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| HT74XX Negative Voltage Regulator Features * * * Low power consumption Low voltage drop Low temperature coefficient * * * High input voltage (up to -24V) High output current : 100mA (Pd 250mW) TO-92 and SOT-89 package Applications * * Battery-powered equipment Communication equipment * Audio/Video equipment General Description The HT74XX series is a set of three-terminal high current high voltage regulator implemented in CMOS technology. They can deliver 100mA output current and allow an input voltage as high as -24V. They are available with several fixed output voltages ranging from -2.4V to -15V. CMOS technology ensures low voltage drop and low quiescent current. Although designed primarily as fixed voltage regulators, these devices can be used with external components to obtain variable voltages and currents. Selection Table Part No. HT7430 HT7450 Output Voltage -3.0V -5.0V Tolerance 5% 5% 1 January 26, 2000 HT74XX Block Diagram VIN ref Pin Assignment TO-92 HT74XX Front View SOT-89 VOUT GND VIN GND VIN VOUT GND VOUT Bottom View Pad Assignment Pad Coordinates Pad No. 1 (0 ,0 ) Unit: mm X Y -578.00 -545.50 -545.50 -571.75 175.75 592.25 2 3 1 2 3 Chip size: 1550 1562 (mm)2 * The IC substrate should be connected to VDD in the PCB layout artwork. Absolute Maximum Ratings Supply Voltage.............................+0.3V to -26V Power Consumption.............................. 250mW Storage Temperature.................-50C to 125C Operating Temperature ..................0C to 70C Note: These are stress ratings only. Stresses exceeding the range specified under Absolute Maximum Ratings may cause substantial damage to the device. Functional operation of this device at other conditions beyond those listed in the specification is not implied and prolonged exposure to extreme conditions may affect device reliability. VOUT V IN GND 2 January 26, 2000 HT74XX Electrical Characteristics HT7430, -3.0V output type Symbol VOUT IOUT DVOUT VDIF ISS DVOUT DVIN VOUT VIN DVOUT DTa Parameter Test Conditions VIN -5V 3/4 Conditions 3/4 IOUT=1mA -4VVIN-12V IOUT=1mA 3/4 IOUT=10mA 0C HT7450, -5.0V output type Symbol VOUT IOUT DVOUT VDIF ISS DVOUT DVIN VOUT VIN DVOUT DTa Parameter Output Voltage Output Current Load Regulation Voltage Drop Current Consumption Line Regulation Input Voltage Temperature Coefficient Test Conditions VIN -7V 3/4 Conditions 3/4 IOUT=1mA -6VVIN-15V IOUT=1mA 3/4 IOUT=10mA 0C 3 January 26, 2000 HT74XX Application Circuits Basic circuit V IN V C1 10mF IN 0 6%":: S e r ie s V GND OUT V C2 10mF OUT C om m on S in g le p o in t G N D C om m on High output current positive voltage regulator T r1 V V R1 C1 10mF IN IN 0 6%":: S e r ie s V GND OUT V OUT C2 10mF C om m on S in g le p o in t G N D C om m on Short-Circuit protection by Tr1 V IN Rs T r1 V R1 C1 10mF IN 0 6%":: 5 A H EA I V GND OUT V OUT C2 10mF C om m on S in g le p o in t G N D C om m on 4 January 26, 2000 HT74XX Circuit for increasing output voltage V IN V C1 10mF IN 0 6%":: S e r ie s GND IS S V OUT V OUT C2 10mF V XX R1 R2 C om m on S in g le p o in t G N D C om m on VOUT = VXX ( 1 + Circuit for increasing output voltage R2 ) + I SS R2 R1 V IN V C1 10mF IN 0 6%":: S e r ie s GND V OUT V OUT C2 10mF V XX R1 IS S D1 C om m on S in g le p o in t G N D C om m on VOUT = VXX + VD1 Constant current regulator V V C1 10mF V IN IN 0 6%":: S e r ie s GND IS S OUT C2 10mF V XX R A IO UT R L C om m on I OUT = VXX + I SS RA 5 January 26, 2000 HT74XX Dual supply IC 1 V IN V IN 0 6%":: S e r ie s GND V OUT V C3 10mF OUT IC 2 V C1 10mF C om m on IN 0 6%":: S e r ie s V GND OUT V C2 10mF R1 OUT C om m on 6 January 26, 2000 HT74XX Holtek Semiconductor Inc. (Headquarters) No.3 Creation Rd. II, Science-based Industrial Park, Hsinchu, Taiwan, R.O.C. Tel: 886-3-563-1999 Fax: 886-3-563-1189 Holtek Semiconductor Inc. (Taipei Office) 5F, No.576, Sec.7 Chung Hsiao E. Rd., Taipei, Taiwan, R.O.C. Tel: 886-2-2782-9635 Fax: 886-2-2782-9636 Fax: 886-2-2782-7128 (International sales hotline) Holtek Semiconductor (Hong Kong) Ltd. RM.711, Tower 2, Cheung Sha Wan Plaza, 833 Cheung Sha Wan Rd., Kowloon, Hong Kong Tel: 852-2-745-8288 Fax: 852-2-742-8657 Copyright a 2000 by HOLTEK SEMICONDUCTOR INC. The information appearing in this Data Sheet is believed to be accurate at the time of publication. However, Holtek assumes no responsibility arising from the use of the specifications described. The applications mentioned herein are used solely for the purpose of illustration and Holtek makes no warranty or representation that such applications will be suitable without further modification, nor recommends the use of its products for application that may present a risk to human life due to malfunction or otherwise. Holtek reserves the right to alter its products without prior notification. For the most up-to-date information, please visit our web site at http://www.holtek.com.tw. 7 January 26, 2000 |
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