LM46001-Q1 Converter Datasheet

LM46001-Q1 Datasheet, PDF, Equivalent


Part Number

LM46001-Q1

Description

1-A Synchronous Step-Down Voltage Converter

Manufacture

etcTI

Total Page 30 Pages
Datasheet
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LM46001-Q1
SNVSAA3B – JULY 2015 – REVISED NOVEMBER 2017
LM46001-Q1 3.5-V to 60-V, 1 A Synchronous Step-Down Voltage Converter
1 Features
1 Qualified for Automotive Applications
• AEC-Q100 Qualified With the Following Results:
– Device Temperature Grade 1: –40°C to
+125°C Operating Junction Temperature
• 24-µA Quiescent Current in Regulation
• High Efficiency at Light Load (DCM and PFM)
• Tested to EN55022/CISPR 22 EMI Standards
• Integrated Synchronous Rectification
• Adjustable Frequency Range: 200 kHz to 2.2 MHz
(500 kHz default)
• Frequency Synchronization to External Clock
• Internal Compensation
• Stable With Almost Any Combinations of Ceramic,
Polymer, Tantalum, and Aluminum Capacitors
• Power-Good Flag
• Soft Start into Pre-Biased Load
• Internal Soft Start: 4.1 ms
• Extendable Soft-Start Time by External Capacitor
• Output Voltage Tracking Capability
• Precision Enable to Program System UVLO
• Output Short-Circuit Protection with Hiccup Mode
• Overtemperature Thermal Shutdown Protection
• Create a Custom Design Using the LM46001-Q1
With the WEBENCH® Power Designer
2 Applications
• Sub-AM Band 12 V and 24 V Automotive
• Telecommunications Systems
• Commercial Vehicle Power Supplies
• General Purpose Wide VIN Regulation
• High Efficiency Point-Of-Load Regulation
VIN
CIN
Simplified Schematic
VIN SW
LM46001-Q1
L
CBOOT
COUT
VOUT
ENABLE
PGOOD
SS/TRK
RT
SYNC
AGND
CBOOT
BIAS
FB
VCC
PGND
CBIAS
CFF
RFBT
CVCC
RFBB
3 Description
The LM46001-Q1 regulator is an easy-to-use
synchronous step-down DC-DC converter capable of
driving up to 1 A of load current from an input voltage
ranging from 3.5 V to 60 V. The LM46001-Q1
provides exceptional efficiency, output accuracy and
drop-out voltage in a very small solution size. An
extended family is available in 0.5-A and 2-A load
current options in pin-to-pin compatible packages.
Peak current mode control is employed to achieve
simple control loop compensation and cycle-by-cycle
current limiting. Optional features such as
programmable switching frequency, synchronization,
power-good flag, precision enable, internal soft start,
extendable soft start, and tracking provide a flexible
and easy-to-use platform for a wide range of
applications. Discontinuous conduction and automatic
frequency reduction at light loads improve light load
efficiency. The family requires few external
components and pin arrangement allows simple,
optimum PCB layout. Protection features include
thermal shutdown, VCC undervoltage lockout, cycle-
by-cycle current limit, and output short-circuit
protection. The LM46001-Q1 device is available in
the 16-pin HTSSOP (PWP) package (6.6 mm ×
5.1 mm × 1.2 mm) with 0.65-mm lead pitch. The
device is pin-to-pin compatible with LM4360x and
LM4600x families. The LM46001A-Q1 version is
optimized for PFM operation and recommended for
new designs.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM46001-Q1,
LM46001A-Q1
HTSSOP (16)
6.60 mm × 5.10 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
space
space
space
Radiated Emission Graph
VOUT = 3.3 V, VIN = 24 V, FS= 500 kHz, IOUT = 1 A
dBuV
80
70
60
50
40
30
20
10
30
Vertical Polarization
Horizontal Polarization
EN 55022 Class B Limit
Evaluation Board Emissions
100
Frequency (MHz)
1000
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.

LM46001-Q1
LM46001-Q1
SNVSAA3B – JULY 2015 – REVISED NOVEMBER 2017
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........................................... 5
6.6 Timing Requirements ................................................ 6
6.7 Switching Characteristics .......................................... 7
6.8 Typical Characteristics .............................................. 8
7 Detailed Description ............................................ 14
7.1 Overview ................................................................. 14
7.2 Functional Block Diagram ....................................... 14
7.3 Feature Description................................................. 15
7.4 Device Functional Modes........................................ 24
8 Applications and Implementation ...................... 25
8.1 Application Information............................................ 25
8.2 Typical Applications ................................................ 25
9 Power Supply Recommendations...................... 42
10 Layout................................................................... 42
10.1 Layout Guidelines ................................................. 42
10.2 Layout Example .................................................... 45
11 Device and Documentation Support ................. 46
11.1 Device Support...................................................... 46
11.2 Receiving Notification of Documentation Updates 46
11.3 Community Resources.......................................... 46
11.4 Trademarks ........................................................... 46
11.5 Electrostatic Discharge Caution ............................ 46
11.6 Glossary ................................................................ 46
12 Mechanical, Packaging, and Orderable
Information ........................................................... 47
4 Revision History
Changes from Revision A (August 2015) to Revision B
Page
• Added LM46001A-Q1 information on page 1; add Webench links ....................................................................................... 1
• Added RPGOOD LM46001A-Q1 ................................................................................................................................................ 6
Changes from Original (July 2015) to Revision A
Page
• Changed from Preview to Production Data ............................................................................................................................ 1
2 Submit Documentation Feedback
Product Folder Links: LM46001-Q1
Copyright © 2015–2017, Texas Instruments Incorporated


Features Product Folder Order Now Technical Doc uments Tools & Software Support & Com munity LM46001-Q1 SNVSAA3B – JULY 20 15 – REVISED NOVEMBER 2017 LM46001-Q1 3.5-V to 60-V, 1 A Synchronous Step-Do wn Voltage Converter 1 Features •1 Q ualified for Automotive Applications AEC-Q100 Qualified With the Following Results: – Device Temperature Grade 1: –40°C to +125°C Operating Juncti on Temperature • 24-µA Quiescent Cur rent in Regulation • High Efficiency at Light Load (DCM and PFM) • Tested to EN55022/CISPR 22 EMI Standards • I ntegrated Synchronous Rectification • Adjustable Frequency Range: 200 kHz to 2.2 MHz (500 kHz default) • Frequenc y Synchronization to External Clock • Internal Compensation • Stable With Almost Any Combinations of Ceramic, Pol ymer, Tantalum, and Aluminum Capacitors • Power-Good Flag • Soft Start int o Pre-Biased Load • Internal Soft Sta rt: 4.1 ms • Extendable Soft-Start Ti me by External Capacitor • Output Voltage Tracking Capability • Precision Enable to Program System UVL.
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