calogic LP2950, LP2951 User Manual

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CORPORATION

100mA Low Dropout

Voltage Regulators

LP2950 / LP2951

FEATURES

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

••

Ver y Low Quiescent Cur rent

••

Low Dropout Voltage

••

Extremely Ti gh t Load and Line Regul ati on

••

Ver y Low Tempe ratur e Coef f ici 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 t o 29V

••

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 als o availabl 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

PIN CONNECTIONS

8-PIN SURFACE MOUNT

INPUT

OUTPUT

SENSE

SHUTDOWN

GROUND

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

1
2

LP2951

3
4 5 ERROR

TOP VIEW

8

FEEDBACK

7

5V OR 3.3V TAP

6

1D-19

TO-92

123

BOTTOM VIEW

1. OUTPUT

2. GROUND

3. INPUT

1D-20

LP2950 / LP2951

ABSOLUTE MAXIMUM RATINGS

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

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

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

Operating Ju nction Te mper at ure Ra n ge

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

LP2950AC/LP2950C

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

o
o

o

o

CORPORATION

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

C
C

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

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

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

C

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

C

ELECTRICAL CHARACTERISTICS: V

PARAMETER

LP2951 LP2950AC / LP2951AC LP2950C / LP2951C

MIN TYP MAX MIN TYP MAX MIN TYP MAX

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

S

UNITS

CONDITIONS

(Note 2)

3V VERSIONS

Output Voltage

2.985

2.964

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

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

TJ = 25oC
V
V

o

-25

C ≤ TJ ≤ 85oC

Full Operating T emperature

100µA ≤ I

T

J

≤T

L

JMAX

≤ 100mA

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

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

V
V
V

= 25oC

T

J

o

-25

C ≤ TJ ≤ 85oC

Full Operating T emperature

100µA ≤ I

T

J

≤T

JMAX

≤ 100m A

L

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

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

V
V
V

= 25oC

T

J

o

-25

C ≤ TJ ≤ 85oC

Full Operating T emperature

100µA ≤ I

T

J

≤ T

JMAX

≤ 100m A

L

ALL VOLTAGE OPTIONS

Output Voltage
T emperature Coefficient

20 120 20 50 ppm/

Line Regulation (Note 3) 0.03 0.1 0.03 0.1 0.04 0.2 % 6V ≤ V
Load Regulation (Note 3) 0.04 0.1 0.04 0.1 0.1 0.2 % 100µA ≤ I
Dropout Voltage

(Note 5)
Ground Current

50

38080450
1508170

12

50

38080450
1508170

12

50

38080450
1508170

12

Current Limit 130 200 130 200 130 200 mA V

o

C (Note 1)

mVmVI

µAmAI

= 100µA

L

I

= 100mA

L

= 100µA

L

I

= 100mA

L

= 0

OUT

≤ 30V (Note 4)

IN

≤ 100m A

L

Thermal Regulation 0.05 0.2 0.05 0.2 0.05 0.2 %/W

C

Output Noise,
10Hz to 100KHz

430
160
100

430
160
100

430
160
100

µVrms
µVrms
µVrms

= 1µF

L

C

= 200µF

L

C

= 13.3µF

L

(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
Feedback Pin Bias Current

T emperature Coefficient

20 20 50 ppm/

0.1 0.1 0.1 nA/

o

C (Note 7)

o

C

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

LP2950 / LP2951

CORPORATION

ELECTRICAL CHARACTERISTIC S (continued)

PARAMETER

LP2951 LP2950AC / LP2951AC LP2950C / LP2951C

MIN TYP MAX MIN TYP MAX MIN TYP MAX

UNITS

ERROR COMPARATOR

Output Leakage Current 0.01 1 0.01 1 0.01 1 µAV
Output Low Voltage 150 250 150 250 150 250 mV V
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

Input Logic Voltage
Shutdown Pin

Input Current
Regulator Output Current

in Shutdown

1.3 0.6

2

30

67550800

310 310 310µA (Note 9)

2

1.3 0.7

30

67550800

1.3 0.7 V

2

30

67550800

V

µAµAV

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

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

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

J

= 5V) and V

OUT

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.

o

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

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

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

OUT

JMAX

.

≤ V

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 thresholds in term s of outp ut vo lta ge chan ge , mu ltip l y by the erro r amp lifier gain = V
(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 95mV x
5V/1.235 = 384mV. Thresho lds remain consta nt as a percent of V

OUT

as V

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

OUT

nominal, 7.5% guaranteed.
Note 8: V

SHUTDOWN

≥ 2V, VIN ≤ 30V, V

= 0, Feedback pin tied to 5V Tap.

OUT

Note 9: All typical values are not guaranteed.

CONDITIONS

(Note 2)

= 30V

OH

= 4.5V, IOL = 400µA

IN

Low (Regulato r ON)

High (Regulator OFF)

= 2.4V

S

V

= 30V

S

OUT/VREF

=

BLOCK DIAGRAM

UNREGULATED DC

5V @ 100mA
MAX

+

1µF

TO CMOS OR
TTL

330kΩ

1D-21

FROM
CMOS

OR TTL

+

3

SHUTDOWN

60mV

LP2950 AND LP2951 BLOCK DIAGRAM

+

1.23V

+

REFERENCE

817

INPUT OUTPUTFEEDBACK

+
–

ERROR
AMPLIFIER

+

ERROR DETECTION

–

COMPARATOR

180kΩ

60kΩ

2

SENSE

6

5V TAP

5

ERROR

4

GROUND

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