MOTOROLA LP2950, LP2951 Technical data

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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 µA 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 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, SO–8 and Micro–8 surface mount packages. The ‘A’ suffix devices feature an initial output voltage tolerance ±0.5%.

LP2950 and LP2951 Features:

• Low Quiescent Bias Current of 75 µA

• Low Input–to–Output Voltage Differential of 50 mV at 100 µA 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 µF Output Capacitor for Stability

• Internal Current and Thermal Limiting

Output

MICROPOWER

LOW DROPOUT

VOLTAGE REGULATORS

Z SUFFIX

PLASTIC PACKAGE

CASE 29

(TO–226AA/TO–92)

DT SUFFIX

PLASTIC PACKAGE

CASE 369A

(DPAK)

123

(Top View)

Heatsink surface (shown as terminal 4 in

case outline drawing) is connected to Pin 2.

D SUFFIX

PLASTIC PACKAGE

CASE 751

(SO–8)

Pin: 1. Input

2. Ground

3. Output

Pin: 1. Output

2. Ground

3. Input

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 Ordering Information.)

MOTOROLA ANALOG IC DEVICE DATA

N SUFFIX

PLASTIC PACKAGE

CASE 626

DM SUFFIX

PLASTIC PACKAGE

CASE 846A

(Micro–8)

Output

Sense

Shutdown

 Motorola, Inc. 1996 Rev 4

3 4

Gnd

(Top View)

Input

Feedback

VO Tap

Error Output

LP2950 LP2951

Fixed Voltage

(

)

LP2950CDT–**

(3.0, 3.3 or 5.0 V)

LP2950ACDT–**

DPAK

LP2951CD–**

Adjustable or Fixed

LP2951ACD–**

(3.0, 3.3 V)

40° t

125°C

LP2951CN–**

Adjustable or Fixed

LP2951ACN–**

(3.0, 3.3 V)

LP2951CDM–**

Adjustable or Fixed

LP2951ACDM–**

(3.0, 3.3 V)

ORDERING INFORMATION

Operating

Device Type

LP2950CZ–** LP2950ACZ–**

–**

LP2951CD LP2951ACD

–**

LP2951CN LP2951ACN

–**

LP2951CDM LP2951ACDM

–**

** = Voltage option of 3.0, 3.3 or 5.0 V.

Fixed Voltage

3.0, 3.3 or 5.0 V

Adjustable or

5.0 V Fixed

Adjustable or

5.0 V Fixed

Adjustable or

5.0 V Fixed

DEVICE TYPE/NOMINAL OUTPUT VOLTAGE

Device No. (±1%) Device No. (±0.5%) Nominal Voltage

LP2950CX–5.0 LP2950ACX–5.0 5.0 LP2950CX–3.3 LP2950ACX–3.3 3.3 LP2950CX–3.0 LP2950ACX–3.0 3.0

LP2951CX LP2951ACX Adjustable or 5.0 LP2950CX–3.3 LP2951ACX–3.3 Adjustable or 3.3 LP2951CX–3.0 LP2951ACX–3.0 Adjustable or 3.0

X = Package suffix.

Battery or

Unregulated DC

Temperature Range

TO–92/TO–226AA

= –

o +

Representative Block Diagrams

Input

Package

DPAK

SO–8

Plastic

Micro–8

182 k

Output 1

5.0 V/100 mA

1.0

Error Amplifier

1.23 V

Reference

Gnd 2

Battery or

Unregulated DC

Shutdown

From CMOS/TTL

Input 8 Output

Amplifier

60 k

50 k

Gnd 4

Error

1.23 V

Reference

60 k

Sense 2

182 k

75 mV/

60 mV

Error Detection

Comparator

LP2950CZ–5.0

5.0 V/100 mA

1.0 µF

VO Tap

60 k

This device contains 34 active transistors.

7 Feedback

Error Output

LP2951CD or CN

330 k

To CMOS/TTL

MOTOROLA ANALOG IC DEVICE DATA

LP2950 LP2951

БББББ

БББББ БББББ

MAXIMUM RATINGS (T

= 25°C, unless otherwise noted.)

Rating Symbol Value Unit

Input Voltage

Power Dissipation and Thermal Characteristics

Maximum Power Dissipation P

Internally Limited W

Case 751(SO–8) D Suffix

Thermal Resistance, Junction–to–Ambient R Thermal Resistance, Junction–to–Case R

θJA θJC

180 °C/W

45 °C/W

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

Thermal Resistance, Junction–to–Ambient R Thermal Resistance, Junction–to–Case R

θJA θJC

92 °C/W

6.0 °C/W

Case 29 (TO–226AA/TO–92) Z Suffix

Thermal Resistance, Junction–to–Ambient R Thermal Resistance, Junction–to–Case R

θJA θJC

160 °C/W

83 °C/W

Case 626 N Suffix

Thermal Resistance, Junction–to–Ambient R

θJA

105 °C/W

Case 846A (Micro–8) DM Suffix

Thermal Resistance, Junction–to–Ambient R

Feedback Input Voltage Shutdown Input Voltage Error Comparator Output Voltage Operating Junction Temperature Storage Temperature Range

NOTE: 1.The Junction–to–Ambient Thermal Resistance is determined by PC board copper area

per Figure 26.

2.ESD data available upon request.

θJA

err

stg

240 °C/W

–1.5 to +30 –0.3 to +30

–0.3 to +30 –40 to +125 –65 to +150

Vdc

Vdc Vdc Vdc

°C °C

ELECTRICAL CHARACTERISTICS (V

= VO + 1.0 V, IO = 100 µA, CO = 1.0 µF, TJ = 25°C [Note 1], unless otherwise

noted.)

Characteristic

Output Voltage, 5.0 V Versions V

Symbol Min Typ Max Unit

Vin = 6.0 V, IO = 100 µA, TJ = 25°C

LP2950C–5.0/LP2951C 4.950 5.000 5.050 LP2950AC–5.0/LP2951AC 4.975 5.000 5.025

TJ = –40 to +125°C

LP2950C–5.0/LP2951C 4.900 – 5.100 LP2950AC–5.0/LP2951AC 4.940 – 5.060

Vin = 6.0 to 30 V, IO = 100 µA to 100 mA, TJ = –40 to +125°C

LP2950C–5.0/LP2951C 4.880 – 5.120 LP2950AC–5.0/LP2951AC 4.925 – 5.075

Output Voltage, 3.3 V Versions V

Vin = 4.3 V, IO = 100 µA, TJ = 25°C

LP2950C–3.3/LP2951C–3.3 3.267 3.300 3.333 LP2950AC–3.3/LP2951AC–3.3 3.284 3.300 3.317

TJ = –40 to +125°C

LP2950C–3.3/LP2951C–3.3 3.234 – 3.366 LP2950AC–3.3/LP2951AC–3.3 3.260 – 3.340

Vin = 4.3 to 30 V, IO = 100 µA to 100 mA, TJ = –40 to +125°C

LP2950C–3.3/LP2951C–3.3 3.221 – 3.379 LP2950AC–3.3/LP2951AC–3.3 3.254 – 3.346

Output Voltage, 3.0 V Versions V

Vin = 4.0 V, IO = 100 µA, TJ = 25°C

LP2950C–3.0/LP2951C–3.0 2.970 3.000 3.030 LP2950AC–3.0/LP2951AC–3.0 2.985 3.000 3.015

TJ = –40 to +125°C

LP2950C–3.0/LP2951C–3.0 2.940 – 3.060 LP2950AC–3.0/LP2951AC–3.0 2.964 – 3.036

Vin = 4.0 to 30 V, IO = 100 µA to 100 mA, TJ = –40 to +125°C

LP2950C–3.0/LP2951C–3.0 2.928 – 3.072 LP2950AC–3.0/LP2951AC–3.0 2.958 – 3.042

MOTOROLA ANALOG IC DEVICE DATA

LP2950 LP2951

ELECTRICAL CHARACTERISTICS (continued)

noted.)

Characteristic UnitMaxTypMinSymbol

Line Regulation (Vin = V

LP2950C–XX/LP2951C/LP2951C–XX – 0.08 0.20 LP2950AC–XX/LP2951AC/LP2951AC–XX – 0.04 0.10

Load Regulation (IO = 100 µA to 100 mA) Reg

LP2950C–XX/LP2951C/LP2951C–XX – 0.13 0.20 LP2950AC–XX/LP2951AC/LP2951AC–XX – 0.05 0.10

Dropout Voltage VI – V

IO = 100 µA – 30 80 IO = 100 mA – 350 450

Supply Bias Current I

IO = 100 µA – 93 120 µA IO = 100 mA – 4.0 12 mA

Dropout Supply Bias Current (Vin = V

IO = 100 µA) [Note 2] Current Limit (VO Shorted to Ground) I Thermal Regulation Reg Output Noise Voltage (10 Hz to 100 kHz) [Note 3] V

CL = 1.0 µF – 126 – CL = 100 µF – 56 –

LP2951A/LP2951AC ONL Y

Reference Voltage (TJ = 25°C) V

LP2951C/LP2951C–XX 1.210 1.235 1.260 LP2951AC/LP2951AC–XX 1.220 1.235 1.250

Reference Voltage (TJ = –40 to +125°C) V

LP2951C/LP2951C–XX 1.200 – 1.270 LP2951AC/LP2951AC–XX 1.200 – 1.260

Reference Voltage (TJ = –40 to +125°C) V

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

LP2951C/LP2951C–XX 1.185 – 1.285 LP2951AC/LP2951AC–XX 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 µA) V Upper Threshold Voltage (Vin = 6.0 V) V Lower Threshold Voltage (Vin = 6.0 V) V Hysteresis (Vin = 6.0 V) V

SHUTDOWN INPUT

Input Logic Voltage V

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

Shutdown Pin Input Current I

= 2.4 V – 35 50

shtdn

= 30 V – 450 600

shtdn

Regulator Output Current in Shutdown Mode I

(Vin = 30 V, V

NOTES: 1. Low duty pulse techniques are used during test to maintain junction temperature as close to ambient as possible.

2.V

O(nom)

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

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

shtdn

is the part number voltage option.

+1.0 V to 30 V) [Note 2] Reg

O(nom)

– 0.5 V,

O(nom)

(Vin = VO + 1.0 V, IO = 100 µA, CO = 1.0 µF, TJ = 25°C [Note 1], unless otherwise

line

load

CCdropout

Limit

thermal

ref

lkg

OL thu

thl hy

shtdn

off

– 110 170 µA

– 220 300 mA – 0.05 0.20 %/W

– 15 40 nA

– 0.01 1.0 µA – 150 250 mV

40 45 – mV

– 60 95 mV – 15 – mV

– 3.0 10 µA

µVrms

µA

MOTOROLA ANALOG IC DEVICE DATA

LP2950 LP2951

DEFINITIONS

Dropout V oltage – The input/output voltage dif ferential 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.

Figure 1. Quiescent Current

1.0

Output Noise V oltage – 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.

Figure 2. Dropout Characteristics

6.0 LP2951C

5.0

4.0

TA = 25

RL = 50 k

0.1

LP2950/LP2951 BIAS CURRENT (mA)

0.01

250

200

150

100

BIAS CURRENT ( A)

0.1

3.0

RL = 50

2.0

, OUTPUT VOL TAGE (V)

out

1.0

1.0 10 100 1.0 2.0 3.0 4.0 5.0 6.0 IL, LOAD CURRENT (mA)

Vin, INPUT VOLTAGE (V)

Ω

Figure 3. Input Current Figure 4. Output Voltage versus Temperature

5.00

, OUTPUT VOL TAGE (V)

out

4.99

4.98

4.97

4.96

4.95 –50

TA, AMBIENT TEMPERATURE (

LP2951C

0.1 mA Load Current

No Load

5.0 10 15 20 25 0 50 100 150 Vin, INPUT VOLTAGE (V)

MOTOROLA ANALOG IC DEVICE DATA

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