LM2678T-ADJ/NOPB National Semiconductor, LM2678T-ADJ/NOPB Datasheet

LM2678T-ADJ/NOPB

Manufacturer Part Number

LM2678T-ADJ/NOPB

Description

IC REG SIMPLE SWITCHER TO-220-7

Manufacturer

National Semiconductor

Series

SIMPLE SWITCHER®r

Type

Step-Down (Buck)r

Datasheets

1.LM2678SD-3.3NOPB.pdf (26 pages)

2.LM2678T-ADJNOPB.pdf (6 pages)

Specifications of LM2678T-ADJ/NOPB

Internal Switch(s)

Yes

Synchronous Rectifier

Number Of Outputs

Voltage - Output

1.2 ~ 37 V

Current - Output

Frequency - Switching

260kHz

Voltage - Input

8 ~ 40 V

Operating Temperature

-40°C ~ 125°C

Mounting Type

Through Hole

Package / Case

TO-220-7 (Bent and Staggered Leads)

Current, Input Bias

85 nA

Current, Output

5 A

Current, Supply

4.2 mA

Frequency, Oscillator

260 kHz

Package Type

TO-220

Regulator Type

Buck (Step-Down)

Resistance, Thermal, Junction To Case

2 °C/W

Temperature, Operating, Range

-40 to +125 °C

Voltage, Input

8 to 40 V

Voltage, Output

1.2 to 37 V

Primary Input Voltage

40V

No. Of Outputs

Output Voltage

37V

Output Current

No. Of Pins

Operating Temperature Range

-40Â°C To +125Â°C

Msl

MSL 1 - Unlimited

Filter Terminals

Through Hole

Rohs Compliant

Yes

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Power - Output

Lead Free Status / Rohs Status

RoHS Compliant part Electrostatic Device

Other names

*LM2678T-ADJ
*LM2678T-ADJ/NOPB
LM2678T-ADJ

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Meier Automation Equipment Co., Limited

Part Number:

LM2678T-ADJ/NOPB

Manufacturer:

TI/德州仪器

Quantity:

20 000

Company:

Amily Shenzhen XNWY Technology Co., Ltd

Part Number:

LM2678T-ADJ/NOPB

Current page: 1 of 6
Download datasheet (446Kb)

LM2678

SIMPLE SWITCHER

Voltage Regulator

General Description

The LM2678 series of regulators are monolithic integrated

circuits which provide all of the active functions for a step-

down (buck) switching regulator capable of driving up to 5A

loads with excellent line and load regulation characteristics.

High efficiency (>90%) is obtained through the use of a low

ON-resistance DMOS power switch. The series consists of

fixed output voltages of 3.3V, 5V and 12V and an adjustable

output version.

The SIMPLE SWITCHER concept provides for a complete

design using a minimum number of external components. A

high fixed frequency oscillator (260KHz) allows the use of

physically smaller sized components. A family of standard in-

ductors for use with the LM2678 are available from several

manufacturers to greatly simplify the design process.

The LM2678 series also has built in thermal shutdown, cur-

rent limiting and an ON/OFF control input that can power

down the regulator to a low 50μA quiescent current standby

condition. The output voltage is guaranteed to a ±2% toler-

ance. The clock frequency is controlled to within a ±11%

tolerance.

Typical Application

SIMPLE SWITCHER

is a registered trademark of National Semiconductor Corporation

High Efficiency 5A Step-Down

Features

■

Applications

■

Efficiency up to 92%

Simple and easy to design with (using off-the-shelf

external components)

120 mΩ DMOS output switch

3.3V, 5V and 12V fixed output and adjustable (1.2V to

37V ) versions

50μA standby current when switched OFF

±2%maximum output tolerance over full line and load

conditions

Wide input voltage range: 8V to 40V

260 KHz fixed frequency internal oscillator

−40 to +125°C operating junction temperature range

Simple to design, high efficiency (>90%) step-down

switching regulators

Efficient system pre-regulator for linear voltage regulators

Battery chargers

10088603

Related parts for LM2678T-ADJ/NOPB

LM2678T-ADJ/NOPB Summary of contents

Page 1

... The output voltage is guaranteed to a ±2% toler- ance. The clock frequency is controlled to within a ±11% tolerance. Typical Application SIMPLE SWITCHER ® registered trademark of National Semiconductor Corporation ® High Efficiency 5A Step-Down Features ■ Efficiency up to 92% ■ ...

Page 2

... LM2678SDX-3.3 5.0 LM2678SD-5.0 5.0 LM2678SDX-5.0 ADJ LM2678SD-ADJ ADJ LM2678SDX-ADJ 10088601 LM2678T-3.3, LM2678T-5.0, LM2678T-12 or LM2678T-ADJ See NSC Package Number TA07B Top View 10088641 LLP-14 See NS package Number SRC14A Package Marking S0003BB 250 Units on Tape and Reel S0003BB 2500 Units on Tape and Reel ...

Page 3

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Input Supply Voltage ON/OFF Pin Voltage Switch Voltage to Ground (Note 12) Boost Pin Voltage Feedback Pin Voltage Power Dissipation Electrical Characteristics of operation, −40°C to 125°C. Specifications appearing in normal type apply for T LM2678-3 ...

Page 4

All Output Voltage Versions Electrical Characteristics Limits appearing in bold type face apply over the entire junction temperature range of operation, −40°C to 125°C. Specifications appearing in normal type apply for T justable versions and V =24V for the 12V ...

Page 5

Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings indicate conditions under which of the device is guaranteed. Operating Ratings do not imply guaranteed performance limits. For guaranteed performance limits and associated ...

Page 6

... TO-220 Power Package Order Number LM2678T-3.3, LM2678T-5.0, LM2678T-12 or LM2678T-ADJ NS Package Number TA07B 14-Lead LLP Package NS Package Number SRC14A 25 ...

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