ST L4987 User Manual
查询L4987CXX120供应商
VERY LOW DROP VOLTAGE REGULATORS
WITH INHIBIT AND DROPOUT CONTROL FLAG
■ VERY LOW DROPOUT VOLTAGE
(0.25V TYP.)
■ DROPOUT CONTROL FLAG
■ VERY LOW QUIESCENT CURRENT
■ (TYP.90mAINOFFMODE,500mAINON
MODE)
■ OUTPUT CURRENT UP TO 200 mA
■ LOGIC-CONTROLLED ELECTRONIC
SHUTDOWN
■ OUTPUT VOLTAGES OF 3V, 3.3V, 5V,8.7V,
12V
■ INTERNAL CURRENT AND THERMAL LIM IT
■ ONLY 2.2µF FOR STABILITY
■ AVAILABLE IN ±2% SELECTION AT 25°C
■ SUPPLY VOLTAGE REJECTION: 70dB (TYP.)
L4987
SERIES
PPAK
DESCRIPTION
The L4987 is a verylow drop regulator available in
PPAK. The very low drop-voltage (0.5V Max at
200 mA) and the very low quiescent c urrent make
it particularly suitable for low noise, low power
applications, and in battery 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
SCHEMATIC DIAGRAM
of the board 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 l ow
input v olt age, 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.
1/13June 2003
L4987 SERIES
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter² Value Unit
V
I
P
T
T
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is
not implied.
THERMAL DATA
Symbol Parameter PPAK Unit
R
thj-case
R
thj-amb
CONNECTION DIAGRAM (top view)
DC Input Voltage
I
Output Current
O
Power Dissipation
tot
Storage Temperature Range
stg
Operating Junction Temperature Range
op
Thermal Resistance Junction-case
Thermal Resistance Junction-ambient
40 V
Internally Limited
Internally Limited
-40 to 150 °C
-40 to 125 °C
8°C/W
100 °C/W
ORDERING CODES
(*)Availableevenintape&reel.
TYPE OUTPUT VOLTAGE
L4987CPT30 (*) 3.0 V
L4987CPT33 (*) 3.3 V
L4987CPT50 (*) 5.0 V
L4987CPT87 (*) 8.7 V
L4987CPT120 (*) 12 V
2/13
L4987 SERIES
ELECTRICAL CHARACTERISTICS OF L4987CPT30 (refer to the test circuits, VI=6V,IO=5mA,
T
= 25°C, CI=0.1µF,CO= 2.2 µF unless otherwise specified)
J
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
Output Voltage IO= 200 mA VI= 6 V 2.94 3 3.06 V
O
= 200 mA VI=6V TJ=-40 to 125°C 2.88 3.12
I
O
Operating Input Voltage IO= 200 mA 3.62 18 V
V
I
Output Current Limit 250 A
I
out
∆V
∆V
SVR Supply Voltage Rejection I
Line Regulation VI= 4.3 to 18 V IO= 0.5 mA 2.4 14 mV
O
Load Regulation VI= 4.1 V IO= 0.5 to 200 mA 3 20 mV
O
Quiescent Current
I
d
ON MODE
OFF MODE V
VI= 4.3 to 18 V IO= 0 mA 0.7 1 mA
= 4.3 to 18 V IO= 200 mA 1.5 6
V
I
= 12 V 90 180 µA
I
=5mA
O
V
= 5.3 ± 1 V
I
f = 120 Hz 80 dB
f=1KHz 75
f = 10 KHz 60
V
Dropout Voltage IO= 200 mA 0.25 0.5 V
d
= 200 mA TJ=-40 to 125°C 0.7
I
O
V
Control Input Logic Low TJ= -40 to 125°C 0.8 V
IL
Control Input Logic High TJ= -40 to 125°C 2 V
V
IH
Control Input Current 10 µA
I
I
Output Bypass Capacitance ESR = 0.5 to 10 Ω IO=0to200mA
C
O
Control Flag Output Low VI-VO<V
V
FL
Control Flag Output High
I
FH
Leakage Current
T
= -40 to 125°C
J
power, IFL=6mA
I
= 200mA
O
CESAT
VI> 3.62 V, VOH=15V 10 µA
210 µF
0.5 V
3/13
L4987 SERIES
ELECTRICAL CHARACTERISTICS OF L4987CPT33 (refer to the test circuits, VI=6.3V,IO=5mA,
T
= 25°C, CI=0.1µF,CO= 2.2 µF unless otherwise specified)
J
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
Output Voltage IO= 200 mA VI= 6.3 V 2.88 3.3 3.066 V
O
= 200 mA VI= 6.3 V TJ=-40 to 125°C 2.76 3.432
I
O
Operating Input Voltage IO= 200 mA 4 18 V
V
I
Output Current Limit 250 A
I
out
∆V
∆V
SVR Supply Voltage Rejection I
Line Regulation VI= 4.6 to 18 V IO= 0.5 mA 2.4 14 mV
O
Load Regulation VI= 4.4 V IO= 0.5 to 200 mA 3 20 mV
O
Quiescent Current
I
d
ON MODE
OFF MODE V
VI= 4.6 to 18 V IO= 0 mA 0.7 1 mA
= 4.6 to 18 V IO= 200 mA 1.5 6
V
I
= 12 V 90 180 µA
I
=5mA
O
V
= 5.6 ± 1 V
I
f = 120 Hz 80 dB
f=1KHz 75
f = 10 KHz 60
V
Dropout Voltage IO= 200 mA 0.25 0.5 V
d
= 200 mA TJ=-40 to 125°C 0.7
I
O
V
Control Input Logic Low TJ= -40 to 125°C 0.8 V
IL
Control Input Logic High TJ= -40 to 125°C 2 V
V
IH
Control Input Current 10 µA
I
I
Output Bypass Capacitance ESR = 0.5 to 10 Ω IO=0to200mA
C
O
Control Flag Output Low VI-VO<V
V
FL
Control Flag Output High
I
FH
Leakage Current
T
= -40 to 125°C
J
power, IFL=6mA
I
= 200mA
O
CESAT
VI>4V, VOH=15V 10 µA
210 µF
0.5 V
4/13
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