HT7936A_16 Datasheet, PDF (1/15 Pages) Holtek Semiconductor Inc – White LED Step-up Charge Pump Converter

HT7936A/HT7936B
White LED Step-up Charge Pump Converter
Features
· Input voltage range: 2.8V to V_OUT
· Driving current: 110mA (HT7936A),
150mA (HT7936B)
· Fixed output voltage: 5V (HT7936A),
4.5V (HT7936B)
· Oscillator frequency: 1MHz
· Soft start function, current limit,
short circuit protection
· Small outline SOT23-6 package
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 ca-
pacitor 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, V_OUT.
To meet the demands of today¢s power sensitive appli-
cations, 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 fea-
tures, supplied in 6-pin SOT-23-6 package type, will en-
sure 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%
Package
SOT23-6
SOT23-6
Marking
936A
936B
Rev 1.30
1
June 25, 2016