LM2675MX-5.0/NOPB National Semiconductor, LM2675MX-5.0/NOPB Datasheet - Page 18
![IC REG SW 5V 1A STP DN 8-SOIC](/photos/6/56/65640/pkg_m08a_sml.jpg)
LM2675MX-5.0/NOPB
Manufacturer Part Number
LM2675MX-5.0/NOPB
Description
IC REG SW 5V 1A STP DN 8-SOIC
Manufacturer
National Semiconductor
Series
SIMPLE SWITCHER®r
Type
Step-Down (Buck)r
Datasheet
1.LM2675LD-5.0.pdf
(26 pages)
Specifications of LM2675MX-5.0/NOPB
Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
5V
Current - Output
1A
Frequency - Switching
260kHz
Voltage - Input
6.5 ~ 40 V
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
Dc To Dc Converter Type
Step Down
Pin Count
8
Input Voltage
40V
Output Voltage
5V
Switching Freq
260kHz
Output Current
1A
Efficiency
90%
Package Type
SOIC N
Output Type
Fixed
Switching Regulator
Yes
Mounting
Surface Mount
Input Voltage (min)
8V
Operating Temperature Classification
Automotive
Primary Input Voltage
12V
No. Of Outputs
1
No. Of Pins
8
Operating Temperature Range
-40°C To +125°C
Filter Terminals
SMD
Input Voltage Primary Max
40V
Rohs Compliant
Yes
For Use With
LM2675-5.0EVAL - EVALUATION BOARD FOR LM2675-5.0
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power - Output
-
Lead Free Status / Rohs Status
Compliant
Other names
*LM2675MX-5.0
*LM2675MX-5.0/NOPB
LM2675MX-5.0
*LM2675MX-5.0/NOPB
LM2675MX-5.0
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LM2675MX-5.0/NOPB
Manufacturer:
TI/德州仪器
Quantity:
20 000
www.national.com
2. Inductor Selection (L1)
A. Calculate the inductor Volt • microsecond constant E • T (V •
µs), from the following formula:
where V
B. Use the E • T value from the previous formula and match it
with the E • T number on the vertical axis of the Inductor Value
Selection Guide shown in Figure 7.
C. On the horizontal axis, select the maximum load current.
D. Identify the inductance region intersected by the E • T value
and the Maximum Load Current value. Each region is identified
by an inductance value and an inductor code (LXX).
E. Select an appropriate inductor from the four manufacturer’s
part numbers listed in Figure 8. For information on the different
types of inductors, see the inductor selection in the fixed output
voltage design procedure.
3. Output Capacitor Selection (C
A. Select an output capacitor from the capacitor code selection
guide in Figure 16. Using the inductance value found in the
inductor selection guide, step 1, locate the appropriate capacitor
code corresponding to the desired output voltage.
B. Select an appropriate capacitor value and voltage rating,
using the capacitor code, from the output capacitor selection
table in Figure 17. There are two solid tantalum (surface mount)
capacitor manufacturers and four electrolytic (through hole)
capacitor manufacturers to choose from. It is recommended that
both the manufacturers and the manufacturer’s series that are
listed in the table be used. A table listing the manufacturers’
phone numbers is located in Figure 11.
= diode forward voltage drop = 0.5V
LM2675 Series Buck Regulator Design Procedure (Adjustable Output)
(Continued)
PROCEDURE (Adjustable Output Voltage Version)
SAT
= internal switch saturation voltage = 0.25V and V
OUT
)
D
18
2. Inductor Selection (L1)
A. Calculate the inductor Volt • microsecond constant (E • T),
B. E • T = 21.6 (V • µs)
C. I
D. From the inductor value selection guide shown in Figure 7,
the inductance region intersected by the 21.6 (V • µs) horizontal
line and the 1A vertical line is 68 µH, and the inductor code is
L30.
E. From the table in Figure 8, locate line L30, and select an
inductor part number from the list of manufacturers part
numbers.
3. Output Capacitor SeIection (C
A. Use the appropriate row of the capacitor code selection
guide, in Figure 16. For this example, use the 15–20V row. The
capacitor code corresponding to an inductance of 68 µH is C20.
B. From the output capacitor selection table in Figure 17,
choose a capacitor value (and voltage rating) that intersects the
capacitor code(s) selected in section A, C20.
The capacitance and voltage rating values corresponding to the
capacitor code C20 are the:
Surface Mount:
33 µF/25V Sprague 594D Series.
33 µF/25V AVX TPS Series.
Through Hole:
33 µF/25V Sanyo OS-CON SC Series.
120 µF/35V Sanyo MV-GX Series.
120 µF/35V Nichicon PL Series.
120 µF/35V Panasonic HFQ Series.
Other manufacturers or other types of capacitors may also be
used, provided the capacitor specifications (especially the 100
kHz ESR) closely match the characteristics of the capacitors
listed in the output capacitor table. Refer to the capacitor
manufacturers’ data sheet for this information.
LOAD
EXAMPLE (Adjustable Output Voltage Version)
(max) = 1A
OUT
)