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HT7750A Dataheets PDF



Part Number HT7750A
Manufacturers Holtek Semiconductor
Logo Holtek Semiconductor
Description PFM Step-up DC/DC Converter
Datasheet HT7750A DatasheetHT7750A Datasheet (PDF)

HT77XXA PFM Step-up DC/DC Converter Features · Low start-up voltage: 0.7V (Typ.) · High efficiency: 85% (Typ.) · High output voltage accuracy: ±2.5% · Output voltage: 2.7V, 3.0V, 3.3V, 5.0V · Ultra low supply current IDD: 5mA (Typ.) · Low ripple and low noise · Low shutdown current: 0.5mA (Typ.) · TO-92, SOT-89, SOT-23 and SOT-25 package Applications · Palmtops/PDAs · Portable communicators/Smartphones · Cameras/Camcorders · Battery-powered equipment General Description The HT77XXA series i.

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HT77XXA PFM Step-up DC/DC Converter Features · Low start-up voltage: 0.7V (Typ.) · High efficiency: 85% (Typ.) · High output voltage accuracy: ±2.5% · Output voltage: 2.7V, 3.0V, 3.3V, 5.0V · Ultra low supply current IDD: 5mA (Typ.) · Low ripple and low noise · Low shutdown current: 0.5mA (Typ.) · TO-92, SOT-89, SOT-23 and SOT-25 package Applications · Palmtops/PDAs · Portable communicators/Smartphones · Cameras/Camcorders · Battery-powered equipment General Description The HT77XXA 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 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 HT77XXA 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. Selection Table Part No. HT7727A HT7730A HT7733A HT7750A Output Voltage 2.7V 3.0V 3.3V 5.0V Package TO-92 SOT-89 SOT-23 SOT-25 Marking HT77XXA (for TO-92) HT77XXA# (for SOT-89) 77XXA# (for SOT-23) 77XXA# (for SOT-25) Note: 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 L X L X L im ite r O S C 2 0 0 k H z VO UT V re f B u ffe r P F M C o n tro l C h ip E n a b le CE GND Rev 1.10 1 September 26, 2007 HT77XXA Pin Assignment T O -9 2 S O T -8 9 H T77X X A 123 F r o n t V ie w H T77X X A # S O T -2 3 VO UT 3 T o p V ie w 77X X A # S O T -2 5 LX 5 GND 4 T o p V ie w 77X X A # T o p V ie w G N D V O U T LX 1 23 G N D V O U T LX 12 G N D LX 1 23 CE VO UT NC B o tto m V ie w G N D V O U T LX G N D LX CE VO UT NC Pin Description TO-92 Pin No. SOT-89 SOT-23 ¾¾¾ 223 ¾¾¾ 111 332 SOT-25 1 2 3 4 5 Pin Name Description CE VOUT NC GND LX 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 Operating Temperature ...........................-40°C to 85°C Storage Temperature ............................-50°C to 125°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 Thermal Resistance qJA (Junction to Ambient) (Assume no ambient airflow, no heat sink) PD Power Dissipation Note: PD is measured at Ta= 25°C Package SOT-89 TO-92 SOT-23 SOT-25 SOT-89 TO-92 SOT-23 SOT-25 Max. 300 300 330 320 0.33 0.33 0.3 0.31 Unit °C/W °C/W °C/W °C/W W W W W Rev 1.10 2 September 26, 2007 HT77XXA Electrical Characteristics VIN=VOUT´0.6; IOUT=10mA; Ta=25°C (Unless otherwise specified) Symbol Parameter Test Conditions Min. Typ. Max. Unit VIN VOUT Input Voltage Output Voltage Tolerance ¾ ¾¾ 6 V ¾ -2.5 ¾ 2.5 % VSTART VHOLD IIN IDD ISHDN Start-up Voltage (Fig. 1) VIN: 0®2V; IOUT=1mA Minimum Hold-on Voltage (Fig. 1) VIN: 2®0V; IOUT=1mA No-load Input Current (Fig. 1) IOUT=0mA Supply Current (Fig. 2) VS=VOUT+0.5V Measured at VOUT pin Shutdown Current CE=GND ¾ 0.7 0.9 V ¾ ¾ 0.7 V ¾ 13 26 mA ¾ 5 10 mA ¾ 0.5 1 mA VIH CE High Threshold ¾ 2 ¾¾ 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 VS=VOUT´0.95, VX=6V (Fig. 3) Measured at LX pin ¾ 200 ¾ kHz DOSC Oscillator Duty Cycle (Fig. 3) VS=VOUT´0.95, VX=6V Measured at LX pin 65 75 85 % h Efficiency ¾ 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 100mH V IN 1N 5817 V OUT 47mF LX ( T a n ta lu m ) VO UT H T77X X A S e r ie s GND (F ig . 1 ) 22mF V S ( T a n ta lu m ) VO UT LX H T77X X A S e r ie s GND VS VO UT LX H T77X X A S e r ie s GND 100W VX (F ig . 2 ) (F ig . 3 ) Rev 1.10 3 September 26, 2007 HT77XXA Typical Performance Characteristics O u tp u t V o lta g e ( V ) 2 .8.


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