LM43603 Converter Datasheet

LM43603 Datasheet, PDF, Equivalent


Part Number

LM43603

Description

3-A Synchronous Step-Down Voltage Converter

Manufacture

etcTI

Total Page 30 Pages
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LM43603
SNVSA09D – APRIL 2014 – REVISED AUGUST 2017
LM43603 3.5-V to 36-V, 3A 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 a Pre-Biased Load
• Internal Soft-Start: 4.1 ms
• Extendable Soft-Start Time by External Capacitor
• Output Voltage Tracking Capability
• Precision Enable to a Program System UVLO
• Output Short Circuit Protection with Hiccup Mode
• Overtemperature Thermal Shutdown Protection
• Create a Custom Design Using the LM43603 with
the WEBENCH® Power Designer
2 Applications
• Industrial Power Supplies
• Telecommunications Systems
• Sub-AM Band Automotive
• General Purpose Wide VIN Regulation
• High Efficiency Point-Of-Load Regulation
space
space
Simplified Schematic
VIN
CIN
VIN SW
LM43603
ENABLE
PGOOD
SS/TRK
RT
SYNC
AGND
CBOOT
BIAS
FB
VCC
PGND
L
CBOOT
VOUT
COUT
CBIAS
CFF
RFBT
CVCC
RFBB
C001
3 Description
The LM43603 regulator is an easy-to-use
synchronous step-down DC-DC converter capable of
driving up to 3 A of load current from an input voltage
ranging from 3.5 V to 36 V (42 V abs max). The
LM43603 provides exceptional efficiency, output
accuracy and dropout voltage in a very small solution
size. An extended family is available in 0.5-A, 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 LM43603 device is available in the
HTSSOP / PWP 16 leaded package (5.1 mm × 6.6
mm × 1.2 mm) and VSON-16 package with wettable
flanks. HTSSOP package is pin-to-pin compatible
with LM43600, LM43601, LM43602, LM46000,
LM46001, LM46002. VSON-16 package is only pin-
to-pin compatible with LM43602.
Device Information
ORDER NUMBER
PACKAGE
BODY SIZE
LM43603PWP
HTSSOP (16)
5.10 mm × 6.60 mm
LM43603DSU
VSON (16)
4.10 mm × 5.10 mm
LM43603PWPEVM Radiated Emission Graph
12 VIN to 3.3 VOUT, FS = 500 kHz, IOUT = 3A
80
Evaluation Board
70 EN 55022 Class B Limit
60 EN 55022 Class A Limit
50
40
30
20
10
0
0 200 400 600 800 1000
Frequency (MHz)
C001
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.

LM43603
LM43603
SNVSA09D – APRIL 2014 – REVISED AUGUST 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 ......................... 4
6 Specifications......................................................... 5
6.1 Absolute Maximum Ratings ...................................... 5
6.2 ESD Ratings.............................................................. 5
6.3 Recommended Operating Conditions....................... 5
6.4 Thermal Information .................................................. 6
6.5 Electrical Characteristics........................................... 6
6.6 Timing Requirements ................................................ 7
6.7 Switching Characteristics .......................................... 8
6.8 Typical Characteristics .............................................. 9
7 Detailed Description ............................................ 15
7.1 Overview ................................................................. 15
7.2 Functional Block Diagram ....................................... 15
7.3 Feature Description................................................. 16
7.4 Device Functional Modes........................................ 23
8 Application and Implementation ........................ 25
8.1 Application Information............................................ 25
8.2 Typical Applications ................................................ 25
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 Documentation Support ....................................... 44
11.3 Related Links ........................................................ 44
11.4 Receiving Notification of Documentation Updates 45
11.5 Community Resources.......................................... 45
11.6 Trademarks ........................................................... 45
11.7 Electrostatic Discharge Caution ............................ 45
11.8 Glossary ................................................................ 45
12 Mechanical, Packaging, and Orderable
Information ........................................................... 45
4 Revision History
Changes from Revision C (February 2017) to Revision D
Page
• No technical changes, editorial only ...................................................................................................................................... 1
• Replace Handling Ratings with ESD Ratings per latest TI data sheet standards.................................................................. 5
Changes from Revision B (September 2014) to Revision C
Page
• Added new VSON package.................................................................................................................................................... 1
• Added New Package Drawing ............................................................................................................................................... 4
• Added New VSON Pinout....................................................................................................................................................... 4
• Changed BIAS Pin Abs Max ................................................................................................................................................. 5
• Changed PGOOD resistance values on EC Table................................................................................................................. 7
• Updating Figure 19 EN Falling Threshold ............................................................................................................................ 12
• Updating Figure 20 EN Rising Threshold............................................................................................................................. 12
• Updating Figure 21 EN Hysteresis ....................................................................................................................................... 12
Changes from Revision A (April 2014) to Revision B
Page
• Changed Figure 33 into conducted EMI Curve .................................................................................................................... 14
• Added Equation 25 ............................................................................................................................................................... 31
• Added Equation 26 ............................................................................................................................................................... 31
• Added Figure 73 to Figure 78. Application Performance Curves for VOUT = 5 V, Fs = 500 kHz. ........................................ 36
• Changed Figure 86............................................................................................................................................................... 38
• Changed Figure 87 .............................................................................................................................................................. 38
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Product Folder Links: LM43603
Copyright © 2014–2017, Texas Instruments Incorporated


Features Product Folder Order Now Technical Doc uments Tools & Software Support & Com munity LM43603 SNVSA09D – APRIL 2014 – REVISED AUGUST 2017 LM43603 3.5-V to 36-V, 3A Synchronous Step-Down Volta ge Converter 1 Features •1 27-µA Qu iescent Current in Regulation • High Efficiency at Light Load (DCM and PFM) • Meets EN55022/CISPR 22 EMI standard s • Integrated Synchronous Rectificat ion • Adjustable Frequency Range: 200 kHz to 2.2 MHz (500 kHz default) • F requency Synchronization to External Cl ock • Internal Compensation • Stabl e with Almost Any Combination of Cerami c, Polymer, Tantalum, and Aluminum Capa citors • Power-Good Flag • Soft Sta rt into a Pre-Biased Load • Internal Soft-Start: 4.1 ms • Extendable Soft- Start Time by External Capacitor • Ou tput Voltage Tracking Capability • Pr ecision Enable to a Program System UVLO • Output Short Circuit Protection wi th Hiccup Mode • Overtemperature Ther mal Shutdown Protection • Create a Custom Design Using the LM43603 with the WEBENCH® Power Designer .
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