HT77XX PFM Step-up DC/DC Converter Features · Low start-up voltage: 0.7V (Typ.), 0.9V (Max.) · High efficiency: 85% (Typ.), VOUT³2.7V · Ultra low supply current IDD2: 4mA (Typ.) · Low ripple and low noise · High output voltage accuracy: ±2.5% · Low shutdown current: 0.5mA (Typ.) · Output voltage: 1.8V, 2.7V, 3.0V, 3.3V, 3.7V, 5.0V · TO-92, SOT-89, SOT-23 and SOT-25 package Applications · Palmtops/PDAs · Cameras/Camcorders · Portable communicators/Smartphones · Battery-powered equipment General Description 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, SOT-23 and SOT-25 packages. For SOT-25 package, it also build-in a chip enable function to reduce power consumption during shutdown mode. 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 1.8V, 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. Selection Table Part No. Note: Output Voltage HT7718 1.8V HT7727 2.7V HT7730 3.0V HT7733 3.3V HT7737 3.7V HT7750 5.0V Package Marking TO-92 SOT-89 SOT-23 SOT-25 HT77XX (for TO-92) HT77XX# (for SOT-89) 77XX# (for SOT-23) 77XX# (for SOT-25) ²XX² stands for output voltages. Only lead free devices are available. ²#² stands for lead free devices. For the TO-92 package, there will be a ²#² mark at the end of the date code. Block Diagram V re f V O U T L X B u ffe r P F M C o n tro l O S C 1 1 5 k H z G N D C h ip E n a b le C E Rev 1.60 1 September 12, 2007 HT77XX Pin Assignment S O T -8 9 T O -9 2 H T 7 7 X X 1 2 S O T -2 5 S O T -2 3 L X 5 V O U T 3 F r o n t V ie w G N D 4 3 H T 7 7 X X # G N D V O U T L X B o tto m 1 2 3 G N D V O U T L X G N D V O U T L X T o p V ie w 7 7 X X # T o p V ie w 7 7 X X # 1 2 1 2 3 G N D L X C E V O U T N C G N D L X C E V O U T N C V ie w Pin Description Pin No. Pin Name TO-92 SOT-89 SOT-23 SOT-25 ¾ ¾ ¾ 1 CE 2 2 3 2 VOUT ¾ ¾ ¾ 3 NC 1 1 1 4 GND 3 3 2 5 LX Description Chip enable pin, high active DC/DC converter output monitoring pin No connection Ground pin Switching pin Absolute Maximum Ratings Supply Voltage ..............................VSS-0.3V to VSS+7V Storage Temperature ............................-50°C to 125°C Operating Temperature ...........................-40°C to 85°C Note: These are stress ratings only. Stresses exceeding the range specified under ²Absolute Maximum Ratings² 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. Thermal Information Symbol Parameter qJA Thermal Resistance (Junction to Ambient) (Assume no ambient airflow, no heat sink) PD Package Max. Unit SOT-89 300 °C/W TO-92 300 °C/W SOT-23 330 °C/W SOT-25 320 °C/W SOT-89 0.33 W TO-92 0.33 W SOT-23 0.3 W SOT-25 0.31 W Power Dissipation Note: PD is measured at Ta= 25°C Rev 1.60 2 September 12, 2007 HT77XX Electrical Characteristics Symbol VIN=VOUT´0.6; IOUT=10mA; Ta=25°C (Unless otherwise specified) Parameter Test Conditions Min. Typ. Max. Unit VIN Input Voltage ¾ ¾ ¾ 6 V DVOUT Output Voltage Tolerance ¾ -2.5 ¾ 2.5 % VSTART Start-up Voltage (Fig. 1) VIN: 0®2V; IOUT=1mA ¾ 0.7 0.9 V VHOLD Minimum Hold-on Voltage (Fig. 1) VIN: 2®0V; IOUT=1mA ¾ ¾ 0.7 V IIN No-load Input Current (Fig. 1) ¾ 10 20 mA VOUT=1.8V ¾ 35 50 VOUT=2.7V ¾ 40 60 VOUT=3.0V ¾ 45 68 VOUT=3.3V ¾ 55 81 VOUT=3.7V ¾ 64 85 VOUT=5.0V ¾ 85 134 IDD1 Supply Current 1 (Fig. 2) IOUT=0mA VS=VOUT´0.95 Measured at VOUT pin mA IDD2 Supply Current 2 (Fig. 2) VS=VOUT+0.5V Measured at VOUT pin ¾ 4 7 mA ISHDN Shutdown Current CE=GND ¾ 0.5 1 mA VIH CE High Threshold ¾ 2 ¾ ¾ V VIL CE Low Threshold ¾ ¾ ¾ 0.4 V ILEAK LX Leakage Current (Fig. 3) VS=VOUT+0.5V, VX=6V Measured at the LX pin ¾ ¾ 0.9 mA fOSC Maximum Oscillator Frequency (Fig. 3) VS=VOUT´0.95 Measured at LX pin ¾ 115 ¾ kHz DOSC Oscillator Duty Cycle (Fig. 3) VS=VOUT´0.95 Measured at LX pin 65 75 85 % h VOUT£1.8V ¾ 80 Efficiency ¾ VOUT³2.7V ¾ 85 ¾ Note: % Absolute maximum ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is intended to be functional, but do not guarantee specific performance limits. The guaranteed specifications apply only for the test conditions listed. Test Circuit 1 N 5 8 1 7 1 0 0 m H V V IN 4 7 m F ( T a n ta lu m ) Rev 1.60 L X H T 7 7 X X S e r ie s V O U T O U T 1 0 0 m F ( T a n ta lu m ) V S V O U T H T 7 7 X X S e r ie s L X V S V O U T H T 7 7 X X S e r ie s G N D G N D G N D (F ig . 1 ) (F ig . 2 ) (F ig . 3 ) 3 L X V 1 0 0 W X September 12, 2007 HT77XX 1 .9 0 2 .8 0 1 .8 5 2 .7 5 V 1 .8 0 V IN = 1 .0 V V IN = 1 .6 V = 1 .2 V IN O u tp u t V o lta g e ( V ) O u tp u t V o lta g e ( V ) Typical Performance Characteristics V 1 .7 5 = 1 .4 V IN 1 .7 0 V 2 .7 0 V 2 .6 5 IN V = 1 .2 V 0 2 0 4 0 6 0 8 0 1 0 0 1 2 0 0 1 4 0 2 0 4 0 6 0 8 0 1 0 0 HT7718 Output Voltage v.s Output Current 9 0 8 5 % 8 5 V 7 5 % V V 7 0 % IN IN IN = 1 .2 V = 1 .0 V V IN = 1 .4 V V 6 0 % 6 0 2 0 4 0 6 0 8 0 1 0 0 1 2 0 5 5 1 4 0 V IN IN = 1 .8 V = 1 .6 V 7 0 6 5 0 = 2 .0 V V 7 5 6 5 % 5 5 % IN 8 0 = 1 .6 V E ffic ie n c y ( % ) V 1 4 0 HT7727 Output Voltage v.s Output Current 9 0 % 8 0 % 1 2 0 O u tp u t C u rre n t (m A ) O u tp u t C u rre n t (m A ) E ffic ie n c y ( % ) V IN = 1 . 8 V = 1 .6 V IN 2 .6 0 2 .5 0 1 .6 0 0 2 0 4 0 IN = 1 .2 V 6 0 8 0 1 0 0 1 2 0 1 4 0 O u tp u t C u rre n t (m A ) O u tp u t C u rre n t (m A ) HT7727 Efficiency v.s Output Current HT7718 Efficiency v.s Output Current 1 .0 1 .0 0 .9 0 .9 S ta rt-u p 0 .8 In p u t V o lta g e ( V ) H o ld - o n 0 .6 0 .5 0 .4 0 .7 0 .6 0 .5 0 .3 0 .2 0 .2 0 .1 0 .1 0 .0 2 4 6 8 1 0 1 2 1 4 1 6 1 8 2 0 0 2 4 6 8 1 0 1 2 1 4 1 6 1 8 O u tp u t C u rre n t (m A ) O u tp u t C u rre n t (m A ) HT7727 Start-Up& Hold-On Voltage HT7718 Start-Up& Hold-On Voltage Rev 1.60 H o ld o n 0 .4 0 .3 0 S ta rt u p 0 .8 0 .7 In p u t V o lta g e ( V ) = 2 .0 V 2 .5 5 1 .6 5 0 .0 IN 4 September 12, 2007 HT77XX 3 .4 3 .0 2 3 .0 0 V 2 .9 8 V 2 .9 4 IN V = 1 .2 V IN IN = 1 .8 V V 3 .2 = 1 .5 V O u tp u t V o lta g e ( V ) O u tp u t V o lta g e ( V ) 2 .9 6 3 .3 = 2 .0 V IN V 2 .9 2 2 .9 0 2 .8 8 2 .8 6 V V IN V IN = 1 .8 V = 1 .5 V 3 .1 3 .0 2 .9 2 .8 2 .6 2 .8 2 2 .8 0 0 2 0 4 0 6 0 8 0 1 0 0 1 2 0 2 .5 1 4 0 0 O u tp u t C u rre n t (m A ) HT7730 Output Voltage v.s Output Current 2 0 4 0 6 0 8 0 1 0 0 O u tp u t C u rre n t (m A ) 1 2 0 1 4 0 HT7733 Output Voltage v.s Output Current 9 0 8 5 V 8 0 V 7 5 V IN = 2 .0 V IN = 1 .8 V IN = 1 .5 V 8 5 7 0 6 5 V IN V 8 0 E ffic ie n c y ( % ) E ffic ie n c y ( % ) = 2 .0 V IN = 1 .2 V 2 .7 2 .8 4 = 1 .2 V 6 0 V 7 5 V 7 0 V = 1 .2 V IN IN IN IN = 2 .0 V = 1 .8 V = 1 .5 V 6 5 6 0 5 5 5 0 IN 5 5 0 2 0 4 0 6 0 8 0 1 0 0 O u tp u t C u rre n t (m A ) 1 2 0 5 0 1 4 0 0 2 0 4 0 6 0 8 0 1 0 0 1 2 0 1 4 0 O u tp u t C u rre n t (m A ) HT7730 Efficiency v.s Output Current HT7733 Efficiency v.s Output Current 1 .1 1 .0 1 .0 S ta rt u p 0 .8 0 .8 0 .7 0 .7 0 .6 0 .5 H o ld o n 0 .4 0 .6 0 .5 0 .4 0 .3 0 .3 0 .2 0 .2 0 .1 0 .0 S ta rt u p 0 .9 In p u t V o lta g e ( V ) In p u t V o lta g e ( V ) 0 .9 H o ld o n 0 .1 0 2 4 6 8 1 0 1 2 1 4 1 6 1 8 0 .0 2 0 O u tp u t C u rre n t (m A ) 2 4 6 8 1 0 1 2 1 4 1 6 1 8 2 0 O u tp u t C u rre n t (m A ) HT7730 Start-Up& Hold-On Voltage Rev 1.60 0 HT7733 Start-Up& Hold-On Voltage 5 September 12, 2007 HT77XX 4 .0 5 .5 3 .9 V 3 .7 O u tp u t V o lta g e ( V ) 3 .6 V 3 .5 IN IN V = 1 .5 V IN = 2 .2 V V 3 .2 IN = 1 .2 V 3 .1 3 .0 2 .9 2 .7 V V 4 .0 2 .5 = 2 .0 V 3 .5 V 3 .0 0 2 0 4 0 6 0 8 0 1 0 0 1 2 0 1 .5 1 4 0 0 2 0 4 0 IN = 1 .2 V 9 0 V 8 0 V IN = 3 .0 V IN = 2 .2 V 8 0 1 0 0 1 2 0 1 4 0 HT7750 Output Voltage v.s Output Current HT7737 Output Voltage v.s Output Current 8 5 6 0 O u tp u t C u rre n t (m A ) O u tp u t C u rre n t (m A ) 1 0 0 9 0 V IN = 3 .0 V IN = 2 .0 V V IN 8 0 7 0 V IN E ffic ie n c y ( % ) 7 5 E ffic ie n c y ( % ) IN = 1 .5 V IN 2 .0 2 .6 = 1 .5 V 6 5 V 6 0 = 1 .2 V IN 5 5 V 7 0 6 0 V IN = 1 .5 V = 1 .2 V 5 0 4 0 5 0 3 0 4 5 4 0 0 2 0 4 0 6 0 8 0 1 0 0 1 2 0 2 0 1 4 0 0 2 0 4 0 6 0 8 0 1 0 0 1 2 0 1 4 0 O u tp u t C u rre n t (m A ) O u tp u t C u rre n t (m A ) HT7750 Efficiency v.s Output Current HT7737 Efficiency v.s Output Current 1 .8 1 .1 1 .0 1 .6 S ta rt u p 0 .9 1 .4 In p u t V o lta g e ( V ) 0 .8 In p u t V o lta g e ( V ) = 3 .0 V 2 .5 2 .8 0 .7 0 .6 0 .5 H o ld o n 0 .4 0 .3 1 .2 S ta rt u p 1 .0 0 .8 0 .6 0 .4 0 .2 H o ld o n 0 .2 0 .1 0 .0 IN 4 .5 3 .4 3 .3 V 5 .0 = 3 .0 V O u tp u t V o lta g e ( V ) 3 .8 0 2 4 6 8 1 0 1 2 1 4 1 6 1 8 0 .0 2 0 HT7737 Start-Up& Hold-On Voltage Rev 1.60 0 2 4 6 8 1 0 1 2 1 4 1 6 1 8 2 0 O u tp u t C u rre n t (m A ) O u tp u t C u rre n t (m A ) HT7750 Start-Up& Hold-On Voltage 6 September 12, 2007 HT77XX HT7733 Load Transient Response (L=100mH, COUT=100mF, VIN=1.98V) HT7718 Load Transient Response (L=100mH, COUT=100mF, VIN=1.08V) HT7727 Load Transient Response (L=100mH, COUT=100mF, VIN=1.62V) HT7737 Load Transient Response (L=100mH, COUT=100mF, VIN=2.22V) V O U T 5 0 m V /d iv 5 0 m A L o a d S te p 2 0 m A /d iv HT7730 Load Transient Response (L=100mH, COUT=100mF, VIN=1.8V) Rev 1.60 HT7750 Load Transient Response (L=100mH, COUT=100mF, VIN=3V) 7 September 12, 2007 HT77XX V V 2 0 m V /d iv O U T V V IN IN 1 V /d iv 1 V /d iv HT7733 Line Transient Response (L=100mH, COUT=100mF) Rev 1.60 2 0 m V /d iv O U T HT7750 Line Transient Response (L=100mH, COUT=100mF) 8 September 12, 2007 HT77XX Application Circuits Without CE Pin 1 N 5 8 1 7 1 0 0 m H V V IN 4 7 m F ( T a n ta lu m ) L X H T 7 7 X X S e r ie s V O U T O U T 1 0 0 m F ( T a n ta lu m ) G N D With CE Pin 1 N 5 8 1 7 1 0 0 m H V V IN 4 7 m F ( T a n ta lu m ) L X H T 7 7 X X S e r ie s C E 1 0 0 m H V 1 0 0 m F ( T a n ta lu m ) G N D 1 N 5 8 1 7 V IN 4 7 m F ( T a n ta lu m ) L X H T 7 7 X X S e r ie s C E Note: V O U T O U T V O U T O U T 1 0 0 m F ( T a n ta lu m ) G N D 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 converter¢s 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 1.60 9 September 12, 2007 HT77XX Package Information 3-pin TO-92 Outline Dimensions A B D C E F G H Symbol A Rev 1.60 Dimensions in mil Min. Nom. Max. 170 ¾ 200 200 B 170 ¾ C 500 ¾ ¾ D 11 ¾ 20 E 90 ¾ 110 F 45 ¾ 55 G 45 ¾ 65 H 130 ¾ 160 I 8 ¾ 18 a 4° ¾ 6° 10 September 12, 2007 HT77XX 3-pin SOT-89 Outline Dimensions I A J B C E D G F Symbol Rev 1.60 H Dimensions in mil Min. Nom. Max. A 173 ¾ 181 B 64 ¾ 72 C 90 ¾ 102 D 35 ¾ 47 E 155 ¾ 167 F 14 ¾ 19 G 17 ¾ 22 H ¾ 59 ¾ I 55 ¾ 63 J 14 ¾ 17 11 September 12, 2007 HT77XX 3-pin SOT-23 Outline Dimensions D C L H E q e A A 2 b Symbol Rev 1.60 A 1 Dimensions in mm Min. Nom. Max. A 1 ¾ 1.3 A1 ¾ ¾ 0.1 A2 0.7 ¾ 0.9 b 0.35 ¾ 0.5 C 0.1 ¾ 0.25 D 2.7 ¾ 3.1 E 1.4 ¾ 1.8 e ¾ 1.9 ¾ H 2.6 ¾ 3 L 0.37 ¾ ¾ q 1° ¾ 9° 12 September 12, 2007 HT77XX 5-pin SOT-25 Outline Dimensions D C L H E q e A A 2 b Symbol Dimensions in mm Min. Nom. Max. 1.00 ¾ 1.30 A1 ¾ ¾ 0.10 A2 0.70 ¾ 0.90 A Rev 1.60 A 1 b 0.35 ¾ 0.50 C 0.10 ¾ 0.25 D 2.70 ¾ 3.10 E 1.40 ¾ 1.80 e ¾ 1.90 ¾ H 2.60 ¾ 3 L 0.37 ¾ ¾ q 1° ¾ 9° 13 September 12, 2007 HT77XX Product Tape and Reel Specifications TO-92 Reel Dimensions (Unit: mm) P a c k a g e U p , F la t S id e U p 3 0 P a c k a g e U p , F la t S id e D o w n 4 3 5 8 8 8 3 6 0 Rev 1.60 14 September 12, 2007 HT77XX SOT-89, SOT-23 & SOT-25 Reel Dimensions D T 2 A C B T 1 SOT-89 Symbol Description A Reel Outer Diameter Dimensions in mm 180±1.0 B Reel Inner Diameter C Spindle Hole Diameter D Key Slit Width 1.9±0.15 T1 Space Between Flange 12.4+0.2 T2 Reel Thickness 62±1.5 12.75+0.15 17-0.4 SOT-23 Symbol Description Dimensions in mm A Reel Outer Diameter 178±1 B Reel Inner Diameter 62±1 C Spindle Hole Diameter D Key Slit Width T1 Space Between Flange 8.4+1.5 T2 Reel Thickness 11.4+1.5 13±0.2 2.5±0.25 SOT-25 Symbol Description A Reel Outer Diameter Dimensions in mm 178±1.0 B Reel Inner Diameter C Spindle Hole Diameter 13.0±0.2 D Key Slit Width 2.5±0.25 T1 Space Between Flange 8.4+1.5 -0.0 T2 Reel Thickness 11.4+1.5 Rev 1.60 62±1.0 15 September 12, 2007 HT77XX TO-92 Carrier Tape Dimensions P D h W 2 H 1 H H 0 l1 W 0 t W 1 W F 1 F 2 D 0 P 2 P 0 TO-92 Symbol Note: Description Dimensions in mm I1 Taped Lead Length (2.5) P Component Pitch 12.7±1.0 P0 Perforation Pitch 12.7±0.3 P2 Component to Perforation (Length Direction) 6.35±0.4 F1 Lead Spread 2.5+0.4 -0.1 F2 Lead Spread 2.5+0.4 -0.1 Dh Component Alignment W Carrier Tape Width 18.0+1.0 -0.5 W0 Hold-down Tape Width 6.0±0.5 W1 Perforation Position 9.0±0.5 W2 Hold-down Tape Position H0 Lead Clinch Height 16.0±0.5 H1 Component Height Less than 24.7 D0 Perforation Diameter 4.0±0.2 t Taped Lead Thickness 0.7±0.2 H Component Base Height 19.0±0.5 0±0.1 (0.5) Thickness less than 0.38±0.05mm~0.5mm P0 Accumulated pitch tolerance: ±1mm/20pitches. ( ) Bracketed figures are for reference only. Rev 1.60 16 September 12, 2007 HT77XX SOT-89, SOT-23 & SOT-25 Carrier Tape Dimensions P 0 D P 1 t E F W C D 1 B 0 P K 0 A 0 SOT-89 Symbol Description Dimensions in mm W Carrier Tape Width 12.0+0.3 -0.1 P Cavity Pitch 8.0±0.1 E Perforation Position 1.75±0.1 F Cavity to Perforation (Width Direction) 5.5±0.05 D Perforation Diameter 1.5+0.1 D1 Cavity Hole Diameter 1.5+0.1 P0 Perforation Pitch 4.0±0.1 P1 Cavity to Perforation (Length Direction) 2.0±0.10 A0 Cavity Length 4.8±0.1 B0 Cavity Width 4.5±0.1 K0 Cavity Depth 1.8±0.1 t Carrier Tape Thickness C Cover Tape Width 0.30±0.013 9.3 SOT-23 Symbol Description Dimensions in mm W Carrier Tape Width P Cavity Pitch E Perforation Position F Cavity to Perforation (Width Direction) 3.5±0.05 8±0.3 4 1.75 D Perforation Diameter 1.5+0.1 D1 Cavity Hole Diameter 1.5+0.1 P0 Perforation Pitch 4 P1 Cavity to Perforation (Length Direction) 2 A0 Cavity Length B0 Cavity Width 3.2 K0 Cavity Depth 1.4 t Carrier Tape Thickness C Cover Tape Width Rev 1.60 3.15 0.2±0.03 5.3 17 September 12, 2007 HT77XX SOT-25 Symbol Description Dimensions in mm W Carrier Tape Width P Cavity Pitch 4.0 E Perforation Position 1.75 F Cavity to Perforation (Width Direction) 3.5±0.05 D Perforation Diameter 1.5+0.1 D1 Cavity Hole Diameter 1.5+0.1 P0 Perforation Pitch P1 Cavity to Perforation (Length Direction) 2.0 A0 Cavity Length 3.15 B0 Cavity Width 3.2 K0 Cavity Depth t Carrier Tape Thickness C Cover Tape Width Rev 1.60 8.0±0.3 4.0 1.4 0.20±0.03 5.3 18 September 12, 2007 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: 86-21-6485-5560 Fax: 86-21-6485-0313 http://www.holtek.com.cn Holtek Semiconductor Inc. (Shenzhen Sales Office) 5/F, Unit A, Productivity Building, Cross of Science M 3rd Road and Gaoxin M 2nd Road, Science Park, Nanshan District, Shenzhen, China 518057 Tel: 86-755-8616-9908, 86-755-8616-9308 Fax: 86-755-8616-9722 Holtek Semiconductor Inc. (Beijing Sales Office) Suite 1721, Jinyu Tower, A129 West Xuan Wu Men Street, Xicheng District, Beijing, China 100031 Tel: 86-10-6641-0030, 86-10-6641-7751, 86-10-6641-7752 Fax: 86-10-6641-0125 Holtek Semiconductor Inc. (Chengdu Sales Office) 709, Building 3, Champagne Plaza, No.97 Dongda Street, Chengdu, Sichuan, China 610016 Tel: 86-28-6653-6590 Fax: 86-28-6653-6591 Holtek Semiconductor (USA), Inc. (North America Sales Office) 46729 Fremont Blvd., Fremont, CA 94538 Tel: 1-510-252-9880 Fax: 1-510-252-9885 http://www.holtek.com Copyright Ó 2007 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¢s 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 1.60 19 September 12, 2007