White LED Step-up Charge Pump Converter
HT7936A/HT7936B White LED Step-up Charge Pump Converter
Features
· Input voltage range: 2.8V to VOUT · Driving current: ...
Description
HT7936A/HT7936B White LED Step-up Charge Pump Converter
Features
· Input voltage range: 2.8V to VOUT · Driving current: 110mA (HT7936A), · Oscillator frequency: 1MHz · Soft start function, current limit,
150mA (HT7936B)
· Fixed output voltage: 5V (HT7936A),
short circuit protection
· Small outline SOT23-6 package
4.5V (HT7936B)
Applications
· Cellular phones · PDAs · DSCs · Handheld devices · White LED display backlighting
General Description
The HT7936A and HT7936B are charge-pump type DC-DC step-up converter devices, which can generate regulated fixed output voltages of 5.0V and 4.5V. Their high degree of functional integration requires only the addition of three external capacitors, namely a flying capacitor and an input and output capacitor, to implement a full step-up conversion function. The devices have the additional benefit of an integrated soft start function to reduce the level of in-rush current during device power on. The operating voltage range is from 2.8V to the full output voltage value, VOUT. To meet the demands of today¢s power sensitive applications, the devices, have a very low standby current value as well as the extra safety features of current limit and short circuit protection. This range of device features, supplied in 6-pin SOT-23-6 package type, will ensure that these device will find excellent use in a wide range of DC-DC step-up converter applications.
Selection Table
Part No. HT7936A HT7936B Output Voltage 5.0V 4.5V Tolerance ±4% ±4% Packa...
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