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PDF LM2675EP Data sheet ( Hoja de datos )
| Número de pieza | LM2675EP | |
| Descripción | Enhanced Plastic SIMPLE SWITCHER Power Converter High Efficiency 1A Step-Down Voltage Regulator | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LM2675EP (archivo pdf) en la parte inferior de esta página. Total 25 Páginas | ||
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May 2004
LM2675EP
Enhanced Plastic SIMPLE SWITCHER® Power Converter
High Efficiency 1A Step-Down Voltage Regulator
General Description
The LM2675EP series of regulators are monolithic inte-
grated circuits built with a LMDMOS process. These regula-
tors provide all the active functions for a step-down (buck)
switching regulator, capable of driving a 1A load current with
excellent line and load regulation. These devices are avail-
able in fixed output voltages of 3.3V, 5.0V, 12V, and an
adjustable output version.
Requiring a minimum number of external components, these
regulators are simple to use and include patented internal
frequency compensation (Patent Nos. 5,382,918 and
5,514,947) and a fixed frequency oscillator.
The LM2675EP series operates at a switching frequency of
260 kHz, thus allowing smaller sized filter components than
what would be needed with lower frequency switching regu-
lators. Because of its very high efficiency (>90%), the cop-
per traces on the printed circuit board are the only heat
sinking needed.
A family of standard inductors for use with the LM2675EP
are available from several different manufacturers. This fea-
ture greatly simplifies the design of switch-mode power sup-
plies using these advanced ICs. Also included in the
datasheet are selector guides for diodes and capacitors
designed to work in switch-mode power supplies.
Other features include a guaranteed ±1.5% tolerance on
output voltage within specified input voltages and output
load conditions, and ±10% on the oscillator frequency. Ex-
ternal shutdown is included, featuring typically 50 µA
stand-by current. The output switch includes current limiting,
as well as thermal shutdown for full protection under fault
conditions.
To simplify the LM2675EP buck regulator design procedure,
there exists computer design software, LM267X Made
Simple version 6.0.
ENHANCED PLASTIC
• Extended Temperature Performance of−40˚C 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
n Efficiency up to 96%
n Available in SO-8, 8-pin DIP and LLP packages
n Computer Design Software LM267X Made Simple
(version 6.0)
n Simple and easy to design with
n Requires only 5 external components
n Uses readily available standard inductors
n 3.3V, 5.0V, 12V, and adjustable output versions
n Adjustable version output voltage range: 1.21V to 37V
n ±1.5% max output voltage tolerance over line and load
conditions
n Guaranteed 1A output load current
n 0.25Ω DMOS Output Switch
n Wide input voltage range: 8V to 40V
n 260 kHz fixed frequency internal oscillator
n TTL shutdown capability, low power standby mode
n Thermal shutdown and current limit protection
Typical Applications
n Simple High Efficiency (>90%) Step-Down (Buck)
Regulator
n Efficient Pre-Regulator for Linear Regulators
n Positive-to-Negative Converter
n Selected Military Applications
n Selected Avionics Applications
Ordering Information
PART NUMBER
LM2675MX-ADJEP
(Notes 1, 2)
VID PART NUMBER
V62/04630-01
TBD
NS PACKAGE NUMBER (Note 3)
M08A
TBD
Note 1: For the following (Enhanced Plastic) versions, check for availability: LM2675LD-12EP, LM2675LDX-12EP,
LM2675LD-3.3EP, LM2675LDX-3.3EP, LM2675LD-5.0EP, LM2675LDX-5.0EP, LM2675LD-ADJEP, LM2675LDX-ADJEP, LM2675M-12EP, LM2675MX-12EP,
LM2675M-3.3EP, LM2675MX-3.3EP, LM2675M-5.0EP, LM2675MX-5.0EP, LM2675M-ADJEP, LM2675N-12EP, LM2675N-3.3EP, LM2675N-5.0EP,
LM2675N-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.
Windows® is a registered trademark of Microsoft Corporation.
© 2004 National Semiconductor Corporation DS200994
www.national.com
www.DataSheet.in
1 page  
Typical Performance Characteristics
Normalized
Output Voltage
Line Regulation
Efficiency
20099403
Drain-to-Source
Resistance
20099404
20099405
Switch Current Limit
Operating
Quiescent Current
20099406
www.DataSheet.in
20099407
5
20099408
www.national.com
5 Page 
LM2675EP Series Buck Regulator Design Procedure (Fixed Output)
(Continued)
PROCEDURE (Fixed Output Voltage Version)
EXAMPLE (Fixed Output Voltage Version)
The capacitor list contains through-hole electrolytic capacitors Surface Mount:
from four different capacitor manufacturers and surface mount 68 µF/10V Sprague 594D Series.
tantalum capacitors from two different capacitor manufacturers. 100 µF/10V AVX TPS Series.
It is recommended that both the manufacturers and the
Through Hole:
manufacturer’s series that are listed in the table be used. A
68 µF/10V Sanyo OS-CON SA Series.
table listing the manufacturers’ phone numbers is located in
220 µF/35V Sanyo MV-GX Series.
Figure 11.
220 µF/35V Nichicon PL Series.
220 µF/35V Panasonic HFQ Series.
3. Catch Diode Selection (D1)
3. Catch Diode Selection (D1)
A. In normal operation, the average current of the catch diode is A. Refer to the table shown in Figure 12. In this example, a 1A,
the load current times the catch diode duty cycle, 1-D (D is the 20V Schottky diode will provide the best performance. If the
switch duty cycle, which is approximately the output voltage
circuit must withstand a continuous shorted output, a higher
divided by the input voltage). The largest value of the catch
current Schottky diode is recommended.
diode average current occurs at the maximum load current and
maximum input voltage (minimum D). For normal operation, the
catch diode current rating must be at least 1.3 times greater
than its maximum average current. However, if the power supply
design must withstand a continuous output short, the diode
should have a current rating equal to the maximum current limit
of the LM2675EP. The most stressful condition for this diode is
a shorted output condition.
B. The reverse voltage rating of the diode should be at least
1.25 times the maximum input voltage.
C. Because of their fast switching speed and low forward
voltage drop, Schottky diodes provide the best performance and
efficiency. This Schottky diode must be located close to the
LM2675EP using short leads and short printed circuit traces.
4. Input Capacitor (CIN)
4. Input Capacitor (CIN)
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