Datasheet L4987 Datasheet (ST)

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

L4987 SERIES

ELECTRICAL CHARACTERISTICS OF L4987CPT50 (refer to the test circuits, VI=8V,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= 8 V 4.9 5 5.1 V

O

= 200 mA VI=8V TJ=-40 to 125°C 4.8 5.2

I

O

Operating Input Voltage IO= 200 mA 5.7 18 V

V

I

Output Current Limit 250 A

I

out

∆V
∆V

SVR Supply Voltage Rejection I

Line Regulation VI= 6.3 to 18 V IO= 0.5 mA 3 20 mV

O

Load Regulation VI= 3.6 V IO= 0.5 to 200 mA 3 20 mV

O

Quiescent Current

I

d

ON MODE
OFF MODE V

VI= 6.3 to 18 V IO= 0 mA 0.7 1 mA

= 6.3 to 18 V IO= 200 mA 1.5 6

V

I

= 12 V 90 180 µA

I

=5mA

O

V

= 7.3 ± 1 V

I

f = 120 Hz 76 dB
f=1KHz 71
f = 10 KHz 58

V

Dropout Voltage IO= 200 mA 0.3 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> 5.85 V, VOH=15V 10 µA

210 µF

0.5 V

5/13

L4987 SERIES

ELECTRICAL CHARACTERISTICS OF L4987CPT87 (refer to the test circuits, VI= 11.7V, 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= 11.7 V 8.526 8.7 8.874 V

O

= 200 mA VI= 11.7 V TJ=-40 to 125°C 8.35 9.05

I

O

Operating Input Voltage IO= 200 mA 9.55 18 V

V

I

Output Current Limit 250 A

I

out

∆V
∆V

SVR Supply Voltage Rejection I

Line Regulation VI=10to18V IO= 0.5 mA 4 24 mV

O

Load Regulation VI=10V IO= 0.5 to 200 mA 3 20 mV

O

Quiescent Current

I

d

ON MODE
OFF MODE V

VI=10to18V IO= 0 mA 0.5 1 mA

=10to18V IO= 200 mA 3 6

V

I

= 12 V 90 180 µA

I

=5mA

O

V

=11±1V

I

f = 120 Hz 71 dB
f=1KHz 68
f = 10 KHz 55

V

Dropout Voltage IO= 200 mA 0.3 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> 9.55 V, VOH=15V 10 µA

210 µF

0.5 V

6/13

L4987 SERIES

ELECTRICAL CHARACTERISTICS OF L4987CPT120 (refer to the test circuits, VI= 15V, 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= 15 V 11.76 12 8.874 V

O

= 200 mA VI=15V TJ=-40 to 125°C 11.52 9.05

I

O

Operating Input Voltage IO= 200 mA 12.75 18 V

V

I

Output Current Limit 250 A

I

out

∆V
∆V

SVR Supply Voltage Rejection I

Line Regulation VI= 13.5 to 18 V IO= 0.5 mA 5 30 mV

O

Load Regulation VI= 13.5 V IO= 0.5 to 200 mA 3 20 mV

O

Quiescent Current

I

d

ON MODE
OFF MODE V

VI= 13.5 to 18 V IO= 0 mA 0.5 1 mA

= 13.5 to 18 V IO= 200 mA 3 6

V

I

= 12 V 90 180 µA

I

=5mA

O

V

= 14.5 ± 1 V

I

f = 120 Hz 67 dB
f=1KHz 64
f = 10 KHz 51

V

Dropout Voltage IO= 200 mA 0.3 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> 9.55 V, VOH=15V 10 µA

210 µF

0.5 V

7/13

L4987 SERIES

TYPICAL PERFORM ANCE CHARACTERISTICS (Unless otherwise specified TJ= 25°C, CI=CO=0.1 µF)
Figure1 : Output and Flag Voltage vs Input

Voltage

Figure2 : Output Voltage vs Input Voltage

Figure4 : Output Voltage vs Input Voltage

Figure5 : Output and Flag Voltage vs Input

Voltage

Figure3 : Output and Flag Voltage vs Input
Voltage

8/13

Figure6 : Output Voltage vs Input Voltage

L4987 SERIES

APPLICATION HINT OF L4987CPT30

HOW TO USE THE CONTROL FLAG
The flag produces a logic "low" whenever the output drops out of regulation. An "out of regulation
condition can result from:

1) Low Input Voltage (V

2) Current Limiting

3) Thermal Limiting
Figure 1 to 2 show the t y pical behavior of the output voltage and the control flag versus the input vo lta ge
and the temperature. No hysteresis is implemented; so the respons e of V
either when the V

IN

The control flag is an open collector which requires an external pull-up resistor. This may be connected to
the regulator out put (Figure 9) or some other supply voltage (F igure 10).
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 (Figure 12).
Concerning the pull-up resistor its value must be properly chosen as sugges ted below. When "low" as it
is possible to see in figure 6 the control flag voltage is:
V

FLAG(LOW)=VCE

V

SUPPLY

is chosen by design and, thus is known, while IFLmust be at maximum 10mA.

Then 0.5V ≥ V

=0.5=V

SUPPLY-RPULL

The minimum value of R
R

PULL(min)

≥ V

SUPPLY

Regarding the maximum value of R
etc.), the trans istor leakage current and the presence or not of a load on V
The f ollowing example shows how t o determine the R
10µA (f or L4978 it is the maximum value of I
Because of CMOS logic:
V

FLAG(HIGH)

≥ 2/3 V
But:
V

FLAG(HIGH)=VSUPPLY-RPULLxIFH

so, the maximum value is determined by the following equation:
R

PULL(MAX)

≤ (1/3 V

≤ V

IN

OUT+VDROP

ramps up or down.

SUPPLY-RPULLxIFL

x 10mA

, is, so, dete rmined by the following equation:

PULL

-0.5/10mA

PULL

SUPPLY

SUPPLY

)/10 A

)

OUT

and V

are the same

FLAG

note that itsvalue depends of the type of logic used (CM OS, TTL

.

FLAG

≥ 2/3 V

max in the case of CMOS logic, no load and

) of control flag leakage current.

FH

SUPPLY

PULL

Figure7 : Output and Flag Voltage vs Input Figure8 : Flag Voltage vs Input

9/13

L4987 SERIES

Figure9 : Test Circuit

Figure10 : Test Circuit

Figure11 : Equivalent Output Circuit Figure12 : Output and Flag Voltage vs Input

10/13

PPAK MECHANICAL DATA

L4987 SERIES

DIM.

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 0.031
L4 0.6 1 0.023 0.039

mm. inch

0078180-B

11/13

L4987 SERIES

Tape & Reel DPAK-PPAK MECHANICAL DATA

DIM.

MIN. TYP MAX. MIN. TYP. MAX.

A 180 7.086

C 12.8 13.0 13.2 0.504 0.512 0.519

D 20.2 0.795

N 60 2.362

T 14.4 0.567
Ao 6.80 6.90 7.00 0.268 0.272 0.2.76
Bo 10.40 10.50 10.60 0.409 0.413 0.417
Ko 2.55 2.65 2.75 0.100 0.104 0.105
Po 3.9 4.0 4.1 0.153 0.157 0.161

P 7.9 8.0 8.1 0.311 0.315 0.319

mm. inch

12/13

L4987 SERIES

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