Preliminary
Functional Pin Description
Pin Name
EN
NC
GND
VOUT
VIN
Pin Function
Datasheet
LP3981
Chip Enable (Active High). Note that this pin is high impedance. There should be a pull low
100kΩ resistor connected to GND when the control signal is floating.
NC
Ground
Output Voltage
Power Input Voltage
Function Block Diagram
Absolute Maximum Ratings
Supply Input Voltage-------------------------------------------------------------------------------------------------------------6V
Power Dissipation, PD @ TA = 25°C
SOT-25 --------------------------------------------------------------------------------------------------------400mW
Package Thermal Resistance
SOT-25
, θJA ---------------------------------------------------------------------------------------------------------------250°C/W
Lead Temperature (Soldering, 10 sec.) --------------------------------------------------------------------------------260°C
Storage Temperature Range -------------------------------------------------------------------------------- −65°C to 150°C
ESD Susceptibility
HBM (Human Body Mode) ---------------------------------------------------------------------------------------------------2kV
MM(Machine-Mode)-----------------------------------------------------------------------------------------------------------200V
Recommended Operating Conditions
Supply Input Voltage------------------------------------------------------------------------------------------------2.5V to 5.5V
EN Input Voltage ------------------------------------------------------------------------------------------------------0V to 5.5V
Operation Junction Temperature Range -----------------------------------------------------------------−40°C to 125°C
Operation Ambient TemperatureRange--------------------------------------------------------------------−40°C to 85°C
LP3981 – 01 Ver. 1.1 Datasheet
Feb.-2008
Page 2 of 8
POWER [ LOWPOWER SEMICONDUCTOR INC ]
