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Details, datasheet, quote on part number:LM2595-3.3
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| Part: | LM2595-3.3 |
| Category: | Power Management => Regulators => Switching Regulators |
| Description: | LM2595 - Simple Switcher Power Converter 150 KHZ 1A Step-down Voltage Regulator, Package: to 263, Pin Nb=5 |
| Company: | National Semiconductor Corporation |
| Datasheet: | Download LM2595-3.3 datasheet File size : 958 kB |
| Request For quote: | Find where to buy LM2595-3.3
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Datasheet text preview:
LM2595 SIMPLE SWITCHER Power Converter 150 kHz 1A Step-Down Voltage Regulator
May 1999
LM2595 SIMPLE SWITCHER ® Power Converter 150 kHz 1A Step-Down Voltage Regulator
General Description
The LM2595 series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving a 1A 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. Requiring a minimum number of external components, these regulators are simple to use and include internal frequency compensation, and a fixed-frequency oscillator. The LM2595 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. Available in a standard 5-lead TO-220 package with several different lead bend options, and a 5-lead TO-263 surface mount package. Typically, for output voltages less than 12V, and ambient temperatures less than 50°C, no heat sink is required. A standard series of inductors are available from several different manufacturers optimized for use with the LM2595 series. This feature greatly simplifies the design of switch-mode power supplies. Other features include a guaranteed ± 4% tolerance on output voltage under specified input voltage and output load conditions, and ± 15% on the oscillator frequency. External shutdown is included, featuring typically 85 µA stand-by 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.
Features
n 3.3V, 5V, 12V, and adjustable output versions n Adjustable version output voltage range, 1.2V to 37V ± 4% max over line and load conditions n Available in TO-220 and TO-263 (surface mount) packages n Guaranteed 1A output load current n Input voltage range up to 40V n Requires only 4 external components n Excellent line and load regulation specifications 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 converter
Note: Patent Number 5,382,918.
Typical Application
(Fixed Output Voltage Versions)
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SIMPLE SWITCHER ® and Switchers Made Simple ® are registered trademarks of National Semiconductor Corporation.
© 1999 National Semiconductor Corporation
DS012565
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Connection Diagrams and Ordering Information
Bent and Staggered Leads, Through Hole Package 5 Lead TO-220 (T) Surface Mount Package 5-Lead TO-263 (S)
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Order Number LM2595T-3.3, LM2595T-5.0, LM2595T-12 or LM2595T-ADJ See NS Package Number T05D
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Order Number LM2595S-3.3, LM2595S-5.0, LM2595S-12 or LM2595S-ADJ See NS Package Number TS5B
16-Lead Ceramic Dual-in-Line Package (J)
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Order Number LM2595J-3.3-QML (5962-9687901QEA), LM2595J-5.0-QML (5962-9650301QEA), LM2595J-12-QML (5962-9650201QEA), or LM2595J-ADJ-QML (5962-9650401QEA) See NS Package Number J16A For specifications and information about Military-Aerospace products, please see the Mil-Aero web page at http://www.national.com/appinfo/milaero/index.html.
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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 ON /OFF Pin Input Voltage Feedback Pin Voltage Output Voltage to Ground (Steady State) Power Dissipation Storage Temperature Range ESD Susceptibility 45V -0.3 V +25V -0.3 V +25V -1V Internally limited -65°C to +150°C
Human Body Model (Note 2) Lead Temperature S Package Vapor Phase (60 sec.) Infrared (10 sec.) T Package (Soldering, 10 sec.) Maximum Junction Temperature
2 kV
+215°C +245°C +260°C +150°C
Operating Conditions
Temperature Range Supply Voltage -40°C TJ +125°C 4.5V to 40V
LM2595-3.3 Electrical Characteristics
Specifications with standard type face are for TJ = 25°C, and those with boldface type apply over full Operating Temperature Range. Symbol Parameter Conditions Typ (Note 3) SYSTEM PARAMETERS (Note 5) Test Circuit Figure 1 VOUT Output Voltage 4.75V VIN 40V, 0.1A ILOAD 1A 3.3 3.168/3.135 3.432/3.465 Efficiency VIN = 12V, ILOAD = 1A 78 V V(min) V(max) % LM2595-3.3 Limit (Note 4) Units (Limits)
LM2595-5.0 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 Typ (Note 3) SYSTEM PARAMETERS (Note 5) Test Circuit Figure 1 VOUT Output Voltage 7V VIN 40V, 0.1A ILOAD 1A 5.0 4.800/4.750 5.200/5.250 Efficiency VIN = 12V, ILOAD = 1A 82 V V(min) V(max) % LM2595-5.0 Limit (Note 4) Units (Limits)
LM2595-12 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 Typ (Note 3) SYSTEM PARAMETERS (Note 5) Test Circuit Figure 1 VOUT Output Voltage 15V VIN 40V, 0.1A ILOAD 1A 12.0 11.52/11.40 12.48/12.60 Efficiency VIN = 25V, ILOAD = 1A 90 V V(min) V(max) % LM2595-12 Limit (Note 4) Units (Limits)
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