Semiconductor LP2950, LP2951, NCV2951 User manual

Voltage Regulator - Low

Power Low, Dropout

100 mA

LP2950, LP2951, NCV2951

The LP2950 and LP2951 are micropower voltage regulators that are specifically designed to maintain proper regulation with an extremely low input−to−output voltage differential. These devices feature a very low quiescent bias current of 75 mA and are capable of supplying output currents in excess of 100 mA. Internal current and thermal limiting protection is provided.

The LP2951 has three additional features. The first is the Error Output that can be used to signal external circuitry of an out of regulation condition, or as a microprocessor power−on reset. The second feature allows the output voltage to be preset to 5.0 V, 3.3 V or

3.0 V output (depending on the version) or programmed from 1.25 V to 29 V. It consists of a pinned out resistor divider along with direct access to the Error Amplifier feedback input. The third feature is a Shutdown input that allows a logic level signal to turn−off or turn−on the regulator output.

Due to the low input−to−output voltage differential and bias current specifications, these devices are ideally suited for battery powered computer, consumer, and industrial equipment where an extension of useful battery life is desirable. The LP2950 is available in the three pin case 29 and DPAK packages, and the LP2951 is available in the eight pin dual−in−line, SOIC−8 and Micro8 surface mount packages. The ‘A’ suffix devices feature an initial output voltage tolerance ±0.5%.

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TO−92

CASE 29−10

Pin: 1. Output

1

2

3

4

2

1

3

DPAK

CASE 369C

Heatsink surface (shown as terminal 4 in

case outline drawing) is connected to Pin 2.

1

2

3

BENT LEADSTRAIGHT LEAD

PIN CONNECTIONS

12 3

(Top View)

2. Ground

3. Input

Pin: 1. Input

2. Ground

3. Output

Features

• Low Quiescent Bias Current of 75 mA

• Low Input−to−Output Voltage Differential of 50 mV at 100 mA and

380 mV at 100 mA

• 5.0 V, 3.3 V or 3.0 V ±0.5% Allows Use as a Regulator or Reference

• Extremely Tight Line and Load Regulation

• Requires Only a 1.0 mF Output Capacitor for Stability

• Internal Current and Thermal Limiting

• NCV Prefix for Automotive and Other Applications Requiring

Unique Site and Control Change Requirements; AEC−Q100 Qualified and PPAP Capable

• These Devices are Pb−Free and RoHS Compliant

LP2951 Additional Features

• Error Output Signals an Out of Regulation Condition

• Output Programmable from 1.25 V to 29 V

• Logic Level Shutdown Input

(See Following Page for Device Information.)

8

1

8

1

Output

Sense

Shutdown

GND

ORDERING & MARKING INFORMATION

See detailed ordering and shipping information in the package dimensions section on pages 14 and 15 of this data sheet. See general marking information in the device marking section on page 17 of this data sheet.

SOIC−8

CASE 751

PDIP−8

CASE 626

Micro8E

CASE 846A

PIN CONNECTIONS

18

2

3

4

(Top View)

8

Input

7

Feedback

6

V

5

Error

O

1

Ta p

Output

April, 2021 − Rev. 32

1 Publication Order Number:

LP2950/D

LP2950, LP2951, NCV2951

DEVICE INFORMATION

Output Voltage

Package

TO−92 Suffix Z

DPAK Suffix DT

SOIC−8 − NCV2951ACD−3.3R2 NCV2951ACDR2 NCV2951CDR2 TA = −40° to +125°C

SOIC−8 Suffix D

Micro8 Suffix DM

DIP−8 Suffix N

LP2950Cx−xx / LP2951Cxx−xx 1% Output Voltage Precision at TA = 25°C LP2950ACx−xx / LP2951ACxx−xx 0.5% Output Voltage Precision at T

3.0 V 3.3 V 5.0 V Adjustable

LP2950CZ−3.0 LP2950ACZ−3.0

LP2950CDT−3.0 LP2950ACDT−3.0

LP2951CD−3.0 LP2951ACD−3.0

LP2951CDM−3.0 LP2951ACDM−3.0

LP2951CN−3.0 LP2951ACN−3.0

LP2950CZ−3.3 LP2950ACZ−3.3

LP2950CDT−3.3 LP2950ACDT−3.3

LP2951CD−3.3 LP2951ACD−3.3

LP2951CDM−3.3 LP2951ACDM−3.3

LP2951CN−3.3 LP2951ACN−3.3

LP2950CZ−5.0 LP2950ACZ−5.0

LP2950CDT−5.0 LP2950ACDT−5.0

LP2951CD LP2951ACD

LP2951CDM LP2951ACDM

LP2951CN LP2951ACN

= 25°C

A

Not Available

LP2951CD LP2951ACD

LP2951CDM LP2951ACDM

LP2951CN LP2951ACN

Operating Ambient

Temperature Range

TA = −40° to +125°C

Unregulated DC

Battery or

Unregulated DC

Battery or

Shutdown

From CMOS/TTL

Input

3

Input 8 Output

Amplifier

3

60 k

50 k

Error Amplifier

GND 2

Error

1.23 V

Reference

1.23 V

Reference

1

75 mV/

60 mV

Error Detection

182 k

60 k

Sense 2

182 k

60 k

Comparator

Output

1

LP2950CZ−5.0

5.0 V/100 mA

1.0 mF

Tap

V

O

6

7

Feedback

Error Output

5

LP2951CD or CN

5.0 V/100 mA

330 k

To CMOS/TTL

GND 4

This device contains 34 active transistors.

Figure 1. Representative Block Diagrams

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2

LP2950, LP2951, NCV2951

MAXIMUM RATINGS (T

Input Voltage V

Peak Transient Input Voltage (t < 300 ms) V

= 25°C, unless otherwise noted.)

A

Rating

Symbol Value Unit

CC

30 Vdc

32 Vdc

Power Dissipation and Thermal Characteristics

Maximum Power Dissipation P

D

Internally Limited W

Case 751(SOIC−8) D Suffix

Thermal Resistance, Junction−to−Ambient

Thermal Resistance, Junction−to−Case

R

q

JA

R

q

JC

180 °C/W

45 °C/W

Case 369A (DPAK) DT Suffix (Note 1)

Thermal Resistance, Junction−to−Ambient

Thermal Resistance, Junction−to−Case

R

q

JA

R

q

JC

92 °C/W

6.0 °C/W

Case 29 (TO−226AA/TO−92) Z Suffix

Thermal Resistance, Junction−to−Ambient

Thermal Resistance, Junction−to−Case

R

q

JA

R

q

JC

160 °C/W

83 °C/W

Case 626 N Suffix

Thermal Resistance, Junction−to−Ambient

R

q

JA

105 °C/W

Case 846A (Micro8) DM Suffix

Thermal Resistance, Junction−to−Ambient

R

Feedback Input Voltage V

Shutdown Input Voltage V

Error Comparator Output Voltage V

Operating Ambient Temperature Range T

Maximum Die Junction Temperature Range T

Storage Temperature Range T

q

stg

JA

fb

sd

err

A

J

240 °C/W

−1.5 to +30 Vdc

−0.3 to +30 Vdc

−40 to +125 °C

+150 °C

−65 to +150 °C

Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality should not be assumed, damage may occur and reliability may be affected.

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3

LP2950, LP2951, NCV2951

ELECTRICAL CHARACTERISTICS

(Vin = VO + 1.0 V, IO = 100 mA, CO = 1.0 mF, TA = 25°C [Note 3], unless otherwise noted.)

Characteristic

Output Voltage, 5.0 V Versions V

V

= 6.0 V, I

in

= 100 mA, T

O

= 25°C

A

LP2950C−5.0/LP2951C/NCV2951C* 4.950 5.000 5.050

LP2950AC−5.0/LP2951AC/NCV2951AC* 4.975 5.000 5.025

TA = − 40 to +125°C

LP2950C−5.0/LP2951C/NCV2951C* 4.900 − 5.100

LP2950AC−5.0/LP2951AC/NCV2951AC* 4.940 − 5.060

V

= 6.0 to 30 V, IO = 100 mA to 100 mA, TA = − 40 to +125°C

in

LP2950C−5.0/LP2951C/NCV2951C* 4.880 − 5.120

LP2950AC−5.0/LP2951AC/NCV2951AC* 4.925 − 5.075

Output Voltage, 3.3 V Versions V

V

in

= 4.3 V, I

= 100 mA, T

O

= 25°C

A

LP2950C−3.3/LP2951C−3.3 3.267 3.300 3.333

LP2950AC−3.3/LP2951AC−3.3/NCV2951AC−3.3* 3.284 3.300 3.317

T

= −40 to +125°C

A

LP2950C−3.3/LP2951C−3.3 3.234 − 3.366

LP2950AC−3.3/LP2951AC−3.3/NCV2951AC−3.3* 3.260 − 3.340

V

= 4.3 to 30 V, IO = 100 mA to 100 mA, T

in

= −40 to +125°C

A

LP2950C−3.3/LP2951C−3.3 3.221 − 3.379

LP2950AC−3.3/LP2951AC−3.3/NCV2951AC−3.3* 3.254 − 3.346

Output Voltage, 3.0 V Versions V

V

in

= 4.0 V, I

= 100 mA, T

O

= 25°C

A

LP2950C−3.0/LP2951C−3.0 2.970 3.000 3.030

LP2950AC−3.0/LP2951AC−3.0 2.985 3.000 3.015

TA = − 40 to +125°C

LP2950C−3.0/LP2951C−3.0 2.940 − 3.060

LP2950AC−3.0/LP2951AC−3.0 2.964 − 3.036

V

= 4.0 to 30 V, IO = 100 mA to 100 mA, TA = − 40 to +125°C

in

LP2950C−3.0/LP2951C−3.0 2.928 − 3.072

LP2950AC−3.0/LP2951AC−3.0 2.958 − 3.042

Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product performance may not be indicated by the Electrical Characteristics if operated under different conditions.

1. The Junction−to−Ambient Thermal Resistance is determined by PCB copper area per Figure 29.

2. This device series contains ESD protection and exceeds the following tests:

Human Body Model (HBM), 2000 V, Class 2, JESD22 A114−C Machine Model (MM), 200 V, Class B, JESD22 A115−A Charged Device Model (CDM), 2000 V, Class IV, JESD22 C101−C

3. Low duty pulse techniques are used during test to maintain junction temperature as close to ambient as possible.

4. V

5. Noise tests on the LP2951 are made with a 0.01 mF capacitor connected across Pins 7 and 1.

is the part number voltage option.

O(nom)

6. Latch−up Current Maximum Rating tested per JEDEC standard: JESD78

− Inputs Low: passing positive current 100 mA and negative current −100 mA

− Inputs High: passing positive current 100 mA and negative current −10 mA.

*NCV prefix is for automotive and other applications requiring site and change control.

Symbol Min Typ Max Unit

O

V

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4

LP2950, LP2951, NCV2951

ELECTRICAL CHARACTERISTICS (continued)

(V

= VO + 1.0 V, IO = 100 mA, CO = 1.0 mF, TA = 25°C [Note 9], unless otherwise noted.)

in

Characteristic

Line Regulation (Vin = V

+1.0 V to 30 V) (Note 10) Reg

O(nom)

LP2950C−XX/LP2951C/LP2951C−XX/NCV2951C* − 0.08 0.20 LP2950AC−XX/LP2951AC/LP2951AC−XX/NCV2951AC* − 0.04 0.10

Load Regulation (IO = 100 mA to 100 mA)

LP2950C−XX/LP2951C/LP2951C−XX/NCV2951C* − 0.13 0.20 LP2950AC−XX/LP2951AC/LP2951AC−XX/NCV2951AC* − 0.05 0.10

Dropout Voltage V

IO = 100 mA IO = 100 mA − 350 450

Supply Bias Current I

IO = 100 mA IO = 100 mA − 4.0 12 mA

Dropout Supply Bias Current (V

I

= 100 mA) (Note 10)

O

= V

in

O(nom)

− 0.5 V,

Current Limit (VO Shorted to Ground) I

Thermal Regulation Reg

Output Noise Voltage (10 Hz to 100 kHz) (Note 11) V

CL = 1.0 mF CL = 100 mF

LP2951A/LP2951AC Only

Reference Voltage (T

= 25°C) V

A

LP2951C/LP2951C−XX/NCV2951C* 1.210 1.235 1.260 LP2951AC/LP2951AC−XX/NCV2951AC* 1.220 1.235 1.250

Reference Voltage (TA = − 40 to +125°C) V

LP2951C/LP2951C−XX/NCV2951C* 1.200 − 1.270 LP2951AC/LP2951AC−XX/NCV2951AC* 1.200 − 1.260

Reference Voltage (TA = − 40 to +125°C) V

IO = 100 mA to 100 mA, Vin = 23 to 30 V

LP2951C/LP2951C−XX/NCV2951C* 1.185 − 1.285 LP2951AC/LP2951AC−XX/NCV2951AC* 1.190 − 1.270

Feedback Pin Bias Current I

Error Comparator

Output Leakage Current (VOH = 30 V) I

Output Low Voltage (Vin = 4.5 V, IOL = 400 mA)

Upper Threshold Voltage (V

Lower Threshold Voltage (V

= 6.0 V) V

in

= 6.0 V) V

in

Hysteresis (Vin = 6.0 V) V

Shutdown Input

Input Logic Voltage

Logic “0” (Regulator “On”) 0 − 0.7 Logic “1” (Regulator “Off”) 2.0 − 30

Shutdown Pin Input Current I

V

= 2.4 V − 35 50

shtdn

V

= 30 V − 450 600

shtdn

Regulator Output Current in Shutdown Mode I

(Vin = 30 V, V

= 2.0 V, VO = 0, Pin 6 Connected to Pin 7)

shtdn

Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product performance may not be indicated by the Electrical Characteristics if operated under different conditions.

7. The Junction−to−Ambient Thermal Resistance is determined by PCB copper area per Figure 29.

8. ESD data available upon request.

9. Low duty pulse techniques are used during test to maintain junction temperature as close to ambient as possible.

10.V

11.Noise tests on the LP2951 are made with a 0.01 mF capacitor connected across Pins 7 and 1.

is the part number voltage option.

O(nom)

*NCV prefix is for automotive and other applications requiring site and change control.

Symbol Min Typ Max Unit

line

Reg

load

− V

I

O

mV

− 30 80

CC

− 93 120

I

CCdropout

Limit

thermal

n

− 110 170

− 220 300 mA

− 0.05 0.20 %/W

mVrms

− 126 −

− 56 −

ref

− 15 40 nA

− 0.01 1.0

− 150 250 mV

40 45 − mV

− 60 95 mV

− 15 − mV

− 3.0 10

V

shtdn

FB

lkg

OL

thu

thl

hy

shtdn

off

%

mA

V

mA

V

mA

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5

LP2950, LP2951, NCV2951

DEFINITIONS

Dropout Voltage − The input/output voltage differential at which the regulator output no longer maintains regulation against further reductions in input voltage. Measured when the output drops 100 mV below its nominal value (which is measured at 1.0 V differential), dropout voltage is affected by junction temperature, load current and minimum input supply requirements.

Line Regulation − The change in output voltage for a change in input voltage. The measurement is made under conditions of low dissipation or by using pulse techniques such that average chip temperature is not significantly affected.

Load Regulation − The change in output voltage for a change in load current at constant chip temperature.

Maximum Power Dissipation − The maximum total device dissipation for which the regulator will operate within specifications.

Bias Current − Current which is used to operate the regulator chip and is not delivered to the load.

10

1.0

Output Noise Voltage − The RMS ac voltage at the output, with constant load and no input ripple, measured over a specified frequency range.

Leakage Current − Current drawn through a bipolar transistor collector−base junction, under a specified collector voltage, when the transistor is “off”.

Upper Threshold Voltage − Voltage applied to the comparator input terminal, below the reference voltage which is applied to the other comparator input terminal, which causes the comparator output to change state from a logic “0” to “1”.

Lower Threshold Voltage − Voltage applied to the comparator input terminal, below the reference voltage which is applied to the other comparator input terminal, which causes the comparator output to change state from a logic “1” to “0”.

Hysteresis − The difference between Lower Threshold voltage and Upper Threshold voltage.

6.0

LP2951C

5.0

T

= 25°C

A

4.0

RL = 50 kW

0.1

LP2950/LP2951 BIAS CURRENT (mA)

0.01

0.1

1.0 10 100 1.0 2.0 3.0 4.0 5.0 6.0

IL, LOAD CURRENT (mA)

Figure 2. Quiescent Current

5.00

4.99

4.98

4.97

, OUTPUT VOLTAGE (V)

4.96

out

V

4.95

-50

0 50 100 150

T

, AMBIENT TEMPERATURE (°C)

A

Figure 4. Output Voltage versus Temperature

LP2951C

200

3.0

2.0

, OUTPUT VOLTAGE (V)

out

1.0

V

6.0

5.0

4.0

3.0

2.0

, OUTPUT VOLTAGE (V)

out

1.0

V

RL = 50 W

0

V

, INPUT VOLTAGE (V)

in

Figure 3. 5.0 V Dropout Characteristics over

Load

LP2951C

25°C

125°C

0

−40°C

1.0 2.0 3.0 4.0

, INPUT VOLTAGE (V)

V

in

Figure 5. 5.0 V Dropout Characteristics with

R

= 50 W

L

6.05.0

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6

LP2950, LP2951, NCV2951

0

BIAS CURRENT ( A)μ

L

R

DROPOUT VOLTAGE (mV) = 50

550

500

450

400

350

300

250

200

150

100

50

0

-50

400

350

TA = 25°C

0.1 mA Load Current

300

250

200

150

No Load

100

DROPOUT VOLTAGE (mV)

50

0

5.0 10 15 20 25

0.1

Vin, INPUT VOLTAGE (V)

Figure 6. Input Current

55

Figure 7. Dropout Voltage versus Output Current

5.0

1.0 10 100

IO, OUTPUT CURRENT (mA)

LP2951C R

= 330 k

4.0

3.0

2.0

L

T

A

= 25°C

Vin Decreasing

Vin Increasing

RL = 50

50

L

R

45

40

, OUTPUT VOLTAGE (V)

RL = 50 k

0 50 100 150

T, TEMPERATURE (°C)

35

30

DROPOUT VOLTAGE (mV) = 50 k

out

1.0

V

0

4.70

4.74 4.78 4.82 4.86

4.9

Vin, INPUT VOLTAGE (V)

Figure 8. Dropout Voltage versus Temperature Figure 9. Error Comparator Output

8.0

7.5

7.0

6.5

, INPUT VOLTAGE (V)

in

V

6.0

5.5 0

100 200 300

V

in

V

out

TA = 25°C

= 1.0 mF

C

L

I

= 1.0 mA

L

V

= 5.0 V

O

400 500 600 700 800

t, TIME (ms)

4.0

2.0

0

-2.0

-4.0

-6.0

6.0

5.0

4.0

3.0

2.0

1.0

0

OUTPUT VOLTAGE CHANGE (mV)

SHUTDOWN AND OUTPUT VOLTAGE (V)

-1.0

-100

CL = 1.0 mF

CL = 10 mF

Shutdown Input

0 100 200 300 400

t, TIME (ms)

Figure 10. Line Transient Response Figure 11. LP2951 Enable Transient

TA = 25°C I

= 10 mA

L

V

= 8.0 V

in

V

= 5.0 V

out

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7

LP2950, LP2951, NCV2951

200

150

100

50

LOAD CURRENT (mA)

-50

4.0

3.0

μ

2.0

1.0

VOLTAGE NOISE ( V/ Hz)√

0

CL = 1.0 mF V

= 5.0 V

out

= 400 mA to 75 mA

I

L

T

= 25°C

A

I

Load

V

t, TIME (ms)

Figure 12. Load Transient Response

CL = 1.0 mF

CL = 100 mF

out

IL= 100 mA T

A

V LP2951C

= 25°C

= 5.0 V

O

42.50.5 1.5 2 3 3.51

400

200

0

-200

OUTPUT VOLTAGE CHANGE (mV)

-400

80

60

40

TA = 25°C

20

RIPPLE REJECTION (dB)

= 1.0 mF

C

L

V

= 6.0 V

in

V

= 5.0 V

out

0

1.0

10 100

Figure 13. Ripple Rejection

1.8

1.6

1.4

1.2

1.0

Output “On"

1.0 k

f, FREQUENCY (Hz)

Output “Off"

IL= 0.1 mA

10 k 100 k

100

80

60

40

, OUTPUT CURRENT (mA)

20

out

V

0 100

1.0 k

f, FREQUENCY (Hz)

Figure 14. Output Noise

TA = 75°C

LP2951CN

0

5.0 15 25 35 4010 20 30

0

Vin, INPUT VOLTAGE (V)

Figure 16. Maximum Rated

Output Current

10 k 100 k

TA = 25°C

4.0

2.0

0

-2.0

-4.0 OUTPUT VOLTAGE CHANGE (mV)

-6.0

SHUTDOWN THRESHOLD VOLTAGE (V)

0.8

-20 40 80 120 160

-40

60 100 140200

t, TEMPERATURE (°C)

Figure 15. Shutdown Threshold Voltage

versus Temperature

10000

1000

100

10

Unstable Region

Stable Region

ESR (ohms)

1

0.1 Lower unstable region is for 0.1 mF only.

1 mF and 100 mF show no instability with low ESR values.

0.01 0 102030405060708090100

Unstable Region for 0.1 mF capacitor only

Output Current (mA)

V

out

100 mF

0.1 mF

= 5 V

Figure 17. Output Stability versus Output Capacitor

Change

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Semiconductor LP2950, LP2951, NCV2951 User manual

Specifications and Main Features

Frequently Asked Questions

User Manual