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| HT77XX PFM Step-up DC/DC Converter Technical Document * Tools Information * FAQs * Application Note Features * Low start-up voltage: 0.6V (Typ.) * High efficiency: 85% (Typ.) * High output voltage accuracy: 2.5% * Output voltage: 2.7V, 3.0V, 3.3V, 3.7V, 5.0V * Ultra low supply current IDD2: 4mA (Typ.) * Low ripple and low noise * Low shutdown current: 0.5mA (Typ.) * TO-92, SOT-89 and SOT-25 package Applications * Palmtops/PDAs * Portable communicators/Smartphones * Cameras/Camcorders * Battery-powered equipment General Description The HT77XX series is a set of PFM step-up DC/DC converter with high efficiency and low ripple. The series features extremely low start-up voltage and high output voltage accuracy. They require only three external components to provide a fixed output voltage of 2.7V, 3.0V, 3.3V, 3.7V or 5.0V. CMOS technology ensures ultra low supply current and makes them ideal for battery-operated applications powered from one or more cells. The HT77XX consists of an oscillator, a PFM control circuit, a driver transistor, a reference voltage unit, and a high speed comparator. They employ pulse frequency modulation (PFM) for minimum supply current and ripple at light output loading. These devices are available in space saving TO-92, SOT-89 and SOT-25 packages. For SOT-25 package, it also build-in a chip enable function to reduce power consumption during shutdown mode. Selection Table Part No. HT7727 HT7730 HT7733 HT7737 HT7750 Note: XX stands for output voltages. Only lead free devices are available. # stands for lead free devices. For the TO-92 package, there will be a # mark at the end of the date code. Output Voltage 2.7V 3.0V 3.3V 3.7V 5.0V TO-92 SOT-89 SOT-25 HT77XX (for TO-92) HT77XX# (for SOT-89) 77XX# (for SOT-25) Package Marking Rev 1.10 1 March 7, 2006 HT77XX Block Diagram V re f LX B u ffe r PFM C o n tro l VOUT O S C 115kH z C h ip E n a b le GND CE Pin Assignment T O -9 2 S O T -8 9 S O T -2 5 LX 5 H T77XX 1 G N D VO U T LX GND 2 VOUT 3 LX 1 CE GND 4 H T77XX 1 2 3 F r o n t V ie w 77XX T o p V ie w 2 VOUT 3 NC B o tto m V ie w CE VOUT NC GND VOUT LX Pin Description Pin No. TO-92 3/4 2 3/4 1 3 SOT-25 1 2 3 4 5 SOT-89 3/4 2 3/4 1 3 Pin Name CE VOUT NC GND LX Chip enable pin, high active DC/DC converter output monitoring pin No connection Ground pin Switching pin Description Absolute Maximum Ratings Supply Voltage ..............................VSS-0.3V to VSS+7V Power Consumption (*1) .................................. 500mW Power Consumption (*2) .................................. 250mW 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. *1: applied to SOT-89 and TO-92 *2: applied to SOT-25 Storage Temperature ............................-50C to 125C Operating Temperature...............................0C to 70C Rev 1.10 2 March 7, 2006 HT77XX Electrical Characteristics HT7727, +2.7V Output Type Symbol VOUT VIN VSTART VHOLD IIN IDD1 IDD2 ISHDN ILEAK fOSC h DOSC Parameter Output Voltage Input Voltage Start-up Voltage Minimum Hold-on Voltage No load Input Current Supply Current 1 Supply Current 2 Shutdown Current LX Leakage Current Maximum Oscillator Frequency Efficiency Oscillator Duty Cycle VIN=VOUT0.6; IOUT=10mA; Ta=25C (Unless otherwise specified) Test Conditions 3/4 3/4 VIN: 0(R)2V; IOUT=1mA VIN: 2(R)0V; IOUT=1mA Measured at no load VIN=VOUT0.95 Measured at VOUT pin VIN=VOUT+0.5V Measured at VOUT pin VCE=VIL, VIN=VOUT0.95 VIN=6V VIN=VOUT0.95 Measured at LX pin 3/4 VIN=VOUT0.95 Measured at LX pin Min. 2.633 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 65 Typ. 2.7 3/4 0.6 3/4 10 40 4 0.5 3/4 115 85 75 Max. 2.767 6 0.7 0.7 3/4 3/4 7 3/4 0.9 3/4 3/4 85 Unit V V V V mA mA mA mA mA kHz % % HT7730, +3.0V Output Type Symbol VOUT VIN VSTART VHOLD IIN IDD1 IDD2 ISHDN ILEAK fOSC h DOSC Parameter Output Voltage Input Voltage Start-up Voltage Min. Hold-on Voltage No load Input Current Supply Current 1 Supply Current 2 Shutdown Current LX Leakage Current Maximum Oscillator Frequency Efficiency Oscillator Duty Cycle VIN=VOUT0.6; IOUT=10mA; Ta=25C (Unless otherwise specified) Test Conditions 3/4 3/4 VIN: 0(R)2V; IOUT=1mA VIN: 2(R)0V; IOUT=1mA Measured at no load VIN=VOUT0.95 Measured at VOUT pin VIN=VOUT+0.5V Measured at VOUT pin VCE=VIL, VIN=VOUT0.95 VIN=6V VIN=VOUT0.95 Measured at LX pin 3/4 VIN=VOUT0.95 Measured at LX pin Min. 2.925 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 65 Typ. 3 3/4 0.6 3/4 10 48 4 0.5 3/4 115 85 75 Max. 3.075 6 0.7 0.7 3/4 3/4 7 3/4 0.9 3/4 3/4 85 Unit V V V V mA mA mA mA mA kHz % % Rev 1.10 3 March 7, 2006 HT77XX HT7733, +3.3V Output Type Symbol VOUT VIN VSTART VHOLD IIN IDD1 IDD2 ISHDN ILEAK fOSC h DOSC Parameter Output Voltage Input Voltage Start-up Voltage Min. Hold-on Voltage No load Input Current Supply Current 1 Supply Current 2 Shutdown Current LX Leakage Current Maximum Oscillator Frequency Efficiency Oscillator Duty Cycle VIN=VOUT0.6; IOUT=10mA; Ta=25C (Unless otherwise specified) Test Conditions 3/4 3/4 VIN: 0(R)2V; IOUT=1mA VIN: 2(R)0V; IOUT=1mA Measured at no load VIN=VOUT0.95 Measured at VOUT pin VIN=VOUT+0.5V Measured at VOUT pin VCE=VIL, VIN=VOUT0.95 VIN=6V VIN=VOUT0.95 Measured at LX pin 3/4 VIN=VOUT0.95 Measured at LX pin Min. 3.218 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 65 Typ. 3.3 3/4 0.6 3/4 10 60 4 0.5 3/4 115 85 75 Max. 3.382 6 0.7 0.7 3/4 3/4 7 3/4 0.9 3/4 3/4 85 Unit V V V V mA mA mA mA mA kHz % % HT7737, +3.7V Output Type Symbol VOUT VIN VSTART VHOLD IIN IDD1 IDD2 ISHDN ILEAK fOSC h DOSC Parameter Output Voltage Input Voltage Start-up Voltage Min. Hold-on Voltage No load Input Current Supply Current 1 Supply Current 2 Shutdown Current LX Leakage Current Maximum Oscillator Frequency Efficiency Oscillator Duty Cycle VIN=VOUT0.6; IOUT=10mA; Ta=25C (Unless otherwise specified) Test Conditions 3/4 3/4 VIN: 0(R)2V; IOUT=1mA VIN: 2(R)0V; IOUT=1mA Measured at no load VIN=VOUT0.95 Measured at VOUT pin VIN=VOUT+0.5V Measured at VOUT pin VCE=VIL, VIN=VOUT0.95 VIN=6V VIN=VOUT0.95 Measured at LX pin 3/4 VIN=VOUT0.95 Measured at LX pin Min. 3.608 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 65 Typ. 3.7 3/4 0.6 3/4 10 64 4 0.5 3/4 115 85 75 Max. 3.793 6 0.7 0.7 3/4 3/4 7 3/4 0.9 3/4 3/4 85 Unit V V V V mA mA mA mA mA kHz % % Rev 1.10 4 March 7, 2006 HT77XX HT7750, +5.0V Output Type Symbol VOUT VIN VSTART VHOLD IIN IDD1 IDD2 ISHDN ILEAK fOSC h DOSC Parameter Output Voltage Input Voltage Start-up Voltage Min. Hold-on Voltage Current Consumption Supply Current 1 Supply Current 2 Shutdown Current LX Leakage Current Maximum Oscillator Frequency Efficiency Oscillator Duty Cycle VIN=VOUT0.6; IOUT=10mA; Ta=25C (Unless otherwise specified) Test Conditions 3/4 3/4 VIN: 0(R)2V; IOUT=1mA VIN: 2(R)0V; IOUT=1mA Measured at no load VIN=VOUT0.95 Measured at VOUT pin VIN=VOUT+0.5V Measured at VOUT pin VCE=VIL, VIN=VOUT0.95 VIN=6V VIN=VOUT0.95 Measured at LX pin 3/4 VIN=VOUT0.95 Measured at LX pin Min. 4.875 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 65 Typ. 5 3/4 0.7 3/4 10 85 4 0.5 3/4 115 85 75 Max. 5.125 6 0.8 0.7 3/4 3/4 7 3/4 0.9 3/4 3/4 85 Unit V V V V mA mA mA mA mA kHz % % Typical Performance Characteristics L=220mH, C=47mF 90 85 80 75 V 70 65 60 55 50 0 IN E ffic ie n c y ( % ) = 0 .9 V V IN = 1 .2 V V IN = 1 .5 V V IN = 1 .8 V V IN = 2 .0 V 10 20 30 40 50 60 70 80 90 100 O u tp u t C u rre n t (m A ) HT7730 Efficiency vs. Output Current Rev 1.10 5 March 7, 2006 HT77XX L=220mH, C=47mF 3 .1 3 2 .9 2 .8 O u tp u t V o lta g e ( V ) 2 .7 2 .6 2 .5 2 .4 2 .3 2 .2 2 .1 2 0 10 20 30 40 50 O u tp u t C u rre n t (m A ) 60 70 80 90 100 V IN = 0 .9 V V IN = 1 .2 V V IN = 1 .5 V V IN = 1 .8 V V IN = 2 .0 V HT7730 Output Voltage vs. Output Current L=220mH, C=47mF 150 140 130 120 110 100 90 80 70 60 50 40 -6 0 -4 0 -2 0 0 20 T e m p e ra tu re ( C ) 40 60 80 100 M a x im u m O s c illa to r F r e q u e n c y ( k H z ) HT7730 Maximum Oscillator Frequency vs. Temperature Rev 1.10 6 March 7, 2006 HT77XX Application Circuits 100mH V IN IN 5 8 1 9 V OUT S u m id a C D - 5 4 LX H T77XX S e r ie s GND VOUT 22mF T O -9 2 /S O T -8 9 100mH V IN IN 5 8 1 9 V OUT S u m id a C D - 5 4 LX CE H T77XX S e r ie s GND VOUT NC 22mF S O T -2 5 Note: For the SOT-25 package, when CE is pulled low, the internal blocks of the device, such as the reference band gap, gain block, and all feedback and control circuitry will be switched off. The boost converters output, VOUT, will be at a value one Schottky diode voltage drop below the input voltage and the LX pin remains in a high impedance condition. The output capacitor and load at VOUT determine the rate at which VOUT decays. Rev 1.10 7 March 7, 2006 HT77XX Package Information 3-pin TO-92 Outline Dimensions A B D C E F G H Symbol A B C D E F G H I a Dimensions in mil Min. 170 170 500 11 90 45 45 130 8 4 Nom. 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 Max. 200 200 3/4 20 110 55 65 160 18 6 Rev 1.10 8 March 7, 2006 HT77XX 3-pin SOT-89 Outline Dimensions A B I J E C D G F H Symbol A B C D E F G H I J Dimensions in mil Min. 173 64 90 35 155 14 17 3/4 55 14 Nom. 3/4 3/4 3/4 3/4 3/4 3/4 3/4 59 3/4 3/4 Max. 181 72 102 47 167 19 22 3/4 63 17 Rev 1.10 9 March 7, 2006 HT77XX 5-pin SOT-25 Outline Dimensions D C L E H e A2 b A1 A Symbol A A1 A2 b C D E e H L q Dimensions in mm Min. 1.00 3/4 0.70 0.35 0.10 2.70 1.40 3/4 2.60 0.37 1 Nom. 3/4 3/4 3/4 3/4 3/4 3/4 3/4 1.90 3/4 3/4 3/4 Max. 1.30 0.10 0.90 0.50 0.25 3.10 1.80 3/4 3 3/4 9 Rev 1.10 10 q March 7, 2006 HT77XX Product Tape and Reel Specifications TO-92 Reel Dimensions (Unit: mm) P ackage U p, 30 F la t S id e U p P ackage U p, F la t S id e D o w n 58 88 360 43 Rev 1.10 11 March 7, 2006 HT77XX SOT-89 & SOT-25 Reel Dimensions T2 D A B C T1 SOT-89 Symbol A B C D T1 T2 SOT-25 Symbol A B C D T1 T2 Description Reel Outer Diameter Reel Inner Diameter Spindle Hole Diameter Key Slit Width Space Between Flange Reel Thickness Dimensions in mm 1781.0 621.0 13.00.2 2.50.25 8.4+1.5 -0.0 11.4+1.5 Description Reel Outer Diameter Reel Inner Diameter Spindle Hole Diameter Key Slit Width Space Between Flange Reel Thickness Dimensions in mm 1801.0 621.5 12.75+0.15 1.90.15 12.4+0.2 17-0.4 Rev 1.10 12 March 7, 2006 HT77XX TO-92 Carrier Tape Dimensions P Dh H1 H H0 l1 W2 W0 t W1 W F1 P2 P0 F2 D0 TO-92 Symbol I1 P P0 P2 F1 F2 Dh W W0 W1 W2 H0 H1 D0 t H Note: Description Taped Lead Length Component Pitch Perforation Pitch Component to Perforation (Length Direction) Lead Spread Lead Spread Component Alignment Carrier Tape Width Hold-down Tape Width Perforation Position Hold-down Tape Position Lead Clinch Height Component Height Perforation Diameter Taped Lead Thickness Component Base Height Dimensions in mm (2.5) 12.71.0 12.70.3 6.350.4 2.5+0.4 -0.1 2.5+0.4 -0.1 00.1 18.0+1.0 -0.5 6.00.5 9.00.5 (0.5) 16.00.5 Less than 24.7 4.00.2 0.70.2 19.00.5 Thickness less than 0.380.05mm~0.5mm P0 Accumulated pitch tolerance: 1mm/20pitches. ( ) Bracketed figures are for reference only. Rev 1.10 13 March 7, 2006 HT77XX SOT-89 & SOT-25 Carrier Tape Dimensions D E F W C P0 P1 t B0 D1 P K0 A0 SOT-89 Symbol W P E F D D1 P0 P1 A0 B0 K0 t C SOT-25 Symbol W P E F D D1 P0 P1 A0 B0 K0 t C Description Carrier Tape Width Cavity Pitch Perforation Position Cavity to Perforation (Width Direction) Perforation Diameter Cavity Hole Diameter Perforation Pitch Cavity to Perforation (Length Direction) Cavity Length Cavity Width Cavity Depth Carrier Tape Thickness Cover Tape Width Dimensions in mm 8.00.3 4.0 1.75 3.50.05 1.5+0.1 1.5+0.1 4.0 2.0 3.15 3.2 1.4 0.200.03 5.3 Description Carrier Tape Width Cavity Pitch Perforation Position Cavity to Perforation (Width Direction) Perforation Diameter Cavity Hole Diameter Perforation Pitch Cavity to Perforation (Length Direction) Cavity Length Cavity Width Cavity Depth Carrier Tape Thickness Cover Tape Width Dimensions in mm 12.0+0.3 -0.1 8.00.1 1.750.1 5.50.05 1.5+0.1 1.5+0.1 4.00.1 2.00.10 4.80.1 4.50.1 1.80.1 0.300.013 9.3 Rev 1.10 14 March 7, 2006 HT77XX Holtek Semiconductor Inc. (Headquarters) No.3, Creation Rd. II, Science Park, Hsinchu, Taiwan Tel: 886-3-563-1999 Fax: 886-3-563-1189 http://www.holtek.com.tw Holtek Semiconductor Inc. (Taipei Sales Office) 4F-2, No. 3-2, YuanQu St., Nankang Software Park, Taipei 115, Taiwan Tel: 886-2-2655-7070 Fax: 886-2-2655-7373 Fax: 886-2-2655-7383 (International sales hotline) Holtek Semiconductor Inc. (Shanghai Sales Office) 7th Floor, Building 2, No.889, Yi Shan Rd., Shanghai, China 200233 Tel: 021-6485-5560 Fax: 021-6485-0313 http://www.holtek.com.cn Holtek Semiconductor Inc. (Shenzhen Sales Office) 43F, SEG Plaza, Shen Nan Zhong Road, Shenzhen, China 518031 Tel: 0755-8346-5589 Fax: 0755-8346-5590 ISDN: 0755-8346-5591 Holtek Semiconductor Inc. (Beijing Sales Office) Suite 1721, Jinyu Tower, A129 West Xuan Wu Men Street, Xicheng District, Beijing, China 100031 Tel: 010-6641-0030, 6641-7751, 6641-7752 Fax: 010-6641-0125 Holmate Semiconductor, Inc. (North America Sales Office) 46712 Fremont Blvd., Fremont, CA 94538 Tel: 510-252-9880 Fax: 510-252-9885 http://www.holmate.com Copyright O 2006 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. Holteks products are not authorized for use as critical components in life support devices or systems. 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. Rev 1.10 15 March 7, 2006 |
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