Order this document by LP2950/D
LP2950
LP2951
Micropower Voltage Regulators
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.
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.
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%.
LP2950 and LP2951 Features:
MICROPOWER
LOW DROPOUT
VOLTAGE REGULATORS
Z SUFFIX
PLASTIC PACKAGE
CASE 29
(TO–226AA/TO–92)
1
2
3
Pin: 1. Output
2. Ground
3. Input
DT SUFFIX
PLASTIC PACKAGE
CASE 369A
(DPAK)
1
3
1
2
3
Pin: 1. Input
2. Ground
3. Output
•
•
•
•
•
•
•
•
•
Low Quiescent Bias Current of 75
µA
Low Input–to–Output Voltage Differential of 50 mV at 100
µA
and
380 mV at 100 mA
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
(Top View)
Heatsink surface (shown as terminal 4 in
case outline drawing) is connected to Pin 2.
D SUFFIX
PLASTIC PACKAGE
CASE 751
(SO–8)
8
1
LP2951 Additional Features:
Error Output Signals an Out of Regulation Condition
Output Programmable from 1.25 V to 29 V
Logic Level Shutdown Input
N SUFFIX
PLASTIC PACKAGE
CASE 626
8
1
DM SUFFIX
PLASTIC PACKAGE
CASE 846A
(Micro–8)
8
1
Output 1
Sense 2
Shutdown 3
Gnd 4
(See Following Page for Ordering Information.)
©
Motorola, Inc. 1996
8
7
6
5
(Top View)
Input
Feedback
VO Tap
Error Output
Rev 4
MOTOROLA ANALOG IC DEVICE DATA
1
MOTOROLA [ MOTOROLA, INC ]
