LP8345 Dropout, 500mA CMOS Linear Regulator LP8345 low-dropout CM
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LP8345 Dropout, 500mA CMOS Linear Regulator
LP8345 Dropout, 500mA CMOS Linear Regulator
LP8345 low-dropout CMOS linear regulator available 3.3V, 2.5V, 1.8V adjustable output versions. Packaged package DPAK they deliver 500mA output current. Typical dropout voltage 500mA 210mV 5.0V version, 270mV 3.3V version 335mV 2.5V version. devices include zener trimmed bandgap voltage reference, foldback current limiting thermal overload limiting. LP8345 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 210mV Typical Dropout 500mA Wide Operating Range 2.7V Internal 500mA PMOS Output Transistor 19µA Typical Quiescent Current Thermal Overload Limiting Foldback Current Limiting Zener Trimmed Bandgap Reference Space saving package Temperature Range LP8345C 125°C LP8345I -40°C 125°C
Applications
Hard Disk Drives Notebook Computers Battery Powered Electronics Portable Instrumentation
Typical Applications
Fixed VOUT
20064801
Adjustable VOUT
20064802
2003 National Semiconductor Corporation
DS200648
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LP8345
Ordering Information
Package 6-Pin Part Number LP8345CLD-ADJ LP8345CLDX-ADJ LP8345CLD-1.8 LP8345CLDX-1.8 LP8345CLD-2.5 LP8345CLDX-2.5 LP8345CLD-3.3 LP8345CLDX-3.3 LP8345CLD-5.0 LP8345CLDX-5.0 LP8345ILD-ADJ LP8345ILDX-ADJ LP8345ILD-1.8 LP8345ILDX-1.8 LP8345ILD-2.5 LP8345ILDX-2.5 LP8345ILD-3.3 LP8345ILDX-3.3 LP8345ILD-5.0 LP8345ILDX-5.0 3-Pin DPAK LP8345CDT-1.8 LP8345CDTX-1.8 LP8345CDT-2.5 LP8345CDTX-2.5 LP8345CDT-3.3 LP8345CDTX-3.3 LP8345CDT-5.0 LP8345CDTX-5.0 LP8345IDT-1.8 LP8345IDTX-1.8 LP8345IDT-2.5 LP8345IDTX-2.5 LP8345IDTX-3.3 LP8345IDT-3.3 LP8345IDTX-5.0 LP8345IDT-5.0 Package Marking L045B L046B L047B L048B L049B L073B L074B L075B L076B L077B LP8345CDT-1.8 LP8345CDT-2.5 LP8345CDT-3.3 LP8345CDT-5.0 LP8345IDT-1.8 LP8345IDT-2.5 LP8345IDTX-3.3 LP8345IDTX-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 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 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
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LP8345
Connection Diagrams
6-Pin FIXED OUTPUT VOLTAGE 6-Pin ADJUSTABLE OUTPUT VOLTAGE
20064806 20064804
Bottom View
Bottom View
Note: Pins (Pin must connected together externally full 500mA operation (250mA pin). VOUT Sense (Pin must connected VOUT (Pin
T0-252
20064805
View
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LP8345
Absolute Maximum Ratings
(Notes
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 Rating -0.3V -65°C 160°C 150°C (Note
Operating Ratings(Notes
Supply Voltage Temperature Range LP8345C LP8345I 125°C -40°C 125°C
LP8345C 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 LP8345-ADJ,1.8, LP8345-3.3, LP8345-ADJ, IOUT 10mA, 2.7V, 25°C 100µA IOUT 500mA, 2.7V VINVOUT LP8345-1.8 IOUT 10mA, 2.8V, 25°C 100µA IOUT 500mA, 2.8V VIN6V LP8345-2.5 IOUT 10mA, 3.5V, 25°C 100µA IOUT 500mA, 3.5V 6.5V LP8345-3.3 IOUT 10mA, 4.3V 25°C 100µA IOUT 500mA, 4.3V 7.5V LP8345-5.0 IOUT 10mA, 25°C 100µA IOUT 500mA, Load Regulation LP8345-ADJ, ADJ=OUT IOUT 500mA, 2.7V LP8345-1.8 IOUT 500mA, 2.8V LP8345-2.5 IOUT 500mA, 3.5V LP8345-3.3 IOUT 500mA, 4.3V LP8345-5.0 IOUT 500mA, Line Regulation VOUT 0.5V 10V, IOUT 25mA (Note LP8345-2.5 IOUT 500mA LP8345-3.3 LP8345-ADJ, VOUT 3.3V, IOUT 500mA LP8345-5.0 IOUT 500mA Quiescent Current Minimum Load Current VOUT (Note (Note (Note 1.250 1.269 1.288 1.827 1.854 2.538 2.575 3.350 3.399 5.075 5.150 Units
1.231 1.213 1.773 1.746 2.463 2.425 3.250 3.201 4.925 4.850
1.800
2.500
3.300
5.000
Dropout Voltage (Note (Note
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LP8345
LP8345C Electrical Characteristics
Symbol ILIMIT Parameter Foldback Current Limit Ripple Rejection Ratio Thermal Shutdown Temp. Thermal Shutdown Hyst. Input Leakage Current VOUT Leakage Current VADJ 1.5V VOUT VOUT
(Continued) Unless otherwise specified limits guaranteed COUT 10µF, 25°C. Boldface limits apply over full operating temperature range 125°C Conditions (Note (Note 1200 (Note Units
(dc) VOUT (ac) 1VP-P 120Hz
0.01
LP8345-ADJ OUT, VOUT LP8345-1.8, VOUT 2.5V, LP8345-2.5, VOUT 3.5V, LP8345-3.3, VOUT LP8345-5.0, VOUT
µVrms
Output Noise
10Hz 10kHz, COUT 10µF
LP8345I Electrical Characteristics
Unless otherwise specified limits guaranteed COUT 10µF, 25°C. Boldface limits apply over full operating temperature range -40°C 125°C Symbol VOUT Parameter Input Voltage Output Voltage Conditions LP8345-ADJ,1.8, LP8345-3.3, LP8345-ADJ, IOUT 10mA, 2.7V, 25°C 100µA IOUT 500mA, 2.7V VINVOUT LP8345-1.8 IOUT 10mA, 2.8V, 25°C 100µA IOUT 500mA, 2.8V VIN6V LP8345-2.5 IOUT 10mA, 3.5V, 25°C 100µA IOUT 500mA, 3.5V 6.5V LP8345-3.3 IOUT 10mA, 4.3V 25°C 100µA IOUT 500mA, 4.3V 7.5V LP8345-5.0 IOUT 10mA, 25°C 100µA IOUT 500mA, Load Regulation LP8345-ADJ, ADJ=OUT IOUT 500mA, 2.7V LP8345-1.8 IOUT 500mA, 2.8V LP8345-2.5 IOUT 500mA, 3.5V LP8345-3.3 IOUT 500mA, 4.3V LP8345-5.0 IOUT 500mA,
(Note
(Note
(Note
Units
1.231 1.213 1.773 1.746 2.463 2.425 3.250 3.201 4.925 4.850
1.250
1.269 1.288 1.827 1.854 2.538 2.575 3.350 3.399 5.075 5.150
1.800
2.500
3.300
5.000
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LP8345
LP8345I Electrical Characteristics
Symbol Parameter Line Regulation
(Continued) Unless otherwise specified limits guaranteed COUT 10µF, 25°C. Boldface limits apply over full operating temperature range -40°C 125°C Conditions VOUT 0.5V 10V, IOUT 25mA (Note LP8345-2.5 IOUT 500mA LP8345-3.3 LP8345-ADJ, VOUT 3.3V, IOUT 500mA LP8345-5.0 IOUT 500mA (Note (Note (Note Units
Dropout Voltage (Note (Note
1200
ILIMIT
Quiescent Current Minimum Load Current Foldback Current Limit Ripple Rejection Ratio
VOUT VOUT VOUT (dc) VOUT (ac) 1VP-P 120Hz
Thermal Shutdown Temp. Thermal Shutdown Hyst. Input Leakage Current VOUT Leakage Current VADJ 1.5V LP8345-ADJ OUT, VOUT LP8345-1.8, VOUT 2.5V, LP8345-2.5, VOUT 3.5V, LP8345-3.3, VOUT LP8345-5.0, 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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LP8345
Typical Performance Characteristics
Unless otherwise specified, 1.5V, COUT 10µF ceramic, 25°C Output Voltage Change Temperature Dropout Voltage Load Current
20064807
20064808
Ground Current Temperature (ILOAD 500mA)
Ground Current Load Current
20064809
20064810
Ground Current Input Voltage
Ripple Rejection Ratio Frequency
20064811
20064812
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LP8345
Typical Performance Characteristics
Load Transient Response
(Continued) Line Transient Response
20064813
20064814
Start-up Response
20064815
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LP8345
Applications Section
GENERAL INFORMATION LP8345 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.
20064803
FIGURE LP8345 Functional Block Diagram EXTERNAL CAPACITOR Input capacitor greater required between LP8345 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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LP8345
Physical Dimensions
inches (millimeters) unless otherwise noted
6-Pin Package Number LDE06A
3-Pin DPAK Package Number TD03B
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LP8345 Dropout, 500mA 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 Email: ap.support@nsc.com
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.
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