UNISONIC TECHNOLOGIES CO., LTD

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1 MC33A UNISONIECHNOLOGIES CO., LTD DO DC CONVETE CONTOLLE DESCIPTION The UTC MC33A is a monolithic regulator subsystem, intended for use as DC to DC converter. This device contains a temperature compensated band gap reference, a duty-cycle control oscillator, driver and high current output switch. It can be used for step down, step-up or inverting switching regulators as well as for series pass regulators. FEATUES *Operation from 3.V to V. *Short circuit current limiting. *Low standby current. *Output switch current of.a without external transistors. *Frequency of operation from Hz to khz. *Step-up, step-down or inverting switch regulators. SOP-8 DIP-8 *Pb-free plating product number:mc33al ODEING INFOMATION Ordering Number Normal Lead Free Plating Package Packing MC33A-D8-T MC33AL-D8-T DIP-8 Tube MC33A-S8- MC33AL-S8- SOP-8 Tape eel MC33A-S8-T MC33AL-S8-T SOP-8 Tube MC33AL-D8-T ()Packing Type ()Package Type (3)Lead Plating () T: Tube, : Tape eel () D8: DIP-8, S8: SOP-8 (3) L: Lead Free Plating, Blank: Pb/Sn of 9 Copyright Unisonic Technologies Co., Ltd

2 MC33A PIN CONFIGUATION Switch Collector 8 Driver Collector Switch Emitter IPEAK Sense Timing Capacitor 3 Vcc GND Comparator Inverting input BLOCK DIAGAM E Switch Collector T T Q S D 8 Drive Collector Switch Emitter Timing Capacitor C Is A CT OSCILLATO 3 IPEAK Sense Vcc COMP. GND.VEF B Comparator Inverting Input UNISONIECHNOLOGIES CO., LTD of 9

3 MC33A ABSOLUTE MAXIMUM ATINGS (Ta= C ) PAAMETE SYMBOL ATINGS UNIT Supply Voltage V CC V Comparator Input Voltage ange V IN(COMP) -.3 ~ V Switch Collector Voltage V C(SW) V Switch Emitter Voltage V E(SW) V Switch Collector to Emitter Voltage V CE(SW) V Driver Collector Voltage V C(D) V Switch Current I SW. A Power Dissipation (Ta= C) DIP- P D SOP-8 mw Junction Temperature T J C Operating Temperature T OP - ~ 8 C Storage Temperature T STG - ~ C Note:.Absolute maximum ratings are those values beyond which the device which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied..the device is guaranteed to meet performance specification within ~ operating temperature range and assured by design from - ~8, characteristic and correlation with static process control. ELECTICAL CHAACTEISTICS(V CC =.V, Ta= ~ C, unless otherwise specified.) PAAMETE SYMBOL TEST CONDITIONS MIN TYP MAX UNIT Oscillator Charging Current I CHG V CC = to V, Ta= C 3 µa Discharging Current I DISCHG V CC = to V, Ta= C 9 µa Oscillator Amplitude V OSa= C. V Discharge to Charge Current atio K V =V CC, Ta= C... Current limit Sense Voltage V SENSE I CHG =I DISCHG, Ta= C 3 3 mv Output Switch Saturation Voltage (Note) V CE(SAT) I SW =.A, V C(DIVE) =V C(SW).9.3 V Saturation Voltage (Note) V CE(SAT) I SW =.A, V C(DIVE) =ma.. V DC Current Gain(Note) G I (DC) I SW =.A, V CE =.V, Ta= C 8 Collector Off State Current(Note) I C(OFF) V CE =.V, Ta= C. µa Comparator Threshold Voltage V THD...9 V Threshold voltage Line egulation V THD V CC =3 ~ V.. mv Input Bias Current I BIAS V IN =V na Total Device Supply Current I CC V CC =~V, =. V =V CC, V C >V THD, Pin=GND.. ma NOTE: Output switch tests are performed under pulsed conditions to minimize power dissipation. THEMAL DATA Thermal esistance Junction-Case PAAMETE SYMBOL ATINGS UNIT DIP- SOP-8 JA /W UNISONIECHNOLOGIES CO., LTD 3 of 9

4 MC33A STEP-UP CONVETE H L SC. V 8 8 V CC - I PK O SC Comp. S Q Q.V EF EG Q 3 pf N89.k k 8V/mA 33 CO. H Optional Filter Test Conditions esults Line egulation V IN = 8.V ~ V, I OUT = ma 3mV = ±.% Load egulation V IN = V, I OUT = ma ~ ma mv = ±.% Output ipple V IN = V, I OUT = ma mvp-p Efficiency V IN = V, I OUT = ma 8.% Output ipple With Optional Filter V IN = V, I OUT = ma mvp-p UNISONIECHNOLOGIES CO., LTD of 9

5 MC33A STEP-DOWN CONVETE(Cont.) S Q Q Q SC.33 V V CC - I PK O SC Comp..V EF EG N89 3 L pf H.k 3.k.V/mA C O. H Optional Filter Test Conditions esults Line egulation V IN = V ~ V, I OUT = ma mv = ±.% Load egulation V IN = V, I OUT = ma ~ ma 3.mV = ±.3% Output ipple V IN = V, I OUT = ma mvp-p Short Circuit Current V IN = V, L =.Ω.A Efficiency V IN = V, I OUT = ma 83.% Output ipple With Optional Filter V IN = V, I OUT = ma mvp-p UNISONIECHNOLOGIES CO., LTD of 9

6 MC33A VOLTAGE INVETING CONVETE S Q Q Q SC..V ~.V V CC - I PK O SC Comp..V EF EG L 3 88 H pf N89 8.k 93 -V/mA f C O. H Optional Filter Test Conditions esults Line egulation V IN =.V ~.V, I OUT = ma 3.mV = ±.% Load egulation V IN =.V, I OUT = ma ~ ma.v = ±.9% Output ipple V IN =.V, I OUT = ma mvp-p Short Circuit Current V IN =.V, L =.Ω 9mA Efficiency V IN =.V, I OUT = ma.% Output ipple With Optional Filter V IN =.V, I OUT = ma mvp-p UNISONIECHNOLOGIES CO., LTD of 9

7 MC33A EXTENAL CUENT BOOST CONNECTIONS FO IC PEAK GEATE THAN.A a. External NPN Switch b. External NPN Saturated Switch (See Note ) SC SC for constant NOTE:. If the output switch is driven into hard saturation (non-dartington configuration) at low switch currents ( 3mA) and high driver currents ( 3mA), it may take up to. s to come out of saturation. This condition will shorten the off time at frequencies 3kHz, and is magnified at high temperatures. This condition does not occur with a Darlington configuration, since the output switch cannot saturate. If a non-darlington configuration is used, the following output drive condition is recommended. a. External NPN Switch b. External PNP Saturated Switch SC SC 3a. External NPN Switch 3b. External PNP Saturated Switch UNISONIECHNOLOGIES CO., LTD of 9

8 MC33A TYPICAL CHAACTEISTICS Output Switch ON-OFF Time, ION-OFF ( F) Figure.Output Switch ON-OFF Time versus Oscillator Timing Capacitor V CC =.V Pin = V CC Pin = Gnd Ta = t ON. t OFF Oscilator Timing Capacitor, (nf) Oscilator Voltage, VOSC (V) Figure. Timing Capacitor Waveform V CC =.V Pin = V CC Pin = Gnd Pin,,8 = Open =.nf Ta = s/div mv/div Saturation Voltage, VCE(SAT) (V) Figure 3. Emitter Follower Configuration Output Saturation Voltage versus Emitter Current V CC =.V Pin,,8 = V CC Pin 3, = Gnd Ta = Emitter Current, I E (A) Saturation Voltage, VCE(SAT) (V) Figure. Common Emitter Configuration Output Switch Saturation Voltage versus Coilector Current V CC =.V Pin = V CC Pin,3, = Gnd Ta = Emitter Current, I E (A) Darlington Connection Forced ß = Current Limit Sense Voltage, VIPK(SENSE) (V) Figure. Current Limit Sense Voltage versus Temperature V CC =.V I CHG = dischg - Ambient Temperaurent, Ta ( ) Supply Current, ICC (ma) Figure. Standby Supply Current versus Supply Voltage. 3 3 Supply Voltage, V CC (V) Darlington Connection =.nf Pin = V CC Pin = Gnd UNISONIECHNOLOGIES CO., LTD 8 of 9

9 MC33A DESIGN FOMULA TABLE CALCULATION STEP-DOWN STEP-UP VOLTAGE-INVETING ton V OUT V F V OUT V F - V IN(MIN) V OUT V F toff V IN(MIN) - V CE(SAT) - V OUT V IN(MIN) - V CE(SAT) V IN - V CE(SAT) (t ON t OFF ) MAX FMIN FMIN FMIN x - t ON x - t ON x - t ON I SW I OUT(MAX) I OUT(MAX) t ON t OFF t OFF I OUT(MAX) t ON t OFF t OFF S.3/I SW.3/I SW.3/I SW L(MIN) C O V IN(MIN) - V CE(SAT) - V OUT V IN(MIN) - V CE(SAT) V IN(MIN) - V CE(SAT) ( ) t ON(MAX) ( ) t ON(MAX) ( ) t ON(MAX) I SW I SW I SW (t ON t OFF ) I OUT t ON I OUT t ON 8V IPPLE(P-P) V IPPLE(P-P) V IPPLE(P-P) I SW V CE(SAT) V F - Saturation voltage of the output switch. - Forward voltage drop of the ringback rectifier. The following power supply characteristics must be chosen: V IN - Nominal input voltage. V OUT - Desired output voltage, V OUT =. (B/A) I OUT - Desired output current. F MIN - Minimum desired output switching frequency at the selected values for V IN and I OUT. V IPPLE(P-P) - Desired peak-to-peak output ripple voltage. In practice, the calculated value will need to be increased due to the capacitor equivalent series resistance and board layout. The ripple voltage should be kept to a low value since it will directly effect the line and load regulation. UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all UTC products described or contained herein. UTC products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. eproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. UNISONIECHNOLOGIES CO., LTD 9 of 9