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Part: LM2673LDX-3.3
Category:
Power Management
-> Regulators
-> Switching Regulators
Description: LM2673 - Simple Switcher 3A Step-down Voltage Regulator With Adjustable Current Limit, Package: Evaluation Board, Pin Nb=-
Company: National Semiconductor Corporation
Datasheet: Download LM2673LDX-3.3 datasheet File size : 355 kB
Request For quote: Find where to buy LM2673LDX-3.3
Datasheet text preview:
LM2673 SIMPLE SWITCHER 3A Step-Down Voltage Regulator with Adjustable Current Limit
April 2003
LM2673 SIMPLE SWITCHER ® 3A Step-Down Voltage Regulator with Adjustable Current Limit
General Description
The LM2673 series of regulators are monolithic integrated circuits which provide all of the active functions for a stepdown (buck) switching regulator capable of driving up to 3A loads with excellent line and load regulation characteristics. High efficiency ( > 90%) is obtained through the use of a low ON-resistance DMOS power switch. The series consists of fixed output voltages of 3.3V, 5V and 12V and an adjustable output version. The SIMPLE SWITCHER concept provides for a complete design using a minimum number of external components. A high fixed frequency oscillator (260KHz) allows the use of physically smaller sized components. A family of standard inductors for use with the LM2673 are available from several manufacturers to greatly simplify the design process. Other features include the ability to reduce the input surge current at power-ON by adding a softstart timing capacitor to gradually turn on the regulator. The LM2673 series also has built in thermal shutdown and resistor programmable current limit of the power MOSFET switch to protect the device and load circuitry under fault conditions. The output voltage is guaranteed to a ± 2% tolerance. The clock frequency is controlled to within a ± 11% tolerance.
Features
n Efficiency up to 94% n Simple and easy to design with (using off-the-shelf external components) n Resistor programmable peak current limit over a range of 2A to 5A. n 150 m DMOS output switch n 3.3V, 5V and 12V fixed output and adjustable (1.2V to 37V ) versions n ± 2%maximum output tolerance over full line and load conditions n Wide input voltage range: 8V to 40V n 260 KHz fixed frequency internal oscillator n Softstart capability n -40 to +125°C operating junction temperature range
Applications
n Simple to design, high efficiency ( > 90%) step-down switching regulators n Efficient system pre-regulator for linear voltage regulators n Battery chargers
Typical Application
10091303
SIMPLE SWITCHER ® is a registered trademark of National Semiconductor Corporation.
© 2003 National Semiconductor Corporation
DS100913
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LM2673
Connection Diagrams and Ordering Information
TO-263 Package Top View TO-220 Package Top View
10091301
10091302
Order Number LM2673S-3.3, LM2673S-5.0, LM2673S-12 or LM2673S-ADJ See NSC Package Number TS7B Top View
Order Number LM2673T-3.3, LM2673T-5.0, LM2673T-12 or LM2673T-ADJ See NSC Package Number TA07B
10091335
LLP-14 See NS package Number LDC14A
Ordering Information for LLP Package
Output Voltage 12 12 3.3 3.3 5.0 5.0 ADJ ADJ Order Information LM2673LD-12 LM2673LDX-12 LM2673LD-3.3 LM2673LDX-3.3 LM2673LD-5.0 LM2673LDX-5.0 LM2673LD-ADJ LM2673LDX-ADJ Package Marking S0000AB S0000AB S00008B S00008B S00009B S00009B S0000BB S0000BB Supplied As 250 Units on Tape and Reel 2500 Units on Tape and Reel 250 Units on Tape and Reel 2500 Units on Tape and Reel 250 Units on Tape and Reel 2500 Units on Tape and Reel 250 Units on Tape and Reel 2500 Units on Tape and Reel
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LM2673
Absolute Maximum Ratings
(Note 1)
Storage Temperature Range Soldering Temperature Wave Infrared Vapor Phase
-65°C to 150°C 4 sec, 260°C 10 sec, 240°C 75 sec, 219°C
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Input Supply Voltage Softstart Pin Voltage Switch Voltage to Ground Boost Pin Voltage Feedback Pin Voltage Power Dissipation ESD (Note 2) 45V -0.1V to 6V -1V to VIN VSW + 8V -0.3V to 14V Internally Limited 2 kV
Operating Ratings
Supply Voltage Junction Temperature Range (TJ) 8V to 40V -40°C to 125°C
Electrical Characteristics LM2673-3.3
Symbol VOUT Parameter Output Voltage Efficiency
Limits appearing in bold type face apply over the entire junction temperature range of operation, -40°C to 125°C. Specifications appearing in normal type apply for TA = TJ = 25°C. RADJ = 8.2K
Conditions VIN = 8V to 40V, 100mA IOUT 3A VIN = 12V, ILOAD = 3A
Typical (Note 3) 3.3 86
Min (Note 4) 3.234/3.201
Max (Note 4) 3.366/3.399
Units V %
LM2673-5.0
Symbol VOUT Parameter Output Voltage Efficiency Conditions VIN = 8V to 40V, 100mA IOUT 3A VIN = 12V, ILOAD = 3A Typical (Note 3) 5.0 88 Min (Note 4) 4.900/4.850 Max (Note 4) 5.100/5.150 V % Units
LM2673-12
Symbol VOUT Parameter Output Voltage Efficiency Conditions VIN = 15V to 40V, 100mA IOUT 3A VIN = 24V, ILOAD = 3A Typical (Note 3) 12 94 Min (Note 4) 11.76/11.64 Max (Note 4) 12.24/12.36 V % Units
LM2673-ADJ
Symbol VFB Parameter Feedback Voltage Efficiency Conditions VIN = 8V to 40V, 100mA IOUT 3A VOUT Programmed for 5V VIN = 12V, ILOAD = 3A Typ (Note 3) 1.21 88 Min (Note 4) 1.186/1.174 Max (Note 4) 1.234/1.246 V % Units
3
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