Datasheet L4987CPT87, L4987CPT120, L4987CPT50, L4987CPT30 Datasheet (SGS Thomson Microelectronics)

L4987



VERY LOW DROP VOLTAGE REGULATORS

WITH INHIBIT AND DROPOUT CONTROLFLAG

■ VERYLOWDROPOUTVOLTAGE(0.25V

TYP.)

■ DROPOUTCONTROLFLAG

■ VERYLOW QUIESCENTCURRENT

(TYP.90 µA IN OFF MODE,500µAINON
MODE)

■ OUTPUT CURRENT UP TO200 mA

■ LOGIC-CONTROLLEDELECTRONIC

SHUTDOWN

■ OUTPUT VOLTAGESOF 3V,5V 8.7V 12V

■ INTERNAL CURRENTAND THERMAL LIMIT

■ ONLY2.2µF FORSTABILITY

■ AVAILABLEIN ± 2%SELECTIONAT25

■ SUPPLYVOLTAGEREJECTION:70 dB (TYP.)

DESCRIPTION

The L4987 is a very low drop regulatoravailable
in PPAK. The very low drop-voltage(0.5V Max at
200 mA) and the very low quiescent currentmake
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

o

C

SERIES

PPAK

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

October 1998

1/11

L4987 SERIES

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

V

DC Input Voltage 40 V

i

OutputCurrent Internally limited mA

I

o

PowerDissipation Internally limited mW

P

tot

Storage Temperature Range - 40 to 150

T

stg

OperatingJunctionTemperatureRange - 40 to 125

T

op

Absolute Maximum Rating are those values beyond wich damage to the device may occur. Functional operation under these conditions is
not implied.

THERMALDATA

Symbol Parameter DPAK/PPAK Unit

R

thj-cas e

R

thj-amb

Thermal Resistance Junction-case
Thermal Resistance Junction-ambient

8

100

CONNECTION DIAGRAM (top view)

o
o

o

C/W

o

C/W

C
C

ORDERING NUMBERS

L4987CPT30(*)
L4987CPT50(*)
L4987CPT87(*)
L4987CPT120(*)

(*) Available even in tape& reel

2/11

Type Output Voltage

3V
5V

8.7 V
12 V

L4987 SERIES

ELECTRICAL CHARACTERISTICS FOR L4987CPT30

= 5 mA, Tj=25oC, Ci= 0.1 µF, Co= 2.2 µF unless otherwisespecified)

I

OUT

(refer to the test circuits, V

=6V,

I

Symbol Parameter Test Conditions Min. Typ. Max. Unit

OutputVoltage Io=200 mA, Vi=6V

V

I

∆
∆V

o

OperatingInput Voltage Io=200 mA 3.62 18 V

V

i

OutputCurrentLimit 250 A

out

LineRegulation Vi= 4.3to 18 V, Io=0.5mA 2.4 14 mV

V

o

LoadRegulation Vi= 4.1V Io= 0.5to 200 mA 3 20 mV

o

Quiescent Current ON MODE

I

d

=200 mA, Vi= 6 V -40<TJ<125oC

I

o

= 4.3to 18 V Io=0mA

V

i

= 4.3to 18 V Io=200 mA

V

i

OFF MODE V

SVR Supply VoltageRejection

=5 mA Vi=5.3V±1V

I

o

f = 120Hz
f=1KHz
f = 10KHz

Dropout Voltage Io=200 mA

V

d

Control Input Logic Low -40< TJ< 125oC0.8V

V

il

Control Input Logic High -40 < TJ< 125oC2 V

V

ih

Control Input Current 10

I

i

OutputBypassCapacitance

C

O

=200 mA -40< TJ<125oC

I

o

ESR = 0.5 to 10ΩI

-40 < T

Control Flag OutputLow Vi-Vo<V

V

fl

Control Flag OutputHigh

I

fh

I

=200 mA

o

Vi> 3.62V Voh=15V 10 µA

i

< 125oC

J

power, Ifl=6mA

cesat

2.94

2.88

=12V 90 180

= 0 to 200mA

o

210

33.06

3.12

0.7

1.5

1
6

80
75
60

0.25 0.5

0.7

0.5 V

Leakage Current

V
V

mA
mA

A

µ

dB
dB
dB

V
V

A

µ

F

µ

3/11

L4987 SERIES

ELECTRICAL CHARACTERISTICS FOR L4987CPT50

= 5mA, Tj=25oC, Ci= 0.1 µF, Co= 2.2 µF unless otherwise specified)

I

OUT

(refer to the test circuits, V

=8V,

I

Symbol Parameter Test Conditions Min. Typ. Max. Unit

OutputVoltage Io=200 mA, Vi=8V

V

I

∆
∆V

o

OperatingInput Voltage Io=200 mA 5.7 18 V

V

i

OutputCurrentLimit 250 A

out

LineRegulation Vi= 6.3to 18 V, Io=0.5mA 3 20 mV

V

o

LoadRegulation Vi= 3.6V Io= 0.5to 200 mA 3 20 mV

o

Quiescent Current ON MODE

I

d

=200 mA, Vi= 8 V -40<TJ<125oC

I

o

= 6.3to 18 V Io=0mA

V

i

= 6.3to 18 V Io=200 mA

V

i

OFF MODE V

SVR Supply VoltageRejection

=5 mA Vi=7.3V±1V

I

o

f = 120Hz
f=1KHz
f = 10KHz

Dropout Voltage Io=200 mA

V

d

Control Input Logic Low -40< TJ< 125oC0.8V

V

il

Control Input Logic High -40 < TJ< 125oC2 V

V

ih

Control Input Current 10

I

i

OutputBypassCapacitance

C

O

=200 mA -40< TJ<125oC

I

o

ESR = 0.5 to 10ΩI

-40 < T

Control Flag OutputLow Vi-Vo<V

V

fl

Control Flag OutputHigh

I

fh

I

=200 mA

o

Vi> 5.85V Voh=15V 10 µA

i

< 125oC

J

power, Ifl=6mA

cesat

4.9

4.8

=12V 90 180

= 0 to 200mA

o

210

55.1

5.2

0.7

1.5

1
6

76
71
58

0.3 0.5

0.7

0.5 V

Leakage Current

V
V

mA
mA

A

µ

dB
dB
dB

V
V

A

µ

F

µ

4/11

L4987 SERIES

ELECTRICAL CHARACTERISTICS FOR L4987CPT87

= 5mA, Tj=25oC, Ci= 0.1 µF, Co= 2.2 µF unless otherwise specified)

I

OUT

(refer to the test circuits, V

= 11.7V,

I

Symbol Parameter Test Conditions Min. Typ. Max. Unit

OutputVoltage Io=200 mA, Vi=11.7V

V

I

∆
∆V

o

OperatingInput Voltage Io=200 mA 9.55 18 V

V

i

OutputCurrentLimit 250 A

out

LineRegulation Vi=10to18V, Io=0.5mA 4 24 mV

V

o

LoadRegulation Vi=10V Io= 0.5to 200 mA 3 20 mV

o

Quiescent Current ON MODE

I

d

=200 mA, Vi=11.7V -40<TJ<125oC

I

o

=10to18V Io=0mA

V

i

=10to18V Io= 200mA

V

i

OFF MODE V

SVR Supply VoltageRejection

=5 mA Vi=11V±1V

I

o

f = 120Hz
f=1KHz
f = 10KHz

Dropout Voltage Io=200 mA

V

d

Control Input Logic Low -40< TJ< 125oC0.8V

V

il

Control Input Logic High -40 < TJ< 125oC2 V

V

ih

Control Input Current 10

I

i

OutputBypassCapacitance

C

O

=200 mA -40< TJ<125oC

I

o

ESR = 0.5 to 10ΩI

-40 < T

Control Flag OutputLow Vi-Vo<V

V

fl

Control Flag OutputHigh

I

fh

I

=200 mA

o

Vi> 9.55V Voh=15V 10 µA

i

< 125oC

J

power, Ifl=6mA

cesat

8.526

8.35

=12V 90 180

= 0 to 200mA

o

210

8.7 8.874

9.05

0.5
3

1
6

71
68
55

0.3 0.5

0.7

0.5 V

Leakage Current

V
V

mA
mA

A

µ

dB
dB
dB

V
V

A

µ

F

µ

5/11

L4987 SERIES

ELECTRICAL CHARACTERISTICS FOR L4987CPT120

= 5mA, Tj=25oC, Ci= 0.1 µF, Co= 2.2 µF unless otherwise specified)

I

OUT

(refer to the test circuits, V

=15V,

I

Symbol Parameter Test Conditions Min. Typ. Max. Unit

OutputVoltage Io=200 mA, Vi=15V

V

I

∆
∆V

o

OperatingInput Voltage Io=200 mA 12.75 18 V

V

i

OutputCurrentLimit 250 A

out

LineRegulation Vi= 13.5to 18 V, Io= 0.5mA 5 30 mV

V

o

LoadRegulation Vi= 13.5V Io= 0.5to 200 mA 3 20 mV

o

Quiescent Current ON MODE

I

d

=200 mA, Vi=15V -40<TJ<125oC

I

o

= 13.5to 18 V Io=0mA

V

i

= 13.5to 18 V Io=200mA

V

i

OFF MODE V

SVR Supply VoltageRejection

=5 mA Vi=14.5 V±1V

I

o

f = 120Hz
f=1KHz
f = 10KHz

Dropout Voltage Io=200 mA

V

d

Control Input Logic Low -40< TJ< 125oC0.8V

V

il

Control Input Logic High -40 < TJ< 125oC2 V

V

ih

Control Input Current 10

I

i

OutputBypassCapacitance

C

O

=200 mA -40< TJ<125oC

I

o

ESR = 0.5 to 10ΩI

-40 < T

Control Flag OutputLow Vi-Vo<V

V

fl

Control Flag OutputHigh

I

fh

I

=200 mA

o

Vi> 12.75V Voh=15V 10 µA

i

< 125oC

J

power, Ifl=6mA

cesat

11.76

11.52

=12V 90 180

= 0 to 200mA

o

210

12 8.874

9.05

0.5
3

1
6

67
64
51

0.3 0.5

0.7

0.5 V

Leakage Current

V
V

mA
mA

A

µ

dB
dB
dB

V
V

A

µ

F

µ

6/11

L4987 SERIES

TYPICALPERFORMANCECHARACTERISTICS

Outputand Flag Voltage vs InputVoltage

Outputand Flag Voltage vs InputVoltage

(unless otherwisespecified T

OutputVoltage vs Input Voltage

OutputVoltage vs Input Voltage

=25oC, CIN=C

J

OUT

=1µF)

Outputand Flag Voltage vs InputVoltage

OutputVoltage vs Input Voltage

7/11

L4987 SERIES

APPLICATION HINT OF L4987CPT30
Howto usethe control flag

The flag produces a logic ”low” whenever the
output fall out out of regulation. An ”out of
regulationconditioncan result from:

1) Low Input Voltage (V

≤ V

IN

OUT+VDROP

)

2) CurentLimiting

3) Thermal Limiting
Figure 1 to 2 show the typical behaviour of the

output voltage and the control flag versus the
input voltageand thetemperatre.No hysteresis is
implemented;so the responseof V

OUT

and V

FLAG

are the same either when the VINramps up or
down.

The control flag is an open collector which
requires an externalpull-up resistor. This may be
connected to the regulator output (Figure 3) or
someother supply voltage(Figure 4).

Using the regulator output prevents an invalid
”high” on theflag which occurs if it is pulled up to
an external voltage while the regulator input
voltageis reducedbelow about 2V (Figue 5).

Concerning the pull-up resistor its value must be
properlychosen as suggestedbelow. When ”low”
as it is possible to see in figure 6 the control flag
voltageis:

V

FLAG(LOW)=VCE

= 0.5 = V

SUPPLY-RPULLxIFL

V

SUPPLY

while I

0.5V ≥ V
The minimum value of R

is chosen by design and, thus is known,
must be at maximum 10mA. Then

FL

SUPPLY-RPULL

x 10mA

, is, so, determined

PULL

by the following equation:
R

PULL(min)

≥ V

SUPPLY

Regarding the maximum value of R

0.5

-

mA

10

note that

PULL

its value depends of the type of logic used
(CMOS,TTL etc.), the transistor leackagecurrent
and the presence or not of a load on V

FLAG

.

The following example shows how to determine
the R

max in the case of CMOS logic, no

PULL

load and 10µA (for L4978 it is the maximum value

) of control flag leakage current.

of I

FH

Becaauseof CMOS logic:

2

≥

V

FLAG(HIGH)

3

V

SUPPLY

But:
V

FLAG(HIGH)=VSUPPLY-RPULLxIFH

2

≥

V

SUPPLY

3

so, the maximum value is determined by the
followingequation:

1

V

SUPPLY

R

PULL(MAX)

3

≤

10

A

Figure1:

8/11

Outputand Flag Voltage vs Input

Figure2:

FlagVoltage vs Input

L4987 SERIES

Figure3:

TestCircuit

Figure4: Test Circuit

Figure5:

Outputand Flag Voltage vs Input

Figure6:

EquivalentOutput Circuit

9/11

L4987 SERIES

PPAK MECHANICAL DATA

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 1 0.031 0.039
L4 0.6 1 0.023 0.039

mm inch

10/11

0078180/B

L4987 SERIES

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11/11