LM46000 Converter Datasheet

LM46000 Datasheet, PDF, Equivalent


Part Number

LM46000

Description

0.5-A Synchronous Step-Down Voltage Converter

Manufacture

etcTI

Total Page 30 Pages
Datasheet
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LM46000
SNVSA45B – JUNE 2014 – REVISED MARCH 2018
LM46000 3.5-V to 60-V, 0.5-A Synchronous Step-Down Voltage Converter
1 Features
1 24-µA Quiescent Current in Regulation
• High Efficiency at Light Load (DCM and PFM)
• Meets 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 Combination of Ceramic,
Polymer, Tantalum, and Aluminum Capacitors
• Power-Good Flag
• Soft-Start into Prebiased 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 LM46000 With
the WEBENCH® Power Designer
2 Applications
• Industrial Power Supplies
• Telecommunications Systems
• Sub-AM Band 12-V and 24-V Automotive
• Commercial Vehicle Power Supplies
• General Purpose Wide VIN Regulation
• High Efficiency Point-Of-Load Regulation
Simplified Schematic
3 Description
The LM46000 regulator is an easy-to-use
synchronous step-down DC-DC converter capable of
driving up to 500 mA of load current from an input
voltage range of 3.5 V to 60 V. The LM46000
provides exceptional efficiency, output accuracy and
dropout voltage in a very small solution size. An
extended family is available in 1 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 modulation 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 LM46000 device is available in the
16-pin leaded HTSSOP (PWP) package (6.6 mm ×
5.1 mm × 1.2 mm) with 0.65-mm lead pitch. Pin-to-
pin compatible with LM46001, LM46002, LM43603,
LM43602, LM43601, and LM43600.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM46000
HTSSOP (16)
6.60 mm × 5.10 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
space
space
Radiated Emission Graph
VOUT = 3.3 V, VIN = 24 V, FS= 500 kHz, IOUT = 0.5 A
VIN
CIN
VIN SW
LM46000
ENABLE
PGOOD
SS/TRK
RT
SYNC
AGND
CBOOT
BIAS
FB
VCC
PGND
L
CBOOT
COUT
VOUT
CBIAS
CFF
RFBT
CVCC
RFBB
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.

LM46000
LM46000
SNVSA45B – JUNE 2014 – REVISED MARCH 2018
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........................................ 23
8 Applications and Implementation ...................... 25
8.1 Application Information............................................ 25
8.2 Typical Applications ................................................ 25
9 Power Supply Recommendations...................... 43
10 Layout................................................................... 43
10.1 Layout Guidelines ................................................. 43
10.2 Layout Example .................................................... 46
11 Device and Documentation Support ................. 47
11.1 Device Support...................................................... 47
11.2 Receiving Notification of Documentation Updates 47
11.3 Community Resources.......................................... 47
11.4 Trademarks ........................................................... 47
11.5 Electrostatic Discharge Caution ............................ 47
11.6 Glossary ................................................................ 47
12 Mechanical, Packaging, and Orderable
Information ........................................................... 47
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision A (July 2014) to Revision B
Page
• Added links for WEBENCH; bring to latest TI data sheet standard with editorial updates ................................................... 1
• Added TYPE column to Pin Functions .................................................................................................................................. 3
• Changed Handling Ratings to ESD Ratings .......................................................................................................................... 4
Changes from Original (June 2014) to Revision A
Page
• Changed device from Product Preview to Production Data .................................................................................................. 1
2 Submit Documentation Feedback
Product Folder Links: LM46000
Copyright © 2014–2018, Texas Instruments Incorporated


Features Product Folder Order Now Technical Doc uments Tools & Software Support & Com munity LM46000 SNVSA45B – JUNE 2014 – REVISED MARCH 2018 LM46000 3.5-V to 60-V, 0.5-A Synchronous Step-Down Volt age Converter 1 Features •1 24-µA Q uiescent Current in Regulation • High Efficiency at Light Load (DCM and PFM) • Meets EN55022/CISPR 22 EMI standar ds • Integrated Synchronous Rectifica tion • Adjustable Frequency Range: 20 0 kHz to 2.2 MHz (500 kHz default) • Frequency Synchronization to External C lock • Internal Compensation • Stab le With Almost Any Combination of Ceram ic, Polymer, Tantalum, and Aluminum Cap acitors • Power-Good Flag • Soft-St art into Prebiased Load • Internal So ft Start: 4.1 ms • Extendable Soft-St art Time by External Capacitor • Outp ut Voltage Tracking Capability • Prec ision Enable to Program System UVLO • Output Short-Circuit Protection With H iccup Mode • Overtemperature Thermal Shutdown Protection • Create a Custom Design Using the LM46000 With the WEBENCH® Power Designer 2 Ap.
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