LM46002 Converter Datasheet

LM46002 Datasheet, PDF, Equivalent


Part Number

LM46002

Description

2-A Synchronous Step-Down Voltage Converter

Manufacture

etcTI

Total Page 30 Pages
Datasheet
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LM46002
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LM46002
SNVSA13C – APRIL 2014 – REVISED APRIL 2019
LM46002 3.5-V to 60-V, 2-A Synchronous Step-Down Voltage Converter
1 Features
1 27-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 LM46002 with
the WEBENCH® Power Designer
2 Applications
• Industrial power supplies
• Telecommunications systems
• Sub-AM band automotive
• Commercial vehicle power supplies
• General-purpose wide VIN regulation
• High-efficiency point-of-load regulation
VIN
CIN
Simplified Schematic
VIN SW
LM46002
ENABLE
PGOOD
SS/TRK
RT
SYNC
AGND
CBOOT
BIAS
FB
VCC
PGND
L
CBOOT
COUT
VOUT
CBIAS
CFF
RFBT
CVCC
RFBB
1
3 Description
The LM46002 regulator is an easy-to-use
synchronous step-down DC/DC converter capable of
driving up to 2 A of load current from an input voltage
ranging from 3.5 V to 60 V. The LM46002 provides
exceptional efficiency, output accuracy and drop-out
voltage in a very small solution size. An extended
family is available in various load current options and
36-V maximum input voltage in pin-to-pin compatible
packages, including LM46001, LM46000, LM43603,
LM43602, LM43601 and LM43600. 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. 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 LM46002 device is
available in the 16-lead HTSSOP / PWP package
(6.6 mm × 5.1 mm × 1.2 mm) with 0.65-mm lead
pitch.
PART NUMBER
LM46002
Device Information
PACKAGE
BODY SIZE
HTSSOP (16)
6.60 mm × 5.10 mm
space
space
space
space
Radiated Emission Graph
VIN = 24 V, VOUT = 3.3 V, FS= 500 kHz, IOUT = 2 A
80
Evaluation Board
70 EN 55022 Class B Limit
EN 55022 Class A Limit
60
50
40
30
20
10
0
0 200 400 600 800 1000
Frequency (MHz)
C001
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.

LM46002
LM46002
SNVSA13C – APRIL 2014 – REVISED APRIL 2019
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 ...................... 24
8.1 Application Information............................................ 24
8.2 Typical Applications ................................................ 24
9 Power Supply Recommendations...................... 40
10 Layout................................................................... 40
10.1 Layout Guidelines ................................................. 40
10.2 Layout Example .................................................... 43
11 Device and Documentation Support ................. 44
11.1 Device Support...................................................... 44
11.2 Receiving Notification of Documentation Updates 44
11.3 Community Resources.......................................... 44
11.4 Trademarks ........................................................... 44
11.5 Electrostatic Discharge Caution ............................ 44
11.6 Glossary ................................................................ 44
12 Mechanical, Packaging, and Orderable
Information ........................................................... 45
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision B (September 2014) to Revision C
Page
• Added WEBENCH links and top nav icon for TI Design; made editorial edits to align with latest documentation standard . 1
• Changed Handling Ratings to ESD Ratings ; move Storage temperature to Abs Max table................................................. 4
• Deleted "TJ = –40°C to 85°C" row from VFB ........................................................................................................................... 6
• Changed ISSC min from 1.45 µA to 1.17 µA and typ from 2.2 µA to 2 µA .............................................................................. 6
• Changed RPGOOD, VEN = 3.3 V: typ from 40 Ω to 69 Ω and max from 125 Ω to 150 Ω .......................................................... 6
• Changed RPGOOD, VEN = 0: typ from 60 Ω to 150 Ω and max from 150 Ω to 350 Ω............................................................... 6
• Changed Equation 16 to add "/ 2" ........................................................................................................................................ 28
• Added Receiving Notification of Documentation Updates and Community Resources ....................................................... 44
Changes from Revision A (April 2014) to Revision B
Page
• Changed this graph .............................................................................................................................................................. 12
• Added this equation .............................................................................................................................................................. 30
• Added this equation .............................................................................................................................................................. 30
• Changed this graph .............................................................................................................................................................. 31
• Changed this graph .............................................................................................................................................................. 35
• Changed this graph .............................................................................................................................................................. 35
• Changed this graph .............................................................................................................................................................. 36
• Changed this graph .............................................................................................................................................................. 43
Changes from Original (April 2014) to Revision A
Page
• Changed device from Product Preview to Production Data .................................................................................................. 1
2 Submit Documentation Feedback
Product Folder Links: LM46002
Copyright © 2014–2019, Texas Instruments Incorporated


Features Product Folder Order Now Technical Doc uments Tools & Software Support & Com munity Reference Design LM46002 SNVSA 13C – APRIL 2014 – REVISED APRIL 20 19 LM46002 3.5-V to 60-V, 2-A Synchrono us Step-Down Voltage Converter 1 Featu res •1 27-µA Quiescent current in re gulation • High efficiency at light l oad (DCM and PFM) • Meets EN55022/CIS PR 22 EMI standards • Integrated sync hronous rectification • Adjustable fr equency range: 200 kHz to 2.2 MHz (500 kHz default) • Frequency synchronizat ion to external clock • Internal comp ensation • Stable with almost any com bination of ceramic, polymer, tantalum, and aluminum capacitors • Power-good flag • Soft start into prebiased loa d • Internal soft start: 4.1 ms • E xtendable soft-start time by external c apacitor • Output voltage tracking ca pability • Precision enable to progra m system UVLO • Output short-circuit protection with hiccup mode • Overtem perature thermal shutdown protection • Create a custom design using the LM46002 with the WEBENCH® Po.
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