LM2825N-5.0/NOPB National Semiconductor, LM2825N-5.0/NOPB Datasheet

IC CONVERTER DC/DC 1A 24-DIP

LM2825N-5.0/NOPB

Manufacturer Part Number
LM2825N-5.0/NOPB
Description
IC CONVERTER DC/DC 1A 24-DIP
Manufacturer
National Semiconductor
Type
Step-Down (Buck)r
Datasheet

Specifications of LM2825N-5.0/NOPB

Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
5V
Current - Output
1A
Frequency - Switching
150kHz
Voltage - Input
7 ~ 40 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Through Hole
Package / Case
24-DIP (0.600", 15.24mm)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power - Output
-
Other names
*LM2825N-5.0
*LM2825N-5.0/NOPB
LM2825N-5.0
© 1997 National Semiconductor Corporation
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
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/in
n 24-pin DIP package profile (1.25 x 0.54 x 0.26 inches)
Standard Application
(Fixed output voltage versions)
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
versions)
30 dB µV/m
37 dB µV/m
46 dB µV/m
3
DS012661
DS012661-1
DS012661-27
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, I
n High efficiency, typically 80%
n
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
“NC (Do not use)” pins: See Figure 11 .
Ordering Information
Order Number LM2825N-3.3, LM2825N-5.0, LM2825N-12,
LM2825N-ADJ or LM2825HN-ADJ
See NS Package Number NA24F
±
4% output voltage tolerance
Top View
Q
typically 65 µA
www.national.com
May 1997
DS012661-2

Related parts for LM2825N-5.0/NOPB

LM2825N-5.0/NOPB Summary of contents

Page 1

... Efficient pre-regulator for linear regulators n Distributed power systems n DC/DC module replacement Connection Diagram DS012661-27 “NC (Do not use)” pins: See Figure 11 . Top View DS012661-1 Ordering Information Order Number LM2825N-3.3, LM2825N-5.0, LM2825N-12, LM2825N-ADJ or LM2825HN-ADJ See NS Package Number NA24F May 1997 typically 65 µA Q DS012661-2 www.national.com ...

Page 2

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Maximum Input Supply ( SD/SS Pin Input Voltage (Note 2) Output Pin Voltage (3.3V, 5.0V and ADJ) (12V and H-ADJ) ADJ Pin Voltage (ADJ, H-ADJ only) ...

Page 3

LM2825-12 Electrical Characteristics Specifications with standard type face are for T ture Range. Test Circuit Figure 2 . Symbol Parameter V Output Voltage 15V OUT Line Regulation 15V I LOAD Load Regulation 0.1A = 24V 24V, I ...

Page 4

All Output Voltage Versions Electrical Characteristics Specifications with standard type face are for T = 12V for 3.3V, 5.0V and ADJ versions, V less otherwise specified Symbol Parameter I DC Output Current Limit SD/SS Pin ...

Page 5

Typical Performance Characteristics = 12V for 3.3V, 5.0V and ADJ versions Normalized Output Voltage DS012661-3 Line Regulation DS012661-6 Operating Quiescent Current DS012661-9 (Circuits of Figure 2 and Figure 3 ) Unless otherwise specified, = 24V for 12V ...

Page 6

Typical Performance Characteristics = 12V for 3.3V, 5.0V and ADJ versions Soft-start DS012661-12 Switch Current Limit Load Transient Response for Continuous Mode = 20V 5V 250 mA to 750 OUT ...

Page 7

Test Circuit * Optional—Required if package is more than 6" away from main filter or bypass capacitor. * *Optional Soft-start Capacitor = 40V (max 3. 12V @ 0.75A OUT * Optional—Required ...

Page 8

Application Information It is especially useful in situations where the input power source is limited in the amount of current it can deliver, since you avoid loading down this type of power supply. Under some operating conditions, a Soft-start capacitor ...

Page 9

Application Information (Continued) = −40˚C to −25˚C AND T OUTPUT CURRENT DERATING FOR the lower temperature extremes, the switch current limit drops off sharply result, a lower output current is available in this temperature range. ...

Page 10

Application Information OUTPUT CURRENT DERATING FOR T Due to the limited switch current, the LM2825 cannot supply the full one ampere output current over the entire input and output voltage range. Figure 8 shows the typical available output current for ...

Page 11

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 Note: Holes are not shown. “No Connect Pins” are connected to copper pads for thermal reasons ...

Page 12

... Physical Dimensions inches (millimeters) unless otherwise noted 24-Lead (0.600" Wide) Molded Dual-In-Line Package Order Number LM2825N-3.3, LM2825N-5.0, LM2825N12, LM2825N-ADJ or LM2825HN-ADJ LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DE- VICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMI- CONDUCTOR CORPORATION ...

Related keywords