Switch Collector. Switch Emitter. Timing Capacitor

Transcription

1 MC303A, MC3303A, SC303A, SC3303A, NCV3303A. A, Step-Up/Down/ Inverting Switching Regulators The MC303A Series is a monolithic control circuit containing the primary functions required for DC to DC converters. These devices consist of an internal temperature compensated reference, comparator, controlled duty cycle oscillator with an active current limit circuit, driver and high current output switch. This series was specifically designed to be incorporated in Step Down and Step Up and Voltage Inverting applications with a minimum number of external components. Refer to Application Notes AN90A/D and AN9/D for additional design information. Features Operation from 3.0 V to 0 V Input Low Standby Current Current Limiting Output Switch Current to. A Output Voltage Adjustable Frequency Operation to 00 khz Precision % Reference Pb Free Packages are Available Drive Collector I pk Sense V CC Comparator Inverting Input I pk Oscillator S Q R C T Comparator - 00 (Bottom View) Q. V Reference Regulator Q This device contains 9 active transistors. 3 Switch Collector Switch Emitter Timing Capacitor GND SOIC D SUFFIX CASE PDIP P, P SUFFIX CASE DFN CASE AF x = 3 or A = Assembly Location L, WL = Wafer Lot Y, YY = Year W, WW = Work Week G or = Pb Free Package MARKING DIAGRAMS 3x03 ALYWA 3x03V ALYWA 3x03AP AWL YYWWG 3303AVP AWL YYWWG 3303 ALYWA Figure. Representative Schematic Diagram ORDERING INFORMATION See detailed ordering and shipping information in the package dimensions section on page of this data sheet. Semiconductor Components Industries, LLC, 00 August, 00 Rev. 3 Publication Order Number: MC303A/D

2 Switch Collector Switch Emitter Timing Capacitor GND 3 (Top View) Driver Collector I pk Sense V CC Comparator Inverting Input Switch Collector Switch Emitter Timing Capacitor GND ÇÇ ÇÇ ÇÇ ÇÇ EP Flag (Top View) Ç Ç Ç Ç Driver Collector I pk Sense V CC Comparator Inverting Input Figure. Pin Connections MAXIMUM RATINGS Rating Symbol Value Unit Power Supply Voltage V CC 0 Vdc Comparator Input Voltage Range V IR 0.3 to 0 Vdc Switch Collector Voltage V C(switch) 0 Vdc Switch Emitter Voltage (V Pin = 0 V) V E(switch) 0 Vdc Switch Collector to Emitter Voltage V CE(switch) 0 Vdc Driver Collector Voltage V C(driver) 0 Vdc Driver Collector Current (Note ) I C(driver) 00 ma Switch Current I SW. A Power Dissipation and Thermal Characteristics Plastic Package, P, P Suffix T A = C P D. W Thermal Resistance R JA C/W SOIC Package, D Suffix T A = C P D mw Thermal Resistance R JA 0 C/W DFN Package T A = C P D. mw Thermal Resistance R JA 0 C/W Operating Junction Temperature T J 0 C Operating Ambient Temperature Range T A C MC303A, SC303A 0 to 0 MC3303AV, NCV3303A 0 to MC3303A, SC3303A 0 to Storage Temperature Range T stg to 0 C Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability.. Maximum package power dissipation limits must be observed.. This device series contains ESD protection and exceeds the following tests: Human Body Model 000 V per MIL STD 3, Method 30. Machine Model Method 00 V. 3. NCV prefix is for automotive and other applications requiring site and change control.

3 ELECTRICAL CHARACTERISTICS (V CC =.0 V, T A = T low to T high [Note ], unless otherwise specified.) Characteristics Symbol Min Typ Max Unit OSCILLATOR Frequency (V Pin = 0 V, C T =.0 nf, T A = C) f osc 33 khz Charge Current (V CC =.0 V to 0 V, T A = C) I chg 3 A Discharge Current (V CC =.0 V to 0 V, T A = C) I dischg A Discharge to Charge Current Ratio (Pin to V CC, T A = C) I dischg /I chg... Current Limit Sense Voltage (I chg = I dischg, T A = C) V ipk(sense) mv OUTPUT SWITCH (Note ) Saturation Voltage, Darlington Connection (I SW =.0 A, Pins, connected) Saturation Voltage (Note ) (I SW =.0 A, R Pin = to V CC, Forced 0) V CE(sat).0.3 V V CE(sat) V DC Current Gain (I SW =.0 A, V CE =.0 V, T A = C) h FE 0 Collector Off State Current (V CE = 0 V) I C(off) A COMPARATOR Threshold Voltage T A = C T A = T low to T high Threshold Voltage Line Regulation (V CC = 3.0 V to 0 V) MC3303, MC303 MC3303V, NCV3303 V th.. Reg line Input Bias Current ( = 0 V) I IB 0 00 na TOTAL DEVICE Supply Current (V CC =.0 V to 0 V, C T =.0 nf, Pin = V CC, V Pin > V th, Pin = GND, remaining pins open) V mv I CC.0 ma. T low = 0 C for MC303, SC303; 0 C for MC3303, SC3303, MC3303V, NCV3303 T high = 0 C for MC303, SC303; C for MC3303, SC3303; C for MC3303V, NCV3303. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as possible.. If the output switch is driven into hard saturation (non Darlington configuration) at low switch currents ( 300 ma) and high driver currents ( 30 ma), it may take up to.0 s for it to come out of saturation. This condition will shorten the off time at frequencies 30 khz, 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: IC output Forced of output switch : 0 I C driver.0 ma * * The 00 resistor in the emitter of the driver device requires about.0 ma before the output switch conducts. 3

4 I OFF TIME ( s) 0 0 V CC =.0 V, Pin = V CC Pin = GND, T A = C ON TIME ( s) OFF TIME ( s) FREQUENCY (khz) Ct, TIMING CAPACITOR CAPACITANCE (nf) Figure 3. Oscillator Frequency ON TIME ( s), FREQUENCY (khz) OSC, OSCILLATOR VOLTAGE (V) V V CC =.0 V Pin = V CC Pin = GND Pins,, = Open C T =.0 nf T A = C 0 s/div Figure. Timing Capacitor Waveform 00 mv/div CE(sat), SATURATION VOLTAGE (V) V V CC =.0 V. Pins,, = V CC Pins 3, = GND. T A = C (See Note ) I E, EMITTER CURRENT (A) CE(sat), SATURATION VOLTAGE (V) V V CC =.0 V Pin = V CC Pins, 3, = GND T A = C (See Note ) Darlington Connection Forced = I C, COLLECTOR CURRENT(A) Figure. Emitter Follower Configuration Output Saturation Voltage versus Emitter Current Figure. Common Emitter Configuration Output Switch Saturation Voltage versus Collector Current IPK(sense), CURRENT LIMIT SENSE VOLTAGE (V) V V CC =.0 V I chg = I dischg T A, AMBIENT TEMPERATURE ( C) Figure. Current Limit Sense Voltage versus Temperature CC, SUPPLY CURRENT (ma) C T =.0 nf Pin = V CC Pin = GND V CC, SUPPLY VOLTAGE (V) Figure. Standby Supply Current versus Supply Voltage. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as possible.

5 0 H L 0 S Q Q R Q V R sc V CC - I pk OSC Comp. C T. V Ref Reg 3 C T 00 pf N9 R. k R k.0 H V/ ma 330 C O 00 Optional Filter Test Conditions Results Line Regulation =.0 V to V, I O = ma 30 mv = ±0.0% Load Regulation = V, I O = ma to ma 0 mv = ±0.0% Output Ripple = V, I O = ma 00 mvpp Efficiency = V, I O = ma.% Output Ripple With Optional Filter = V, I O = ma 0 mvpp Figure 9. Step Up Converter

6 R R sc R sc R 0 for constant Figure 0. External Current Boost Connections for I C Peak Greater than. A 9a. External NPN Switch 9b. External NPN Saturated Switch (See Note ). If the output switch is driven into hard saturation (non Darlington configuration) at low switch currents ( 300 ma) and high driver currents ( 30 ma), it may take up to.0 s to come out of saturation. This condition will shorten the off time at frequencies 30 khz, 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.

7 S R Q Q Q R sc 0.33 V 00 V CC I pk OSC - Comp. C T. V Ref Reg N9 3 C L T 0 pf 0 H R. k R 3. k 0 C O.0 V/00 ma.0 H 00 Optional Filter Test Conditions Results Line Regulation = V to V, I O = 00 ma mv = ±0.% Load Regulation = V, I O = 0 ma to 00 ma 3.0 mv = ±0.03% Output Ripple = V, I O = 00 ma 0 mvpp Short Circuit Current = V, R L = 0.. A Efficiency = V, I O = 00 ma 3.% Output Ripple With Optional Filter = V, I O = 00 ma 0 mvpp Figure. Step Down Converter V R sc R sc Figure. External Current Boost Connections for I C Peak Greater than. A a. External NPN Switch b. External PNP Saturated Switch

8 S Q Q R Q R sc 0.. V to.0 V 00 V CC I pk OSC Comp. - C T. V Ref Reg 3 L H 00 pf N9 R. k R f C O.0 H - V/00 ma 00 Optional Filter Test Conditions Results Line Regulation =. V to.0 V, I O = 00 ma 3.0 mv = ±0.0% Load Regulation =.0 V, I O = 0 ma to 00 ma 0.0 V = ±0.09% Output Ripple =.0 V, I O = 00 ma 00 mvpp Short Circuit Current =.0 V, R L = ma Efficiency =.0 V, I O = 00 ma.% Output Ripple With Optional Filter =.0 V, I O = 00 ma 0 mvpp Figure 3. Voltage Inverting Converter 3 3 Figure. External Current Boost Connections for I C Peak Greater than. A 3a. External NPN Switch 3b. External PNP Saturated Switch

9 Figure. Printed Circuit Board and Component Layout (Circuits of Figures 9,, 3) INDUCTOR DATA Converter Inductance ( H) Turns/Wire Step Up 0 3 Turns of # AWG Step Down 0 Turns of # AWG Voltage Inverting Turns of # AWG All inductors are wound on Magnetics Inc. toroidal core. 9

10 Figure. Printed Circuit Board for DFN Device 0

11 Calculation Step Up Step Down Voltage Inverting t on /t off V V F in(min) V (min) sat V F (min) V sat V F V sat (t on t off ) f f f t off ton t off t on t off t on t off t on t off t on t off t on t off t on (t on t off ) t off (t on t off ) t off (t on t off ) t off C T.0 x 0 t on.0 x 0 t on.0 x 0 t on I pk(switch) I out(max) t on t off I out(max) I out(max) t on t off R sc 0.3/I pk(switch) 0.3/I pk(switch) 0.3/I pk(switch) L (min) ((min) V sat ) I pk(switch) t on(max) ((min) V sat ) I pk(switch) t on(max) ((min) V sat ) I pk(switch) t on(max) C O 9 I out t on I (t pk(switch) on t ) off 9 V ripple(pp) V ripple(pp) I out t on V ripple(pp) V sat = Saturation voltage of the output switch. V F = Forward voltage drop of the output rectifier. The following power supply characteristics must be chosen: Nominal input voltage. Desired output voltage, I out Desired output current.. R R f min Minimum desired output switching frequency at the selected values of and I O. V ripple(pp) Desired peak to peak output ripple voltage. In practice, the calculated capacitor value will need to be increased due to its equivalent series resistance and board layout. The ripple voltage should be kept to a low value since it will directly affect the line and load regulation. NOTE: For further information refer to Application Note AN90A/D and AN9/D. Figure. Design Formula Table

12 ORDERING INFORMATION Device Package Shipping MC3303AD SOIC 9 Units / Rail MC3303ADG SOIC 9 Units / Rail MC3303ADR SOIC 00 Units / Tape & Reel MC3303ADRG SC3303ADRG SOIC SOIC 00 Units / Tape & Reel 00 Units / Tape & Reel MC3303AP PDIP 0 Units / Rail MC3303APG PDIP 0 Units / Rail MC3303AVD SOIC 9 Units / Rail MC3303AVDG MC3303AVDR MC3303AVDRG NCV3303AVDR* NCV3303AVDRG* SOIC SOIC SOIC SOIC SOIC 9 Units / Rail 00 Units / Tape & Reel MC3303AVP PDIP 0 Units / Rail MC3303AVPG PDIP 0 Units / Rail MC303AD SOIC 9 Units / Rail MC303ADG SOIC 9 Units / Rail MC303ADR SOIC 00 Units / Tape & Reel MC303ADRG SC303ADRG SOIC SOIC 00 Units / Tape & Reel 00 Units / Tape & Reel MC303AP PDIP 0 Units / Rail MC303APG PDIP 0 Units / Rail SC303APG PDIP 0 Units / Rail MC3303MNTXG DFN 000 Units / Tape & Reel For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specification Brochure, BRD0/D. *NCV3303A: T low = 0 C, T high = C. Guaranteed by design. NCV prefix is for automotive and other applications requiring site and change control.

13 PACKAGE DIMENSIONS X B Y A S 0. (0.00) M Y M SOIC NB CASE 0 ISSUE AJ K NOTES:. DIMENSIONING AND TOLERANCING PER ANSI Y.M, 9.. CONTROLLING DIMENSION: MILLIMETER. 3. DIMENSION A AND B DO NOT INCLUDE MOLD PROTRUSION.. MAXIMUM MOLD PROTRUSION 0. (0.00) PER SIDE.. DIMENSION D DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0. (0.00) TOTAL IN EXCESS OF THE D DIMENSION AT MAXIMUM MATERIAL CONDITION.. 0 THRU 0 ARE OBSOLETE. NEW STANDARD IS 0. Z H G D C 0. (0.00) M Z Y S X S SEATING PLANE 0.0 (0.00) N X M J MILLIMETERS INCHES DIM MIN MAX MIN MAX A B C D G. BSC 0.00 BSC H J K M 0 0 N S SOLDERING FOOTPRINT* SCALE : mm inches *For additional information on our Pb Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. 3

14 PACKAGE DIMENSIONS PDIP P, P SUFFIX CASE 0 ISSUE M D D A E NOTES:. DIMENSIONING AND TOLERANCING PER ASME Y.M, 99.. CONTROLLING DIMENSION: INCHES. 3. DIMENSION E IS MEASURED WITH THE LEADS RE- STRAINED PARALLEL AT WIDTH E.. DIMENSION E DOES NOT INCLUDE MOLD FLASH.. ROUNDED CORNERS OPTIONAL. NOTE F TOP VIEW e/ A E c E END VIEW NOTE 3 INCHES DIM MIN NOM MAX A 0.0 A 0.0 b C D D 0.00 E MILLIMETERS MIN NOM MAX E E BSC. BSC E e 0.00 BSC. BSC L L A e SIDE VIEW C SEATING PLANE X b 0.00 M C A E3 END VIEW

15 PACKAGE DIMENSIONS DFN, x CASE AF 0 ISSUE C X X PIN ONE REFERENCE X NOTE D ÉÉÉ ÉÉÉ C C C C TOP VIEW DETAIL B (A3) A SIDE VIEW A B E A C SEATING PLANE L EXPOSED Cu L DETAIL A OPTIONAL CONSTRUCTIONS MOLD CMPD A DETAIL B ALTERNATE CONSTRUCTIONS L ÇÇ A3 NOTES:. DIMENSIONS AND TOLERANCING PER ASME Y.M, 99.. CONTROLLING DIMENSION: MILLIMETERS. 3. DIMENSION b APPLIES TO PLATED TERMINAL AND IS MEASURED BETWEEN 0. AND 0.30MM FROM TERMINAL TIP.. COPLANARITY APPLIES TO THE EXPOSED PAD AS WELL AS THE TERMINALS.. DETAILS A AND B SHOW OPTIONAL CONSTRUCTIONS FOR TERMINALS. MILLIMETERS DIM MIN MAX A A A3 0.0 REF b D.00 BSC D.9. E.00 BSC E e 0.0 BSC K 0.0 L L 0. DETAIL A D X L SOLDERING FOOTPRINT*. X 0.3 E K e BOTTOM VIEW X b 0.0 C 0.0 C A B NOTE PITCH X 0.3 PACKAGE OUTLINE DIMENSIONS: MILLIMETERS *For additional information on our Pb Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. SENSEFET is a trademark of Semiconductor Components Industries, LLC. ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. Typical parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including Typicals must be validated for each customer application by customer s technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner. PUBLICATION ORDERING INFORMATION LITERATURE FULFILLMENT: Literature Distribution Center for ON Semiconductor P.O. Box 3, Denver, Colorado 0 USA Phone: 303 or Toll Free USA/Canada Fax: 303 or Toll Free USA/Canada orderlit@onsemi.com N. American Technical Support: 00 9 Toll Free USA/Canada Europe, Middle East and Africa Technical Support: Phone: Japan Customer Focus Center Phone: ON Semiconductor Website: Order Literature: For additional information, please contact your local Sales Representative MC303A/D