Datasheet LD2982BM28R, LD2982BM25R, LD2982BM18R, LD2982AM50R, LD2982AM47R Datasheet (SGS Thomson Microelectronics)

LD2982

SERIES

VERY LOW DROP AND LOW NOISE VOLTAGE REGULATOR

WITH INHIBIT FUNCTION, LOW ESR CAP. COMPATIBLE

■ VERY LOW DRO PO UT VOLTAGE (120mV

AT 50mA AND 7mV AT 1mA LOAD)

■ VERY LOW QUIESCENT CURRENT (375µA

TYP. AT 50mA LOAD AND 75µAAT1mA)

■ OUTPUT CURRENT UP TO 50mA

■ LOGIC C ONTROLLED ELECTRONIC

SHUTDOWN

■ OUTPUT VOLTAGEOF1.5,1.8,2.5, 2.8,2.85,

3, 3.1, 3.2, 3.3, 3.5, 3.6, 3.8, 4, 4.7, 5V

■ INTERNAL CURRENT AND THERM AL LIM IT

■ AVAILABLE IN ± 1% TOLLERANCE (AT25°C,

AVERSION)

■ SUPPLY VOLTAGE REJECTION: 45dB (TYP)

■ ONLY 1µF FOR STABILITY

■ LOW OUTPUT NOISE VOLTAGE 30µVrms

■ SMALLEST PACKAGE SOT23-5L

■ TEMPERATURE RANGE: -40°C TO 125°C

DESCRIPTION

The LD2982 is a 50mA fixed output voltage
regulator. The ultra low drop voltage and the low
quiescent current make them particularly suitable
for low noise, low power appl icati ons , and in
battery powered systems. In sleep mode
quiescent current is less than 1µA when INHIBIT

pin ispulled low. Shutdown LogicControl Function
is available onpi n 3 (TTL compatible). This means
that when t he device is used as local regulator, it
is possible to put a part of the board in standby,
decreasing the total powerconsumption.
An external capacitor C
between bypass pin and GND reduce the noise
to 30µV rms.
Typical applicat ion are in cellular phone, palmtop/
laptop computer, personal digital assistant (PDA),
personal stereo, ca mcorder and camera.

SOT23-5L

BYP

=10nF connected

SCHEMATIC DIAGRAM

1/13July 2003

LD2982 SERIES

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

V

V

INH

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 SOT23-5L Unit

R

thj-case

CONNECTION DIAGRAM (top view) PIN DESCRIPTION

DC Input Voltage

I

INHIBIT Input Voltage
Output Current

O

Power Dissipation

tot

Storage Temperature Range

stg

Operating Junction Temperature Range

op

Thermal Resistance Junction-case

SOT23-5L

16 V

16 V
Internally limited
Internally limited

-65 to +150 °C

-40 to +125 °C

81 °C/W

Pin N° Symbol Name and Function

1 IN Input Port
2 GND Ground Pin
3 INHIBIT Control switch ON/OFF. Inhibit is not

internally pulled-up; it cannot be left
floating. Disable the device when
connected to GND or to a positive
voltage less than 0.18V

4 Bypass Bypass Pin: Capacitor to be

connected to GND in order to
improve the thermal noise
performances.

5 OUT Output Port

ORDERING CODES

A VERSION B VERSION OUTPUT VOLTAGES

LD2982AM15R LD2982BM15R 1.5V
LD2982AM18R LD2982BM18R 1.8V
LD2982AM25R LD2982BM25R 2.5V
LD2982AM28R LD2982BM28R 2.8V

LD2982AM285R LD2982BM285R 2.85V

LD2982AM30R LD2982BM30R 3.0V
LD2982AM31R LD2982BM31R 3.1V
LD2982AM32R LD2982BM32R 3.2V
LD2982AM33R LD2982BM33R 3.3V
LD2982AM35R LD2982BM35R 3.5V
LD2982AM36R LD2982BM36R 3.6V
LD2982AM38R LD2982BM38R 3.8V
LD2982AM40R LD2982BM40R 4.0V
LD2982AM47R LD2982BM47R 4.7V
LD2982AM50R LD2982BM50R 5.0V

2/13

LD2982 SE RIE S

ELECTRICAL CHARACTERISTICS FOR LD2982A (TJ= 25°C, VI=VO+1V, IO=1mA, V

C

=1µF, CO=1µF, unless otherwise specified)

I

SHDN

=2V,

Symbol Parameter Test Conditions Min. Typ. Max. Unit

V

Operating Input Voltage 2.5 16 V

Op

Output Voltage VI= 2.5V 1.485 1.5 1.515 V

V

O

= 1 to 50mA 1.477 1.523 V

I

O

I

=1to50mA TJ= -40 to 125°C

O

V

Output Voltage VI= 2.8V 1.782 1.8 1.818 V

O

= 1 to 50mA 1.773 1.827 V

I

O

I

=1to50mA TJ= -40 to 125°C

O

V

Output Voltage VI= 3.5V 2.475 2.5 2.525 V

O

= 1 to 50mA 2.462 2.537 V

I

O

I

=1to50mA TJ= -40 to 125°C

O

V

Output Voltage VI= 3.8V 2.772 2.8 2.828 V

O

= 1 to 50mA 2.758 2.842 V

I

O

I

=1to50mA TJ= -40 to 125°C

O

V

Output Voltage VI= 3.85V 2.821 2.85 2.879 V

O

= 1 to 50mA 2.807 2.893 V

I

O

IO=1to50mA TJ= -40 to 125°C

V

Output Voltage VI= 4.0V 2.970 3.0 3.030 V

O

= 1 to 50mA 2.955 3.045 V

I

O

I

=1to50mA TJ= -40 to 125°C

O

V

Output Voltage VI= 4.1V 3.069 3.1 3.131 V

O

= 1 to 50mA 3.053 3.146 V

I

O

I

=1to50mA TJ= -40 to 125°C

O

V

Output Voltage VI= 4.2V 3.168 3.2 3.232 V

O

= 1 to 50mA 3.152 3.248 V

I

O

I

=1to50mA TJ= -40 to 125°C

O

V

Output Voltage VI= 4.3V 3.267 3.3 3.333 V

O

= 1 to 50mA 3.250 3.349 V

I

O

=1to50mA TJ= -40 to 125°C

I

O

V

Output Voltage VI= 4.5V 3.465 3.5 3.535 V

O

= 1 to 50mA 3.447 3.552 V

I

O

I

=1to50mA TJ= -40 to 125°C

O

V

Output Voltage VI= 4.6V 3.564 3.6 3.636 V

O

= 1 to 50mA 3.546 3.654 V

I

O

I

=1to50mA TJ= -40 to 125°C

O

V

Output Voltage VI= 4.8V 3.762 3.8 3.838 V

O

= 1 to 50mA 3.743 3.857 V

I

O

I

=1to50mA TJ= -40 to 125°C

O

V

Output Voltage VI= 5.0V 3.96 4 4.04 V

O

= 1 to 50mA 3.94 4.06 V

I

O

I

=1to50mA TJ= -40 to 125°C

O

1.470 1.530 V

1.764 1.836 V

2.45 2.55 V

2.744 2.856 V

2.793 2.907 V

2.94 3.06 V

3.038 3.162 V

3.136 3.264 V

3.234 3.366 V

3.43 3.57 V

3.528 3.672 V

3.724 3.876 V

3.92 4.08 V

3/13

LD2982 SERIES

Symbol Parameter Test Conditions Min. Typ. Max. Unit

V

Output Voltage VI= 5.7V 4.653 4.7 4.747 V

O

= 1 to 50mA 4.629 4.77 V

I

O

I

=1to50mA TJ= -40 to 125°C

O

V

Output Voltage VI= 6.0V 4.95 5 5.05 V

O

= 1 to 50mA 4.925 5.075 V

I

O

I

=1to50mA TJ= -40 to 125°C

O

I

Short Circuit Current RL= 0 150 mA

SC

/∆VILine Regulation VI=VO+1V to 16V, IO= 1mA 0.003 0.014 %/V

∆V

O

VI=VO+1V to 16V, IO= 1mA

= -40 to 125°C

T

J

V

Dropout Voltage IO=0 1 3 mV

d

I

=0 TJ= -40 to 125°C

O

I

=1mA 7 10 mV

O

I

=1mA TJ= -40 to 125°C

O

I

= 10mA 40 60 mV

O

I

= 10mA TJ= -40 to 125°C

O

I

= 50mA 120 150 mV

O

I

= 50mA TJ= -40 to 125°C

O

I

Quiescent Current IO= 0 80 100 µA

d

I

=0 TJ= -40 to 125°C

O

I

= 1mA 100 150 µA

O

I

=1mA TJ= -40 to 125°C

O

I

= 10mA 200 300 µA

O

I

= 10mA TJ= -40 to 125°C

O

I

= 50mA 600 900 µA

O

I

= 50mA TJ= -40 to 125°C

O

SVR Supply Voltage Rejection C

V

Control Input Logic Low

IL

Control Input Logic High

V

IH

I

Control Input Current

iNH

OFF MODE V
OFF MODE V

T

= -40 to 125°C

J

= 0.01µFCO=10µF f = 1KHz 45 dB

BYP

T

= -40 to 125°C

J

T

= -40 to 125°C

J

T

= -40 to 125°C V

J

T

= -40 to 125°C V

J

<0.18V 0 µA

INH

<0.18V

INH

=5V

SHDN

=0V

SHDN

eN Output Noise Voltage B= 300Hz to 50KHz

= 0.01µFC

C

BYP

=10µF

O

4.606 4.794 V

4.9 5.1 V

0.032 %/V

5mV

15 mV

90 mV

225 mV

150 µA

200 µA

400 µA

1200 µA

1 µA

0.15 V

2V

515µA
0-1µA

30 µV

I
I

4/13

LD2982 SE RIE S

ELECTRICAL CHARACTERISTICS FOR LD2982B (TJ= 25°C, VI=VO+1V, IO=1mA, V

C

=1µF, CO=1µF, unless otherwise specified)

I

SHDN

=2V,

Symbol Parameter Test Conditions Min. Typ. Max. Unit

V

Operating Input Voltage 2.5 16 V

Op

Output Voltage VI= 2.5V 1.477 1.5 1.523 V

V

O

= 1 to 50mA 1.470 1.530 V

I

O

I

=1to50mA TJ= -40 to 125°C

O

V

Output Voltage VI= 2.8V 1.773 1.8 1.827 V

O

= 1 to 50mA 1.764 1.836 V

I

O

I

=1to50mA TJ= -40 to 125°C

O

V

Output Voltage VI= 3.5V 2.462 2.5 2.537 V

O

= 1 to 50mA 2.45 2.55 V

I

O

I

=1to50mA TJ= -40 to 125°C

O

V

Output Voltage VI= 3.8V 2.758 2.8 2.842 V

O

= 1 to 50mA 2.744 2.856 V

I

O

I

=1to50mA TJ= -40 to 125°C

O

V

Output Voltage VI= 3.85V 2.807 2.85 2.893 V

O

= 1 to 50mA 2.793 2.907 V

I

O

IO=1to50mA TJ= -40 to 125°C

V

Output Voltage VI= 4.0V 2.955 3.0 3.045 V

O

= 1 to 50mA 2.94 3.06 V

I

O

I

=1to50mA TJ= -40 to 125°C

O

V

Output Voltage VI= 4.1V 3.053 3.1 3.146 V

O

= 1 to 50mA 3.038 3.162 V

I

O

I

=1to50mA TJ= -40 to 125°C

O

V

Output Voltage VI= 4.2V 3.152 3.2 3.248 V

O

= 1 to 50mA 3.136 3.264 V

I

O

I

=1to50mA TJ= -40 to 125°C

O

V

Output Voltage VI= 4.3V 3.250 3.3 3.349 V

O

= 1 to 50mA 3.234 3.366 V

I

O

=1to50mA TJ= -40 to 125°C

I

O

V

Output Voltage VI= 4.5V 3.447 3.5 3.552 V

O

= 1 to 50mA 3.430 3.370 V

I

O

I

=1to50mA TJ= -40 to 125°C

O

V

Output Voltage VI= 4.6V 3.546 3.6 3.654 V

O

= 1 to 50mA 3.528 3.672 V

I

O

I

=1to50mA TJ= -40 to 125°C

O

V

Output Voltage VI= 4.8V 3.743 3.8 3.857 V

O

= 1 to 50mA 3.724 3.876 V

I

O

I

=1to50mA TJ= -40 to 125°C

O

V

Output Voltage VI= 5.0V 3.94 4 4.06 V

O

= 1 to 50mA 3.92 4.08 V

I

O

I

=1to50mA TJ= -40 to 125°C

O

1.447 1.553 V

1.737 1.863 V

2.412 2.587 V

2.702 2.898 V

2.750 2.950 V

2.895 3.105 V

2.991 3.208 V

3.088 3.312 V

3.184 3.415 V

3.377 3.662 V

3.474 3.726 V

3.667 3.933 V

3.86 4.14 V

5/13

LD2982 SERIES

Symbol Parameter Test Conditions Min. Typ. Max. Unit

V

Output Voltage VI= 5.7V 4.629 4.7 4.77 V

O

= 1 to 50mA 4.606 4.794 V

I

O

I

=1to50mA TJ= -40 to 125°C

O

V

Output Voltage VI= 6.0V 4.925 5 5.075 V

O

= 1 to 50mA 4.9 5.1 V

I

O

I

=1to50mA TJ= -40 to 125°C

O

I

Short Circuit Current RL= 0 400 mA

SC

/∆VILine Regulation VI=VO+1V to 16V, IO= 1mA 0.003 0.014 %/V

∆V

O

VI=VO+1V to 16V, IO= 1mA

= -40 to 125°C

T

J

V

Dropout Voltage IO=0 1 3 mV

d

I

=0 TJ= -40 to 125°C

O

I

=1mA 7 10 mV

O

I

=1mA TJ= -40 to 125°C

O

I

= 10mA 40 60 mV

O

I

= 10mA TJ= -40 to 125°C

O

I

= 50mA 120 150 mV

O

I

= 50mA TJ= -40 to 125°C

O

I

Quiescent Current IO= 0 80 100 µA

d

I

=0 TJ= -40 to 125°C

O

I

= 1mA 100 150 µA

O

I

=1mA TJ= -40 to 125°C

O

I

= 10mA 200 300 µA

O

I

= 10mA TJ= -40 to 125°C

O

I

= 50mA 600 900 µA

O

I

= 50mA TJ= -40 to 125°C

O

SVR Supply Voltage Rejection C

V

Control Input Logic Low

IL

Control Input Logic High

V

IH

I

Control Input Current

iNH

OFF MODE V
OFF MODE V

T

= -40 to 125°C

J

= 0.01µFCO=10µF f = 1KHz 45 dB

BYP

T

= -40 to 125°C

J

T

= -40 to 125°C

J

T

= -40 to 125°C V

J

T

= -40 to 125°C V

J

<0.18V 0 µA

INH

<0.18V

INH

=5V

SHDN

=0V

SHDN

eN Output Noise Voltage B= 300Hz to 50KHz

= 0.01µFC

C

BYP

=10µF

O

4.535 4.864 V

4.825 5.175 V

0.032 %/V

5mV

15 mV

90 mV

225 mV

150 µA

200 µA

400 µA

1200 µA

1 µA

0.15 V

2V

515µA
0-1µA

30 µV

I
I

6/13

LD2982 SE RIE S

TYPICAL CHARACTERISTICS(unless otherwise specified TJ= 25°C,CI=1µF, CO=2.2µF, C
Figure1 : Output Voltage vs Temperature

Figure2 : Dropout V oltage vs Temperature

Figure4 : Quiescent Current vs Load Current

Figure5 : Quiescent Current vs Temperature

BYP

=100nF)

Figure3 : Dropout V oltage vs Output Current

Figure6 : Supply Voltage Rejection vs

Temperature

7/13

LD2982 SERIES

V

I

C

C

t

t

V

I

C

C

Figure7 : Supply Voltage Rejection vs Output
Current

Figure8 : Supply Voltage Rejection vs Output
Current

Figure10 : Supply Voltage Re jection vs
Frequency

Figure11 : Line T r ans ient

Figure9 : Supply Voltage Rejection vs

Frequency

8/13

=2.5V,

O

=50mA,no

O

,

I

=4.7µF,

O

Figure12 : Line Transient

=2.5V,

O

=50mA,no

O

,

=4.7µF,tr=tf=1µs

I

O

=

=2ns

r

f

Figure13 : Load Transient Figure14 : Load Transient

V

I

C

C

V

I

C

C

LD2982 SE RIE S

=2.5V,

O

=0to 50mA,no

O

,

=10µF,ts=tf=2ns

I

O

=2.5V,

O

=0to 50mA,no

O

,

=4.7µF,ts=tf=2ns

I

O

EXTERNAL CAPACITORS

Like any low-dropout re gulator, the LD2982 requires external c apacitors for regulator stability. This
capacitor must be selected to meet the requirements of m inimum capacitance and equivalent series
resistance. We suggest to solder input and output c apacitors as close as possible to the relative pins.

INPUT CAPACITOR

An input capacitor whose value is 1µF is required with the LD2982 (amount of capacitance c an be
increased without limit). This capacitor must bel ocated a distance ofnot more than 0.5" from the input pin
of the device andreturned to a clean analog ground. Any good qualityceramic, tantalum or film capacitors
can be used for this capacitor.

OUTPUT CAPACITOR

The LD2982 isdesigned specificallyto work with ceramicoutput capacitors.It may also bepossible to use
Tan talum capacitors, but these are not as attractive for reasons of size and cost. B y the way, the output
capacitor must meet both the requi re ment for minimum amount of c apacitance and E.S.R. (equivalent
series resistance) v alue. Due to the different loop gain, the stability improv es for higher output versions
and so the sugg ested minimum output capacitor value, if low E.S.R. ceramic type is used, is 1µF for
output voltages equal or major than 3.8V, 2.2µF for V

going from 1.8 to 3.3V, an d 3. 3µF for the other

O

versions. However, if an output c apacitor lower than the suggested one is used, it's possible to make
stable the regulator adding a resistor in series to the capacitor.

IMPORTANT:
The outp ut capacitor must maintain its ESR in the st able region over the full operating temperat ure to

assure stability. Also, capacitor tolerance and variation with temperature must be considered to assure
the minimum amount of capacitance is provided at all times. This capacitor should be located not more
than 0.5" from the output pin of the device and returned to a clean analog grou nd.

INHIBIT INPUT OPERATION

The inhibit pin can be used to turn OFF the regulator when pulled low, so drastically reducing the current
consumption down to less than 1µA. When the inhibit feature is not us ed, this p in must be tied to V

to

I

keep the regulator output ON at all times. To assure proper operation, the signal source used to drive the
inhibit pin must be able to swing ab ove and below the specified thresholds listed in t he electrical
characteristics section under V

.Anyslewratecanbeusedtodrivetheinhibit.

IHVIL

9/13

LD2982 SERIES

REVERSE CURRENT

The power transistor used inthe LD2982 has notan inherent diode connected betweenthe regulator input
and output. If the output is forced above the input, no current will flow from the output to the input across
the series pas s transistor. When a V
flows to the GND across the two feedback resistors. This current typical value is 160µA. R
resistors are implanted type; typical values are, respectively, 42.6 KΩ and 51.150 KΩ.

Figure15 : Reverse Current Test Ci rcuit

voltage is applied on the output, t he reve rse current measured

REV

and R

1

2

10/13

LD2982 SE RIE S

SOT23-5L MECHANICAL DATA

mm. mils

DIM.

MIN. TYP MAX. MIN. TYP. MAX.

A 0.90 1.45 35.4 57.1

A1 0.00 0.10 0.0 3.9

A2 0.90 1.30 35.4 51.2

b 0.35 0.50 13.7 19.7

C 0.09 0.20 3.5 7.8

D 2.80 3.00 110.2 118.1

E 1.50 1.75 59.0 68.8

e0.95 37.4

H 2.60 3.00 102.3 118.1

L 0.10 0.60 3.9 23.6

.

7049676C

11/13

LD2982 SERIES

Tape & Reel SOT23-xL 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 3.13 3.23 3.33 0.123 0.127 0.131
Bo 3.07 3.17 3.27 0.120 0.124 0.128
Ko 1.27 1.37 1.47 0.050 0.054 0.0.58
Po 3.9 4.0 4.1 0.153 0.157 0.161

P 3.9 4.0 4.1 0.153 0.157 0.161

mm. inch

12/13

LD2982 SE RIE S

Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the
consequences of use o f suc h inf ormat ion n or f or an y infr ingeme nt of paten ts or oth er ri gh ts of third part ies whic h may resul t f rom
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mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information
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systems without express written approval of STMicroelectronics.

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13/13