Voltage Regulator. LM2672N-12 Datasheet

LM2672N-12 Regulator. Datasheet pdf. Equivalent

LM2672N-12 Datasheet
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Part LM2672N-12
Description High Efficiency 1-A Step-Down Voltage Regulator
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LM2672
SNVS136L – SEPTEMBER 1998 – REVISED JUNE 2016
LM2672 SIMPLE SWITCHER® Power Converter High Efficiency 1-A Step-Down Voltage
Regulator with Features
1 Features
1 Efficiency up to 96%
• Available in 8-Pin SOIC and PDIP Packages
• Requires only 5 External Components
• 3.3-V, 5-V, 12-V, and Adjustable Output Versions
• Adjustable Version Output Voltage Range: 1.21 V
to 37 V
• ±1.5% Maximum Output Voltage Tolerance Over
Line and Load Conditions
• Specified 1-A Output Load Current
• Wide Input Voltage Range: 8 V to 40 V
• 260-kHz Fixed Frequency Internal Oscillator
• TTL Shutdown Capability, Low Power Standby
Mode
• Soft-Start and Frequency Synchronization
• Thermal Shutdown and Current Limit Protection
2 Applications
• Simple High Efficiency (>90%) Step-Down (Buck)
Regulator
• Efficient Preregulator for Linear Regulators
3 Description
The LM2672 series of regulators are monolithic
integrated DC-DC converter built with a LMDMOS
process. These regulators provide all the active
functions for a step-down (buck) switching regulator,
capable of driving a 1-A load current with excellent
line and load regulation. These devices are available
in fixed output voltages of 3.3 V, 5 V, 12 V, and an
adjustable output version.
Requiring a minimum number of external
components, these regulators are simple to use and
include patented internal frequency compensation,
fixed frequency oscillator, external shutdown, soft-
start, and frequency synchronization.
The LM2672 series operates at a switching frequency
of 260 kHz, thus allowing smaller sized filter
components than what is required with lower
frequency switching regulators. Because of its very
high efficiency (>90%), the copper traces on the
printed-circuit board are the only heat sinking
required.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
SOIC (8)
5.00 mm × 6.20 mm
LM2672
PDIP (8)
10.16 mm × 6.60 mm
WSON (16)
5.00 mm × 5.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application
Fixed output voltage versions
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 LM2672N-12
LM2672
SNVS136L – SEPTEMBER 1998 – REVISED JUNE 2016
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Description (continued)......................................... 3
6 Pin Configuration and Functions ......................... 3
7 Specifications......................................................... 4
7.1 Absolute Maximum Ratings ...................................... 4
7.2 ESD Ratings.............................................................. 4
7.3 Recommended Operating Conditions....................... 4
7.4 Thermal Information .................................................. 4
7.5 Electrical Characteristics – 3.3 V .............................. 5
7.6 Electrical Characteristics – 5 V ................................. 5
7.7 Electrical Characteristics – 12 V ............................... 5
7.8 Electrical Characteristics – Adjustable...................... 6
7.9 Electrical Characteristics – All Output Voltage
Versions ..................................................................... 6
7.10 Typical Characteristics ............................................ 7
7.11 Typical Characteristics – Fixed Output Voltage
Versions ..................................................................... 9
8 Parameter Measurement Information ................ 10
9 Detailed Description ............................................ 11
9.1 Overview ................................................................. 11
9.2 Functional Block Diagram ....................................... 11
9.3 Feature Description................................................. 11
9.4 Device Functional Modes........................................ 12
10 Application and Implementation........................ 13
10.1 Application Information.......................................... 13
10.2 Typical Applications .............................................. 14
11 Power Supply Recommendations ..................... 25
12 Layout................................................................... 25
12.1 Layout Guidelines ................................................. 25
12.2 Layout Examples................................................... 25
13 Device and Documentation Support ................. 27
13.1 Documentation Support ........................................ 27
13.2 Receiving Notification of Documentation Updates 27
13.3 Community Resources.......................................... 27
13.4 Trademarks ........................................................... 27
13.5 Electrostatic Discharge Caution ............................ 27
13.6 Glossary ................................................................ 27
14 Mechanical, Packaging, and Orderable
Information ........................................................... 27
14.1 DAP (WSON Package) ......................................... 27
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision K (April 2013) to Revision L
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 J (April 2013) to Revision K
Page
• Changed layout of National Data Sheet to TI format ............................................................................................................. 1
2
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Copyright © 1998–2016, Texas Instruments Incorporated



Texas Instruments LM2672N-12
www.ti.com
LM2672
SNVS136L – SEPTEMBER 1998 – REVISED JUNE 2016
5 Description (continued)
A family of standard inductors for use with the LM2672 are available from several different manufacturers. This
feature greatly simplifies the design of switch-mode power supplies using these advanced ICs. Also included in
the datasheet are selector guides for diodes and capacitors designed to work in switch-mode power supplies.
Other features include ±1.5%-tolerance on output voltage within specified input voltages and output load
conditions, and ±10% on the oscillator frequency. External shutdown is included, featuring typically 50 μA stand-
by current. The output switch includes current limiting, as well as thermal shutdown for full protection under fault
conditions.
6 Pin Configuration and Functions
D or P Package
8-Pin SOIC or PDIP
Top View
NHN Package
16-Pin WSON
Top View
CB
1
SS
2
SYNC
3
FB
4
8
VSW
7
VIN
6
GND
5
ON/OFF
Not to scale
CB
1
NC
2
NC
3
SS
4
NC
5
SYNC
6
NC
7
FB
8
DAP
16
VSW
15
VSW
14
VIN
13
NC
12
GND
11
GND
10
NC
9
ON/OFF
NAME
CB
FB
GND
NC
ON/OFF
SS
SYNC
VIN
VSW
PIN
SOIC, PDIP
1
4
6
5
2
3
7
8
WSON
1
8
11, 12
2, 3, 5,
7, 10, 13
9
4
6
14
15, 16
Not to scale
Pin Functions
I/O
DESCRIPTION
I
Boot-strap capacitor connection for high-side driver. Connect a high quality
100-nF capacitor from CB to VSW Pin.
Feedback sense input pin. Connect to the midpoint of feedback divider to set
I
VOUT for ADJ version or connect this pin directly to the output capacitor for a
fixed output version.
Power ground pins. Connect to system ground. Ground pins of CIN and COUT.
Path to CIN must be as short as possible.
No connection pins.
I
Enable input to the voltage regulator. High = ON and low = OFF. Pull this pin
high or float to enable the regulator.
I
Soft-start capacitor 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.
I
This input allows control of the switching clock frequency. If left open-circuited
the regulator is switched at the internal oscillator frequency, typically 260 kHz.
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.
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.
Copyright © 1998–2016, Texas Instruments Incorporated
Product Folder Links: LM2672
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