
V
i
= 6V to 26V ;
I
o
= 5mA
I
o
= 5mA to 500mA
I
o
= 500mA, T
J
= 25
°
C
Over Full T Range
I
o
= 0mA, T
J
= 25
°
C
I
o
= 0mA Over Full T
I
o
= 500mA Over Full T
Min.
4.80
Typ.
5.00
Max.
5.20
Unit
V
Output Voltage
4.90
6
5.00
5.10
26
10
V
V
V
i
Operating Input Voltage
Line Regulation
V
o
2
mV
V
o
V
i
–V
o
Load Regulation
Dropout Voltage
15
0.40
60
0.55
0.75
10
13
180
mV
V
V
mA
mA
mA
mV/
°
C
I
q
Quiescent Current
5
6.5
110
– 0.5
Temperature Output Voltage
Drift
Supply Volt. Rej.
SVR
I
o
= 350mA ; f = 120Hz
C
o
= 100
μ
F ;
V
i
= 12V
±
5V
pp
50
60
dB
I
sc
Output Short Circuit Current
0.50
0.80
1.50
A
V
R
Reset Output Saturation Voltage
1.5V < V
o
< V
RT (off)
,
I
R
= 1.6mA
3.0V < V
o
< V
RT (off)
,
I
R
= 8mA
V
O
inRegulation,V
R
=5V
1K
Reset Pull-up to V
o
, T
J
=
25
°
C
T
J
= 25
°
C
L4947:
V
o
@ Reset Out H to L
Transition
L4947R:
V
o
@ Reset Out H to
L Transition
V
o
@ Reset OutL to H
Transition
V
RT (on)
–V
RT (off)
V
d
@ Reset OutL to H
Transition
V
d
@ Reset OutH to L
Transition
0.40
0.40
V
V
I
R
Reset Output Leakage Current
Power On-Off Reset out Peak
Voltage
Power OFF V
o
Threshold
50
0.80
μ
A
V
V
RT peak
0.50
V
RT (off)
4.70
4.75
4.55
Vo–0.15
Vo–0.30
V
V
V
V
RT (on)
Power ON V
o
Threshold
V
RT (off)
+ 0.05
0.05
4.00
V
o
–
0.04
V
V
Hyst
V
d
Power ON-Off Hysteresis
Delay Comparator Threshold
V
V
3.65
4.35
3.20
3.55
3.90
V
V
dH
I
d
Delay Comparator Hysteresis
Delay Capacitor Charging
Current
Delay Capacitor Discharge
Voltage
Power on Reset Delay Time
0.45
20
V
V
d
= 3V, T
J
= 25
°
C
/
μ
A
V
disch
V
o
< V
RT (off)
0.55
1.20
V
T
d
C
d
= 100nF, T
J
= 25
°
C
10
20
30
ms
(*)
For a DC voltage 26 < V
i
< 37V the device is not operating
V
o
T
L4947 - L4947R
3/6
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