LP8340 Dropout, 1.0A CMOS Linear Regulator LP8340 low-dropout CMO

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LP8340 Dropout, 1.0A CMOS Linear Regulator LP8340 low-dropout CMO

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LP8340 Dropout, 1.0A CMOS Linear Regulator
LP8340 Dropout, 1.0A CMOS Linear Regulator
LP8340 low-dropout CMOS linear regulator available 3.3V, 2.5V, 1.8V adjustable output versions. Packaged package DPAK. LP8340 deliver 1.0A output current. Typical dropout voltage 420mV 1.0A 5.0V version, 540mV 1.0A 3.3V version, 670mV 1.0A 2.5V version 680mV 800mA 1.8V version. LP8340 includes zener trimmed bandgap voltage reference, foldback current limiting thermal overload limiting. LP8340 features PMOS output transistor which unlike type dropout regulators requires base drive current. This allows device ground current remain less than 50µA over operating temperature, supply voltage irrespective load current.
Features
1.5% Typical VOUT tolerance 420mV Typical Dropout 1.0A Wide Operating Range 2.7V Operating Temperature Range 125°C Internal 1.0A PMOS Output Transistor 19µA Typical Quiescent Current Thermal Overload Limiting Foldback Current Limiting Zener Trimmed Bandgap Reference Space saving package
Applications
Hard Disk Drives Notebook Computers Battery Powered Electronics Portable Instrumentation
Typical Applications
Fixed VOUT
20060901
Adjustable VOUT
20060902
2003 National Semiconductor Corporation
DS200609
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LP8340
Ordering Information
Package 6-Pin Part Number LP8340CLD-ADJ LP8340CLDX-ADJ LP8340CLD-1.8 LP8340CLDX-1.8 LP8340CLD-2.5 LP8340CLDX-2.5 LP8340CLD-3.3 LP8340CLDX-3.3 LP8340CLD-5.0 LP8340CLDX-5.0 3-Pin DPAK LP8340CDT-1.8 LP8340CDTX-1.8 LP8340CDT-2.5 LP8340CDTX-2.5 LP8340CDT-3.3 LP8340CDTX-3.3 LP8340CDT-5.0 LP8340CDTX-5.0 Package Marking L041B L042B L043B L051B L044B LP8340CDT-1.8 LP8340CDT-2.5 LP8340CDT-3.3 LP8340CDT-5.0 Transport Media Units Tape Reel 4.5k Units Tape Reel Units Tape Reel 4.5k Units Tape Reel Units Tape Reel 4.5k Units Tape Reel Units Tape Reel 4.5k Units Tape Reel Units Tape Reel 4.5k Units Tape Reel Units/Rail 2.5k Units Tape Reel Units/Rail 2.5k Units Tape Reel Units/Rail 2.5k Units Tape Reel Units/Rail 2.5k Units Tape Reel TD03B Drawing LDE06A
Connection Diagrams
6-Pin FIXED OUTPUT VOLTAGE 6-Pin ADJUSTABLE OUTPUT VOLTAGE
20060906 20060904
Bottom View
Bottom View
Note: Pins (Pin must connected together externally full operation (500mA pin). VOUT Sense (Pin must connected VOUT (Pin
T0-252
20060905
View
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LP8340
Absolute Maximum Ratings
(Notes
Rating Human Body Model (Note Machine Model 200V
Military/Aerospace specified devices required, please contact National Semiconductor Sales Office/ Distributors availability specifications. VIN, VOUT, VOUT Sense, Storage Temperature Range Junction Temperature (TJ) Power Dissipation -0.3V -65°C 160°C 150°C (Note
Operating Ratings(Notes
Temperature Range Supply Voltage 125°C
Electrical Characteristics
Unless otherwise specified limits guaranteed COUT 10µF, 25°C. Boldface limits apply over full operating temperature range 125°C Symbol VOUT Parameter Input Voltage Output Voltage Conditions LP8340-ADJ,1.8, LP8340-3.3, LP8340-ADJ, IOUT 10mA, 2.7V, 25°C 100µA IOUT 800mA, 3.0V VINVOUT 800mA IOUT 1.0A, 3.2V VOUT LP8340-1.8 IOUT 10mA, 2.8V, 25°C 100µA IOUT 800mA, 3.2V VIN6V 800mA IOUT 1.0A, 3.4V LP8340-2.5 IOUT 10mA, 3.8V, 25°C 100µA IOUT 1.0A, 3.8V 6.5V LP8340-3.3 IOUT 10mA, 4.3V 25°C 100µA IOUT 1.0A, 4.3V 7.5V LP8340-5.0 IOUT 10mA, 25°C 100µA IOUT 1.0A, Load Regulation LP8340-ADJ, ADJ=OUT IOUT 1.0A, 3.2V LP8340-1.8 IOUT 1.0A, 3.4V LP8340-2.5 IOUT 1.0A, 3.5V LP8340-3.3 IOUT 1.0A, 4.3V LP8340-5.0 IOUT 1.0A, Line Regulation VOUT 0.5V 10V, IOUT 25mA (Note (Note (Note (Note 1.269 1.288 1.288 1.827 1.854 1.854 2.538 2.575 3.350 3.399 5.075 5.150 Units
1.231 1.213 1.213 1.773 1.746 1.746 2.463 2.425 3.250 3.201 4.925 4.850
1.250
1.800
2.500
3.300
5.000
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LP8340
Electrical Characteristics
Symbol Parameter
(Continued) Unless otherwise specified limits guaranteed COUT 10µF, 25°C. Boldface limits apply over full operating temperature range 125°C Conditions LP8340-1.8 IOUT 800mA LP8340-2.5 IOUT 800mA LP8340-2.5 IOUT 1.0A LP8340-3.3 LP8340-ADJ, VOUT 3.3V, IOUT 800mA LP8340-3.3 LP8340-ADJ, IOUT 1.0A LP8340-5.0 IOUT 800mA LP8340-5.0 IOUT 1.0A (Note (Note 1600 (Note 1400 1000 1300 1000 Units
Dropout Voltage (Note (Note
ILIMIT
Quiescent Current Minimum Load Current Foldback Current Limit Ripple Rejection Ratio
VOUT VOUT VOUT (dc) VOUT (ac) VP-P 120Hz
Thermal Shutdown Temp. Thermal Shutdown Hyst. Input Leakage Current VOUT Leakage Current VADJ 1.5V LP8340-ADJ OUT, VOUT LP8340-1.8, VOUT 2.5V, LP8340-2.5, VOUT 3.5V, LP8340-3.3, VOUT LP8340-5.0, VOUT
0.01
µVrms
Output Noise
10Hz 10kHz, COUT 10µF
Note Absolute Maximum ratings indicate limits beyond which damage occur. Electrical specifications apply when operating device outside rated operating conditions. Note voltages with respect potential ground pin. Note Maximum Power dissipation device calculated using following equations:
where TJ(MAX) maximum junction temperature, ambient temperature, junction-to-ambient thermal resistance. value package specifically dependant trace area, trace material, number layers thermal vias. improved thermal resistance power dissipation package, refer Application Note AN-1187. Note Typical Values represent most likely parametric norm. Note limits guaranteed testing statistical analysis. Note Human body model 1.5k series with 100pF. Note Condition does apply input voltages below 2.7V since this minimum input operating voltage. Note Dropout voltage measured reducing until drops 100mV from normal value.
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LP8340
Typical Performance Characteristics
Unless otherwise specified, 1.5V, COUT 10µF ceramic, 25°C Output Voltage Change Temperature Dropout Voltage Load Current
20060907
20060908
Ground Current Temperature (ILOAD
Ground Current Load Current
20060909
20060910
Ground Current Input Voltage
Ripple Rejection Ratio Frequency
20060911
20060912
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LP8340
Typical Performance Characteristics
LP8340-1.8V
(Continued) LP8340-ADJ
20060919
20060920
Load Transient Response
Line Transient Response (ILOAD 10mA)
20060913
20060914
Start-up Response
20060915
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LP8340
Applications Section
GENERAL INFORMATION LP8340 low-dropout, quiescent current linear regulator. shown Figure consists 1.25V reference, error amplifier, MOSFET driver, PMOS pass transistor fixed output versions, internal feedback network (R1/R2). addition, device protected from overload thermal shutdown circuit foldback current limit circuit 1.25V reference connected inverting input error amplifier. Regulation output voltage achieved means negative feedback noninverting input error amplifier. Feedback resistors either internal external device, depending whether fixed voltage version adjustable version. negative feedback high open loop gain error amplifier cause inputs error virtually equal voltage. output voltage changes load changes, error amplifier MOSFET driver provide appropriate drive pass transistor maintain error amplifier's inputs virtually equal.
20060903
FIGURE LP8340 Functional Block Diagram EXTERNAL CAPACITOR Input capacitor greater required between LP8340 ground. While will provide adequate bypassing supply larger values input capacitor (i.e. 10µF) provide improved bypassing power supply noise. Stable operation achieved with output capacitor greater, either ceramic dielectric aluminum/ tantalum electrolytic. While minimum capacitor value 1µF, typical output capacitor values selected range from 10µF. larger values provide improved loadtransient response, power supply rejection stability. OUTPUT VOLTAGE SETTING (ADJ VERSION ONLY) output voltage according amount negative feedback (Note that pass transistor inverts feedback signal). This feedback determined with resulting output voltage represented following equation:
following equation determine values desired VOUT recommended).
MINIMUM LOAD CURRENT minimum load 100µA required regulation stability over entire operating temperature range. actual load current fall below 100µA recommended that resistor value VO/100µA placed between ground.
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LP8340
Physical Dimensions
inches (millimeters) unless otherwise noted
6-Pin Package Number LDE06A
3-Pin DPAK Package Number TD03B
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LP8340 Dropout, 1.0A CMOS Linear Regulator
Notes
LIFE SUPPORT POLICY NATIONAL'S PRODUCTS AUTHORIZED CRITICAL COMPONENTS LIFE SUPPORT DEVICES SYSTEMS WITHOUT EXPRESS WRITTEN APPROVAL PRESIDENT GENERAL COUNSEL NATIONAL SEMICONDUCTOR CORPORATION. used herein: Life support devices systems devices systems which, intended surgical implant into body, support sustain life, whose failure perform when properly used accordance with instructions provided labeling, reasonably expected result significant injury user.
National Semiconductor Americas Customer Support Center Email: new.feedback@nsc.com Tel: 1-800-272-9959 www.national.com National Semiconductor Europe Customer Support Center Fax: 180-530 Email: europe.support@nsc.com Deutsch Tel: 9508 6208 English Tel: 2171 Tel: 8790
critical component component life support device system whose failure perform reasonably expected cause failure life support device system, affect safety effectiveness.
National Semiconductor Asia Pacific Customer Support Center Fax: +65-6250 4466 Email: ap.support@nsc.com Tel: +65-6254 4466
National Semiconductor Japan Customer Support Center Fax: 81-3-5639-7507 Email: jpn.feedback@nsc.com Tel: 81-3-5639-7560
National does assume responsibility circuitry described, circuit patent licenses implied National reserves right time without notice change said circuitry specifications.

LP8340 Dropout, 1.0A CMOS Linear Regulator LP8340 low-dropout CMO

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