|
Details, datasheet, quote on part number:LM2594N-5.0
| |
| Part: | LM2594N-5.0 |
| Category: | Power Management => Regulators => Switching Regulators |
| Description: | LM2594 - Simple Switcher Power Converter 150 KHZ 0.5A Step-down Voltage Regulator, Package: Soic Narrow, Pin Nb=8 |
| Company: | National Semiconductor Corporation |
| Datasheet: | Download LM2594N-5.0 datasheet File size : 757 kB |
| Request For quote: | Find where to buy LM2594N-5.0
|
| |
Datasheet text preview:
LM2594/LM2594HV SIMPLE SWITCHER Power Converter 150 kHz 0.5A Step-Down Voltage Regulator
December 1999
LM2594/LM2594HV SIMPLE SWITCHER ® Power Converter 150 kHz 0.5A Step-Down Voltage Regulator
General Description
The LM2594/LM2594HV series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving a 0.5A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3V, 5V, 12V, and an adjustable output version, and are packaged in a 8-lead DIP and a 8-lead surface mount package. Requiring a minimum number of external components, these regulators are simple to use and feature internal frequency compensation, a fixed-frequency oscillator, and improved line and load regulation specifications. The LM2594/LM2594HV series operates at a switching frequency of 150 kHz thus allowing smaller sized filter components than what would be needed with lower frequency switching regulators. Because of its high efficiency, the copper traces on the printed circuit board are normally the only heat sinking needed. A standard series of inductors (both through hole and surface mount types) are available from several different manufacturers optimized for use with the LM2594/LM2594HV series. This feature greatly simplifies the design of switch-mode power supplies. Other features include a guaranteed ± 4% tolerance on output voltage under all conditions of input voltage and output load conditions, and ± 15% on the oscillator frequency. External shutdown is included, featuring typically 85 µA standby current. Self protection features include a two stage frequency reducing current limit for the output switch and an over temperature shutdown for complete protection under fault conditions. The LM2594HV is for applications requiring an input voltage up to 60V.
Features
n 3.3V, 5V, 12V, and adjustable output versions n Adjustable version output voltage range, 1.2V to 37V (57V for the HV version) ± 4% max over line and load conditions n Available in 8-pin surface mount and DIP-8 package n Guaranteed 0.5A output current n Input voltage range up to 60V n Requires only 4 external components n 150 kHz fixed frequency internal oscillator n TTL Shutdown capability n Low power standby mode, IQ typically 85 µA n High Efficiency n Uses readily available standard inductors n Thermal shutdown and current limit protection
Applications
n n n n Simple high-efficiency step-down (buck) regulator Efficient pre-regulator for linear regulators On-card switching regulators Positive to Negative convertor
Typical Application
(Fixed Output Voltage Versions)
DS012439-1
SIMPLE SWITCHER and Switchers Made SimpleTM are registered trademarks of National Semiconductor Corporation.
© 2000 National Semiconductor Corporation
DS012439
www.national.com
LM2594/LM2594HV
Connection Diagrams and Order Information
8-Lead DIP (N) 8-Lead Surface Mount (M)
DS012439-2
Top View Order Number LM2594N-3.3, LM2594N-5.0, LM2594N-12 or LM2594N-ADJ LM2594HVN-3.3, LM2594HVN-5.0, LM2594HVN-12 or LM2594HVN-ADJ See NS Package Number N08E
DS012439-3
Top View Order Number LM2594M-3.3, LM2594M-5.0, LM2594M-12 or LM2594M-ADJ LM2594HVM-3.3, LM2594HVM-5.0, LM2594HVM-12 or LM2594HVM-ADJ See NS Package Number M08A
*No internal connection, but should be soldered to pc board for best heat transfer.
Patent Number 5,382,918.
www.national.com
2
LM2594/LM2594HV
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Maximum Supply Voltage LM2594 LM2594HV ON /OFF Pin Input Voltage Feedback Pin Voltage Output Voltage to Ground (Steady State) Power Dissipation Storage Temperature Range ESD Susceptibility 45V 60V -0.3 V +25V -0.3 V +25V -1V Internally limited -65°C to +150°C
Human Body Model (Note 2) Lead Temperature M8 Package Vapor Phase (60 sec.) Infrared (15 sec.) N Package (Soldering, 10 sec.) Maximum Junction Temperature
2 kV
+215°C +220°C +260°C +150°C
Operating Conditions
Temperature Range Supply Voltage LM2594 LM2594HV -40°C TJ +125°C 4.5V to 40V 4.5V to 60V
LM2594/LM2594HV-3.3 Electrical Characteristics
Specifications with standard type face are for TJ = 25°C, and those with boldface type apply over full Operating Temperature Range.VINmax = 40V for the LM2594 and 60V for the LM2594HV. Symbol Parameter Conditions LM2594/LM2594HV-3.3 Typ (Note 3) SYSTEM PARAMETERS (Note 5) Test Circuit Figure 1 VOUT Output Voltage 4.75V VIN VINmax, 0.1A ILOAD 0.5A 3.3 3.168/3.135 3.432/3.465 Efficiency VIN = 12V, ILOAD = 0.5A 80 V V(min) V(max) % Limit (Note 4) Units (Limits)
LM2594/LM2594HV-5.0 Electrical Characteristics
Specifications with standard type face are for TJ = 25°C, and those with boldface type apply over full Operating Temperature Range Symbol Parameter Conditions LM2594/LM2594HV-5.0 Typ (Note 3) SYSTEM PARAMETERS (Note 5) Test Circuit Figure 1 VOUT Output Voltage 7V VIN VINmax, 0.1A ILOAD 0.5A 5.0 4.800/4.750 5.200/5.250 Efficiency VIN = 12V, ILOAD = 0.5A 82 V V(min) V(max) % Limit (Note 4) Units (Limits)
LM2594/LM2594HV-12 Electrical Characteristics
Specifications with standard type face are for TJ = 25°C, and those with boldface type apply over full Operating Temperature Range Symbol Parameter Conditions LM2594/LM2594HV-12 Typ (Note 3) SYSTEM PARAMETERS (Note 5) Test Circuit Figure 1 VOUT Output Voltage 15V VIN VINmax, 0.1A ILOAD 0.5A 12.0 11.52/11.40 12.48/12.60 Efficiency VIN = 25V, ILOAD = 0.5A 88 V V(min) V(max) % Limit (Note 4) Units (Limits)
3
www.national.com
|
|
