LP2951CMX - ON SEMICONDUCTOR

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LP2951 — Adjust able Micro-Power Voltage Regulator

LP2951 Rev. 1.1.1

August 2014

LP2951

Adjustable Micro-Power Voltage Regulator

Features

• Adjustable or Fixed 5 V Output Voltage

• Low Quiescent Current

• Low Dropout Voltage

• Low Temperature Coef f ic ien t

• Tight Line and Load Regulation

• Guaranteed 100 mA Output Current

• Internal Short Current and Thermal Limit

• Error Signals of Output Dropout

• External Shut Down

Applications

• Automotive Electro nic s

• Voltage Reference

Ordering Information

Block Diagram

Figure 1. Block Diagram

Part Number Operating

Temperature Range Top Mark Package Packing Method

LP2951CM -40°C to +125°C LP2951CM SOIC 8L Rail

LP2951CMX -40°C to +125°C LP2951CM SOIC 8L Tape and Reel

1.26V

[3]

Description

The LP2951 is an adjustable micro-power voltage regu-

lator suitable for battery-powered systems. This regula-

tor has various functions such as alarm that warns of a

low output voltage often due to falling batteries on the

input, the external shutdown enables the regulator to be

switched on and off, current and temperature limiting.

8-SOIC

LP2951 — Adjust able Micro-Power Voltage Regulator

LP2951 Rev. 1.1.1 2

Absolute Maximum Ratings

Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be opera-

ble above the re co mmen ded operating conditions and s tres si ng the parts to these level s i s not recommended. In addi-

tion, extended exposure to stresses above the recommended operating conditions may affect device reliability. The

absolute maximum ratings are stress ratings only. Values are at TA = 25°C unless otherwise noted.

Electrical Characteristics

FEEDBACK (Pin 7) tied to TAP (Pin 6), VOUT (Pin 1) tied to PROGRAM (Pin 2). Values are at TA = 25°C, unless other-

wise specified.

Notes:

1. Output or reference voltage temperature coefficient is defined as the worst-case voltage change divided by the total

temperature range.

2. Regulation is measured at constant junction temperature, using pulse testing with a low duty cy cle.

3. VREF ≤ VOUT ≤ (VIN - 1 V), 2.5 V ≤ VIN ≤ 28 V, 100 μA ≤ IL ≤ 100 mA, TA ≤ TAMAX.

4. Threshold and hysteresis are expressed in terms of voltage differential at the feedback terminal below the normal

reference. To express these thresholds in terms of output voltage change, multiply by the error amplifier gain

= VO / VREF = (R1 + R2) / R2.

5. Vshutdown ≤ 0.6 V, VOUT = ON, Vshutdown ≥ 2.0 V, VOUT = OFF.

Symbol Parameter Value Unit

VIN Input Supply Voltage -0.3 to 30.0 V

PDPower Dissipation Internally Limited W

RθJA Thermal Resistance Ju nction-to-Air 127.5 °C/W

TSTG Storage Temperature Range -65 to 150 °C

TOPR Operating Junction Temperature Range -40 to 125 °C

Symbol Parameter Conditions Min. Typ. Max. Unit

VOUT Fixed Output Voltage IL = 50 mA 4.9 5.0 5.1 V

ALL VOLTAGE OPTIONS

ΔV/ΔTOutput Voltage Temperature

Coefficient(1) 50 ppm/°C

ΔV Line Regulation(2) (VO + 1) V ≤ VIN ≤ 28 V,

IL = 50 mA 0.4 %

ΔV Load Regulation(2) 100 μA ≤ IL ≤ 100 mA 0.3 %

VDDropout Voltage IL = 100 μA150

IL = 100 mA 600

IGGround Current IL = 100 μA140μA

IL = 100 mA 7 mA

ICL Current Limit VO = 0 V 110 165 220 mA

VREF Reference Voltage VIN = (VO + 1) V, IL = 100 μA 1.235 1.260 1.285 V

(3) 1.225 1.260 1.295

IFB Feedback Bias Curren t 20 nA

ERROR COMPARATOR

VOL Output Low Voltage VIN = (VO - 0.5) V, IOL = 400 μA150400mV

VTH High Thresho ld Voltage(4) 25 60 mV

VTL Low Threshold Vo ltage(4) 75 140 mV

VHYS Hysteresis(4) 15 mV

SHUTDOWN INPUT

VSD Shutdown Threshold Range (5) 0.6 1.3 2.0 V

ISD Shutdown Input Current VSD = 2.4 V 30 100 μA

VSD = 28 V 450 750

LP2951 — Adjust able Micro-Power Voltage Regulator

LP2951 Rev. 1.1.1 3

Typical Performance Characteristics

Figure 2. Quiescent Current Figure 3. Dropout Characteristics

Figure 4. Input Current Figure 5. Input Current

Figure 6. Output Voltage vs. Temperature Figure 7. Short-Circuit Current

0.1

100

0.4

0.8

1.2

1.6

2.0

GROUND CURRENT(mA)

LOAD CURRENT(mA)

0 1 2 3

OUTPUT VOLTAGE(V)

INPUT VOLTAGE(V)

5V OUTPUT RL=50KΩ

RL=50Ω

810

100

150

200

250

INPUT CURRENT(uA)

INPUT VOLTAGE(V)

5V OUTPUT RL=50K

RL=∞

0 2 4 6

100

120

INPUT CURRENT(mA)

INP UT VOLT A G E ( V)

RL=50Ω

-50

-25

100 125

4.94

4.96

4.98

5.00

5.02

5.04

5.06

OUTPUT VOLTAGE(V)

TEMPERATURE(

5V OUTPUT

-50 -25 025 50

100 125

100

120

140

160

180

200

SHORT CIRCUIT CURRENT(mA)

TEMPERATURE(

LP2951 — Adjust able Micro-Power Voltage Regulator

LP2951 Rev. 1.1.1 4

Typical Performance Characteristics (Continued)

Figure 8. Dropout Voltage Figure 9. Dropout Voltage

-50-250 255075100125

100

200

300

400

500

600

DROPOUT VOLTAGE(V)

TEMPERATURE(oC)

= 100mA

= 100PA

0.1 1 10 100

100

200

300

400

500

DROPOUT VOLTAGE(mV)

OUTPUT CURRENT(mA)

J = 25

LP2951 — Adjust able Micro-Power Voltage Regulator

LP2951 Rev. 1.1.1 5

Typical Application

Figure 10. Adjustable Regulator

Figure 11. Fixed Output 5 V

Note:

6. CO is required between the output an d ground for s tabil ity at output volta ges of 5 V or more. Since IFB is cont rolled to

less than 40 nA, the error associated with this term is negligible in most applications. At lower output voltage, more

capacitance is required. without this capacitance the part oscillates.

SHUTDOWN

VO = VREF (1+ R

2)+IFB R1

OUT

VIN

R1Co

1μF

KA78RLOOD

VIN

VOUT 1

FB7

VREF

GND

ERROR

LP2951

* Pin2 and Pin 6

are left open

(6)

SHUTDOWN

OUT

VIN

R1Co

1μF

KA78RLOOD

VIN

VOUT 1

FB7

VREF

GND

ERROR

LP2951

TAP 6

Program 2(6)

LP2951 — Adjust able Micro-Power Voltage Regulator

LP2951 Rev. 1.1.1 6

Typical Application (Continued)

Figure 12. Wide Input Voltage Range Current Limiter Figure 13. 5 V Regulator with 2.5 V Sleep Function

Figure 14. Low Drift Current Source Figure 15. 5 V Current Limiter

Figure 16. Latch Off When Error Flag Occurs Figure 17. Open Circuit Detector for 4 mA to 20 mA

Current Loop

LP2951 — Adjust able Micro-Power Voltage Regulator

LP2951 Rev. 1.1.1 7

Typical Application (Continued)

Figure 18. Low Battery Disconnect

PROGRAM

LP2951 — Adjust able Micro-Power Voltage Regulator

LP2951 Rev. 1.1.1 8

Physical Dimensions

Figure 19. 8 Lead, SOIC, JEDEC MS-012, 0.150 inch NARROW BODY

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without notic e. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor represe ntative to verify or

obtain the most recent revision. Package specifica tions do not expand the terms of Fairchild’s worldwide terms and conditions, specifically the

warranty therein, which covers Fairchild produ cts.

Always visit Fairchild Semiconduct or’s online packaging are a for the most recent package drawings :

http://www.fairchildsemi.com/dwg/M0/M08A.pdf.

For current tape an d reel specifications, visit Fair child Semiconductor’s online pac kaging area:

http://www.fairchildsemi.com/packing_dwg/PKG-M08A.pdf.

TRADEMARKS

The following includes registered and unregistered trademarks and service marks, owned by Fairchild Semiconductor and/or its global subsidiaries, and is not

intended to be an exhaustive list of all such trademarks.

AccuPower¥

Awinda

AX-CAP

BitSiC¥

Build it Now¥

CorePLUS¥

CorePOWER¥

CROSSVOLT¥

CTL¥

Current Transfer Logic¥

DEUXPEED

Dual Cool™

EcoSPARK

EfficientMax¥

ESBC¥

Fairchild

Fairchild Semiconductor

FACT Quiet Series¥

FACT

FAST

FastvCore¥

FETBench¥

FPS¥

F-PFS¥

FRFET

Global Power Resource

GreenBridge¥

Green FPS¥

Green FPS¥ e-Series¥

Gmax¥

GTO¥

IntelliMAX¥

ISOPLANAR¥

Making Small Speakers Sound Louder

and Better™

MegaBuck¥

MICROCOUPLER¥

MicroFET¥

MicroPak¥

MicroPak2¥

MillerDrive¥

MotionMax¥

MotionGrid

MTi

MTx

MVN

mWSaver

OptoHiT¥

PowerTrench

PowerXS™

Programmable Active Droop¥

QFET

QS¥

Quiet Series¥

RapidConfigure¥

Saving our world, 1mW/W/kW at a time™

SignalWise¥

SmartMax¥

SMART START¥

Solutions for Your Success¥

SPM

STEALTH¥

SuperFET

SuperSOT¥-3

SuperSOT¥-6

SuperSOT¥-8

SupreMOS

SyncFET¥

Sync-Lock™

®*

TinyBoost

TinyBuck

TinyCalc¥

TinyLogic

TINYOPTO¥

TinyPower¥

TinyPWM¥

TinyWire¥

TranSiC¥

TriFault Detect¥

TRUECURRENT

μSerDes¥

UHC

Ultra FRFET¥

UniFET¥

VCX¥

VisualMax¥

VoltagePlus¥

XS™

Xsens™

௝❺

™

* Trademarks of System General Corporation, used under license by Fairchild Semiconductor.

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Rev. I71

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Buyer is responsible for its products and applications using ON Semiconductor products, including compliance with all laws, regulations and safety requirements or standards,

regardless of any support or applications information provided by ON Semiconductor. “Typical” parameters which may be provided in ON Semiconductor data sheets and/or

specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer

application by customer’s technical experts. ON Semiconductor does not convey any license under its patent rights nor the rights of others. ON Semiconductor products are not

designed, intended, or authorized for use as a critical component in life support systems or any FDA Class 3 medical devices or medical devices with a same or similar classification

in a foreign jurisdiction or any devices intended for implantation in the human body. Should Buyer purchase or use ON Semiconductor products for any such unintended or unauthorized

application, Buyer shall indemnify and hold ON Semiconductor and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and

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