Voltage Regulator. LM2670T-5.0 Datasheet

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LM2670T-5.0 Datasheet
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Part LM2670T-5.0
Description High Efficiency 3-A Step-Down Voltage Regulator
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LM2670
SNVS036K – APRIL 2000 – REVISED JUNE 2016
LM2670 SIMPLE SWITCHER® High Efficiency 3-A Step-Down Voltage Regulator With Sync
1 Features
1 Efficiency Up to 94%
• Simple and Easy to Design With (Using Off-the-
Shelf External Components)
• 150-mΩ DMOS Output Switch
• 3.3-V, 5-V, 12-V Fixed Output and Adjustable
(1.2 V to 37 V) Versions
• 50-µA Standby Current When Switched OFF
• ±2% Maximum Output Tolerance Over Full Line
and Load Conditions
• Wide Input Voltage Range: 8 V to 40 V
• External Sync Clock Capability
(280 kHz to 400 kHz)
• 260-kHz Fixed Frequency Internal Oscillator
• –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
• Communications and Radio Equipment Regulator
With Synchronized Clock Frequency
3 Description
The LM2670 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 3-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
output version.
The SIMPLE SWITCHER® concept provides for a
complete design using a minimum number of external
components. The switching clock frequency can be
provided by an internal fixed frequency oscillator
(260 kHz) or from an externally provided clock in the
range of 280 kHz to 400 kHz which allows the use of
physically smaller sized components. A family of
standard inductors for use with the LM2670 are
available from several manufacturers to greatly
simplify the design process. The external sync clock
provides direct and precise control of the output ripple
frequency for consistent filtering or frequency
spectrum positioning.
The LM2670 series also has built-in thermal
shutdown, current limiting and an ON/OFF control
input that can power down the regulator to a low
50µA quiescent current standby condition. The
output voltage is ensured to a ±2% tolerance.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TO-263 (7)
10.10 mm × 8.89 mm
LM2670
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
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 LM2670T-5.0
LM2670
SNVS036K – APRIL 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 Specifications......................................................... 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 – All Output Voltage
Versions ..................................................................... 6
6.9 Typical Characteristics .............................................. 7
7 Detailed Description ............................................ 10
7.1 Overview ................................................................. 10
7.2 Functional Block Diagram ....................................... 10
7.3 Feature Description................................................. 10
7.4 Device Functional Modes........................................ 12
8 Application and Implementation ........................ 13
8.1 Application Information............................................ 13
8.2 Typical Applications ................................................ 16
9 Power Supply Recommendations...................... 26
10 Layout................................................................... 27
10.1 Layout Guidelines ................................................. 27
10.2 Layout Example .................................................... 28
11 Device and Documentation Support ................. 29
11.1 Device Support...................................................... 29
11.2 Related Documentation......................................... 29
11.3 Receiving Notification of Documentation Updates 29
11.4 Community Resources.......................................... 29
11.5 Trademarks ........................................................... 29
11.6 Electrostatic Discharge Caution ............................ 29
11.7 Glossary ................................................................ 29
12 Mechanical, Packaging, and Orderable
Information ........................................................... 29
12.1 DAP (VSON Package) .......................................... 29
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision J (April 2013) to Revision K
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 I (April 2013) to Revision J
Page
• Changed layout of National Data Sheet to TI format ........................................................................................................... 26
2
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Copyright © 2000–2016, Texas Instruments Incorporated



Texas Instruments LM2670T-5.0
www.ti.com
5 Pin Configuration and Functions
KTW Package
7-Pin TO-263
Top View
Not to scale
Thermal
Pad
LM2670
SNVS036K – APRIL 2000 – REVISED JUNE 2016
Not to scale
NDZ Package
7-Pin TO-220
Top View
7
6
5
4
3
2
1
ON/OFF
Feedback/FB
SYNC
GND
CBOOST/CB
Input
Switch_output
NHM Package
14-Pin VSON
Top View
NC 1
Input 2
Input 3
CBOOST/CB 4
NC 5
SYNC 6
Feedback/FB 7
14
13
12
DAP 11
10
9
8
Switch_output
Switch_output
Switch_output
NC
NC
GND
ON/OFF
Connect DAP to pin 9 on PCB
Not to scale
NAME
Switch output
Input
CBOOST/CB
GND
SYNC
Feedback/FB
ON/OFF
NC
Pin Functions
PIN
TO-263,
TO-220
VSON
I/O
DESCRIPTION
1
12, 13, 14
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 and input
2
2, 3
I bypass capacitors CIN. Path from VIN pin to high frequency bypass CIN and GND must
be as short as possible.
3
4
I
Boot-strap capacitor connection for high-side driver. Connect a high-quality, 100-nF
capacitor from CB to VSW Pin.
4
9
Power ground pins. Connect to system ground. Ground pins of CIN and COUT. Path to
CIN must be as short as possible.
5
6
I
Synchronization pin. Use this pin to synchronize the frequency to an external clock.
The external frequency must be higher than the LM2670 internal oscillation frequency.
Feedback sense input pin. Connect to the midpoint of feedback divider to set VOUT for
6
7
I ADJ version or connect this pin directly to the output capacitor for a fixed output
version.
7
8
I
Enable input to the voltage regulator. High = ON and low = OFF. Pull this pin high or
float to enable the regulator.
1, 5, 10, 11 — No connect pins
Copyright © 2000–2016, Texas Instruments Incorporated
Product Folder Links: LM2670
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