LM2676EP Enhanced PlasticSIMPLE SWITCHER
®
High Efficiency 3A Step-Down Voltage
Regulator
OBSOLETE
LM2676EP
March 24, 2011
Enhanced Plastic SIMPLE SWITCHER
®
High Efficiency 3A
Step-Down Voltage Regulator
General Description
The LM2676EP 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 3A
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 LM2676EP are available from several
manufacturers to greatly simplify the design process.
The LM2676EP series also has built in thermal shutdown,
current 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.
ENHANCED PLASTIC
• Extended Temperature Performance of −40 to +125°C
• Baseline Control - Single Fab & Assembly Site
• Process Change Notification (PCN)
• Qualification & Reliability Data
• Solder (PbSn) Lead Finish is standard
• Enhanced Diminishing Manufacturing Sources (DMS)
Support
Features
■
Efficiency up to 94%
■
Simple and easy to design with (using off-the-shelf
■
■
■
■
■
■
external components)
150 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
Applications
■
Simple to design, high efficiency (>90%) step-down
switching regulators
■
Efficient system pre-regulator for linear voltage regulators
■
Selected Military Applications
■
Selected Avionics Applications
Ordering Information
PART NUMBER
LM2676S-5.0EP
VID PART NUMBER
V62/04631-01
TBD
NS PACKAGE NUMBER
3)
TS7B
TBD
Note 1: For the following (Enhanced Plastic) versions, check for availability: LM2676SD-12EP, LM2676SD-3.3EP, LM2676SD-5.0EP, LM2676SD-
ADJEP, LM2676SDX-12EP, LM2676SDX-3.3EP, LM2676SDX5.0EP, LM2676SDX-ADJEP, LM2676T-12EP, LM2676T-3.3EP, LM2676T-5.0EP,
LM2676T-ADJEP, LM2676S-12EP, LM2676S-3.3EP, LM2676S-ADJEP, LM2676SX-12EP, LM2676SX-3.3EP, LM2676SX-5.0EP, LM2676SX-ADJEP.
Parts listed with an "X" are provided in Tape & Reel and parts without an "X" are in Rails.
Note 2: FOR ADDITIONAL ORDERING AND PRODUCT INFORMATION, PLEASE VISIT THE ENHANCED PLASTIC WEB SITE AT: www.national.com/
mil
Note 3: Refer to package details under Physical Dimensions
SIMPLE SWITCHER
®
is a registered trademark of National Semiconductor Corporation
© 2011 National Semiconductor Corporation
200996
Print Date/Time: 2011/03/24 16:39:24
www.national.com
200996 Version 2 Revision 3
TI [ TEXAS INSTRUMENTS ]
