150kHz 3A BUCK DC-DC CONVERTER General Description. Features. Applications

Transcription

1 General Description The series of regulators are fixed frequency PWM buck (step-down) DC/DC converter, capable of driving a A load with excellent line and load regulation. These regulators include internal frequency compensation and a fixed frequency oscillator so that they are easy to use. A system adopting requires a minimum number of external components to work. A standard series of inductors, optimized for use with the series, are available from several manufacturers. This feature greatly simplifies the design of switch-mode power supplies. These ICs are available in TO-0- and TO-6- packages. Features.V, V, V Fixed (±% Tolerance) and Adjustable (±% Tolerance) Output Versions Guaranteed A Output Load Current 0kHz Fixed Frequency Internal Oscillator Input Voltage Range up to V Requires only external components High Efficiency up to 90% Excellent Line and Load Regulation TTL Shutdown Capability Low Power Standby Mode, I Q Typically 80µA Built-in Current Limit Protection and Thermal Shutdown Circuit Applications LCD Monitor and LCD TV On-Card DC-DC Converter DVD Recorder PDP TO-0- TO-6- Figure. Package Types of

2 Pin Configuration T Package (TO-0-) S Package (TO-6-) ON/OFF FEEDBACK GND OUTPUT ON/OFF FEEDBACK GND OUTPUT Metal Tab GND Metal Tab GND Figure. Pin Configuration of (Top View) Pin Description Pin Number Pin Name Function Unregulated input voltage OUTPUT Switch driver output GND Ground FEEDBACK Feedback Pin. For fixed version, connect it to system output. For adjustable version, connect it with an external resistor and capacitor feedback network to program the system output voltage ON/OFF The TTL logic compatible input to control the regulator on or off

3 Functional Block Diagram ON/OFF.V REFERENCE.V REGULATOR START UP 0 mv 00 mv.ω Bias Current.V Frequency Shift COMP + _ 0KHz OSC _ COMP + FEEDBACK R + _ EA + COMP _ LATCH DRIVER & INV :00 OUTPUT R For.V V V ADJ R=.9kΩ R=.8kΩ R=.9kΩ R=7.7kΩ R=.9kΩ R=.8kΩ R=Open R=0Ω THERMAL SHUTDOWN GND Figure. Functional Block Diagram of

4 Ordering Information - Circuit Type Package T: TO-0- S: TO-6- E: Lead Free G: Green TR: Tape and Reel Blank: Tube ADJ: Adjustable Output.: Fixed Output.V.0: Fixed Output.0V : Fixed Output V Package TO-0- TO-6- Temperature Range -0 to 8 o C -0 to 8 o C Part Number Marking ID Packing Lead Free Green Lead Free Green Type T-ADJE T-ADJG T-ADJE T-ADJG Tube T-.E T-.G T-.E T-.G Tube T-.0E T-.0G T-.0E T-.0G Tube T-E T-G T-E T-G Tube S-ADJE S-ADJG S-ADJE S-ADJG Tube S-ADJTRE S-ADJTRG S-ADJE S-ADJG Tape & Reel S-.E S-.G S-.E S-.G Tube S-.TRE S-.TRG S-.E S-.G Tape & Reel S-.0E S-.0G S-.0E S-.0G Tube S-.0TRE S-.0TRG S-.0E S-.0G Tape & Reel S-E S-G S-E S-G Tube S-TRE S-TRG S-E S-G Tape & Reel BCD Semiconductor's Pb-free products, as designated with "E" suffix in the part number, are RoHS compliant. Products with "G" suffix are available in green packages.

5 Absolute Maximum Ratings (Note ) Parameter Symbol Value Unit Input Voltage 0 V ON/OFF Pin Voltage V ON/OFF 0 V Feedback Pin Voltage V FB 0 V Operating Junction Temperature T J 0 o C Thermal Resistance (Junction to Ambient, No Heatsink) TO-0- TO-6- R θja 60 o C/W Lead Temperature (Soldering, 0sec) T LEAD 60 o C Storage Temperature Range T STG -6 to 0 o C Note : Stresses greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "Recommended Operating Conditions" is not implied. Exposure to "Absolute Maximum Ratings" for extended periods may affect device reliability. Recommended Operating Conditions Parameter Symbol Value Unit Maximum Input Voltage (Note ).V.0V V ADJ (V OUT =.V) ADJ (V OUT =.V) V Operating Junction Temperature T J -0 to o C Note : For ADJ version, the recommended supply voltage depends on the needed output voltage.

6 Electrical Characteristics For.V Output Voltage Version Unless otherwise specified, T J = o C. The specifications with boldface type apply over Full Operating Junction Temperature Range. Parameter Symbol Conditions Min Typ Max Unit Output Voltage V OUT.V V, 0.A I LOAD A V Efficiency η =V, I LOAD =A 7 % For V Output Voltage Version Unless otherwise specified, T J = o C. The specifications with boldface type apply over Full Operating Junction Temperature Range. Parameter Symbol Conditions Min Typ Max Unit Output Voltage V OUT 7V V, 0.A I LOAD A V Efficiency η =V, I LOAD =A 80 % For V Output Voltage Version Unless otherwise specified, T J = o C. The specifications with boldface type apply over Full Operating Junction Temperature Range. Parameter Symbol Conditions Min Typ Max Unit Output Voltage V OUT V V, 0.A I LOAD A V Efficiency η =V, I LOAD =A 88 % For ADJ Output Voltage Version Unless otherwise specified, T J = o C. The specifications with boldface type apply over Full Operating Junction Temperature Range. Parameter Symbol Conditions Min Typ Max Unit Feedback Voltage V FB 0.A I LOAD A,.V V, V OUT programmed for.v V Efficiency η =V, I LOAD =A, V OUT =.V 7 % 6

7 Electrical Characteristics (Continued) For All Output Voltage Versions Unless otherwise specified, =V for.v, V and adjustable version, =V for V version, I LOAD =00mA, T J = o C. Specifications with boldface type apply over Full Operating Junction Temperature Range. Parameter Symbol Conditions Min Typ Max Unit Feedback Bias Current I FB Adjustable Version Only, V FB =.V na Oscillator Frequency f (Note ) khz Saturation Voltage V SAT I LOAD =A ( No output devices, V FB =0V)...6 V Maximum Duty Cycle D MAX V FB =0V 00 % Minimum Duty Cycle D MIN V FB =.V 0 % Current Limit I CL Peak Current, No output devices, V FB =0V A Output Leakage Current I SWL Output=0V, No output devices, V FB =.V, =V Output=-V, No output devices, V FB =.V, =V 0 µa 0 ma Quiescent Current I Q V FB =.V 0 ma Standby Quiescent Current I STBY ON/OFF Pin=V, =8V µa ON/OFF Pin Logic Input Threshold Voltage V IL Regulator ON 0.6 V IH Regulator OFF.0 V ON/OFF Pin Input Current I H V PIN =.V (Regulator OFF) µa I L V PIN =0.V (Regulator ON) 0.0 µa Note : The switching frequency is reduced when the second stage current limit is activated. Note : The specifications with boldface are GBD (Guaranteed By Design ). 7

8 Typical Performance Characteristics Efficiency (%) Efficiency (%) V Version 6. =V, T J = O C Output Current (A) 6.0.0V Version 6. =V, T J = O C Output Current (A) Figure. Efficiency vs. Output Current Figure. Efficiency vs. Output Current Efficiency (%) Output Current (A) V Version =V,T J = o C efficiency (%) ADJ Version (V OUT Regulated to.v) =0V, T J = O C Output Current (A) Figure 6. Efficiency vs. Output Current Figure 7. Efficiency vs. Output Current 8

9 Typical Performance Characteristics (Continued) Efficiency (%) I OUT =A, T J = O C 67..V Version 6.0.0V Version V Version 6. ADJ Version (V OUT =.V) Input Voltage (V) Output Voltage Change (%) T J = O C Input Voltage (V) V OUT =.0V I LOAD =0.A Figure 8. Efficiency vs. Input Voltage Figure 9. Line Regulation Output Voltage (V) V.96 IN =V, V OUT =.0V T J = O C Output Current (A) Switch Saturation Voltage (V) Switch Current (A) =V, T J = O C Figure 0. Load Regulation Figure. Switch Saturation Voltage vs. Switch Current 9

10 Typical Performance Characteristics (Continued) Switch Current Limit (A) Quiescent Current (ma) =V Junction Temperature ( O C) 0. T J = O C V ON/OFF =0, Switch Off Supply Voltage (V) Figure. Switch Current Limit vs. Junction Temperature Figure. Quiescent Current vs. Supply Voltage Quiescent Current (ma) Junction Temperature ( o C) =V V ON/OFF =0V, Switch OFF Shutdown Quiescent Current (µa) T J = O C V ON/OFF =V Supply Voltage (V) Figure. Quiescent Current vs. Junction Temperature Figure. Shutdown Quiescent Current vs. Input Voltage 0

11 Typical Performance Characteristics (Continued) ON/OFF Voltage (V) OFF ON ON/OFF Pin Current (µa) =V Junction Temperature ( O C) =V, T J = O C ON/OFF Pin Voltage (V) Figure 6. On/Off Threshold Voltage vs. Junction Temperature Figure 7. On/Off Pin Current vs. On/Off Pin Voltage 60 6 Frequency (khz) Junction Temperature ( O C) Figure 8. Switching Frequency vs. Junction Temperature

12 Typical Application FEEDBACK -.V OUTPUT L µh Regulated DC Output A Load C IN 70µF D N8 + GND ON/OFF + C OUT 0µF L: Sumida CDRH7/LDNP-0MC or Equivalent Figure 9. Typical Application of -.V V Unregulated DC Input FEEDBACK -.0V OUTPUT L µh Regulated DC Output A Load C IN 70µF + GND ON/OFF + D N8 C OUT 0µF L: Sumida CDRH7/LDNP-0MC or Equivalent Figure 0. Typical Application of -.0V

13 Typical Application (Continued) V Unregulated DC Input FEEDBACK -V OUTPUT L µh Regulated DC Output A Load C IN 70µF D N8 + GND ON/OFF + C OUT 0µF L: Sumida CDRH7/LDNP-0MC or Equivalent Figure 9. Typical Application of -V R.6k R.69k V Unregulated DC Input C IN 70µF FEEDBACK -ADJ OUTPUT L µh + GND ON/OFF + C OUT D N8 C FF nf 0µF.V Regulated DC Output A Load V OUT =. * (R+R) R L: Sumida CDRH7/LDNP-0MC or Equivalent Figure 0. Typical Application of -ADJ

14 Mechanical Dimensions TO-0- Unit: mm(inch).90(0.0).890(0.) 9.80(0.88) 0.0(0.00).790(0.9).890(0.).70(0.06).70(0.0).70(0.76).670(0.8).760(0.6).60(0.79) 0.70(0.08) 0.90(0.06) 8.00(0.) 8.600(0.9).00(0.).900(0.7).0(0.099).80(0.) 6.700(0.6) 6.900(0.7).700(0.067) TYP 0.0(0.0) 0.0(0.0)

15 Mechanical Dimensions (Continued) TO-6- Unit: mm(inch).60 (0.06).760 (0.069) (0.89) 0.80 (0.0).70 (0.76).670 (0.8).70 (0.06).70 (0.0).600 (0.0) REF 8.00 (0.) (0.9).080 (0.00).80 (0.6).0 (0.96).0 (0.6) (0.000) 0.0 (0.006) 0.70 (0.08) 0.90 (0.06).700 (0.067) TYP (0.6) (0.7) 0.0 (0.0) 0.0 (0.0).0 (0.09).70 (0.08)

16 IMPORTANT NOTICE reserves the right to make changes without further notice to any products or specifications herein. does not assume any responsibility for use of any its products for any particular purpose, nor does assume any liability arising out of the application or use of any its products or circuits. does not convey any license under its patent rights or other rights nor the rights of others. MAIN SITE BCD - Headquarters Semiconductor Manufacturing Limited - Wafer BCD FabSemiconductor Manufacturing Limited BCD - Wafer Semiconductor Fab Manufacturing Limited Shanghai - IC Design SIM-BCD Group Semiconductor Manufacturing Co., Ltd. No. Shanghai 600, Zi SIM-BCD Xing Road, Semiconductor Shanghai ZiZhu Manufacturing Science-based Limited Industrial Park, 00, China 800 Yi Advanced Shan Road, Analog Shanghai Circuits 00, (Shanghai) China Corporation Tel: 800, , Yi Shan Road, Shanghai Fax: , China Tel: F, Zone B, 900, 9, Yi Fax: Shan Road, Shanghai , China Tel: , Fax: Tel: , Fax: REGIONAL SALES OFFICE REGIONAL Shenzhen OfficeSALES OFFICE Shenzhen Shanghai SIM-BCD Office Semiconductor Manufacturing Co., Ltd., Shenzhen Office Shanghai Unit A Room SIM-BCD 0, Skyworth Semiconductor Bldg., Gaoxin Manufacturing Ave..S., Nanshan Co., Ltd. District, Shenzhen Shenzhen, Office Advanced China Analog Circuits (Shanghai) Corporation Shenzhen Office Taiwan Office BCD Taiwan Semiconductor Office (Taiwan) Company Limited F, 98-, BCD Rui Semiconductor Guang Road, (Taiwan) Nei-Hu District, Company Taipei, Limited Taiwan F, 98-, Rui Guang Road, Nei-Hu District, Taipei, USA Office USA BCD Office Semiconductor Corp. BCD 090 Semiconductor Huntwood Ave. Corporation Hayward, 090 CA 9, Huntwood USA Ave. Hayward, Room Tel: E, F, Noble 79 Center, No.006, rd Fuzhong Road, Futian District, Shenzhen 806, China Tel: Taiwan 808 CA Tel : 9, U.S.A Tel: Fax: Fax: Fax: Tel: Fax: Tel Fax: : Fax: