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LP4950C-5V Datasheet

  • LP4950C-5V

  • Adjustable Micropower Voltage Regulators

  • 14頁

  • NSC

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LP4950C-5V and LP4951C Adjustable Micropower Voltage Regulators
September 2002
LP4950C-5V and LP4951C
Adjustable Micropower Voltage Regulators
General Description
The LP4950C and LP4951C are micropower voltage regu-
lators with very low quiescent current (75碌A(chǔ) typ.) and very
low dropout voltage (typ. 40mV at light loads and 380mV at
100mA). They are ideally suited for use in battery-powered
systems. Furthermore, the quiescent current of the
LP4950C/LP4951C increases only slightly in dropout, pro-
longing battery life.
The LP4950C in the popular 3-pin TO-92 package is pin
compatible with older 5V regulators. The 8-lead LP4951C is
available in a plastic surface mount package and offers
additional system functions.
One such feature is an error flag output which warns of a low
output voltage, often due to falling batteries on the input. It
may be used for a power-on reset. A second feature is the
logic-compatible shutdown input which enables the regulator
to be switched on and off. Also, the part may be pin-strapped
for a 5V output or programmed from 1.24V to 29V with an
external pair of resistors.
Careful design of the LP4950C/LP4951C has minimized all
contributions to the error budget. This includes a tight initial
tolerance (.5% typ.), extremely good load and line regulation
(.05% typ.) and a very low output voltage temperature coef-
ficient, making the part useful as a low-power voltage refer-
ence.
Features
n
n
n
n
n
n
n
n
High accuracy 5V guaranteed 100mA output
Extremely low quiescent current
Low dropout voltage
Extremely tight load and line regulation
Very low temperature coefficient
Use as Regulator or Reference
Needs only 1碌F for stability
Current and Thermal Limiting
LP4951C versions only
n
Error flag warns of output dropout
n
Logic-controlled electronic shutdown
n
Output programmable from 1.24 to 29V
Block Diagram and Typical
Applications
LP4950C
LP4951C
20052825
20052801
漏 2002 National Semiconductor Corporation
DS200528
www.national.com

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