Calogic LLC LP2951CS-3, LP2951CP-5, LP2951CP-3.3, LP2951CS-5, LP2951CS-3.3 Datasheet

100mA Low Dropout

Voltage Regulators

LP2950 / LP2951

FEATURES

••

5V, 3.3V, and 3.0V Vers io ns at 100mA Output

••

Ver y Low Q ui e s cent Current

••

Low Dropout Voltage

••

Extremely Tig h t Load and Line Regul ati on

••

Ver y Low Tempe ratur e Coef fi ci ent

••

Current and Thermal Limiting

••

Needs Only 1µF for Stabi lit y

LP2951 Versions Only

••

Error Flag Warns of Output Dropout

••

Logic-Controlled Electronic Shutdown

••

Outpu t Progr am ma bl e from 1. 24 to 2 9V

APPLICATIONS

••

Battery Pow er ed Syst em s

••

Cordless Telephones

••

Radio Control Systems

••

Portable / Palm T op / Noteboo k Comput ers

••

Portable Consumer Equipment

••

Portable I nst ru me nt atio n

••

Avionics

••

SMPS Post-Regula tor

••

V ol tage Ref er en c e

••

Automot i ve El ect r oni cs

PRODUCT DESCRIPTION

The Calogic LP2950 and LP2951 are low power voltage
regulators. These devices are an excellent choice for use in
battery-powered applications such as cordless telephones,
radio control systems, and portable computers. The LP2950
and LP2951 features very low quiescent current and very low
dropout volt age (Typ. 50mV at light load and 380mV at 100mA).
This includes a tight initial tolerance of 0.5% typ., extremely
good load and line regula tion 0.05% typ. and very low output
temperature coefficient, making the LP2950/LP2951 useful
as a low-power voltage reference.

The error flag output feature is used as power-on reset for
warning of a low output voltage, due to falling voltage input of
batteries. Another feature is the logic-compatible shutdown
input which enables the regulator to be switched on and off.
The LP2950 is offered in a 3-pin TO-92 package compatible
with other 5V , 3.0V, 3.3V regulators. The LP2951 is also av ailabl e
in 8-pin plastic and SO- 8.

The regulator output voltage may be pin-strapped for 5V, 3V
or 3.3 volts or programmed from 1.24 volt to 29 volts with an
external pair of resistors. Use of AS’s design, processing and
testing techniques make our LP2950 and LP2951 superior
over similar product s.

ORDERING INFORMATION
P ART PACKAGE TEMPERATURE RANG E

LP2950ACN-X TO-92 (3-Pin) IND.
LP2950CN-X TO-92 (3-Pin) IND.
LP2951ACP-X Plastic DIP (8-Pin) IND.
LP2951CP-X Plastic DIP (8-Pin) IND.
LP2951ACS-X Plastic SOIC (8-Pin) IND.
LP2951CS-X Plastic SOIC (8-Pin) IND.

X = 3.0V, 3.3V or 5.0V

CORPORATION

PIN CONNECTIONS

1D-20

123

1. OUTPUT

2. GROUND

3. INPUT

TO-92

BOTTOM VIEW

GROUND

1
2
3

8
7
6

4 5 ERROR

LP2951

1D-19

8-PIN SURFACE MOUNT

5V OR 3.3V TAP

FEEDBACK

INPUT

SHUTDOWN

SENSE

OUTPUT

TOP VIEW

CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 9453 9, Telephone: [phone], FAX: [phone]

ABSOLUTE MAXIMUM RATINGS

Power Dissipation . . . . . . . . . . . . . . . . . . . . . Internally Limited

Lead Temp. (Soldering, 5 Seconds) . . . . . . . . . . . . . . . 260

o

C

Storage Tem per atur e Ra nge. . . . . . . . . . . . . . . -65 to +150

o

C
Operating Junct ion Te mper at ure Ra nge

LP2951. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55 to +150

o

C
LP2950AC/LP2950C

LP2951AC/LP2951C. . . . . . . . . . . . . . . . . . . -40 to +125

o

C

Input Supply Vo ltag e . . . . . . . . . . . . . . . . . . . . . . -0.3 to +30V

Feedback Input Voltage. . . . . . . . . . . . . . . . . . . . -1.5 to +30V

Shutdown Input Voltage. . . . . . . . . . . . . . . . . . . . -0.3 to +30V

Error Comparator Output. . . . . . . . . . . . . . . . . . . -0.3 to +30V

ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2KV Min

LP2950 / LP2951

CORPORATION

CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 9453 9, Telephone: [phone], FAX: [phone]

ELECTRICAL CHARACTERISTICS: V

S

= 15V, TA = 25oC, unless otherwise specified .

PARAMETER

LP2951 LP2950AC / LP2951AC LP2950C / LP2951C

UNITS

CONDITIONS

(Note 2)

MIN TYP MAX MIN TYP MAX MIN TYP MAX

3V VERSIONS

Output Voltage

2.985

2.964

3.0 3.015

3.036

2.985

2.970

2.964

3.0

3.0

3.0

3.015

3.030

3.036

2.970

2.955

2.940

3.0

3.0

3.0

3.030

3.045

3.060

V
V
V

TJ = 25oC

-25

o

C ≤ TJ ≤ 85oC

Full Operating T emperature

Output Voltage 2.955 3.0 3.045 2.958 3.0 3.042 2.928 3.0 3.072 V

100µA ≤ I

L

≤ 100mA

T

J

≤T

JMAX

3.3V VERSIONS

Output Voltage

3.284

3.260

3.3 3.317

3.340

3.284

3.267

3.260

3.3

3.3

3.3

3.317

3.333

3.340

3.267

3.251

3.234

3.3

3.3

3.3

3.333

3.350

3.366

V
V
V

T

J

= 25oC

-25

o

C ≤ TJ ≤ 85oC

Full Operating T emperature

Output Voltage 3.251 3.3 3.350 3.254 3.3 3.346 3.221 3.3 3.379 V

100µA ≤ I

L

≤ 100m A

T

J

≤T

JMAX

5V VERSIONS

Output Voltage

4.975

4.94

5.0 5.025

5.06

4.975

4.95

4.94

5.0

5.0

5.0

5.025

5.050

5.06

4.95

4.925

4.90

5.0

5.0

5.0

5.05

5.075

5.10

V
V
V

T

J

= 25oC

-25

o

C ≤ TJ ≤ 85oC

Full Operating T emperature

Output Voltage 4.925 5.0 5.075 4.93 5.0 5.07 4.88 5.0 5.12 V

100µA ≤ I

L

≤ 100m A

T

J

≤ T

JMAX

ALL VOLTAGE OPTIONS

Output Voltage
T emperature Coefficient

20 120 20 50 ppm/

o

C (Note 1)

Line Regulation (Note 3) 0.03 0.1 0.03 0.1 0.04 0.2 % 6V ≤ V

IN

≤ 30V (Note 4)

Load Regulation (Note 3) 0.04 0.1 0.04 0.1 0.1 0.2 % 100µA ≤ I

L

≤ 100m A

Dropout Voltage
(Note 5)

50

38080450

50

38080450

50

38080450mVmV

I

L

= 100µA

I

L

= 100m A

Ground Current

1508170

12

1508170

12

1508170

12

µAmAI

L

= 100µA

I

L

= 100m A

Current Limit 130 200 130 200 130 200 mA V

OUT

= 0

Thermal Regulation 0.05 0.2 0.05 0.2 0.05 0.2 %/W

Output Noise,
10Hz to 100KHz

430
160
100

430
160
100

430
160
100

µVrms
µVrms
µVrms

C

L

= 1µF

C

L

= 200µF

C

L

= 13.3µF

(Bypass = 0.01µF pins 7 to 1 (LP2951))

8-PIN VERSIONS ONLY LP2951 LP2951AC LP2951C

Reference Voltage 1.22 1.235 1.25 1.22 1.235 1.25 1.21 1.235 1.26 V
Reference Voltage 1.19 1.27 1.19 1.27 1.185 1.285 V Over Temperature (Note 6)
Feedback Pin Bias Current 40 60 40 60 40 60 nA
Reference Voltage

T emperature Coefficient

20 20 50 ppm/

o

C (Note 7)

Feedback Pin Bias Current
T emperature Coefficient

0.1 0.1 0.1 nA/

o

C

LP2950 / LP2951

CORPORATION

BLOCK DIAGRAM

ERROR DETECTION
COMPARATOR

1D-21

1µF

REFERENCE

1.23V

UNREGULATED DC

ERROR
AMPLIFIER

60mV

+

+

TO CMOS OR
TTL

330kΩ

FROM
CMOS

OR TTL

+

+

5V @ 100mA
MAX

60kΩ

LP2950 AND LP2951 BLOCK DIAGRAM

180kΩ

817

SENSE

6

2

4

5

5V TAP

ERROR

GROUND

INPUT OUTPUTFEEDBACK

SHUTDOWN

3

–

+
–

+

CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 9453 9, Telephone: [phone], FAX: [phone]

ELECTRICAL CHARACTERISTIC S (continued)

PARAMETER

LP2951 LP2950AC / LP2951AC LP2950C / LP2951C

UNITS

CONDITIONS

(Note 2)

MIN TYP MAX MIN TYP MAX MIN TYP MAX

ERROR COMPARATOR

Output Leakage Current 0.01 1 0.01 1 0.01 1 µAV

OH

= 30V

Output Low Voltage 150 250 150 250 150 250 mV V

IN

= 4.5V, IOL = 400µA
Upper Threshold Voltage 40 60 40 60 40 60 mV (Note 7)
Lower Threshold Voltage 75 95 75 95 75 95 mV (Note 7)
Hysteresis 15 15 15 mV (Note 7)

SHUTDOWN INPUT

Inp ut Logic Voltage

2

1.3 0.6
2

1.3 0.7
2

1.3 0.7 V
V

Low (Regulato r ON)
High (Regulator OFF)

Shutdown Pin
Input Current

30

67550800

30

67550800

30

67550800

µAµAV

S

= 2.4V

V

S

= 30V

Regulator Output Current
in Shutdown

310 310 310µA (Note 9)

Note 1: Output or reference voltage temperature coefficients defined as the worst case voltage change divided by the total temperature range.
Note 2: Unless otherwise specified all limits guaranteed for T

J

= 25oC, VIN = 6V, IL=100µA and CL = 1µF. Additional conditions for the 8-pin

versions are feedback tied to 5V tap and output tied to output Sense (V

OUT

= 5V) and V

SHUTDOWN

≤ 0.8V.

Note 3: Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage due to
heating effects are covered under the specification for thermal regulation.

Note 4: Line regulation for the LP2951 is tested at 150

o

C for IL = 1mA. For IL = 100µA and TJ = 125oC, line regulatio n is guara nte ed by desig n to

0.2%. See typical performance characteristics for line regulation versus temperature and load current.
Note 5: Dropout voltage is defined as the input to output differential at which the output voltage drops 100mV below its nominal value measured

at 1V differential at very low values of programmed output voltage, the minimum input supply voltage of 2V (2.3V over temperature) must be
taken input account.

Note 6: V

REF

≤ V

OUT

≤ (VIN - 1V), 2.3 ≤ VIN ≤ 30V, 100µA ≤ IL ≤ 100mA, TJ ≤ T

JMAX

.

Note 7: Comparator thresholds are expressed in terms of a voltage differential at the feedback terminal below the nominal reference voltage
measured at 6V input. To express these thre sh old s in terms of output vo lta ge chan ge , mu ltip l y by the erro r amp lifi er g ai n = V

OUT/VREF

=
(R1+R2)/R2. For example, at a programmed output voltage of 5V, the error output is guaranteed to go low when the output drops by 95 mV x
5V/1.235 = 384mV. Thresho lds remain constant as a percent of V

OUT

as V

OUT

is varied, with the dropout warning occurring at typically 5% below

nominal, 7.5% guaranteed.
Note 8: V

SHUTDOWN

≥ 2V, VIN ≤ 30V, V

OUT

= 0, Feedback pin tied to 5V Tap.

Note 9: All typical values are not guaranteed.