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PDF LM2825N-3.3 Data sheet ( Hoja de datos )
| Número de pieza | LM2825N-3.3 | |
| Descripción | Integrated Power Supply 1A DC-DC Converter | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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May 1997
LM2825
Integrated Power Supply 1A DC-DC Converter
General Description
The LM2825 is a complete 1A DC-DC Buck converter pack-
aged in a 24-lead molded Dual-In-Line integrated circuit
package.
Contained within the package are all the active and passive
components for a high efficiency step-down (buck) switching
regulator. Available in fixed output voltages of 3.3V, 5V and
12V, as well as two adjustable versions, these devices can
provide up to 1A of load current with fully guaranteed electri-
cal specifications.
Self-contained, this converter is also fully protected from out-
put fault conditions, such as excessive load current, short
circuits, or excessive temperatures.
Highlights
n No external components required (fixed output voltage
versions)
n Integrated circuit reliability
n MTBF over 20 million hours
n Radiated EMI meets Class B stipulated by CISPR 22
n High power density, 35 W/in3
n 24-pin DIP package profile (1.25 x 0.54 x 0.26 inches)
Features
n Minimum design time required
n 3.3V, 5V and 12V fixed output versions
n Two adjustable versions allow 1.23V to 15V outputs
n Wide input voltage range, up to 40V
n Low-power standby mode, IQ typically 65 µA
n High efficiency, typically 80%
n ±4% output voltage tolerance
n Excellent line and load regulation
n TTL shutdown capability/programmable Soft-start
n Thermal shutdown and current limit protection
n −40˚C to +85˚C ambient temperature range
Applications
n Simple high-efficiency step-down (buck) regulator
n On-card switching regulators
n Efficient pre-regulator for linear regulators
n Distributed power systems
n DC/DC module replacement
Connection Diagram
Standard Application
(Fixed output voltage versions)
DS012661-27
DS012661-1
Radiated EMI
Radiated emission of electromagnetic fields is measured at
10m distance. The emission levels are within the Class B
limits stipulated by CISPR 22.
30. . . .230 MHz
230. . . .1000 MHz
1. . . .10 GHz
30 dB µV/m
37 dB µV/m
46 dB µV/m
“NC (Do not use)” pins: See Figure 11.
Top View
DS012661-2
Ordering Information
Order Number LM2825N-3.3, LM2825N-5.0, LM2825N-12,
LM2825N-ADJ or LM2825HN-ADJ
See NS Package Number NA24F
© 1997 National Semiconductor Corporation DS012661
www.national.com
1 page  
Typical Performance Characteristics (Circuits of Figure 2 and Figure 3) Unless otherwise specified,
VIN = 12V for 3.3V, 5.0V and ADJ versions, VIN = 24V for 12V and H-ADJ versions, ILOAD = 100 mA, TA = 25˚C
Normalized
Output Voltage
Efficiency
Dropout Voltage
Line Regulation
DS012661-3
DS012661-4
Load Regulation
Output
Ripple Voltage
DS012661-5
DS012661-6
DS012661-7
Operating
Quiescent Current
Shutdown
Quiescent Current
DS012661-8
Switching Frequency
DS012661-9
DS012661-10
DS012661-11
5 www.national.com
5 Page 
Application Information (Continued)
FIGURE 10. Typical Circuits Using Shutdown /Soft-start Features
TYPICAL THROUGH HOLE PC BOARD LAYOUT (2X SIZE), SINGLE SIDED, THROUGH HOLE PLATED
DS012661-25
Note: Holes are not shown.
“No Connect Pins” are connected to copper pads for thermal reasons only and must remain electrically isolated.
FIGURE 11. 2X Printed Circuit Board Layout
DS012661-26
11 www.national.com
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LM2825N-3.3.PDF ] | |
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