Advanced Monolithic Systems LP2950CS-3.3, LP2950CS-3.0, LP2950CP-3.3, LP2950CN-3.3, LP2950CN-3.0 Datasheet

Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone [phone] Fax [phone]

Advanced LP2950/LP2951
Monolithic 100mA LOW DROPOUT VOLTAGE REGULATOR
Systems

FEATURES APPLICATIONS

•• 5V, 3.3V, and 3V Versions at 100mA Output Current •• Battery Powered Systems

•• High Accuracy Output Voltage •• Portable Consumer Equipment

•• Extremely Low Quiescent Current •• Cordless Telephones

•• Low Dropout Voltage •• Portable (Notebook) Computers

•• Extremely Tight Load and Line Regulation •• Portable Instrumentation

•• Very Low Temperature Coefficient •• Radio Control Systems

•• Current and Thermal Limiting •• Automotive Electronics

•• Needs Minimum Capacitance (1µµF) for Stability •• Avionics

•• Unregulated DC Positive Transients 60V •• Low-Power Voltage Reference

ADDITIONAL FEATURES (LP2951 ONLY)

•• 1.24V to 29V Programmable Output

•• Error Flag Warning of Voltage Output Dropout

•• Logic Controlled Electronic Shutdown

GENERAL DESCRIPTION

The LP2950 and LP2951 are micropower voltage regulators ideally suited for use in battery-powered systems. These devices
feature very low quiescent current (typ.75µA), and very low dropout voltage (typ.45mV at light loads and 380mV at 100mA)
thus prolonging battery life. The quiescent current increases only slightly in dropout. The LP2950/LP2951 has positive
transient protection up to 60V and can survive unregulated input transient up to 20V below ground.
The LP2950 and LP2951 were designed to include a tight initial tolerance (typ. 0.5%), excellent load and line regulation (typ.

0.05%), and a very low output voltage temperature coefficient, making these devices useful as a low-power voltage reference.
The LP2950 is offered in the 3-pin TO-92 package. LP2951 is available in 8-pin plastic SOIC and DIP packages and offers
three major additional system features. An error flag output warns of a low output voltage, often due to failing batteries on
input. The LP2951 also features the logic-compatible shutdown input which enables the regulator to be switched on and off.
The LP2951 device may be pin-strapped for a 5V, 3.3V, or 3V output, or programmed from 1.24V to 29V with an external
pair of resistors.

ORDERING INFORMATION PIN CONNECTION

PACKAGE TYPE

OPERATING

TO-92

8 LEAD PDIP

8 LEAD SOIC

TEMP. RANGE

LP2950ACN-X

LP2951ACP-X

LP2951ACS-X

IND.

LP2950CN-X

LP2951CP-X

LP2951CS-X

IND

X = 3.3V, or 3V

8L SOIC/ 8L PDIP

1
2

8

4

3

7

5

6 V

TAP

ERROR

FEEDBACK

OUTPUT

SENSE

SHUTDOWN

INPUT

GROUND

Top View

TO-92

OUTPUT

INPUT

GND

Bottom View

Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone [phone] Fax [phone]

LP2950/LP2951

ABSOLUTE MAXIMUM RATINGS (Note 1)

Input Supply Voltage -0.3 to +30V Wave

4 seconds, 260°C

SHUTDOWN Input Voltage, Infrared

4 seconds, 240°C

Error Comparator Output Vapor Phase

4 seconds, 219°C

Voltage,(Note 9) ESD TBD
FEEDBACK Input Voltage -1.5 to +30V
(Note 9) (Note 10)

OPERATING RATINGS (Note 1)

Power Dissipation Internally Limited
Junction Temperature

+150°C

Max. Input Supply Voltage 30V

Storage Temperature

-65°C to +150°C

Junction Temperature Range

Soldering Dwell Time, Temperature (TJ) (Note 8)

LP2950AC-XX, LP2950C-XX
LP2951AC-XX, LP2951C-XX

-40°C to +125°C

ELECTRICAL CHARACTERISTICS at V

s

=Vout+1V, Ta=25°C, unless otherwise noted.

Parameter Conditions

(Note 2)

LP2950AC
LP2951AC

Min. Typ. Max.

LP2950C
LP2951C

Min. Typ. Max.

Units

3 V Versions (Note 16)

Output Voltage

TJ = 25°C (Note 3)

-25°C ≤TJ ≤85°C
Full Operating Temperature Range

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

Output Voltage

100 µA ≤IL ≤100 mA
TJ ≤T

JMAX

2.958

3.0

3.042 2.928

3.0

3.072

V

3.3 V Versions (Note 16)
Output Voltage

TJ = 25°C (Note 3)

-25°C ≤TJ ≤85°C
Full Operating Temperature Range

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

Output Voltage

100 µA ≤IL ≤100 mA
TJ ≤T

JMAX

3.254

3.3

3.346 3.221

3.3

3.379

V

5 V Versions (Note 16)
Output Voltage

TJ = 25°C (Note 3)

-25°C ≤TJ ≤85°C
Full Operating Temperature Range

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

Output Voltage

100 µA ≤IL ≤100 mA
TJ ≤T

JMAX

4.925

5.0

5.075 4.88

5.0

5.12

V

All Voltage Options

Output Voltage
Temperature Coefficient (Note 12) (Note 4)

20 50

ppm/°C

Line Regulation (Note 14)

6V ≤Vin ≤30V (Note 15)

0.03 0.1 0.04 0.2 %

Load Regulation (Note 14)

100 µA ≤IL ≤ 100 mA

0.04 0.1 0.1 0.2 %

Dropout Voltage
(Note 5)

IL = 100µ A
IL = 100 mA

50

380

80

450

50

380

80

450

mV
mV

Ground Current

IL = 100 µA
IL = 100 mA

75

8

120

12

75

8

120

12

µA

mA

Current Limit

V

out

= 0 160 200 160 200 mA

Thermal Regulation (Note 13) 0.05 0.2 0.05 0.2 %/W

Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone [phone] Fax [phone]

LP2950/LP2951

ELECTRICAL CHARACTERISTICS (Note 2) (Continued)

PARAMETER CONDITIONS

(Note 2)

LP2950AC
LP2951AC

Min. Typ. Max.

LP2950C
LP2951C

Min. Typ. Max.

Units

Output Noise,
10Hz to 100KHz

CL = 1µF
CL = 200 µF
CL = 13.3 µF
(Bypass = 0.01 µF pins 7 to

1(LP2951))

430
160
100

430
160
100

µV rms
µV rms
µV rms

8-Pin Versions only LP2951AC LP2951C

Reference Voltage 1.22 1.235 1.25 1.21 1.235 1.26 V
Reference Voltage Over Temperature (Note 7)

1.19 1.27 1.185 1.285

V

Feedback Pin Bias Current 40 60 40 60 nA

Reference Voltage Temperature
Coefficient

( Note 12 )

20 50 ppm/°C

Feedback Pin Bias Current
Temperature Coefficient

0.1 0.1 nA/°C

Error Comparator

Output Leakage Current

V

OH

= 30V 0.01 1 0.01 1

µA

Output Low Voltage

Vin = 4.5V
IOL = 400µA

150 250 150 250 mV

Upper Threshold Voltage

(Note 6) 40 60 40 60 mV

Lower Threshold Voltage

(Note 6) 75 95 75 95 mV

Hysteresis

(Note 6) 15 15 mV

Shutdown Input

Input logic Voltage

Low (Regulator ON)
High (Regulator OFF)

2

1.3

0.7
2

1.3

0.7

V
V

Shutdown Pin Input Current
(Note 3)

Vs = 2.4V
Vs = 30V

30
450

50
600

30
450

50
600

µA
µA

Regulator Output Current in
Shutdown (Note 3)

(Note 11) 3 10 3 10

µA

Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which operation of the
device is guaranteed. Operating Ratings do not imply guaranteed performance limits. For guaranteed performance limits and associated test conditions, see the
Electrical Characteristics tables.
Note 2: Unless otherwise specified all limits guaranteed for V

IN

= ( V

ONOM

+1)V, IL = 100 µA and CL = 1 µF for 5V versions and 2.2µF for 3V and 3.3V versions.

Limits appearing in boldface type apply over the entire junction temperature range for operation. Limits appearing in normal type apply for TA = TJ = 25°C
Additional conditions for the 8-pin versions are FEEDBACK tied to V

TAP

, OUTPUT tied to SENSE and V

SHUTDOWN

≤ 0.8V.

Note 3: Guaranteed and 100% production tested.
Note 4: Guaranteed but not 100% production tested. These limits are not used to calculate outgoing AQL levels.
Note 5: Dropout voltage is defined as the input to output differential at which the output voltage drops 100 mV 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 into account.
Note 6: Comparator thresholds are expressed in terms of a voltage differential at the feedback terminal below the nominal reference voltage measured at
V

IN

= ( V

ONOM

+1)V. To express these thresholds in terms of output voltage change, multiply by the error amplifier gain = Vout/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 = 384 mV. Thresholds 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 7: V

ref ≤Vout

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

JMAX

.

Note 8: The junction-to-ambient thermal resistance are as follows:180°C/W and 160°C/W for the TO-92 (N) package with 0.40 inch and 0.25 inch leads to the
printed circuit board (PCB) respectively, 105°C/W for the molded plastic DIP (P) and 160°C/W for the molded plastic SO-8 (S). The above thermal resistances for
the N, S and P packages apply when the package is soldered directly to the PCB.

Note 9: May exceed input supply voltage.
Note 10: When used in dual-supply systems where the output terminal sees loads returned to a negative supply, the output voltage should be diode-clamped to

ground.
Note 11: V

shutdown

≥ 2V, Vin ≤ 30V, V

out

=0, Feedback pin tied to 5V

TAP

.

Note 12: Output or reference voltage temperature coefficients defined as the worst case voltage change divided by the total temperature range.

Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone [phone] Fax [phone]

LP2950/LP2951

Note 13: Thermal regulation is defined as the change in output voltage at a time T after a change in power dissipation is applied, excluding load or line regulation

effects. Specifications are for a 50mA load pulse at VIN =30V (1.25W pulse) for T =10 ms.
Note 14: 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 15: Line regulation for the LP2951 is tested at 150°C for IL = 1 mA. For IL = 100 µA and TJ = 125°C, line regulation is guaranteed by design to 0.2%. See
typical performance characteristics for line regulation versus temperature and load current.
Note 16: All LP2950 devices have the nominal output voltage coded as the last two digits of the part number. In the LP2951 products, the 3.0V and 3.3V versions
are designated by the last two digits, but the 5V version is denoted with no code of the part number.

BLOCK DIAGRAM AND TYPICAL APPLICATIONS

LP2950-XX LP2951-XX

INPUT

OUTPUT

GROUND

ERROR
AMPLIFIER

1.23V
REFERENCE

UNREGULATED DC

V

OUT

IL≤ 100mA

SEE APPLICATION

HINTS

+

+

+

+

-

INPUT OUTPUT

GROUND

ERROR
AMPLIFIER

1.23V
REFERENCE

UNREGULATED DC

V

OUT

I

L

≤

100mA

SEE APPLICATION

HINTS

+

+

+

+

-

FEED­BACK

SHUT-

DOWN

SENSE

V

TAP

ERROR

TO CMOS
OR TTL

+

-

+

330k

Ω

4

5

6

2

187

3

FROM
CMOS

OR TTL

50mV

ERROR DETECTION COMPARATOR

Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone [phone] Fax [phone]

LP2950/LP2951

TYPICAL PERFORMANCE CHARACTERISTICS

0

40

100

60

160

0 1 2 3 4 5 6 7 8

INPUT VOLTAGE (V)

Quiescent Current

QUIESCENT CURRENT (µA)

125

250

Input Current

25

50

75

100

150

175

200

225

INPUT VOLTAGE (V)

INPUT CURRENT (µA)

5V OUTPUT

-75 0 25 50 75 100 125

5.06

5.0

150

OUTPUT VOLTAGE (V)

Temperature Drift of 3
Representative Units

TEMPERATURE (° C)

5.04

4.98

4.94

-50 -25

0.1 1 10 100
LOAD CURRENT (mA)

GROUND CURRENT (mA)

0.01

0.1

1

10

Quiescent Current

Dropout Characteristics

INPUT VOLTAGE (V)

OUTPUT VOLTAGE (V)

RL= 50 kΩ

0

60

120

Input Current

10

20

30

50

70

80

90

100

INPUT VOLTAGE (V)

INPUT CURRENT (mA)

-75

0 25 50 75 100 125

120

90

150

QUIESCENT CURRENT (

µ

A)

Quiescent Current

TEMPERATURE (° C)

100

70

60

-50 -25

IL= 100µA

-75

0 25 50 75 100 12510150

QUIESCENT CURRENT (mA)

Quiescent Current

TEMPERATURE (° C)

9

8

7

-50 -25

IL= 100mA

50

80

110

20

80

140
120

0

2

5

3

8

0 1 2 3 4 5 6 7 8

INPUT VOLTAGE (V)

Quiescent Current

QUIESCENT CURRENT (µA)

1

4

7
6

0

1 2 3 4 5 6 1 2 3 4 5 6 7 8 9 100

0

1

2

3

4

5

6

0

1 2 3 4 5 6 7 8 9 100

40

110

5.02

4.96

5V OUTPUT

5V OUTPUT5V OUTPUT 5V OUTPUT

5V OUTPUT

5V OUTPUT

5V OUTPUT

IL= 1 mA

IL= 100mA

RL= 50Ω

RL= 50 kΩ

IL= 0

VIN= 6V

VIN= 6V

RL= 50Ω

0.2%

RL= ∞