LM22677 Regulator Datasheet

LM22677 Datasheet, PDF, Equivalent


Part Number

LM22677

Description

Step-Down Voltage Regulator

Manufacture

etcTI

Total Page 26 Pages
Datasheet
Download LM22677 Datasheet


LM22677
LM22677
www.ti.com
SNVS582M – SEPTEMBER 2008 – REVISED APRIL 2013
LM22677/LM22677-Q1 42V, 5A SIMPLE SWITCHER®, Step-Down Voltage Regulator with
Features
Check for Samples: LM22677
FEATURES
1
2 Wide Input Voltage Range: 4.5V to 42V
• Internally Compensated Voltage Mode Control
• Stable with low ESR Ceramic Capacitors
• 100 mN-Channel MOSFET
• Output Voltage Options:
– ADJ (Outputs as Low as 1.285V)
– 5.0 (Output Fixed to 5V)
• ±1.5% Feedback Reference Accuracy
• 500 kHz Default Switching Frequency
• Adjustable Switching Frequency and
Synchronization
• -40°C to 125°C Operating Junction
Temperature Range
• Precision Enable Pin
• Integrated Boot-Strap Diode
• Integrated Soft-Start
• Fully WEBENCH® enabled
• LM22677-Q1 is an Automotive Grade Product
that is AEC-Q100 Grade 1 Qualified (-40°C to
+125°C Operating Junction Temperature)
PACKAGE
• PFM (Exposed Pad)
APPLICATIONS
• Industrial Control
• Telecom and Datacom Systems
• Embedded Systems
• Conversions from Standard 24V, 12V and 5V
Input Rails
DESCRIPTION
The LM22677 switching regulator provides all of the
functions necessary to implement an efficient high
voltage step-down (buck) regulator using a minimum
of external components. This easy to use regulator
incorporates a 42V N-channel MOSFET switch
capable of providing up to 5A of load current.
Excellent line and load regulation along with high
efficiency (>90%) are featured. Voltage mode control
offers short minimum on-time, allowing the widest
ratio between input and output voltages. Internal loop
compensation means that the user is free from the
tedious task of calculating the loop compensation
components. Fixed 5V output and adjustable output
voltage options are available. The default switching
frequency is set at 500 kHz allowing for small
external components and good transient response. In
addition, the frequency can be adjusted over a range
of 200 kHz to 1MHz with a single external resistor.
The internal oscillator can be synchronized to a
system clock or to the oscillator of another regulator.
A precision enable input allows simplification of
regulator control and system power sequencing. In
shutdown mode the regulator draws only 25 µA (typ.).
The LM22677 also has built in thermal shutdown, and
current limiting to protect against accidental
overloads.
The LM22677 is a member of Texas Instruments'
SIMPLE SWITCHER™ family. The SIMPLE
SWITCHER™ concept provides for an easy to use
complete design using a minimum number of external
components and the TI WEBENCH® design tool. TI's
WEBENCH® tool includes features such as external
component calculation, electrical simulation, thermal
simulation, and Build-It boards for easy design-in.
Simplified Application Schematic
VIN
VIN
FB
LM22677-ADJ BOOT
SW
RT/SYNC EN GND
VOUT
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2008–2013, Texas Instruments Incorporated

LM22677
LM22677
SNVS582M – SEPTEMBER 2008 – REVISED APRIL 2013
Connection Diagram
7 EN
6 FB
5 RT/SYNC
4 GND
3 BOOT
2 VIN
1 SW
www.ti.com
Exposed Pad
Connect to GND
Figure 1. 7-Lead Plastic PFM Package
Package Number NDR0007A
PIN DESCRIPTIONS
Pin Name
Description
Application Information
1 SW
Switch output
Switching output of regulator.
2 VIN
Input voltage
Supply input to the regulator.
3 BOOT
Bootstrap input
Provides the gate volage for the high side NFET
4
GND
Ground input to regulator; System ground pin.
system common
5 RT/SYNC Oscillator mode control input Used to control oscillator mode of regulator. See Switching Frequency Adjustment
and Synchronization section of data sheet.
6 FB
Feedback input
Feedback input to regulator.
7 EN
Enable input
Used to control regulator start-up and shutdown. See Precision Enable and UVLO
section of data sheet.
EP EP
Exposed Pad
Connect to ground. Provides thermal connection to PCB. See applications
information.
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
Absolute Maximum Ratings(1)(2)
VIN to GND
EN Pin Voltage
RT/SYNC Pin Voltage
SW to GND(3)
BOOT Pin Voltage
FB Pin Voltage
Power Dissipation
Junction Temperature
For soldering specifications, refer to the following document: www.ti.com/lit/snoa549
ESD Rating(4)
Human Body Model
Storage Temperature Range
43V
-0.5V to 6V
-0.5V to 7V
-5V to VIN
VSW + 7V
-0.5V to 7V
Internally Limited
150°C
±2 kV
-65°C to +150°C
(1) Absolute Maximum Ratings indicate limits beyond which damage to the device may occur, including inoperability and degradation of
device reliability and/or performance. Functional operation of the device and/or non-degradation at the Absolute Maximum Ratings or
other conditions beyond those indicated in the recommended Operating Ratings is not implied. The recommended Operating Ratings
indicate conditions at which the device is functional and should not be operated beyond such conditions.
(2) If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/Distributors for availability and
specifications.
(3) The absolute maximum specification of the ‘SW to GND’ applies to DC voltage. An extended negative voltage limit of -10V applies to a
pulse of up to 50 ns.
(4) ESD was applied using the human body model, a 100 pF capacitor discharged through a 1.5 kresistor into each pin.
2 Submit Documentation Feedback
Product Folder Links: LM22677
Copyright © 2008–2013, Texas Instruments Incorporated


Features LM22677 www.ti.com SNVS582M – SEPTEM BER 2008 – REVISED APRIL 2013 LM2267 7/LM22677-Q1 42V, 5A SIMPLE SWITCHER®, Step-Down Voltage Regulator with Featu res Check for Samples: LM22677 FEATURE S 1 •2 Wide Input Voltage Range: 4.5V to 42V • Internally Compensated Volt age Mode Control • Stable with low ES R Ceramic Capacitors • 100 mΩ N-Cha nnel MOSFET • Output Voltage Options: – ADJ (Outputs as Low as 1.285V) – 5.0 (Output Fixed to 5V) • ±1.5% Fe edback Reference Accuracy • 500 kHz D efault Switching Frequency • Adjustab le Switching Frequency and Synchronizat ion • -40°C to 125°C Operating Junc tion Temperature Range • Precision En able Pin • Integrated Boot-Strap Diod e • Integrated Soft-Start • Fully W EBENCH® enabled • LM22677-Q1 is an A utomotive Grade Product that is AEC-Q10 0 Grade 1 Qualified (-40°C to +125°C Operating Junction Temperature) PACKAGE • PFM (Exposed Pad) APPLICATIONS • Industrial Control • Telecom and Datacom Systems • Embedded Systems • Conversions from Standard 24V, 12V and 5V.
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