MIC2951-3.3BMTR Micrel Semiconductor, MIC2951-3.3BMTR Datasheet

MIC2951-3.3BMTR

Manufacturer Part Number

MIC2951-3.3BMTR

Description

Manufacturer

Micrel Semiconductor

Datasheet

1.MIC2951-3.3BMTR.pdf (16 pages)

Specifications of MIC2951-3.3BMTR

Date_code

04+

Packing_info

8SOICN

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General Description

The MIC2950 and MIC2951 are “bulletproof” micropower volt-

age regulators with very low dropout voltage (typically 40mV

at light loads and 250mV at 100mA), and very low quiescent

current. Like their predecessors, the LP2950 and LP2951, the

quiescent current of the MIC2950/MIC2951 increases only

slightly in dropout, thus prolonging battery life. The MIC2950/

MIC2951 are pin for pin compatible with the LP2950/LP2951,

but offer lower dropout, lower quiescent current, reverse

battery, and automotive load dump protection.

The key additional features and protection offered include

higher output current (150mA), positive transient protec-

tion for up to 60V (load dump), and the ability to survive an

unregulated input voltage transient of –20V below ground

(reverse battery).

The plastic DIP and SOIC versions offer additional

system functions such as programmable output voltage and

logic controlled shutdown. The 3-pin TO-92 MIC2950 is pin-

compatible with the older 5V regulators.

These system functions also include an error ﬂag output that

warns of a low output voltage, which is often due to failing

batteries on the input. This may also be used as a power-on

reset. A logic-compatible shutdown input is also available which

enables the regulator to be switched on and off. This part may

also be pin-strapped for a 5 V output, or programmed from

1.24 V to 29 V with the use of two external resistors.

Block Diagram

July 2005

MIC2950/2951

Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

Control Logic

TTL/CMOS

Unregulated

DC Supply

Input

SHDN

F B

1.23V

60mV

R E F .

Amp.

Error

Error Detection

Comparator

Features

•

Applications

•

182k

60k

High accuracy 3.3, 4.85, or 5V, guaranteed 150mA

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 1.5µF for stability

Current and thermal limiting

Unregulated DC input can withstand –20V reverse battery

and +60V positive transients

Error ﬂag warns of output dropout (MIC2951)

Logic-controlled electronic shutdown (MIC2951)

Output programmable from 1.24V to 29V (MIC2951)

Automotive Electronics

Battery Powered Equipment

Cellular Telephones

SMPS Post-Regulator

Voltage Reference

Avionics

High Efﬁciency Linear Power Supplies

150mA Low-Dropout Voltage Regulator

OUT

S N S

T AP

E R R

GND

MIC2950/2951

1.5µF

330k

5V/150mA

Output

TTL/CMOS

Compatible

Error Output

MIC2950/2951

Micrel, Inc.

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