|Category||Power Management => DC-DC Converters => Step-down|
|Description||PFM Step-up DC/DC Converter
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.
|Company||Holtek Semiconductor Inc.|
|Datasheet||Download HT7727A datasheet
Low start-up voltage: 0.7V (Typ.) High efficiency: 85% (Typ.) High output voltage accuracy: ±2.5% Output voltage: 3.3V, 5.0V Ultra low supply current IDD: 5mA (Typ.) Low ripple and low noise Low shutdown current: 0.5mA (Typ.) SOT-89, SOT-23 and SOT-25 packageApplications
Palmtops/PDAs Portable communicators/Smartphones Cameras/Camcorders Battery-powered equipment
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 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 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.
Part No. HT7733A HT7750A Note: ²XX² 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 SOT-25 HT77XXA (for TO-92) HT77XXA# (for SOT-89) 77XXA# (for SOT-23) 77XXA# (for SOT-25) Package Marking
Pin No. SOT-23 SOT-25 Pin Name CE VOUT NC GND LX Description Chip enable pin, high active DC/DC converter output monitoring pin No connection Ground pin Switching pin
Supply to VSS+7V Power Consumption (*1).................................. 500mW Power Consumption (*2).................................. 250mW Package Thermal Resistance TO-92, qJA.......................................................180°C/W 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. *1: applied to SOT-89 and TO-92 under Ta=25°C *2: applied to SOT-25 under Ta=25°C Storage to 125°C Operating to 85°C
Symbol VIN VOUT VSTART VHOLD IIN IDD ISHDN VIH VIL ILEAK fOSC DOSC h Note: Parameter Input Voltage Output Voltage Tolerance Start-up Voltage (Fig. IOUT=10mA; Ta=25°C (Unless otherwise specified) Test Conditions ¾ VIN: 0®2V; IOUT=1mA Min. VS=VOUT+0.5V, VX=6V Measured at the LX pin VS=VOUT“0.95, VX=6V Measured at LX pin VS=VOUT“0.95, VX=6V Measured at LX pin Typ. Max. Unit V mA kHz %
Minimum Hold-on Voltage (Fig. 1) VIN: 2®0V; IOUT=1mA No-load Input Current (Fig. 1) Supply Current (Fig. 2) Shutdown Current CE High Threshold CE Low Threshold LX Leakage Current (Fig. 3) Maximum Oscillator Frequency (Fig. 3) Oscillator Duty Cycle (Fig. 3) Efficiency IOUT=0mA VS=VOUT+0.5V Measured at VOUT pin CE=GND
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.
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