MC33762 dual DropOut (LDO) regulator featuring excellent noise perform
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MC33762 Dual Ultra Low-Noise Dropout Voltage Regulator with ON/OFF Control
MC33762 dual DropOut (LDO) regulator featuring excellent noise performances. Thanks innovative design, circuit reaches impressive µVRMS noise level without external bypass capacitor. Housed small package, represents ideal designer's choice when space noise premium. absence external bandgap capacitor accelerates response time wake-up signal keeps within making MC33762 natural candidate portable applications. MC33762 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 from choppy lines.
Micro8 SUFFIX CASE 846A
Nominal Output Current with Peak Capability Ultra-Low Noise: nV/Hz µVRMS
Hz-100 Typical, Iout Fast Response Time from Typical Ready Platforms: with High Level Typical Dropout Ripple Rejection: 1.5% Output Precision 25°C Thermal Shutdown Vout Available Separate Dice Each Regulator Provides Maximum Isolation Between Regulators Operating Range from +85°C
CONFIGURATION MARKING DIAGRAM
Gnd1 (Top View) Year Work Week Gnd2
Vout1 VCC1 Vout2 VCC2
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
Semiconductor Components Industries, LLC, 2001
February, 2001 Rev.
Publication Order Number: MC33762/D
MC33762
Thermal Shutdown VCC1
On/Off Band Reference
*Current Limit *Antisaturation Protection *Load Transient Improvement
Vout
GND1
On/Off Band Reference
Thermal Shutdown
VCC2
*Current Limit *Antisaturation Protection *Load Transient Improvement
Vout
GND2
Figure Simplified Block Diagram
FUNCTION DESCRIPTIONS
Name Gnd1 Gnd2 Vcc2 Vout2 Vcc1 Vout1 Function Ground Enables Ground Enables Shuts wakes-up Delivers output voltage level this sufficient start this LDO. shuts down. This brings power requires adequate decoupling. This requires output capacitor stable. This brings power requires adequate decoupling. This requires output capacitor stable. level this sufficient start this LDO. shuts down. Description
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 Internally limited shutdown. Specifications guaranteed below this value. Pins Pins Symbol RqJ-A TJmax Tstg Internally Limited +150 Unit °C/W
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MC33762
ELECTRICAL CHARACTERISTICS
(For typical values 25°C, min/max values -40°C +85°C, 125°C unless otherwise noted) Characteristics Symbol Unit
Logic Control Specifications
Input Voltage Range ON/OFF Input Resistance (all versions) ON/OFF Control Voltages (Note Logic Zero, State, Logic One, State, VON/OFF RON/OFF VON/OFF
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) IQOFF IQON IQSAT IMAX
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 2.955 3.250 3.546 -1.5 2.425 2.716 2.91 3.201 3.492 -3.0 2.537 2.842 3.045 3.349 3.654 +1.5 2.575 2.884 3.090 3.399 3.708 +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 Voltage slope should greater than mV/ms Regline Regload Vin-Vout Vin-Vout Vin-Vout
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MC33762
ELECTRICAL CHARACTERISTICS (continued)
(For typical values 25°C, min/max values -40°C +85°C, 125°C unless otherwise noted) Characteristics Symbol Unit
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)
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MC33762
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 µVRMS.
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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MC33762
Characterization Curves
Curves Common Both Regulators
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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MC33762
APPLICATION HINTS
Input Decoupling Protections
with regulator, necessary reduce dynamic impedance supply rail that feeds component. capacitor either ceramic tantalum recommended should connected close MC33762 package. Higher values will correspondingly improve overall line transient response.
Output Decoupling
Thanks novel concept, MC33762 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 Performances
MC33762 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 MC33762 dissipate 25°C. power dissipated MC33762 calculated from following formula:
Ptot Ptot
Unlike other LDOs, MC33762 true low-noise regulator. Without need external bypass capacitor, typically reaches incredible level µVRMS 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, MC33762 operates without bypass element thus offers typical start-up phase.
output current needed, ground current extracted from data-sheet curves: half MC33762 (2.8 operating 25°C, maximum input voltage will then
Typical Applications
following picture portrays typical application MC33762.
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MC33762
Input
Output Output
MC33762 Regulator Regulator
On/Off
On/Off
Figure Typical Application Schematic
noise designs, particular care taken when tackling Printed Circuit Board (PCB) layout. Connections shall kept short wide. Layout example
given MC33761 application hints used starting basis.
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MC33762
Understanding Load Transient Improvement MC33762 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 MC33762 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 MC33762 with Load Transient Improvement
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MC33762
MC33762 Fast Start-Up Phase Thanks lack bypass capacitor MC33762 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. MC33762 offers best both worlds since longer includes bypass capacitor starts less than typically (Repetitive Hz). also ensures incredible low-noise level µVRMS Hz-100 kHz. following picture details typical 33762 startup phase.
Figure Repetitive Start-Up Waveforms
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MC33762
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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MC33762
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 MC33762 Typical Noise Density Performance
(OHMS) 25°C Cout 1,000 100,000 10,000 FREQUENCY (Hz) 1,000,000 1,000 100,000 10,000 FREQUENCY (Hz) 1,000,000
(dB) -100
Figure MC33762 Typical Ripple Rejection Performance
Figure Output Impedance Plot Cout Vout
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MC33762
MINIMUM RECOMMENDED FOOTPRINT SURFACE MOUNTED APPLICATIONS Surface mount board layout critical portion total design. footprint semiconductor packages must correct size ensure proper solder connection interface between board package. With correct geometry, packages will self-align when subjected solder reflow process.
0.041 1.04
0.208 5.28
0.126 3.20
0.015 0.38
0.0256 0.65
inches
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MC33762
ORDERING INFORMATION
Part Number MC33762DM-2525R2 MC33762DM-2828R2 MC33762DM-3030R2 Voltage Output Package Micro-8 Micro-8 Micro-8 Shipping 4000 Units Tape Reel 4000 Units Tape Reel 4000 Units Tape Reel
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MC33762
PACKAGE DIMENSIONS
Micro8 PLASTIC PACKAGE CASE 846A-02 ISSUE
NOTES: DIMENSIONING TOLERANCING ANSI Y14.5M, 1982. CONTROLLING DIMENSION: MILLIMETER. DIMENSION DOES INCLUDE MOLD FLASH, PROTRUSIONS GATE BURRS. MOLD FLASH, PROTRUSIONS GATE BURRS SHALL EXCEED 0.15 (0.006) SIDE. DIMENSION DOES INCLUDE INTERLEAD FLASH PROTRUSION. INTERLEAD FLASH PROTRUSION SHALL EXCEED 0.25 (0.010) SIDE. MILLIMETERS 2.90 3.10 2.90 3.10 -1.10 0.25 0.40 0.65 0.05 0.15 0.13 0.23 4.75 5.05 0.40 0.70 INCHES 0.114 0.122 0.114 0.122 -0.043 0.010 0.016 0.026 0.002 0.006 0.005 0.009 0.187 0.199 0.016 0.028
0.08 (0.003)
SEATING PLANE
0.038 (0.0015)
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MC33762
Semiconductor 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.
PUBLICATION ORDERING INFORMATION
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MC33762/D
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