Voltage Regulator. LM2679T-12 Datasheet

LM2679T-12 Regulator. Datasheet pdf. Equivalent

LM2679T-12 Datasheet
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Part LM2679T-12
Description 5-A Step-Down Voltage Regulator
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LM2679
SNVS026O – MARCH 2000 – REVISED JUNE 2016
LM2679 SIMPLE SWITCHER® 5-A Step-Down Voltage Regulator
With Adjustable Current Limit
1 Features
1 Efficiency Up to 92%
• Simple and Easy to Design Using Off-The-Shelf
External Components
• Resistor Programmable Peak Current Limit Over a
Range of 3 A to 7 A
• 120-mΩ DMOS Output Switch
• 3.3-V, 5-V, 12-V Fixed Output and Adjustable
(1.2 V to 37 V) Versions
• ±2% Maximum Output Tolerance Over Full Line
and Load Conditions
• Wide Input Voltage Range: 8 V to 40 V
• 260-kHz Fixed Frequency Internal Oscillator
• Soft-Start Capability
40 to 125°C Operating Junction Temperature
Range
2 Applications
• Simple-to-Design, High Efficiency (>90%)
Step-Down Switching Regulators
• Efficient System Preregulator for Linear Voltage
Regulators
• Battery Chargers
3 Description
The LM2679 series of regulators are monolithic
integrated circuits which provide all of the active
functions for a step-down (buck) switching regulator
capable of driving up to 5-A 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 3.3 V, 5 V, and 12 V 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
(260 kHz) allows the use of physically smaller sized
components. A family of standard inductors for use
with the LM2679 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 soft-start
timing capacitor to gradually turn on the regulator.
The LM2679 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 specified to a ±2% tolerance. The clock
frequency is controlled to within a ±11% tolerance.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TO-263 (7)
10.10 mm × 8.89 mm
LM2679
TO-220 (7)
14.986 mm × 10.16 mm
VSON (14)
6.00 mm × 5.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application
Feedback
0.01 PF
Input
Voltage
8V to 40V
CIN + + +
3 x 15 PF/50V
VIN
0.47 PF
LM2679 - 5.0
Boost
Softstart
5.6k
1 nF
Current
Limit
Adjust
Switch
Ground Output
Output
L
Voltage
22 PH
5V/5A
+
+ COUT
6TQ045S
2 x 180 PF/16V
ICL =
37,125
RADJ Copyright © 2016, Texas Instruments Incorporated
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.



Texas Instruments LM2679T-12
LM2679
SNVS026O – MARCH 2000 – REVISED JUNE 2016
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration and Functions ......................... 3
6 Specification........................................................... 4
6.1 Absolute Maximum Ratings ...................................... 4
6.2 ESD Ratings.............................................................. 4
6.3 Recommended Operating Conditions....................... 4
6.4 Thermal Information .................................................. 5
6.5 Electrical Characteristics – 3.3 V .............................. 5
6.6 Electrical Characteristics – 5 V ................................. 5
6.7 Electrical Characteristics – 12 V ............................... 6
6.8 Electrical Characteristics – Adjustable...................... 6
6.9 Electrical Characteristics – All Output Voltage
Versions ..................................................................... 6
6.10 Typical Characteristics ............................................ 7
7 Detailed Description .............................................. 9
7.1 Overview ................................................................... 9
7.2 Functional Block Diagram ......................................... 9
7.3 Feature Description................................................... 9
7.4 Device Functional Modes........................................ 10
8 Application and Implementation ........................ 11
8.1 Application Information............................................ 11
8.2 Typical Application .................................................. 14
9 Power Supply Recommendations...................... 26
10 Layout................................................................... 26
10.1 Layout Guidelines ................................................. 26
10.2 Layout Example .................................................... 27
11 Device and Documentation Support ................. 28
11.1 Related Documentation......................................... 28
11.2 Receiving Notification of Documentation Updates 28
11.3 Community Resources.......................................... 28
11.4 Trademarks ........................................................... 28
11.5 Electrostatic Discharge Caution ............................ 28
11.6 Glossary ................................................................ 28
12 Mechanical, Packaging, and Orderable
Information ........................................................... 28
12.1 VSON Package Devices ....................................... 28
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision N (April 2013) to Revision O
Page
• Added ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation
section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and
Mechanical, Packaging, and Orderable Information section. ................................................................................................. 1
• Removed all references to Computer Design Software LM267X Made Simple (Version 6.0).............................................. 1
Changes from Revision M (April 2013) to Revision N
Page
• Changed layout of National Data Sheet to TI format ........................................................................................................... 15
2
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Copyright © 2000–2016, Texas Instruments Incorporated



Texas Instruments LM2679T-12
www.ti.com
5 Pin Configuration and Functions
KTW Package
7-Pin TO-263
Top View
Not to scale
LM2679
SNVS026O – MARCH 2000 – REVISED JUNE 2016
Not to scale
NDZ Package
7-Pin TO-220
Top View
7
6
5
4
3
2
1
SS
FB
Current_adjust
GND
CB
Input
Switch_output
NHM Package
14-Pin VSON
Top View
NC 1
Input 2
Input 3
CB 4
NC 5
Current_adjust 6
FB 7
DAP
14 Switch_output
13 Switch_output
12 Switch_output
11 NC
10 NC
9 GND
8 SS
Connect DAP to pin 9
NAME
Switch output
PIN
TO-263, TO-220
1
VSON
12, 13, 14
Input
2
2, 3
CB
3
4
GND
4
9
Current adjust
5
6
FB
6
7
SS
7
8
NC
1, 5, 10, 11
Not to scale
Pin Functions
I/O
DESCRIPTION
O
Source pin of the internal high side FET. This is a switching node. Attached
this pin to an inductor and the cathode of the external diode.
Supply input pin to collector pin of high side FET. Connect to power supply
I and input bypass capacitors CIN. Path from VIN pin to high frequency
bypass CIN and GND must be as short as possible.
I
Boot-strap capacitor connection for high-side driver. Connect a high quality
100-nF capacitor from CB to VSW pin.
Power ground pins. Connect to system ground. Ground pins of CIN and
COUT. Path to CIN must be as short as possible.
I
Current limit adjust pin. Connect a resistor from this pin to GND to set the
current limit of the part.
Feedback sense input pin. Connect to the midpoint of feedback divider to
I set VOUT for adjustable version or connect this pin directly to the output
capacitor for a fixed output version.
I
Soft-start pin. Connect a capacitor from this pin to GND to control the output
voltage ramp. If the feature not desired, the pin can be left floating
— No connect pins
Copyright © 2000–2016, Texas Instruments Incorporated
Product Folder Links: LM2679
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