LM2940CT-9.0 National Semiconductor, LM2940CT-9.0 Datasheet

LM2940CT-9.0

Manufacturer Part Number

LM2940CT-9.0

Description

IC,VOLT REGULATOR,FIXED,+9V,BIPOLAR,SIP,3PIN,PLASTIC

Manufacturer

National Semiconductor

Datasheets

1.LM2940T-9.0.pdf (20 pages)

2.LM2940T-9.0.pdf (19 pages)

3.LM2940T-9.0.pdf (17 pages)

Specifications of LM2940CT-9.0

Rohs Compliant

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LM2940/LM2940C

1A Low Dropout Regulator

General Description

The LM2940/LM2940C positive voltage regulator features the

ability to source 1A of output current with a dropout voltage of

typically 0.5V and a maximum of 1V over the entire temper-

ature range. Furthermore, a quiescent current reduction cir-

cuit has been included which reduces the ground current

when the differential between the input voltage and the output

voltage exceeds approximately 3V. The quiescent current

with 1A of output current and an input-output differential of 5V

is therefore only 30 mA. Higher quiescent currents only exist

when the regulator is in the dropout mode (V

Designed also for vehicular applications, the LM2940/

LM2940C and all regulated circuitry are protected from re-

verse battery installations or 2-battery jumps. During line

transients, such as load dump when the input voltage can

momentarily exceed the specified maximum operating volt-

Typical Application

*Required if regulator is located far from power supply filter.

**C

the regulator. This capacitor must be rated over the same operating temperature range as the regulator and the ESR is critical; see curve.

Ordering Information

Range

≤

−40°C

≤

−40°C

≤

125°C

Temp

0°C

OUT

must be at least 22 μF to maintain stability. May be increased without bound to maintain regulation during transients. Locate as close as possible to

≤

LM2940CT-5.0

LM2940CS-5.0

LM2940SX-5.0 LM2940SX-8.0 LM2940SX-9.0

LM2940LD-5.0

LM2940S-5.0

LM2940T-5.0

LM2940CSX

LM2940LDX

-5.0

5.0

LM2940LD-8.0

LM2940T-8.0

LM2940S-8.0

LM2940LDX

-8.0

8.0

–

8822

LM2940CT-9.0

LM2940CS-9.0

LM2940LD-9.0

LM2940S-9.0

LM2940T-9.0

− V

LM2940CSX

LM2940LDX

OUT

-9.0

9.0

Output Voltage

≤

3V).

LM2940LD-10

LM2940SX-10

age, the regulator will automatically shut down to protect both

the internal circuits and the load. The LM2940/LM2940C can-

not be harmed by temporary mirror-image insertion. Familiar

regulator features such as short circuit and thermal overload

protection are also provided.

Features

■

LM2940T-10

LM2940S-10

LM2940LDX

Dropout voltage typically 0.5V @I

Output current in excess of 1A

Output voltage trimmed before assembly

Reverse battery protection

Internal short circuit current limit

Mirror image insertion protection

-10

–

Product Enhancement tested

882203

LM2940CT-12

LM2940CS-12

LM2940SX-12

LM2940LD-12

LM2940S-12

LM2940CSX

LM2940T-12

LM2940LDX

-12

LM2940CS-15

LM2940CT-15

LM2940LD-15

LM2940CSX

LM2940LDX

= 1A

-15

–

www.national.com

January 2007

Tape and

Package

1k Units

TO-220

TO-263

TO-220

TO-263

Units

Reel

4.5k

LLP

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