Motorola LP2950 LP2951 Data Sheet

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MICROPOWER The LP2950 and LP2951 are micropower voltage regulators that are LOW DROPOUT

specifically designed to maintain proper regulation with an extremely low VOLTAGE REGULATORS 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 m A. Internal current and thermal limiting protection is provided.

The LP2951 has three additional features. The first is the Error Output Z SUFFIX PLASTIC PACKAGE

that can be used to signal external circuitry of an out of regulation condition,

CASE 29

or as a microprocessor power–on reset. The second feature allows the

(TO–226AA/TO–92)

output voltage to be preset to 5.0 V, 3.3 V or 3.0 V output (depending on the

Pin: 1. Output

version) or programmed from 1.25 V to 29 V. It consists of a pinned out

2. Ground

resistor divider along with direct access to the Error Amplifier feedback input. 3. Input The third feature is a Shutdown input that allows a logic level signal to turn–off or turn–on the regulator output.

DT SUFFIX

Due to the low input–to–output voltage differential and bias current PLASTIC PACKAGE

specifications, these devices are ideally suited for battery powered CASE 369A (DPAK)

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

Pin: 1. Input

devices feature an initial output voltage tolerance ± 0.5%.

2. Ground 3. Output

LP2950 and LP2951 Features:

(Top View)

Low Quiescent Bias Current of 75 µA Low Input–to–Output Voltage Differential of 50 m V at 100 µA and Heatsink surface (shown as terminal 4 in

380 m V at 100 m A case outline drawing) is connected to Pin 2.

5.0 V, 3.3 V or 3.0 V ±0.5% Allows Use as a Regulator or Reference

D SUFFIX

Extremely Tight Line and Load Regulation

PLASTIC PACKAGE Requires Only a 1.0 µF Output Capacitor for Stability CASE 751 (SO–8)

Internal Current and Thermal Limiting

LP2951 Additional Features:

N SUFFIX PLASTIC PACKAGE

Error Output Signals an Out of Regulation Condition

CASE 626

Output Programmable from 1.25 V to 29 V Logic Level Shutdown Input

DM SUFFIX PLASTIC PACKAGE CASE 846A (Micro–8)

Output Input

Sense Feedback

Shutdown

VO Tap

Gnd Error Output

(See Following Page for Ordering Information.) (Top View)

Motorola, Inc. 1996 Rev 4

1MOTOROLA ANALOG IC DEVICE DATA