The LP2950 and LP2951 are micropower voltage regulators that are
specifically designed to maintain proper regulation with an extremely
low input–to–output voltage differential. These devices feature a very
low quiescent bias current of 75 µA and are capable of supplying
output currents in excess of 100 mA. Internal current and thermal
limiting protection is provided.
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The LP2951 has three additional features. The first is the Error
Output that can be used to signal external circuitry of an out of
regulation condition, or as a microprocessor power–on reset. The
second feature allows the output voltage to be preset to 5.0 V, 3.3 V or
3.0 V output (depending on the version) or programmed from 1.25 V
to 29 V. It consists of a pinned out resistor divider along with direct
access to the Error Amplifier feedback input. The third feature is a
Shutdown input that allows a logic level signal to turn–off or turn–on
the regulator output.
TO–92
Z SUFFIX
CASE 29
Pin: 1. Output
2. Ground
3. Input
1
2
3
DPAK
DT SUFFIX
CASE 369A
1
3
Due to the low input–to–output voltage differential and bias current
specifications, these devices are ideally suited for battery powered
computer, consumer, and industrial equipment where an extension of
useful battery life is desirable. The LP2950 is available in the three
pin case 29 and DPAK packages, and the LP2951 is available in the
eight pin dual–in–line, SO–8 and Micro–8 surface mount packages.
The ‘A’ suffix devices feature an initial output voltage tolerance
±0.5%.
PIN CONNECTIONS
Pin: 1. Input
2. Ground
3. Output
1
2
3
(Top View)
Heatsink surface (shown as terminal 4 in
case outline drawing) is connected to Pin 2.
LP2950 and LP2951 Features:
• Low Quiescent Bias Current of 75 µA
SO–8
D SUFFIX
CASE 751
• Low Input–to–Output Voltage Differential of 50 mV at 100 µA and
380 mV at 100 mA
8
1
• 5.0 V, 3.3 V or 3.0 V ±0.5% Allows Use as a Regulator or Reference
• Extremely Tight Line and Load Regulation
• Requires Only a 1.0 µF Output Capacitor for Stability
• Internal Current and Thermal Limiting
LP2951 Additional Features:
N SUFFIX
CASE 626
8
1
• Error Output Signals an Out of Regulation Condition
• Output Programmable from 1.25 V to 29 V
Micro–8
DM SUFFIX
CASE 846A
8
• Logic Level Shutdown Input
1
(See Following Page for Device Information.)
PIN CONNECTIONS
1
2
3
4
8
7
6
5
Output
Sense
Input
Feedback
Shutdown
Gnd
V Tap
O
Error Output
(Top View)
ORDERING INFORMATION
Seedetailedorderingandshippinginformationinthepackage
dimensions section on page 13 of this data sheet.
Semiconductor Components Industries, LLC, 1999
1
Publication Order Number:
October, 1999 – Rev. 5
LP2950/D
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