Microsemi

Integrated Products Division

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570

Page 7

Copyright

Rev. 1.0c, 2002-08-01

LX1882

Charge Pump Doubler with Linear Regulator

I N T E GR A T ED

PRO DUC T S

APPLICATION IN FORMATION (CONTINUED )

The LX1882 contains power-on reset circuitry that insures all

internal functions are correctly initialized upon power-up. Once

the input voltage reaches approximately 1V, the power-on reset

shutdown mode, reducing the supply current to < 5uA and

continuously enable the part.

Current Limit Protection

The LX1882 includes over current protection. When the output

load current exceeds typically 60mA, the circuit forces the

regulator output to decrease.

Temperature Protection

The thermal protection shuts the LX1882 down when the

maximum rated conditions for extended periods may affect

device reliability (see Thermal Considerations below).

Thermal shutdown protects the circuit from thermal overload

caused from a rise in junction temperature during power

dissipation. This means of protection is intended for fault

protection only and not as a means from current or power

limiting during normal application usage. Proper thermal

evaluation should be done to ensure that the junction temperature

does not exceed its maximum rating (125°C). Due to variation in

individual

device

electrical

characteristics

and

thermal

resistance, the built in thermal overload protection may be

activated at power levels slightly above or below the rated

dissipation.