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Электронный компонент: L4987CPT120

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L4987
SERIES
VERY LOW DROP VOLTAGE REGULATORS
WITH INHIBIT AND DROPOUT CONTROL FLAG
October 1998
s
VERY LOW DROPOUT VOLTAGE (0.25V
TYP.)
s
DROPOUT CONTROL FLAG
s
VERY LOW QUIESCENT CURRENT
(TYP. 90
A IN OFF MODE, 500
A IN ON
MODE)
s
OUTPUT CURRENT UP TO 200 mA
s
LOGIC-CONTROLLED ELECTRONIC
SHUTDOWN
s
OUTPUT VOLTAGES OF 3V, 5V 8.7V 12V
s
INTERNAL CURRENT AND THERMAL LIMIT
s
ONLY 2.2
F FOR STABILITY
s
AVAILABLE IN
2% SELECTION AT 25
o
C
s
SUPPLY VOLTAGE REJECTION: 70 dB (TYP.)
DESCRIPTION
The L4987 is a very low drop regulator available
in PPAK. The very low drop-voltage (0.5V Max at
200 mA) and the very low quiescent current make
it particularly suitable for low noise, low power
applications, and in battey powered systems. The
input dump protection up to 40V makes it ideal for
automotive
applications.
a
shutdown
Logic
Control
function
is
available
(pin2,
TTL
compatible). This means that when the device is
used as a local regulator, it is possible to put a
part of the boad in standby, decreasing the total
power consumption. The regulator employs an
output pin (open collector) providing a logic signal
when the pass transistor is in saturation at low
input voltage, this signal can be used to prevent
the pop-up phenomenon in the car radio. In
battery powered systems (the cellular phone,
notebook) it is possible to use the flag to monitor
the battery charge status through the dropout of
the regulator.
SCHEMATIC DIAGRAM
PPAK
1/11
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V
i
DC Input Voltage
40
V
I
o
Output Current
I nternally limited
mA
P
tot
Power Dissipation
I nternally limited
mW
T
st g
Storage Temperature Range
- 40 to 150
o
C
T
op
Operating Junction Temperature Range
- 40 to 125
o
C
Absolute Maximum Rating are those values beyond wich damage to the device may occur. Functional operation under these conditions is
not implied.
THERMAL DATA
Symbol
Parameter
DPAK/PPAK
Unit
R
thj- ca se
R
thj- amb
Thermal Resistance Junction-case
Thermal Resistance Junction-ambient
8
100
o
C/W
o
C/W
CONNECTION DIAGRAM (top view)
ORDERING NUMBERS
Type
Output Voltage
L4987CPT30 (*)
L4987CPT50 (*)
L4987CPT87 (*)
L4987CPT120 (*)
3 V
5 V
8. 7 V
12 V
(*) Available even in tape & reel
L4987 SERIES
2/11
ELECTRICAL CHARACTERISTICS FOR L4987CPT30 (refer to the test circuits, V
I
= 6 V,
I
OUT
= 5 mA, T
j
= 25
o
C, C
i
= 0.1
F, C
o
= 2.2
F unless otherwise specified)
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
o
Output Voltage
I
o
= 200 mA, V
i
= 6 V
I
o
= 200 mA, V
i
= 6 V -40<T
J
<125
o
C
2.94
2.88
3
3.06
3.12
V
V
V
i
Operating Input Voltage
I
o
= 200 mA
3.62
18
V
I
o ut
Output Current Limit
250
A
V
o
Line Regulation
V
i
= 4.3 to 18 V, I
o
= 0.5 mA
2.4
14
mV
V
o
Load Regulation
V
i
= 4.1 V
I
o
= 0.5 to 200 mA
3
20
mV
I
d
Quiescent Current
ON MODE
V
i
= 4.3 to 18 V I
o
= 0 mA
V
i
= 4.3 to 18 V I
o
= 200 mA
0.7
1.5
1
6
mA
mA
OFF MODE V
i
= 12 V
90
180
A
SVR
Supply Voltage Rejection
I
o
= 5 mA V
i
= 5.3 V
1V
f = 120 Hz
f = 1 KHz
f = 10 KHz
80
75
60
dB
dB
dB
V
d
Dropout Voltage
I
o
= 200 mA
I
o
= 200 mA
-40 < T
J
< 125
o
C
0.25
0.5
0.7
V
V
V
il
Control Input Logic Low
-40 < T
J
< 125
o
C
0.8
V
V
ih
Control Input Logic High
-40 < T
J
< 125
o
C
2
V
I
i
Control Input Current
10
A
C
O
Output Bypass Capacitance
ESR = 0.5 to 10
I
o
= 0 to 200 mA
-40 < T
J
< 125
o
C
2
10
F
V
fl
Control Flag Output Low
V
i
- V
o
< V
cesat
power,
I
fl
= 6 mA
I
o
= 200 mA
0.5
V
I
fh
Control Flag Output High
Leakage Current
V
i
> 3.62 V
V
oh
= 15 V
10
A
L4987 SERIES
3/11
ELECTRICAL CHARACTERISTICS FOR L4987CPT50 (refer to the test circuits, V
I
= 8 V,
I
OUT
= 5mA, T
j
= 25
o
C, C
i
= 0.1
F, C
o
= 2.2
F unless otherwise specified)
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
o
Output Voltage
I
o
= 200 mA, V
i
= 8 V
I
o
= 200 mA, V
i
= 8 V -40<T
J
<125
o
C
4.9
4.8
5
5.1
5.2
V
V
V
i
Operating Input Voltage
I
o
= 200 mA
5.7
18
V
I
o ut
Output Current Limit
250
A
V
o
Line Regulation
V
i
= 6.3 to 18 V, I
o
= 0.5 mA
3
20
mV
V
o
Load Regulation
V
i
= 3.6 V
I
o
= 0.5 to 200 mA
3
20
mV
I
d
Quiescent Current
ON MODE
V
i
= 6.3 to 18 V I
o
= 0 mA
V
i
= 6.3 to 18 V I
o
= 200 mA
0.7
1.5
1
6
mA
mA
OFF MODE V
i
= 12 V
90
180
A
SVR
Supply Voltage Rejection
I
o
= 5 mA V
i
= 7.3 V
1V
f = 120 Hz
f = 1 KHz
f = 10 KHz
76
71
58
dB
dB
dB
V
d
Dropout Voltage
I
o
= 200 mA
I
o
= 200 mA
-40 < T
J
< 125
o
C
0.3
0.5
0.7
V
V
V
il
Control Input Logic Low
-40 < T
J
< 125
o
C
0.8
V
V
ih
Control Input Logic High
-40 < T
J
< 125
o
C
2
V
I
i
Control Input Current
10
A
C
O
Output Bypass Capacitance
ESR = 0.5 to 10
I
o
= 0 to 200 mA
-40 < T
J
< 125
o
C
2
10
F
V
fl
Control Flag Output Low
V
i
- V
o
< V
cesat
power,
I
fl
= 6 mA
I
o
= 200 mA
0.5
V
I
fh
Control Flag Output High
Leakage Current
V
i
> 5.85 V
V
oh
= 15 V
10
A
L4987 SERIES
4/11
ELECTRICAL CHARACTERISTICS FOR L4987CPT87 (refer to the test circuits, V
I
= 11.7V,
I
OUT
= 5mA, T
j
= 25
o
C, C
i
= 0.1
F, C
o
= 2.2
F unless otherwise specified)
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
o
Output Voltage
I
o
= 200 mA, V
i
=11.7 V
I
o
= 200 mA, V
i
=11.7 V -40<T
J
<125
o
C
8.526
8.35
8.7
8. 874
9.05
V
V
V
i
Operating Input Voltage
I
o
= 200 mA
9.55
18
V
I
o ut
Output Current Limit
250
A
V
o
Line Regulation
V
i
= 10 to 18 V, I
o
= 0.5 mA
4
24
mV
V
o
Load Regulation
V
i
= 10 V
I
o
= 0.5 to 200 mA
3
20
mV
I
d
Quiescent Current
ON MODE
V
i
= 10 to 18 V I
o
= 0 mA
V
i
= 10 to 18 V I
o
= 200 mA
0.5
3
1
6
mA
mA
OFF MODE V
i
= 12 V
90
180
A
SVR
Supply Voltage Rejection
I
o
= 5 mA V
i
= 11 V
1V
f = 120 Hz
f = 1 KHz
f = 10 KHz
71
68
55
dB
dB
dB
V
d
Dropout Voltage
I
o
= 200 mA
I
o
= 200 mA
-40 < T
J
< 125
o
C
0.3
0.5
0.7
V
V
V
il
Control Input Logic Low
-40 < T
J
< 125
o
C
0.8
V
V
ih
Control Input Logic High
-40 < T
J
< 125
o
C
2
V
I
i
Control Input Current
10
A
C
O
Output Bypass Capacitance
ESR = 0.5 to 10
I
o
= 0 to 200 mA
-40 < T
J
< 125
o
C
2
10
F
V
fl
Control Flag Output Low
V
i
- V
o
< V
cesat
power,
I
fl
= 6 mA
I
o
= 200 mA
0.5
V
I
fh
Control Flag Output High
Leakage Current
V
i
> 9.55 V
V
oh
= 15 V
10
A
L4987 SERIES
5/11
ELECTRICAL CHARACTERISTICS FOR L4987CPT120 (refer to the test circuits, V
I
= 15V,
I
OUT
= 5mA, T
j
= 25
o
C, C
i
= 0.1
F, C
o
= 2.2
F unless otherwise specified)
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
o
Output Voltage
I
o
= 200 mA, V
i
=15 V
I
o
= 200 mA, V
i
=15 V -40<T
J
<125
o
C
11.76
11.52
12
8. 874
9.05
V
V
V
i
Operating Input Voltage
I
o
= 200 mA
12.75
18
V
I
o ut
Output Current Limit
250
A
V
o
Line Regulation
V
i
= 13.5 to 18 V, I
o
= 0.5 mA
5
30
mV
V
o
Load Regulation
V
i
= 13.5 V
I
o
= 0.5 to 200 mA
3
20
mV
I
d
Quiescent Current
ON MODE
V
i
= 13.5 to 18 V I
o
= 0 mA
V
i
= 13.5 to 18 V I
o
= 200 mA
0.5
3
1
6
mA
mA
OFF MODE V
i
= 12 V
90
180
A
SVR
Supply Voltage Rejection
I
o
= 5 mA V
i
= 14.5 V
1V
f = 120 Hz
f = 1 KHz
f = 10 KHz
67
64
51
dB
dB
dB
V
d
Dropout Voltage
I
o
= 200 mA
I
o
= 200 mA
-40 < T
J
< 125
o
C
0.3
0.5
0.7
V
V
V
il
Control Input Logic Low
-40 < T
J
< 125
o
C
0.8
V
V
ih
Control Input Logic High
-40 < T
J
< 125
o
C
2
V
I
i
Control Input Current
10
A
C
O
Output Bypass Capacitance
ESR = 0.5 to 10
I
o
= 0 to 200 mA
-40 < T
J
< 125
o
C
2
10
F
V
fl
Control Flag Output Low
V
i
- V
o
< V
cesat
power,
I
fl
= 6 mA
I
o
= 200 mA
0.5
V
I
fh
Control Flag Output High
Leakage Current
V
i
> 12.75 V
V
oh
= 15 V
10
A
L4987 SERIES
6/11
Output and Flag Voltage vs Input Voltage
Output and Flag Voltage vs Input Voltage
Output and Flag Voltage vs Input Voltage
Output Voltage vs Input Voltage
Output Voltage vs Input Voltage
TYPICAL PERFORMANCE CHARACTERISTICS (unless otherwise specified T
J
=25
o
C, C
IN
=C
OUT
=1
F)
Output Voltage vs Input Voltage
L4987 SERIES
7/11
APPLICATION HINT OF L4987CPT30
How to use the control flag
The flag produces a logic "low" whenever the
output fall out out of regulation. An "out of
regulation condition can result from:
1) Low Input Voltage (V
IN
V
OUT
+ V
DROP
)
2) Curent Limiting
3) Thermal Limiting
Figure 1 to 2 show the typical behaviour of the
output voltage and the control flag versus the
input voltage and the temperatre. No hysteresis is
implemented; so the response of V
OUT
and V
FLAG
are the same either when the V
IN
ramps up or
down.
The control flag is an open collector which
requires an external pull-up resistor. This may be
connected to the regulator output (Figure 3) or
some other supply voltage (Figure 4).
Using the regulator output prevents an invalid
"high" on the flag which occurs if it is pulled up to
an external voltage while the regulator input
voltage is reduced below about 2V (Figue 5).
Concerning the pull-up resistor its value must be
properly chosen as suggested below. When "low"
as it is possible to see in figure 6 the control flag
voltage is:
V
FLAG(LOW)
= V
CE
= 0.5 = V
SUPPLY
- R
PULL
x I
FL
V
SUPPLY
is chosen by design and, thus is known,
while I
FL
must be at maximum 10mA. Then
0.5V
V
SUPPLY
- R
PULL
x 10mA
The minimum value of R
PULL
, is, so, determined
by the following equation:
R
PULL(min)
V
SUPPLY
-
0.5
10
mA
Regarding the maximum value of R
PULL
note that
its value depends of the type of logic used
(CMOS, TTL etc.), the transistor leackage current
and the presence or not of a load on V
FLAG
.
The following example shows how to determine
the R
PULL
max in the case of CMOS logic, no
load and 10
A (for L4978 it is the maximum value
of I
FH
) of control flag leakage current.
Becaause of CMOS logic:
V
FLAG(HIGH)
2
3
V
SUPPLY
But:
V
FLAG(HIGH)
= V
SUPPLY
- R
PULL
x I
FH
2
3
V
SUPPLY
so, the maximum value is determined by the
following equation:
R
PULL(MAX)
1
3
V
SUPPLY
10
A
Figure 1: Output and Flag Voltage vs Input
Figure 2: Flag Voltage vs Input
L4987 SERIES
8/11
Figure 3: Test Circuit
Figure 4: Test Circuit
Figure 5: Output and Flag Voltage vs Input
Figure 6: Equivalent Output Circuit
L4987 SERIES
9/11
DIM.
mm
inch
MIN.
TYP.
MAX.
MIN.
TYP.
MAX.
A
2.2
2.4
0.086
0.094
A1
0.9
1.1
0.035
0.043
A2
0.03
0.23
0.001
0.009
B
0.4
0.6
0.015
0.023
B2
5.2
5.4
0.204
0.212
C
0.45
0.6
0.017
0.023
C2
0.48
0.6
0.019
0.023
D
6
6.2
0.236
0.244
E
6.4
6.6
0.252
0.260
G
4.9
5.25
0.193
0.206
G1
2.38
2.7
0.093
0.106
H
9.35
10.1
0.368
0.397
L2
0.8
1
0.031
0.039
L4
0.6
1
0.023
0.039
0078180/B
PPAK MECHANICAL DATA
L4987 SERIES
10/11
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences
of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is
granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this publication are
subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products
are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.
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.
L4987 SERIES
11/11