MC33761 DropOut (LDO) regulator featuring excellent noise performances
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MC33761 Ultra Low-Noise Dropout Voltage Regulator with ON/OFF Control
MC33761 DropOut (LDO) regulator featuring excellent noise performances. Thanks innovative design, circuit reaches impressive mVRMS noise level without external bypass capacitor. Housed small SOT-23 leads-like package, represents ideal designer's choice when space noise premium. absence external bandgap capacitor accelerates response time wake-up signal keeps within repetitive mode), making MC33761 natural candidate portable applications. MC33761 also hosts novel architecture which prevents excessive undershoots presence fast transient bursts, bursting systems. Finally, with static line regulation better than naturally shields downstream electronics against choppy lines.
THIN SOT-23-5 SUFFIX CASE
CONNECTIONS MARKING DIAGRAM
Ultra-Low Noise: nV/Hz mVRMS Fast Response Time from Typical
Repetition Rate Ready Platforms: with High Level Nominal Output Current with Peak Capability Typical Dropout Ripple Rejection: 1.5% Output Precision 25°C Thermal Shutdown Vout Available Operating Range from +85°C Dual Version Available MC33762 Pb-Free Packages Available Hz-100 Typical, Iout
ON/OFF LxxAYW (Top View) Device Code Assembly Location Year Work Week Pb-Free Package (Note: Microdot either location) Vout
ORDERING INFORMATION
detailed ordering shipping information package dimensions section page this data sheet.
Applications
Noise Sensitive Circuits: VCOs Stages, etc. Bursting Systems (TDMA Phones) Battery Operated Devices
On/Off Band Reference Vout Thermal Shutdown
*Current Limit *Antisaturation Protection *Load Transient Improvement
Figure Simplified Block Diagram
Semiconductor Components Industries, LLC, 2006
July, 2006 Rev.
Publication Order Number: MC33761/D
MC33761
FUNCTION DESCRIPTIONS
Name ON/OFF Vout Function Powers IC's ground Shuts wakes-up None Delivers output voltage level this sufficient start shuts down. makes connect known potential, like pin-to-pin replacement case. This requires output capacitor stable. Description positive voltage applied upon this pin.
MAXIMUM RATINGS
Value Rating Power Supply Voltage Capability, Model Capability, Machine Model Maximum Power Dissipation Suffix, Plastic Package Thermal Resistance Junction-to-Air Operating Ambient Temperature Maximum Junction Temperature (Note Maximum Operating Junction Temperature (Note Storage Temperature Range Pins Pins Symbol RqJA TJmax Tstg Internally Limited +150 Unit °C/W
Stresses exceeding Maximum Ratings damage device. Maximum Ratings stress ratings only. Functional operation above Recommended Operating Conditions implied. Extended exposure stresses above Recommended Operating Conditions affect device reliability.
ELECTRICAL CHARACTERISTICS
(For typical values 25°C, min/max values -40°C +85°C, 125°C unless otherwise noted) Characteristics LOGIC CONTROL SPECIFICATIONS Input Voltage Range ON/OFF Input Resistance (all versions) ON/OFF Control Voltages (Note Logic Zero, State, Logic One, State, CURRENTS PARAMETERS Current Consumption State (all versions) Mode Current: Vout VOFF Current Consumption State (all versions) Mode Current: Vout Current Consumption State (all versions), Mode Saturation Current: Vout Output Load Current Limit Voutnom Output brought Voutnom (all versions) Internally limited shutdown. Specifications guaranteed below this value. Voltage slope should greater than mV/ms. IQOFF VON/OFF RON/OFF VON/OFF Symbol Unit
IQON IQSAT IMAX
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MC33761
ELECTRICAL CHARACTERISTICS (continued)
(For typical values 25°C, min/max values -40°C +85°C, 125°C unless otherwise noted) Characteristics Symbol Unit
OUTPUT VOLTAGES
Vout 25°C, Iout Other Voltages Available Increment Steps Vout -40°C +85°C, Iout Other Voltages Available Increment Steps Vout Vout Vout Vout Vout Vout Vout Vout Vout Vout Vout Vout 2.462 2.758 2.857 2.955 4.925 -1.5 2.425 2.716 2.813 2.91 4.850 -3.0 2.537 2.842 2.943 3.045 5.075 +1.5 2.575 2.884 2.987 3.090 5.150 +3.0
LINE LOAD REGULATION, DROPOUT VOLTAGES
Line Regulation (all versions) Vout Iout Load Regulation (all versions) Vout Cout Iout Dropout Voltage (all versions) (Note Iout Iout Iout Regline Regload Vin-Vout Vin-Vout Vin-Vout
DYNAMIC PARAMETERS
Ripple Rejection (all versions) Vout mVpp Sinusoidal Signal Output Noise Density Output Noise Voltage (all versions) Cout Iout Output Rise Time (all versions) Cout Iout Rising Signal Nominal Vout Ripple Noise trise
THERMAL SHUTDOWN
Thermal Shutdown (all versions) Vout brought Vout
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MC33761
DEFINITIONS
Load Regulation Line Regulation
change output voltage change output current constant chip temperature.
Dropout Voltage
input/output differential which regulator output longer maintains regulation against further reductions input voltage. Measured when output drops below nominal value (which measured differential value). dropout level affected chip temperature, load current minimum input supply requirements.
Output Noise Voltage
change output voltage change input voltage. measurement made under conditions dissipation using pulse technique such that average chip temperature significantly affected. usually distinguishes static line regulation line regulation step input voltage generates corresponding step output voltage) from ripple rejection audio susceptibility where input combined with frequency generator sweep from hertz defined boundary while output amplitude monitored.
Thermal Protection
This integrated value output noise over specified frequency range. Input voltage output current kept constant during measurement. Results expressed mVRMS.
Maximum Power Dissipation
Internal thermal shutdown circuitry provided protect integrated circuit event that maximum junction temperature exceeded. When activated typically 125°C, regulator turns off. This feature provided prevent catastrophic failures from accidental overheating.
Maximum Package Power Dissipation
maximum total dissipation which regulator will operate within specs.
Quiescent Current
quiescent current current which flows through ground when operates without load output: internal operation, bias etc. When becomes loaded, this term called Ground current. actually difference between input current (measured through input pin) output current.
maximum power package power dissipation power dissipation level which junction temperature reaches maximum operating value, i.e. 125°C. Depending ambient temperature, possible calculate maximum power dissipation thus maximum available output current.
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MC33761
CHARACTERIZATION CURVES
curves taken with Vout Vout Cout
QUIESCENT CURRENT GROUND CURRENT (mA) OUTPUT CURRENT (mA) AMBIENT TEMPERATURE (°C) -40°C 25°C 85°C
Figure Ground Current versus Output Current
85°C OUTPUT VOLTAGE DROPOUT (mV) 25°C -40°C 2.805 2.800 2.795 2.790 2.785 2.780 OUTPUT CURRENT (mA) 2.775
Figure Quiescent Current versus Temperature
85°C 40°C
25°C -20°C -40°C OUTPUT CURRENT (mA)
Figure Dropout versus Output Current
Figure Output Voltage versus Output Current
DROPOUT VOLTAGE (mV) TEMPERATURE (°C)
Figure Dropout versus Temperature
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MC33761
APPLICATION HINTS
Input Decoupling Protections
with regulator, necessary reduce dynamic impedance supply rail that feeds component. capacitor either ceramic tantalum recommended should connected close MC33761 package. Higher values will correspondingly improve overall line transient response.
Output Decoupling
Thanks novel concept, MC33761 stable component does require specific Equivalent Series Resistance (ESR) neither minimum output current. Capacitors exhibiting ESRs ranging from thus safely used. minimum decoupling value augmented fulfill stringent load transient requirements. regulator accepts ceramic chip capacitors well tantalum devices.
Noise Decoupling
MC33761 hosts several protections, giving natural ruggedness reliability products implementing component. output current internally limited maximum value typical while temperature shutdown occurs heats beyond 125°C. These values assess maximum differential voltage device sustain given output current before protections come into play. maximum dissipation package handle given
Jmax
TJmax limited 125°C, then MC33761 dissipate 25°C. power dissipated MC33761 calculated from following formula:
Ptot
Unlike other LDOs, MC33761 true low-noise regulator. Without need external bypass capacitor, typically reaches incredible level mVRMS overall noise between kHz. give maximum insight noise specifications, Semiconductor includes spectral density graphics. classical bypass capacitor impacts start-up phase standard LDOs. However, thanks low-noise architecture, MC33761 operates without bypass element thus offers typical start-up phase.
Ptot
output current needed, ground current extracted from data-sheet curves: MC33761SNT1-28 (2.8 delivering operating 25°C, maximum input voltage will then
Typical Applications
following picture portrays typical application MC33761.
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MC33761
Dropout Charge
Input Permanently Enables When Closed On/Off
MC33761
Output
Figure Typical Application Schematic
noise designs, particular care taken when tackling Printed Circuit Board (PCB) layout. figure below gives example layout where stray inductances/capacitances minimized. This layout
basis MC33761 performance evaluation board. connectors give user easy quick evaluation mean.
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MC33761
Understanding Load Transient Improvement MC33761 features novel architecture which allows user easily implement regulator burst systems where time between current shots kept very small. quality transient response time related many parameters, among which closed-loop bandwidth with corresponding phase margin plays important role. However, other characteristics also come into play like series pass transistor saturation. When current perturbation suddenly appears output, e.g. load increase, error amplifier reacts actively biases transistor. During this reaction time, open-loop output impedance rather high. result, voltage brutally drops until error amplifier effectively closes loop corrects output error. When load disappears, opposite phenomenon takes place with positive overshoot. problem appears when this overshoot decays down steady-state value. During this decreasing phase, stops bias consider asleep (Figure misfortune current shot appears, reaction time incredibly lengthened strong undershoot takes place. This reaction clearly acceptable line sensitive devices, such VCOs other Radio-Frequency parts. This problem dramatically exacerbated when output current drops zero rather than this later case, internal feedback network only discharge path, accordingly lengthening output voltage decay period (Figure MC33761 cures this problem implementing clever design where detects presence overshoot forces system back steady-state soon possible, ready next shot. Figure show positively improves response time decreases negative peak voltage.
Figure Standard Behavior when Load Current Disappears
Figure Standard Behavior when Load Current Appears Decay Zone
Figure Without Load Transient Improvement
Figure MC33761 with Load Transient Improvement
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MC33761
MC33761 Fast Start-Up Phase Thanks lack bypass capacitor MC33761 able supply downstream circuitry soon signal appears. standard LDO, charging time external bypass capacitor hampers response time. simple solution consists suppressing this bypass element but, unfortunately, noise rises unacceptable level. MC33761 offers best both worlds since longer includes bypass capacitor starts less than typically (Repetitive Hz). also ensures low-noise level mVRMS Hz-100 kHz. following picture details typical 33761 start-up phase.
Figure Repetitive Start-Up Waveforms
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MC33761
TYPICAL TRANSIENT RESPONSES
Figure Output Pulsed from
Figure Discharge Effects from
Figure Load Transient Improvement Effect
Figure Load Transient Improvement Effect
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MC33761
TYPICAL TRANSIENT RESPONSES
Vout 25°C Cout Noise, kHz: MHz: 1,000 10,000 100,000 FREQUENCY (Hz) 1,000,000 Noise, kHz: MHz:
nV/sqrt
Figure MC33761 Typical Noise Density Performance
(OHMS) 25°C Cout 1,000 10,000 100,000 FREQUENCY (Hz) 1,000,000 1,000 10,000 100,000 FREQUENCY (Hz) 1,000,000
(dB) -100
Figure MC33761 Typical Ripple Rejection Performance
Figure Typical Output Impedance plot Cout Vout
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MC33761
ORDERING INFORMATION
Device MC33761SNT1-025 MC33761SNT1-025G MC33761SNT1-028 MC33761SNT1-028G MC33761SNT1-029 MC33761SNT1-029G MC33761SNT1-030 MC33761SNT1-030G MC33761SNT1-050 MC33761SNT1-050G Specific Marking Code Voltage Output Package Thin SOT-23-5 Thin SOT-23-5 (Pb-Free) Thin SOT-23-5 Thin SOT-23-5 (Pb-Free) Thin SOT-23-5 Thin SOT-23-5 (Pb-Free) Thin SOT-23-5 Thin SOT-23-5 (Pb-Free) Thin SOT-23-5 Thin SOT-23-5 (Pb-Free) 3000 Tape Reel Shipping
information tape reel specifications, including part orientation tape sizes, please refer Tape Reel Packaging Specifications Brochure, BRD8011/D
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MC33761
PACKAGE DIMENSIONS
TSOP-5 CASE 483-02 ISSUE
NOTES: DIMENSIONING TOLERANCING ASME Y14.5M, 1994. CONTROLLING DIMENSION: MILLIMETERS. MAXIMUM LEAD THICKNESS INCLUDES LEAD FINISH THICKNESS. MINIMUM LEAD THICKNESS MINIMUM THICKNESS BASE MATERIAL. DIMENSIONS INCLUDE MOLD FLASH, PROTRUSIONS, GATE BURRS. OPTIONAL CONSTRUCTION: ADDITIONAL TRIMMED LEAD ALLOWED THIS LOCATION. TRIMMED LEAD EXTEND MORE THAN FROM BODY. MILLIMETERS 3.00 1.50 0.90 1.10 0.25 0.50 0.95 0.01 0.10 0.10 0.26 0.20 0.60 1.25 1.55 2.50 3.00
NOTE
0.20
0.10 0.20
DETAIL
DETAIL
0.05
SEATING PLANE
SOLDERING FOOTPRINT*
0.074
0.95 0.037
0.094 0.039 0.028
SCALE 10:1
inches
*For additional information Pb-Free strategy soldering details, please download Semiconductor Soldering Mounting Techniques Reference Manual, SOLDERRM/D.
Semiconductor registered trademarks Semiconductor Components Industries, (SCILLC). SCILLC reserves right make changes without further notice products herein. SCILLC makes warranty, representation guarantee regarding suitability products particular purpose, does SCILLC assume liability arising application product circuit, specifically disclaims liability, including without limitation special, consequential incidental damages. "Typical" parameters which provided SCILLC data sheets and/or specifications vary different applications actual performance vary over time. operating parameters, including "Typicals" must validated each customer application customer's technical experts. SCILLC does convey license under patent rights rights others. SCILLC products designed, intended, authorized components systems intended surgical implant into body, other applications intended support sustain life, other application which failure SCILLC product could create situation where personal injury death occur. Should Buyer purchase SCILLC products such unintended unauthorized application, Buyer shall indemnify hold SCILLC officers, employees, subsidiaries, affiliates, distributors harmless against claims, costs, damages, expenses, reasonable attorney fees arising directly indirectly, claim personal injury death associated with such unintended unauthorized use, even such claim alleges that SCILLC negligent regarding design manufacture part. SCILLC Equal Opportunity/Affirmative Action Employer. This literature subject applicable copyright laws resale manner.
PUBLICATION ORDERING INFORMATION
LITERATURE FULFILLMENT: American Technical Support: 800-282-9855 Toll Free Literature Distribution Center Semiconductor USA/Canada P.O. 5163, Denver, Colorado 80217 Phone: 303-675-2175 800-344-3860 Toll Free USA/Canada Japan: Semiconductor, Japan Customer Focus Center 2-9-1 Kamimeguro, Meguro-ku, Tokyo, Japan 153-0051 Fax: 303-675-2176 800-344-3867 Toll Free USA/Canada Phone: 81-3-5773-3850 Email: orderlit@onsemi.com Semiconductor Website: http://onsemi.com Order Literature: http://www.onsemi.com/litorder additional information, please contact your local Sales Representative.
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MC33761/D
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